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1.
HAN Hui-qing LIU Yue GAO Hong-juan ZHANG Ying-jia WANG Zhe CHEN Xiao-qiao 《山地科学学报》2020,17(5):1221-1234
Under the influence of various natural and human factors, the relationship between the ecosystem services provided for human beings by a karst ecosystem is becoming increasingly complex, profoundly limiting the effective and sustainable development of the social economy and ecosystem protection in karst areas. Taking Guizhou, China as an example, which includes both karst(including five different landforms) and non-karst area, the study explored and compared the tradeoff and synergy between ecosystem services in both terrain types. The results showed higher change rates of water yield and soil retention in karst areas than those in non-karst areas, with only small differences in the carbon storage and crop production change. The ecosystem service relationships in the karst area from 1995 to 2005 were consistent with the relationships in the non-karst area. However, differences were observed in most of these relationships from 2005 to 2015. The relationships between ecosystem services in different karst landforms from 1995 to 2005 remained the same, but there are differences found in the relationships of ecosystem services from 2005 to 2015. The trade-off and synergistic relationships between ecosystem services in the different landforms were closely related to the changes of climate and land use, particularly related to rainfall, rainfall erosivity, farmland, and forestland. 相似文献
2.
本文选取环长株潭城市群为研究区域,以Landsat TM影像解译后的土地利用数据、MODIS影像计算的植被指数,以及人口、经济和气候数据等为数据源,基于“压力-状态-响应”框架模型构建湿地生态安全评价指标体系对该区域2000-2010年湿地生态安全进行综合评价。结果表明：（1）环长株潭城市群2000、2005、2010年湿地生态安全指数均值分别为0.7268、0.7151和0.7196,湿地生态安全状态“良好”,生态安全等级程度为“较安全”。（2）环长株潭城市群区域差异性明显,一级湿地生态安全区主要分布在洞庭湖周边,二级湿地生态安全区沿主要河流分布,三级湿地生态安全区主要分布在2个或3个城市之间的交界区域。（3)研究期间环长株潭城市群湿地面积变化明显,该区域湿地总面积逐年减少;森林沼泽、草本沼泽、湖泊、河流、水田的斑块分维数均呈增加趋势;水库/坑塘、河流破碎度指数明显高于其他景观类型,湿地生态系统服务价值总体减少。在此基础上,从土地利用变化与转型、湿地景观结构与功能、自然因素等方面对影响该区域湿地生态安全的主要驱动因子进行了分析。结果表明,人类社会经济活动直接作用于湿地生态环境,通过改变区域景观和土地利用结构使湿地面积发生变化,直接影响湿地生态安全。气温、降水等气候因素通过改变水热状况和植被覆盖,间接影响湿地生态安全。针对该区域湿地生态安全存在的问题,建议在发展过程中正确处理好经济与生态环境之间的关系,尽可能减少人类活动对湿地生态环境的干扰。 相似文献
3.
西藏自治区特殊的高寒生态系统对人类活动具有高度敏感性,定量评估系列政策实施下西藏生态系统调节服务对人类活动强度变化的响应有助于西藏生态政策和空间规划的调整完善。本研究基于西藏1980年和2015年土地利用现状数据及1992—2013年DMSP/OLS夜间灯光指数数据,借助GIS空间分析功能分析了居民点用地和夜间灯光强度的变化;并结合生态系统调节服务空间数据,利用相关分析对居民点用地和夜间灯光变化所反映的人类活动强度变化对西藏生态系统水土保持和防风固沙服务的影响进行研究。结果表明：① 1980—2015年,西藏新增居民点用地212.06 km2,减少居民点用地44.99 km2,其中,新增居民点用地中62%为城镇用地,减少的居民点用地中95.88%为农村居民点;居民点用地变化主要发生在藏南河谷区;② 自治区内居民点用地扩张一定程度上直接导致夜间灯光强度增加,“一江两河”流域土地整治工程和农牧民安居工程等促进了当地人类活动强度增加,区内部分乡镇因进城务工和易地扶贫搬迁造成了当地人类活动强度的下降;③ 西藏2015年防风固沙服务较1990年有整体增强趋势,水土保持服务除藏东高山峡谷区外均有大幅度退化趋势;④ 对居民点用地进行的还林、还草整治工程等人类活动有利于促进生态系统防风固沙服务的恢复;人类活动强度的增加极易导致水土保持服务的退化,“一江两河”流域体现最为明显。研究能为西藏国土空间规划和生态政策的制定和调整提供参考。 相似文献
4.
