作　　者： ; ; ; (刘敏超）;

机构地区： 中山大学环境科学与工程学院

出　　处： 《环境科学学报》 2005年第9期1280-1286,共7页

摘　　要： 在地理信息系统的支持下,将相关地图数字化并利用已有的地形数据库等资料,研究了三江源地区生态系统土壤保持、涵养水源、固定CO2和释放O2等4项生态功能,并利用市场价值法、机会成本法和影子工程法等评估了其生态功能的价值.研究结果表明:三江源地区生态系统土壤保持总量为1.0383×109t·a-1,其价值总计为1.2528×109元·a-1;植被凋落物和土壤涵养水源能力为1.6469×1010t·a-1,涵养水源能力价值为1.1034×1010元·a-1;生态系统固定CO2为1.4128×108t·a-1,价值为1.0053×1010～4.7798×1010元·a-1;释放O2为1.0401×108t·a-1,价值为3.6709×1010～4.1605×1010元·a-1;4项生态功能合计总价值为5.9049×1010～1.0169×1011元·a-1.由此可见,三江源地区生态系统生态功能价值巨大,保护其生态系统结构和功能对我国江河中下游地区和东南亚国家生态环境安全和区域可持续发展具有重大意义. Services function of ecosystem in Sanjiangyuan region, including soil conservation, water-holding, carbon dioxide fixation and oxygen production, were analyzed with geographic information system （GIS）, and its ecological functions were assessed with methods of market valuation, opportunity cost and shadow engineering. The results indicated that the quantity of soil conservation, water-holding, carbon dioxide fixation and oxygen production were 1 038.3 million, 16 469 million, 141.28 million, 104.01 million t·a^-1 , respectively; their economic values were 1 252.8 million, 11 034 million, 10 053-47798 million, 36 709-41 605 million yuanRMB·a^-1 , respectively; the total ecological value of ecosystem was 59 049-101 690 million yuanRMB·a^-1 . The ecological functions and value were huge in Sanjiangyuan region, and it was very important to protect the structure and functions of its ecosystem for environment safety and sustainable development for the middle and lower reaches of rivers originating from Sanjiangyuan region.

关 键 词： 三江源地区 生态功能 价值评估 空间分析

领　　域： [环境科学与工程]