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Wetlands play an important role in water conservation, environmental protection, and biodiversity conservation. Remote sensing is an economical and efficient technique for wetland monitoring which can limit disturbance in sensitive areas and support wetland conservation. In this paper, we used three phases of Thematic Mapper/Enhanced Thematic Mapper plus (TM/ETM+) remote sensing images from October 1989, October 1999, and October 2009 to study wetlands in Xingzi County. The images were segmented using the object-oriented remote sensing image interpretation software eCognition Developer 8.64, then segmented images were classified by slope, digital elevation model (DEM) data, Normalized Difference Vegetation Index (NDVI), Specific Leaf Area Vegetation Index (SLAVI), and Land and Water Masks (LWM) index to produce land type classification maps. Land use change information was obtained by analyzing the superposition of two classification maps of the wetland area from different years. The results showed that landscape patches in Xingzi County displayed fragmentation in their spatial distribution over time. Based on an index of changes in landscape patches, the fastest growing landscape type is grassland, while the fastest decreasing type is irrigated land. Dominant driving factors of changes in Xingzi County’s wetland landscape are population growth and policy changes. 相似文献
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沉湖湿地作为长江中下游平原典型湖泊湿地,1960s以来退化严重.收集1964、1975、1987、1997、1998、2007、2016、2018年8期航拍照片或遥感影像,运用遥感技术、动态度模型和转移矩阵模型分析,揭示武汉市沉湖湿地近50年退化过程及机理.结果表明,1964~2018年沉湖湿地由北向南退缩为鱼塘及耕地,总湿地面积缩小77%;湿地退化过程可分为3个阶段,1964~1975年围湖活动主导湿地湖泊向耕地退化,耕地面积以141%的年变幅扩张,1975~1997年湖泊改造工程迫使湖泊向沼泽退化,1997~2018年由湖泊退化而来的沼泽被进一步开垦为耕地或鱼塘;人口数量的增加及土地利用政策改变导致湿地生态服务功能退化,包括洪水调蓄、自净化功能衰退及生物多样性锐减,其退化模式可为长江中下游平原乃至全国湖泊湿地的退化提供类比参考. 相似文献
4.
Ruifeng Zhao Yaning Chen Huarong Zhou Yiqing Li Yibing Qian Lihua Zhang 《Environmental Geology》2009,57(2):455-464
The wetlands in the middle and lower reaches of the Tarim River are a rich area of biodiversity and natural resources in the
inland arid region of China. However, this wetland area has decreased in size during the past several decades. Water quality
and biodiversity has declined due to expanded agricultural activities since 1960s. Using remote sensing (RS), geographic information
system (GIS) and global positioning system (GPS) techniques, we investigated the dynamics, spatial patterns and fragmentation
of the wetlands in the middle and lower reaches of the Tarim River from 1980 to 2000. We found that the total area of the
wetlands was reduced by 45.8% and the density of the patches increased four times from 1980 to 1990. From 1990 to 2000, though
the total area of the wetlands slightly increased the number of the patches increased three times and the density of the patches
doubled. Based on the analyses of transition matrixes, diversity and fragmentation indexes, and spatial distribution alternation
of the wetlands, we found the landscape diversity and fragmentation indices increased while wetland dominance index decreased
dramatically. Among the wetland types, the areas of the river-channel, reservoir and pond wetlands increased while the areas
of the lake and marsh wetlands decreased continuously. 相似文献
5.
Devils Lake, a terminal lake in northeast North Dakota (USA), has experienced catastrophic flooding since 1993. From January 31, 1993, to December 31, 2014, lake level rose from 433.62 to 442.44 m, lake area expanded from 179.9 to 653.5 km2, and lake volume increased from 0.70 to 3.80 km3. More than $1 billion ($USD) has been spent in government payments to mitigate direct, primary, tangible flood damages. This paper provides a case study of the hydrological basis of the Devils Lake flood disaster. The unique geomorphic setting, paleoclimatic record, and hydroclimatic conditions of the region are summarized, and a wide range of hydroclimatic data is examined to provide a broad understanding of the physical basis of the flood disaster. The primary cause of the disaster was a transition to a sustained wetter climate that resulted in a dramatic response in basin hydrological variables in 1993. The transition from a long-term dry period to a long-term wet period caused the lake water budget to begin to change from an atmosphere-controlled water budget dominated by precipitation input to an amplifier lake water budget dominated by surface runoff input to the lake. Other important hydrological factors include a nonlinear precipitation–runoff relationship following the long-term drought, fill-spill and fill-merge hydrological behavior that is characteristic of wetland complexes, an increase in the lake area-to-basin area ratio, and the critical role of frozen soils in controlling infiltration and runoff production of spring snowmelt. Engineering works to manage lake volume through two outlets have reduced, but not entirely eliminated, future flood risk.