Trade-offs and Synergies of Ecosystem Services in Karst Area of China Driven by Grain-for-Green Program 总被引：1，自引：0，他引：1
WANG Xiaofeng ZHANG Xinrong FENG Xiaoming LIU Shirong YIN Lichang CHEN Yongzhe 《中国地理科学(英文版)》2020,(1):101-114
As an important means regulating the relationship between human and natural ecosystem,ecological restoration program plays a key role in restoring ecosystem functions.The Grain-for-Green Program(GFGP,One of the world’s most ambitious ecosystem conservation set-aside programs aims to transfer farmland on steep slopes to forestland or grassland to increase vegetation coverage)has been widely implemented from 1999 to 2015 and exerted significant influence on land use and ecosystem services(ESs).In this study,three ecological models(In VEST,RUSLE,and CASA)were used to accurately calculate the three key types of ESs,water yield(WY),soil conservation(SC),and net primary production(NPP)in Karst area of southwestern China from 1982 to 2015.The impact of GFGP on ESs and trade-offs was analyzed.It provides practical guidance in carrying out ecological regulation in Karst area of China under global climate change.Results showed that ESs and trade-offs had changed dramatically driven by GFGP.In detail,temporally,SC and NPP exhibited an increasing trend,while WY exhibited a decreasing trend.Spatially,SC basically decreased from west to east;NPP basically increased from north to south;WY basically increased from west to east;NPP and SC,SC and WY developed in the direction of trade-offs driven by the GFGP,while NPP and WY developed in the direction of synergy.Therefore,future ecosystem management and restoration policy-making should consider trade-offs of ESs so as to achieve sustainable provision of ESs. 相似文献
5.
本文以济南市泉水补给区为研究对象,利用GIS空间分析方法,在其景观变化分析的基础上,参照中国陆地生态系统的生态服务价值系数,估算了泉水补给区生态服务功能价值变化,重点分析景观变化对研究区生态服务功能的影响,进而为区域可持续发展和城市建设提供理论支持。结果表明:(1)20世纪90年代以来,泉水补给区耕地和草地景观面积呈减少趋势,林地、园地和建设用地景观面积大幅增加,其中,以林地面积增加最大;从景观类型转化看,耕地与其他景观类型相互转化较为密切,特别是与建设用地和园地之间的转化;林地面积的增加主要来源于草地和耕地;(2)泉水补给区生态服务功能价值主要由林地和耕地景观生态服务价值构成,其变化对该研究区生态服务价值变化起决定作用;从生态服务价值构成类型来看,该地区土壤形成与保护服务功能单项价值所占比重最大,约占总服务功能价值的20%;(3)90年代以来,该地区总生态服务价值呈增加趋势;从单项服务价值变化来看,水源涵养、废物处理和食物生产服务功能价值则呈现出减小趋势,其中,以水源涵养减幅最大,为4.01%,主要是由该区建设用地增加,地面硬化面积增多而引起的。研究认为,济南市南部山区作为重要的泉水补给区,其生态服务功能尤为重要,特别是水源涵养功能,因此,研究区水源涵养服务功能价值的降低应在今后南部山区开发过程中得到足够的重视与保护,逐步增加泉水补给区的整体生态效益。 相似文献
6.
Meina Li Ping Yin Xiaoyong Duan Jinqing Liu Jiandong Qiu Van Phach Phung 《中国海洋大学学报(英文版)》2018,17(6):1361-1368
We analyzed the characteristics and trends of land-use change in and near the coastal zone of the Yangtze River Delta (YRD) during five periods (1995, 2000 2005, 2010, and 2015) using remotely sensed Landsat imagery. Using automatic supervised classification combined with visual interpretation, we obtained land-use information for five study areas (Nantong, Shanghai, Jiaxing, Ningbo, and Zhoushan). Significant land-use changes have occurred in this area between 1995 and 2015, characterized in particular by large reductions in cultivated land and rapid increases in urbanized land. In addition, land reclamation was very active in this period as an effective supplement to the increased demand for land development: since 1995, 1622 km2 of land was reclaimed from near-coastal regions in the study area. This increase in urbanization was jointly driven by population, economic, transportation, and policy factors. Urban areas expanded from the center outward in concentric rings, with infrastructure guiding the radial expansion of development along transportation corridors, thus forming a network of connections. Due to the influence of national land regulation policies, the expansion rate of development in the YRD gradually diminished after 2010. This indicates that the area’s resource and environmental carrying capacity has reached a saturation stage in which urbanization has transitioned from broad and incremental expansion to the intensive use of land resources. 相似文献
7.
