江苏盐城海岸湿地景观生态系统研究   总被引：14，自引：2，他引：12  

李杨帆  朱晓东  邹欣庆  高建华 《海洋通报》2005,24(4):46-51

江苏盐城海岸湿地以其景观典犁性成为科学研究的理想区域。根据野外观测与文献资料分析及现场验证相结合的研究方法,基于区域景观格局演变规律进行景观生态分类,进而分析景观生态系统的动力因素、结构、格局、生物多样性特征等。结果表明：盐城海岸湿地景观生态系统生态多样性丰富,景观结构和格局的形成和演化是当地特定的非生物环境（气候、海洋水文和土壤等）、生物作用和人类活动等因素综合作用的结果：景观格局的显著特征是动态变迁的带状景观空间异质性,高、低对比度兼存的景观结构。  相似文献   

湖北梁子湖湿地土壤养分的分布特征和相关性分析   总被引：15，自引：0，他引：15  

熊汉锋  廖勤周  吴庆丰  王运华 《湖泊科学》2005,17(1):93-96

对湖北梁子湖农业湿地土壤有机质、N、P、K的分布特征进行了研究.结果表明,土壤表层有机质含量在24.203-56.815g/kg之间,TN、TP、TK分别为1.385-2.911g/kg、0.406-0.523g/kg和14.68-26.77g/kg.五类土壤中有机质、TN、TP、TK在水平分布上是随地形部位升高(地下水位降低)而降低,即从沼泽型→潜育型→侧渗型→潴育型→淹育型渐次降低.土壤剖面中,有机质、TN、TP、TK从表层到底层逐渐降低,仅在淹育型土壤中TK是从上向下逐渐升高.侧渗型水田由于湖水脉动漂洗作用使剖面底层的有机质、TN、TP、TK都低于其它四类土壤.土壤表层中速效N、P分布特征与TN、TP相似,但速效K的变异较大.土壤表层中有机质、TN、TP、TK之间有良好的相关性,而剖面中有机质与TN也高度相关.此外,沼泽型土壤有机质与TK及TN与TK显著相关,而淹育型土壤剖面中TP与TK显著负相关.  相似文献   

环青海湖湿地调查与遥感分类   总被引：1，自引：0，他引：1  

郝美玉  王学志  侯元生 《湿地科学与管理》2012,8(2):41-44

环青海湖湿地面积较大、类型丰富,是青海湖野生动物的重要栖息生境。利用遥感技术进行影像分类,并结合实地调查,建立环青海湖湿地资源分类系统,对该区域湿地资源的现状与分布特征进行研究。该区现有湿地4588.8352km2,以湖体为主。湿地类型有沼泽湿地、湖泊湿地和河流湿地,都为天然湿地,有河口湿地、湖滨湿地、盐碱化沼泽、季节性漫滩、沼泽、淡水湖泊、湖体(咸水湖泊)、河流8个亚类。结合环青海湖湿地的地貌特征、水文特征、植被类型以及生物状况,对青海湖典型湿地的成因和分布特点进行了详细描述,为青海湖湿地研究和保护提供依据。  相似文献   

江苏凤凰岛湿地公园主题旅游项目策划浅析     

孙化蓉  郭司成  陈昊 《湿地科学与管理》2012,8(2):9-11

湿地保护和旅游需要共存共发展。凤凰岛湿地公园旅游项目策划充分考虑湿地的自然资源、人文历史优势、农业产业现状以及独特的区位优势,将湿地公园旅游策划为三大主题群,并将保护、恢复、宣传、教育等贯穿到旅游行为当中,使得湿地旅游质朴化,实现旅游与保护融合发展。  相似文献   

青海湖典型湿地土壤重金属分布特征   总被引：4，自引：0，他引：4  

杨龙  陈克龙  曹生奎  卢宝良  武彦朋  陈亮 《湿地科学与管理》2012,8(1):30-33

重金属污染是当今土壤污染中影响面最广、危害最大的环境问题之一。对青海湖典型湿地土壤Cu、Zn、Pb、Cr、Fe、Mn 6种重金属元素的含量及分布特征进行了调查分析。结果表明:青海湖湿地土壤Cu、Zn、Pb、Cr、Fe、Mn 6种重金属元素的平均含量分别为16.34μg/g、46.82μg/g、15.65μg/g、58.49μg/g、14.57mg/g和33.08μg/g;青海湖区南北两岸典型湿地土壤重金属含量存在明显的空间差异。南北两岸样带上表层土壤Cu、Cr、Fe的含量变化均呈"W"形,Zn仅在青海湖北岸样带表现出"W"形,Mn元素含量在400m处为最低点,Pb没有表现出明显的变化特征;Cu、Zn、Pb 3种元素含量呈极显著相关,说明青海湖湿地土壤重金属污染有一定的同源性。  相似文献   

Impacts on groundwater recharge areas of megacity pumping: analysis of potential contamination of Kolkata,India, water supply     

Paulami Sahu  Holly A. Michael  Clifford I. Voss  Pradip K. Sikdar 《水文科学杂志》2013,58(6):1340-1360

Abstract

Water supply to the world’s megacities is a problem of quantity and quality that will be a priority in the coming decades. Heavy pumping of groundwater beneath these urban centres, particularly in regions with low natural topographic gradients, such as deltas and floodplains, can fundamentally alter the hydrological system. These changes affect recharge area locations, which may shift closer to the city centre than before development, thereby increasing the potential for contamination. Hydrogeological simulation analysis allows evaluation of the impact on past, present and future pumping for the region of Kolkata, India, on recharge area locations in an aquifer that supplies water to over 13 million people. Relocated recharge areas are compared with known surface contamination sources, with a focus on sustainable management of this urban groundwater resource. The study highlights the impacts of pumping on water sources for long-term development of stressed city aquifers and for future water supply in deltaic and floodplain regions of the world.