相似文献6.
Aaron T. David Pascale A. L. Goertler Stuart H. Munsch Brittany R. Jones Charles A. Simenstad Jason D. Toft Jeffery R. Cordell Emily R. Howe Ayesha Gray Michael P. Hannam William Matsubu Erin E. Morgan 《Estuaries and Coasts》2016,39(5):1491-1504
Compared to benthic and water-column invertebrate assemblages, considerably less is known about terrestrial arthropods inhabiting estuarine wetlands despite their importance to tidal wetland biodiversity and productivity. We also need to know more about how human modification of estuaries, including efforts to restore estuarine wetlands, affects these assemblages. To address this knowledge gap, we assembled data from multiple studies on terrestrial arthropod assemblages from 87 intertidal wetland sites in 13 estuaries along the west coast of North America. Arthropods were sampled between 1998 and 2013 with fallout traps deployed in wetlands for 1 to 3 days at a time. We describe patterns in the abundance and taxonomic composition of terrestrial arthropods and evaluate the relative ability of natural and anthropogenic factors to explain variation in abundance and composition. Arthropod abundance was highly variable. Vegetation assemblage, precipitation, and temperature best explained variation in arthropod abundance, while river discharge, latitude, and developed and agricultural land cover surrounding sampling sites were less important. Arthropod abundance rapidly achieved levels of reference wetlands after the restoration of tidal influence to leveed wetlands, regardless of surrounding land cover. However, arthropod assemblage composition was affected by the amount of developed land cover as well as restoration age. These results suggest that restoration of tidal influence to leveed wetlands can rapidly restore some components of estuarine wetland ecosystems but that recovery of other components will take longer and may depend on the extent of anthropogenic modification in the surrounding landscape. 相似文献
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Matthew S. Kornis Denise Breitburg Richard Balouskus Donna M. Bilkovic Lori A. Davias Steve Giordano Keira Heggie Anson H. Hines John M. Jacobs Thomas E. Jordan Ryan S. King Christopher J. Patrick Rochelle D. Seitz Heather Soulen Timothy E. Targett Donald E. Weller Dennis F. Whigham Jim UphoffJr 《Estuaries and Coasts》2017,40(5):1464-1486
Human alteration of land cover (e.g., urban and agricultural land use) and shoreline hardening (e.g., bulkheading and rip rap revetment) are intensifying due to increasing human populations and sea level rise. Fishes and crustaceans that are ecologically and economically valuable to coastal systems may be affected by these changes, but direct links between these stressors and faunal populations have been elusive at large spatial scales. We examined nearshore abundance patterns of 15 common taxa across gradients of urban and agricultural land cover as well as wetland and hardened shoreline in tributary subestuaries of the Chesapeake Bay and Delaware Coastal Bays. We used a comprehensive landscape-scale study design that included 587 sites in 39 subestuaries. Our analyses indicate shoreline hardening has predominantly negative effects on estuarine fauna in water directly adjacent to the hardened shoreline and at the larger system-scale as cumulative hardened shoreline increased in the subestuary. In contrast, abundances of 12 of 15 species increased with the proportion of shoreline comprised of wetlands. Abundances of several species were also significantly related to watershed cropland cover, submerged aquatic vegetation, and total nitrogen, suggesting land-use-mediated effects on prey and refuge habitat. Specifically, abundances of four bottom-oriented species were negatively related to cropland cover, which is correlated with elevated nitrogen and reduced submerged and wetland vegetation in the receiving subestuary. These empirical relationships raise important considerations for conservation and management strategies in coastal environments. 相似文献
8.