近几十年,内蒙古地区实施了诸多生态修复与保育工程。为了评估这些工程的实施成效,本文以土地利用/覆被变化(LUCC)为切入点,借助价值存量、价值增量、价值空间强度等参量,在全区和盟市尺度上,估算并分析了内蒙古地区陆地生态系统服务功能价值变化的时空特征及驱动因素。研究结果表明：(1)2000年以来,全区价值存量小幅度增加了0.24%,但价值增量的减少速度加快了32.9%,且中东部的变化大于西部;(2)在经济发展和人口增长的双重压力下,中东部平原耕作区、森林保育区深受国家宏观政策的影响,2000年后生态系统服务功能价值存量分别增加了4.52%、4.23%,价值增量分别增加了5.91亿元、8.88亿元;中西部山区草原荒漠化治理区受制于降水不显著的波动减少态势,2000年后生态系统服务功能价值存量增加了3.51%,但价值增量减少了4.22亿元;(3)2000年以来,中东部地区人类活动正向胁迫的影响力,由前期的45.8%增强到后期的76%,但中西部地区仍然面临着艰巨的生态治理压力。研究结果为科学合理划分生态功能区、规划实施生态修复与保育工程、建立生态补偿机制提供了参照。 相似文献
8.
Simulation of land-use scenarios for Beijing using CLUE-S and Markov composite models 总被引：3，自引：0，他引：3
This study investigated and simulated land use patterns in Beijing for the year 2000 and the year 2005 from the actual land use data for the year 1995 and the year 2000,respectively,by combining spatial land allocation simulation using the CLUE-S model,and numerical land demand prediction using the Markov model.The simulations for 2000 and 2005 were confirmed to be generally accurate using Kappa indices.Then the land-use scenarios for Beijing in 2015 were simulated assuming two modes of development:1) urban development following existing trends;and 2) under a strict farmland control.The simulations suggested that under either mode,urbanized areas would expand at the expense of land for other uses.This expansion was predicted to dominate the land-use conversions between 2005 and 2015,and was expected to be accompanied by an extensive loss of farmland.The key susceptible to land-use changes were found to be located at the central urban Beijing and the surrounding regions including Yanqing County,Changping District and Fangshan District.Also,the simulations predicted a considerable expansion of urban/suburban areas in the mountainous regions of Beijing,suggesting a need for priority monitoring and protection. 相似文献
9.
黄土高原生态退耕的时空分异特征 总被引：1，自引：0，他引：1
生态退耕是调整陆地生态系统结构与功能以应对土地利用过度干扰的重要途径之一,因此科学掌握退耕格局与耕地格局演变对黄土高原生态环境治理与生态修复具有深远意义。本文以位于黄土高原的延安市为典型区,从生态退耕的整体特征、地形因素及区域差异等角度,探究生态退耕以来其耕地变化及退耕状况的空间分异特征。结果表明：生态退耕致使延安市耕地面积由2000年的11 752.80 km2减少为2013年的9149.93 km2,退耕面积为2756.85 km2,退耕指数为22.15%,且退耕耕地主要转化为林地、草地,占退耕面积的95.29%;耕地与退耕面积主要分布于6~15°、15~25°坡度及第II级（925~1115 m）、第III级（1115~1275 m）,且2005-2013年的生态退耕速率均高于2000-2005年的生态退耕速率;县域退耕面积及退耕程度均呈现由北向南依次递减的分异特征,而退耕重心与耕地重心均在延安市几何中心以北的安塞县与宝塔区边界,且生态退耕的重心由东北向西南方向迁移,耕地重心则由北向南迁移。本文通过对延安市生态退耕的时空分异特征分析可为黄土高原更加科学合理地推进生态保育与生态文明建设提供参考。 相似文献
10.