Editor D. Koutsoyiannis

Citation Sahu, P., Michael, H.A., Voss, C.I., and Sikdar, P.K., 2013. Impacts on groundwater recharge areas of megacity pumping: analysis of potential contamination of Kolkata, India, water supply. Hydrological Sciences Journal, 58 (6), 1340–1360.  相似文献   

Wetland conservation: Change and fragmentation in Trinidad’s protected areas   总被引：1，自引：0，他引：1  

Cerian Gibbes  Jane Southworth 《Geoforum》2009,40(1):91-104

Conservation efforts often neglect the importance of monitoring of protected areas, which is key to adaptively managing dynamic landscapes. In many developing countries, like Trinidad, protected areas are set aside as a result of an agreement with an international conservation organization, often resulting in inadequate planning and monitoring of the protected area. Monitoring of protected areas allows for an examination of the conservation scheme implemented and enables improved conservation decisions to be made. The research presented provides an example of the use of technology in monitoring conservation strategies in two protected wetlands, Caroni and Nariva, in Trinidad. Remote sensing and fragmentation analyses are used to quantify land cover change within these two protected wetlands. Results show that the classification of Caroni immediately identifies a shift towards anthropogenic land cover types, suggesting an increase in human activity within the park. This finding is further supported by the continuous measures used, such as decreases in mean NDVI and greenness values suggesting a decrease in the amount or health of the vegetation. While the classification of Nariva suggests a return to natural land covers, the continuous measures of land cover change indicate the opposite. Land cover change analyses are limited in Trinidad and in the Caribbean in general, partly due to satellite data availability, thus this research presents remote sensing and landscape fragmentation analyses as new tools for monitoring land cover change and conservation effectiveness in Trinidad.  相似文献   

白洋淀南支水资源及入淀水量研究     

李娜 《地下水》2009,31(6):74-78

自进入60年代以来,白洋淀入淀水量越来越少。不断减少的入淀水量已经严重影响了白洋淀的生态、社会等效益。主要是对白洋淀南支水资源量及南支入淀水量方面做了一些分析和计算,此次分析和计算主要是以水文学和水资源学的基本原理为基础,结合调查到的多年各项用水量的详实资料,应用分项调查法、泰森多边形法、典型年法、频率分析法,得出了白洋淀南支水资源量,南支入淀水量,南支水资源的状况对南支入淀水量的影响及入淀水量的变化规律。  相似文献   

Distribution of wetlands and salt lakes in the Yadong region of Tibet based on remote sensing,and their geo-climatic environmental changes     

《China Geology》2022,5(4):637-648

Based on the 16 scenes GF-1 satellite multi-spectral remote sensing images, through the adoption of data processing methods including orthorectification, geometric rectification, data fusion and image mosaic, integrated with field surveys, the remote sensing interpretation signs for the inland wetland types have been built, and the remote sensing survey of inland wetlands in Yadong region has been initiated, with six types of inland wetlands recognized in Yadong region, namely permanent rivers, seasonal rivers, lakes, salt lakes, alpine meadows, and inundated land. The spatial distribution characteristics and the spreading rules of these wetlands have also been revealed. Based on full understanding of the overall characteristics of the inland wetlands in the Yadong region, using the three phases of TM images acquired in 1989, 2003 and 2008 as well as the PMS2 data gathered by GF-1 in 2014, and the wide-range data (WFV3) gathered by GF-1 in 2020. As to the typical salt lakes, a long- time salt lakes transition study was carried out. The results show that the typical salt lakes in Yadong have been shrinking in the past three decades. The average annual shrinkage of Duoqing Co (Co means lake in Tibetan) was stronger than that of Gala Co, which are respective 87.30 hectares (usually short as ha; 1 ha equals to 0.01 km²) /a and 24.20 ha/a; the shrinkage degree of Gala Co was higher than that of Duoqing Co, shrank by 59.27% and 35.73% respectively. Based on the remote sensing survey results and an integrated analysis of the predecessors’ researchers, the reason for the shrinkage of the salt lakes is more inclined to geological factors. Geological process is manifested by a series of extensional faults at the bottom of the lake basin generated from tectonic activities, providing fluid infiltration channels, and inducing the eventual leakage of lake water to the lower strata. The result provides an important instance for understanding the evolution characteristics of wetlands and salt lakes in specific environment of the Tibetan Plateau.©2022 China Geology Editorial Office.  相似文献   

山东省湿地类型及湿地环境地质问题分析   总被引：2，自引：0，他引：2  

吕宝平  贾德旺  田文新  谭肖波  姜福红 《山东国土资源》2008,24(4):44-47

山东省湿地资源丰富，可分为自然湿地和人工湿地2类，自然湿地包括湖泊、海岸、沼泽、河口湾湿地，人工湿地主要为水稻田、水库、池塘湿地等，湿地面积约为1．71万km^2。该文分析研究了山东省的湿地环境地质问题，并提出了工程措施和非工程措施2种防治措施。  相似文献