We analyse the potential impacts of sea-level rise on the management of saline coastal wetlands in the Hunter River estuary, NSW, Australia. We model two management options: leaving all floodgates open, facilitating retreat of mangrove and saltmarsh into low-lying coastal lands; and leaving floodgates closed. For both management options we modelled the potential extent of saline coastal wetland to 2100 under a low sea-level rise scenario (based on 5 % minima of SRES B1 emissions scenario) and a high sea-level rise scenario (based on 95 % maxima of SRES A1FI emissions scenario). In both instances we quantified the carbon burial benefits associated with those actions. Using a dynamic elevation model, which factored in the accretion and vertical elevation responses of mangrove and saltmarsh to rising sea levels, we projected the distribution of saline coastal wetlands, and estimated the volume of sediment and carbon burial across the estuary under each scenario. We found that the management of floodgates is the primary determinant of potential saline coastal wetland extent to 2100, with only 33 % of the potential wetland area remaining under the high sea-level rise scenario, with floodgates closed, and with a 127 % expansion of potential wetland extent with floodgates open and levees breached. Carbon burial was an additional benefit of accommodating landward retreat of wetlands, with an additional 280,000 tonnes of carbon buried under the high sea-level rise scenario with floodgates open (775,075 tonnes with floodgates open and 490,280 tonnes with floodgates closed). Nearly all of the Hunter Wetlands National Park, a Ramsar wetland, will be lost under the high sea-level rise scenario, while there is potential for expansion of the wetland area by 35 % under the low sea-level rise scenario, regardless of floodgate management. We recommend that National Parks, Reserves, Ramsar sites and other static conservation mechanisms employed to protect significant coastal wetlands must begin to employ dynamic buffers to accommodate sea-level rise change impacts, which will likely require land purchase or other agreements with private landholders. The costs of facilitating adaptation may be offset by carbon sequestration gains. 相似文献
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Ryan S. King William V. Deluca Dennis F. Whigham Peter P. Marra 《Estuaries and Coasts》2007,30(3):469-481
The invasion of North American tidal marshes byPhragmites australis, or common reed, is a large-scale ecological problem that has been primarily studied at small spatial scales. Previous local-scale
studies have provided evidence that the expansion ofPhragmites is facilitated by disturbance and increased nitrogen (N) associated with agricultural and urban-suburban (developed) land
uses along wetland-upland borders. We tested the generality of previous findings across a larger spatial scale and wider range
of environmental conditions in Chesapeake Bay, the largest estuarine ecosystem in the USA. We sampled 90 tidal wetlands nested
within 30 distinct subestuarine watersheds and examined the relationship between land use andPhragmites abundance and foliar N, an indicator of nitrogen availability. We estimated land use adjacent to wetland borders and within
subestuary watersheds and explored the importance of spatial proximity by weighting land use by its distance from the wetland
border or subestuary shoreline, respectively. Regression tree and changepoint analyses revealed thatPhragmites abundance sharply increased in almost every wetland where development adjacent to borders exceeded 15%. Where development
was <15% but natural land cover at the near the subestuary shoreline was low (<∼35%),Phragmites was abundant, suggesting that wetlands in highly modified watersheds also were susceptible to invasion, regardless of land
use adjacent to wetlands.Phragmites foliar N was markedly elevated in watersheds with >14–22% shoreline development, the same level of development that corresponded
to high levels of invasion. Our results suggest that development near wetlands is at least partially responsible for patterns
of invasion across Chesapeake Bay. Larger-scale phenomena, such as nitrogen pollution at the watershed-subestuary scale, also
may be facilitating invasion. Urbanization near coastlines appears to play an important role in the invasion success ofPhragmites in coastal wetlands of Chesapeake Bay and probably much of eastern North America. 相似文献
10.
岩溶湖泊湿地流域作为景观格局变化的热点研究区域,探讨景观格局动态变化及预测趋势,为岩溶流域生态安全研究提供科学依据。应用遥感与地理信息系统技术,结合普者黑岩溶湖泊湿地流域实际情况,分别对该地区1990、1995、2000、2005、2010、2015 年6 期遥感影像进行分类、解译,系统地获取地区景观格局状况,分析动态变化特征,并运用CA-Markov 模型对未来湿地景观格局进行模拟预测。结果表明:1990?2015年普者黑岩溶湿地流域景观格局随时间变化显著,景观破碎化程度总体呈现增加趋势,斑块数（NP）从861增加到889,景观类型的优势斑块面积在逐渐增加,而多样性指数从1.064下降到0.966;2020?2030年普者黑岩溶湿地流域建筑用地、农地和湿地景观类型面积在增加,农地和林地在减少,其中,较为突出的是建筑用地占有率由2.79%上升到2.97%,农地占有率60.12%增加到60.74%,湿地占有率6.67%上升7.02%,而林地占有率由26.70%下降到26.40%。景观格局进行预测可以发现湿地面积、建筑用地面积和农地变化幅度最大,本文相关研究和预测结果可为普者黑流域生态保护提供一定的建议和参考。 相似文献
11.