青藏高原城乡建设用地和生态用地转移时空格局 总被引：1，自引：0，他引：1
青藏高原作为中国重要的生态环境保护地,城镇化和生态环境的变化受到广泛关注。本文基于1990-2015年土地利用数据,进行生态用地和城乡建设用地之间的转移分析,通过核密度以及标准差椭圆分析进行空间转移强度的定性研究。结果表明：① 1990-2015年青藏高原生态用地显著地向城乡建设用地转移,是城乡建设用地向生态用地转移量的54.6倍,其中2000-2005年和2010-2015年是用地转移的热点时期;② 城乡建设用地与生态用地之间的转换在空间上呈现逆向状态,生态用地向城乡建设用地的转移分布逐渐从青藏高原的周边区域向腹地蔓延;城乡建设用地向生态用地的转移最初出现在青藏高原的腹地,逐渐向外围扩张;③ 生态服务功能越大的生态用地,越容易被人类占用,随之发生用地类型的转移,侵占后的土地很难反向转移为具有高生态服务功能的生态用地。 相似文献
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Owing to the joint effects of ecosystem fragility,anthropogenic disturbance and climate change,alpine grasslands(alpine meadow,alpine steppe and alpine desert)have experienced serious degradation during the past several decades.Grasslands degradation has severely affected the delivery of ecosystem multifunctionality(EMF)and services,and then threatens the livelihood of local herdsmen and ecological security of China.However,we still lack comprehensive insights about the effects of degradation and climatic factors on EMF of alpine grasslands,especially for alpine desert ecosystem.Therefore,we applied a large-scale field investigation to answer this question.Our results suggested grassland degradation significantly decreased the belowground ecosystem multifunctionality(BEMF)and EMF of alpine grasslands and aboveground ecosystem multifunctionality(AEMF)of alpine meadow,while did not reduce the AEMF of alpine steppe and desert.Except for the insignificant difference between degraded steppe and degraded desert in AEMF,the alpine meadow showed the highest AEMF,BEMF and EMF,alpine steppe ranked the second and alpine desert was the lowest.AEMF,BEMF and EMF of health alpine grasslands were strongly affected by mean annual precipitation(MAP)(19%-51%)and mean annual temperature(MAT)(9%-36%),while those of degraded meadow and degraded desert were not impacted by precipitation and temperature.AEMF and BEMF showed a synergistic relationship in healthy alpine grasslands(12%-28%),but not in degraded grasslands.Our findings emphasized the urgency of implementing the feasible ecological restoration project to mitigate the negative influences of grassland degradation on EMF of alpine ecosystems. 相似文献
12.
本文基于张家界市土地利用/土地覆盖变化,通过改进的生态系统服务价值与生态足迹的方法,测算了研究区域的生态补偿额度。研究表明:(1)从2001~2013年张家界市各县(区)生态系统服务价值变化率来看,永定区呈下降态势;增幅最大的是武陵源区,其次是桑植县,慈利县增幅最小。(2)2013年张家界市的人均生态足迹为1.3625 hm~2,而实际生态承载力为0.9556 hm~2,人均可利用生态承载力为0.8409 hm~2,则人均生态赤字为-0.5215 hm~2。(3)计算出了张家界市各县(区)的生态补偿标准,其中慈利县需要支付的生态补偿量最高,为18.61亿元;其次是永定区,为10.49亿元;再次是武陵源区,为582.12万元;最小的是桑植县,为359.70万元。评价结果将促进张家界市生态环境保护和经济社会的可持续发展。 相似文献
13.
塔里木河下游地区是我国西部干旱区生态环境问题比较突出的区域。本文主要从地表水(湖泊、河流和湿地)、地下水、地表植被覆盖的角度,基于多源遥感和长时间序列数据,监测和分析生态输水前后区域环境变化和生态响应。首先,采用基于知识迁移的专题图斑更新技术,实现了1990、1995、2000、2005、2010和2015年区域湿地遥感制图和植被覆盖度等生态因子指标提取;然后,以2000年为基准（生态输水起始年）,结合地下水位观测数据,对比分析了人工生态输水前后区域生态环境动态变化过程。结果显示：① 生态输水前（1990-2000年）,塔河下游的生态环境持续恶化,流域范围内一半以上的沼泽湿地消失、河道干涸,地下水位下降,区域植被覆盖大幅度下降;② 生态输水后（2000-2017年）,区域生态环境明显好转,改变了下游河道长期断流状态,区域地下水位明显抬升,地表水域（湖泊和沼泽）面积呈现“V”型逆转增加,区域植被覆盖区和覆盖度均呈现显著增加趋势,曾经一度干涸的塔河尾闾台特玛湖水域面积2017年8月达到147.87 km2。以上研究结果综合表明人工生态输水工程对塔河下游生态环境拯救和治理发挥了重要作用,遏制了生态输水前塔河下游生态环境继续恶化局面,流域生态环境正在逐步恢复。 相似文献
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《中国地理科学(英文版)》2021,(5)
Rapid urbanization leads to dramatic changes in land use patterns, and the land use/cover change(LUCC) can reflect the spatial impact of urbanization on the ecological environment. Simulating the process of LUCC and predicting the ecological risk future changes can provide supports for urban ecological management. Taking the Yangtze River Delta Urban Agglomeration(YRDUA),China as the study area, four developmental scenarios were set on the basis of the land use data from 2005 to 2015. The temporal land use changes were predicted by the integration of the system dynamic and the future land use simulation(SD-FLUS) model, and the geographically weighted regression(GWR) model was used to identify the spatial heterogeneity and evolution characteristics between ecological risk index(ERI) and socio-economic driving forces. Results showed that: 1) From 2005 to 2015, the expansion of construction land(7670.24 km~2) mainly came from the occupation of cultivated land(7854.22 km~2). The Kappa coefficient of the SD-FLUS model was 0.886, indicating that this model could be used to predict the future land use changes in the YRDUA. 2) Gross domestic production(GDP) and population density(POP) showed a positive effect on the ERI, and the impact of POP exceeded that of GDP. The ERI showed the characteristics of zonal diffusion and a slight upward trend, and the high ecological risk region increased by 6.09%, with the largest increase. 3) Under different developmental scenarios, the land use and ecological risk patterns varied. The construction land is increased by 5.76%, 7.41%, 5.25% and 6.06%, respectively. And the high ecological risk region accounted for 12.71%, 15.06%, 11.89%,and 12.94%, correspondingly. In Scenario D, the structure of land use and ecological risk pattern was better compared with other scenarios considering the needs of rapid economic and ecological protection. This study is helpful to understand the spatio-temporal pattern and demand of land use types, grasp the ecological security pattern of large-scale areas, and provide scientific basis for the territory development of urban agglomeration in the future. 相似文献
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16.
Hengxing Xiang Mingming Jia Zongming Wang Lin Li Dehua Mao Da Zhang Guishan Cui Weihong Zhu 《中国地理科学(英文版)》2018,28(6):973-985
Understanding the effects of land cover changes on ecosystem carbon stocks is essential for ecosystem management and environmental protection, particularly in the transboundary region that has undergone marked changes. This study aimed to examine the impacts of land cover changes on ecosystem carbon stocks in the transboundary Tumen River Basin (TTRB). We extracted the spatial information from Landsat Thematic Imager (TM) and Operational Land Imager (OLI) images for the years 1990 and 2015 and obtained convincing estimates of terrestrial biomass and soil carbon stocks with the InVEST model. The results showed that forestland, cropland and built-up land increased by 57.5, 429.7 and 128.9 km2, respectively, while grassland, wetland and barren land declined by 24.9, 548.0 and 43.0 km2, respectively in the TTRB from 1990 to 2015. The total carbon stocks encompassing aboveground, belowground, soil and litter layer carbon storage pools have declined from 831.48 Tg C in 1990 to 831.42 Tg C in 2015 due to land cover changes. In detail, the carbon stocks decreased by 3.13 Tg C and 0.44 Tg C in Democratic People’s Republic of Korea (North Korea) and Russia, respectively, while increased by 3.51 Tg C in China. Furthermore, economic development, and national policy accounted for most land cover changes in the TTRB. Our results imply that effective wetland and forestland protection policies among China, North Korea, and Russia are much needed for protecting the natural resources, promoting local ecosystem services and regional sustainable development in the transnational area. 相似文献
17.