The geoindicators of land degradation such as erosion, vegetation change and wetland loss were identified in the Kashmir Himalayan region using a geospatial model. Geomatics techniques were used to generate information on landuse/landcover, NDVI, slope and the lithological formations that form inputs to map the erosion risk. The results of erosion analysis revealed that 48.27?% of the area is under very high erosion risk. The Middle Himalayan watersheds were found to be under high erosion risk compared to the Greater Himalayan watersheds. Pohru and Doodhganga watersheds of the Middle Himalayas were found to be under very high erosion risk. These two watersheds were studied in detail from 1992 to 2001 for vegetation change and wetland loss. In Pohru watershed, significant change was found in the dense forest with 10?% decrease. Wular lake, an important wetland in the Pohru watershed, has shrunk by 2.7?km2 during the last decade. The vegetation change analysis of the Doodhganga watershed revealed that there has been 9.13?% decrease in the forest, 7?% increase in built up and the largest wetland in the Doodhganga, Hokarsar, has reduced by 1.98?km2 from 1992 to 2001. Field studies showed that anthropogenic activities and chemically deficit soil (Karewa) along Pir Panjal ranges are the main factors responsible for high land degradation in the area. The assessment of these geoindicators provided valuable information for identifying causes and consequences of the land degradation and thus outlining potential hazard areas and designing remedial measures. 相似文献
12.
利用MSS、ETM+、CBERS-2、BJ-2、02C和TH1多时相卫星遥感数据,分别提取1975年、2000年、2007年和2016年皖江经济带湿地现状及变化的遥感信息,研究皖江经济带湿地遥感现状及变化规律。结果表明:皖江经济带湿地类型主要为河流湿地、湖泊湿地、沼泽湿地和人工湿地,市县级地域湿地分布不均、类型不全;1975—2016年,人工湿地面积增加,增长率为55.32%;沼泽湿地面积减少,减少率为69.97%;湖泊湿地和河流湿地面积较稳定,增长率分别为1.80%和2.06%。湿地变化分两个阶段:第一阶段(1975—2007年),湿地面积总体增加,河流湿地、湖泊湿地和沼泽湿地面积减少,人工湿地面积增加;第二阶段(2007—2016年),湿地面积总体增加,但河流湿地和湖泊湿地面积增加,沼泽湿地面积继续减少,人工湿地面积继续增加,湿地面积增减受人类活动影响较大。 相似文献
13.
Nature-based solutions are rapidly gaining interest in the face of global change and increasing flood risks. While assessments of flood risk mitigation by coastal ecosystems are mainly restricted to local scales, our study assesses the contribution of salt marshes and mangroves to nature-based storm surge mitigation in 11 large deltas around the world. We present a relatively simple GIS model that, based on globally available input data, provides an estimation of the tidal wetland’s capacity of risk mitigation at a regional scale. It shows the high potential of nature-based solutions, as tidal wetlands, to provide storm surge mitigation to more than 80% of the flood-exposed land area for 4 of the 11 deltas and to more than 70% of the flood-exposed population for 3 deltas. The magnitude of the nature-based mitigation, estimated as the length of the storm surge pathway crossing through tidal wetlands, was found to be significantly correlated to the total wetland area within a delta. This highlights the importance of conserving extensive continuous tidal wetlands as a nature-based approach to mitigate flood risks. Our analysis further reveals that deltas with limited historical wetland reclamation and therefore large remaining wetlands, such as the Mississippi, the Niger, and part of the Ganges-Brahmaputra deltas, benefit from investing in the conservation of their vast wetlands, while deltas with extensive historical wetland reclamation, such as the Yangtze and Rhine deltas, may improve the sustainability of flood protection programs by combining existing hard engineering with new nature-based solutions through restoration of former wetlands. 相似文献
14.
Saeed Ojaghi Farshid Farnood Ahmadi Hamid Ebadi Raechel Bianchetti 《Arabian Journal of Geosciences》2017,10(21):470
Lake Urmia, located in northwest Iran, contains a number of wetlands significantly affecting the environmental, social, and economic conditions of the region. The ecological condition of Lake Urmia has degraded during the past decade, due to climate change, human activities, and unsustainable management. The poor condition of the lake has also affected the surrounding wetlands. This study analyzes the land cover change of one of the wetlands in the southern part of Lake Urmia, known as Ghara-Gheshlagh wetland, in the period 1989–2015 using post-classification change detection and machine learning image classification. For this analysis, three Landsat images, acquired in 1989 (TM), 2001 (TM), and 2015 (Landsat-8), were used for the classification and change detection. Support vector machine learning algorithm, a supervised learning method, is employed, and images are classified into four main land cover classes namely “water,” ”barren,” “salty land,” and “agriculture and grassland.” Change detection was carried out for pairs of years 1989 to 2001 and 2001 until 2015. The results of this classification show that there is a sharp increase in the area of salt-saturated land as well as a decrease in the area of water resources. Overall classification accuracy obtained were high for the individual years: 1989 (91.48%), 2001 (90.63%), and 2015 (88.6%). Also, the Kappa coefficients for individual maps were high: 1989 (0.89), 2001 (0.8742), and 2015 (0.84). After that, the land cover change map of the study area is obtained between 1989 to 2001 and then 2001 to 2015. The results of this analysis suggest that more efforts should be taken to effectively manage water resources in the region and point to potential locations for focused management actions within the wetland area. 相似文献
15.
基于高分辨率卫星影像数据,利用遥感、GIS技术获取黑龙江省肇源县内自然资源与生态地质环境各因子分布现状数据,其中：耕地2 541.75 km2、林地161.88 km2、草地349.00 km2、河流128.05 km2、湖泊215.80 km2、沼泽109.17 km2、其他水域84.65 km2、建设用地191.25 km2、未利用地329.94 km2;湿地1 334.54 km2、荒漠化土地775.47 km2。利用地类覆盖率、人均占有量以及景观指数（破碎度指数、平均斑块分形指数、分形维数、多样性指数、均匀度指数）量化分析后,得出两类生态地质环境因子中湿地资源尤其是自然湿地受人类活动干扰程度较大、荒漠化土地受人类活动干扰程度较小的结论。并选取老山村等典型地区进行了多期次遥感动态监测及野外核查,揭示了松嫩低平原典型地区目前存在的湿地退化、土地荒漠化等生态地质环境问题。 相似文献
16.
Charles S. Hopkinson 《Estuaries and Coasts》1992,15(4):549-562
The effects of system closure on the dynamics of productivity and nutrient cycling are examined in four wetlands that differ in plant growth form and magnitudes and sources of water input and nutrient loading. Dynamics in relatively closed ombrotrophicCarex marsh andTaxodium swamp systems from Okefenokee Swamp are compared to those in open, rheotrophic riparian systems. The riparian systems examined includeZizaniopsis marshes along the tidal freshwater portion of the Altamaha River in Georgia and a matureTaxodium-Nyssa swamp along the Cache River in Illinois. Water budgets in the ombrotrophic systems are dominated by precipitation inputs while in the riparian wetlands they are dominated by overbank flooding. Nutrient loading to the open and closed systems differs by only two orders of magnitude, the former depending on atmospheric inputs and the latter depending on tidal and riverine inputs. Comparisons of nutrient import, export, and retention indicate that greater than 90% of inorganic nutrients are retained in the closed systems while less than 5% are retained in the open systems. Nutrient budgets for wetland vegetation, including aboveground uptake, root uptake, leaching, death, and translocation, are constructed. Strong differences in nutrient conservation within plant communities are found between marsh and forested closed systems and between open and closed systems as a whole. There is the indication that nutrients turn over more rapidly and nutrient cycles are less retentive and conservative as systems become more open and nutrient inputs increase. Nutrients turn over more rapidly in marshes with nonwoody vegetation than in swamp forests. This phenomena is partially attributable to the growth form of the vegetation as trees store vast amounts of high Canutrient ratio biomass in boles. Substituting space for time and marsh and swamp wetlands for young and mature ecosystems enables patterns of productivity and nutrient cycling for these wetlands to be compared with Odum’s (1969) predictions of ecosystem development. Patterns of ecosystem development in wetlands agree with those predicted for terrestrial systems in general, but there are many areas of contradiction. The degree of system closure appears to be a major factor controlling nutrient retention and cycling in wetland ecosystems. System closure is also likely to be important in determining the response of wetland systems to global increases in CO2 levels. 相似文献
17.