宁波市城市土地利用绩效评价及障碍因子分析 总被引：1，自引：0，他引：1
宁波市从2005年起围绕城市发展制定并开展了一系列"城中村改造"项目,积极完善城市土地利用模式,推动城市化进程。为探究这一时段宁波市城市土地利用绩效的变化,采用TOPSIS评价方法对城市土地利用绩效进行综合评价计算,并利用障碍度模型对宁波市城市土地利用绩效进行深入分析,指出日后城市土地利用重点。结果表明:①宁波市城市土地利用绩效指数逐步从0.059增长到1.000,绩效水平从"低级"达到"优质";②准则层指标障碍度不断变化,其中变化最大的为生态可持续,在2015年时降为0;③指标层障碍因子诊断结果说明地均从业人数等指标在持续、深层次地影响城市土地利用。 相似文献
18.
退耕还林（草）等生态工程对区域用地结构及生态系统服务功能产生了重要影响。本研究基于RUSLE模型,并辅以遥感监测与GIS空间分析方法,对北方农牧交错带西段2000-2015年退耕状况及其引起的土壤保持功能变化分3个时段（2000-2005年、2005-2010年及2010-2015年）进行了探究。结果表明：北方农牧交错带西段地区2000-2015年耕地面积净减少1663.83 km2,以转为林地、草地、建设用地为主,其中耕地转林、草地净减少面积为1113.64 km2,草地和未利用地是新增耕地的主要来源;15年间土壤保持功能提升显著,退耕还林（草）工程的实施使土壤保持量增加了56.50×104 t,2005-2010年由退耕所带来的土壤保持增加量在3段时期中最高;不同坡度等级的生态退耕引起的土壤保持增加量差别较大,总体随着坡度升高呈下降趋势,但在25°以上的陡坡耕地由退耕还林（草）带来的土壤保持效益又有所升高。研究对于评估北方农牧交错带西段地区实施退耕还林（草）等工程的生态效益具有重要意义,并能为区域生态保护与修复工程的建设规划提供科学依据。 相似文献
19.
基于青岛市区2005年4月和2015年4月的TM影像,利用ENVI中监督分类法,结合人工目视解译,得出2005年和2015年青岛市区土地利用类型分布情况。利用土地利用类型动态模型,分析了10年间青岛市土地利用类型的变化规律。认为2005—2015年,青岛市土地利用类型产生了较大的变化,建设用地、耕地、水面、草地、林地的面积变化显著。其中,建设用地面积增加200.98 km~2;耕地面积减少105.89 km~2;水面面积减少76.68 km~2;草地面积减少69.53 km~2;林地面积增加54.45 km~2;未利用土地面积减少。说明青岛市区处于土地利用发展的时期,政府应该注重土地资源的合理利用。 相似文献
20.
六盘水市土壤侵蚀时空特征及影响因素分析 总被引：1，自引：0，他引：1
六盘水市是我国生态地位极其重要,水土流失又较为严重的城市。近些年,六盘水市实施了一系列生态工程,为了定量分析六盘水市土壤侵蚀状况及其影响因素,本文基于RUSLE模型,利用降雨数据、遥感影像数据、土地利用数据等,对贵州省六盘水市1990-2015年土壤侵蚀模数和土壤侵蚀量进行定量模拟,分析其时空动态变化,利用地理探测器定量分析影响因素,并进行空间相关性分析,结果表明： ① 六盘水市土壤侵蚀以微度和中度侵蚀为主。土壤侵蚀严重地区主要分布在北盘江流域与南盘江流域交界处以及喀斯特山地地区,煤矿开采使植被覆盖等抑制土壤侵蚀因子减少作用,使局部地区土壤侵蚀程度加剧。② 1990-2010年平均土壤侵蚀模数整体为下降趋势,2010-2015年为上升趋势。其中2000年平均土壤侵蚀模数最大,2010年平均土壤侵蚀模数最小。该变化由降雨可蚀性因子和植被覆盖度因子综合影响所致。③ 植被覆盖度因子和多年平均降雨量因子是影响区域土壤侵蚀空间分布的重要因素。未利用土地、植被覆盖度小于0.3、坡度在25°以上和降雨量在1543~1593 mm之间的地区为高风险侵蚀区域。④ 植被覆盖度与土壤侵蚀在空间上全部呈负相关性,降雨因子与土壤侵蚀在空间上存在负相关性和正相关性。⑤ 土壤侵蚀改善区域大多分布在生态工程区域内,生态工程建设能够改善土壤侵蚀情况,不同生态工程保护侧重点不同导致土壤侵蚀改善程度不同。退耕还林还草工程对六盘水市土壤侵蚀的改善具有重要意义,六盘水市更宜退耕还林。 相似文献