Fatma Demnati Boujéma Samraoui Farid Allache Alain Sandoz Lisa Ernoul 《Environmental Earth Sciences》2017,76(3):127
Chotts are salt lakes located in the arid regions of Northern Africa. These unique wetlands are recognized for their role in the migration and breeding of waterbirds and economic values generated from mineral extraction, agriculture and tourist activities. Despite their importance for flora and fauna biodiversity, they continue to face important threats due to human activities. This article consolidates a literature review of Algerian chotts from global to local importance. An in-depth view demonstrates the changes in land use of two large chotts in the southeastern region of Algeria: Chotts Merouane and Melghir. Land use images highlight a net expansion of agricultural lands, a decrease in grazing area around the lakes and a decrease of salt lake surface area. The local focus highlights the threats and changes of Algerian and Northern African chotts and proposes some perspectives for the future. 相似文献
18.
Land use and land cover changes are local and place specific, occurring incrementally in ways that often escape our attention. This study sought to detect changes in land cover in the Tema Metropolis of Ghana from 1990 to 2010. Multispectral Landsat Thematic Mapper data sets of 1990, 2000 and 2007 were acquired, pre-processed and enhanced. Unsupervised classification of the images was performed and six land cover classes (water, wetlands, closed vegetation, open vegetation, cropped lands, and built-up) were derived. The post-classification change detection technique was performed to derive the changes in land cover and their corresponding change matrices. Between 1990 and 2010, built-up areas expanded steadily to become the most prevalent land cover type in the metropolis, reducing vegetation cover dramatically. High population growth with its attendant rise in the demand for housing, and increasing commercial activities, were found to have influenced land cover changes over the period. 相似文献
19.
Implications of wetlands degradation for water resources management: Lessons from Nigeria 总被引：2，自引：0，他引：2
Nigeria is a country richly endowed with both coastal and inland wetlands, which altogether cover about 3% of the country's
land surface. These wetlands are of ecological, economic, socio-cultural, scientific and recreational significance. Nevertheless,
Nigeria's wetland resources are currently being threatened by certain anthropogenic and biogeophysical factors. Notable among
such factors are population pressure, rapid rate of urbanization, mining, oil and industrial waste pollution, uncontrolled
tilling for crop production, over-grazing, logging, unprecedented land reclamation, construction of dams, transportation routes
and other physical infrastructure, marine and coastal erosion, subsidence, ocean water intrusion, invasion by alien floral
and faunal species, sand storm, desertification, and droughts. The alarming rate at which the country's wetlands are vanishing
obviously portends some dire consequences. In particular, wetlands destruction is affecting water supply and water resources
management in various parts of the country. Wetlands perform some vitally important hydrological functions in the country.
For instance, apart from being quite instrumental to flood protection, wetlands equally maintain stream flow during the dry
season in the semi-arid region of northern Nigeria. Importantly, they also help in regulating surface water quality and volume,
as well as in replenishing and sustaining groundwater. There is no gainsaying, therefore, that the degradation of wetland
ecosystems in Nigeria increases the task of water resources management in the country. Thus, the country's wetland resources
need to be properly identified and mapped. Moreover, the right legislation and policy framework has to be put in place and
enforced to safeguard the remaining wetlands from the ongoing wanton destruction.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
20.
Relationships between the soil organic carbon density of surface soils and the influencing factors in differing land uses in Inner Mongolia 总被引：1，自引：0，他引：1
Binyong Li Haiping Tang Liheng Wu Qinghuan Li Chunrong Zhou 《Environmental Earth Sciences》2012,65(1):195-202
Land use patterns are changing and the environment has become more vulnerable in an agro-pastoral ecotone in Inner Mongolia.
Modeling studies can be done through studying the relationships between the soil organic carbon density (SOCD) and the influencing
factors in differing land uses such as cropland, forest and grassland. Such studies can provide the basis for predicting soil
organic carbon (SOC) stocks and using land resources efficiently. Therefore, the relationships between the SOCD of surface
soils and the influencing factors, such as soil type, slope and elevation, were selected for a study in differing land uses
of Duolun County, Inner Mongolia. The results showed that: (1) The variation in SOCD among the soil types followed the same
order in the three land uses: chernozems > meadow soils > bog soils > castanozems > gray-cinnamon soils > eolian soils. The
sensitivity of SOCD to land use change was different for the six soil types. Both the degradation of grassland and the application
of the government policy of returning forest from cropland induced the greatest variation in SOCD. (2) SOCD correlated significantly
with soil type and elevation in each land use. There was a significant correlation between SOCD and slope in the forest. (3)
Statistical models showing SOCD and the influencing factors were developed and provided the basis for predicting SOC stocks
in Duolun County, Inner Mongolia. 相似文献