青藏高原主要生态系统净初级生产力的估算
收稿日期: 2003-09-19
修回日期: 2003-11-20
网络出版日期: 2004-01-25
基金资助
国家自然科学基金重点项目 (40331006), 亚洲太平洋地区环境创新战略项目环境综合监侧子课题
Estimation of Net Primary Productivity in Tibetan Plateau
Received date: 2003-09-19
Revised date: 2003-11-20
Online published: 2004-01-25
Supported by
National Natural Science Foundation of China, No.40331006; Integrated Environmental Monitoring (IEM) Subproject, the Asia-Pacific Environmental Innovation Strategy Project (APEIS)
利用青藏高原贡嘎山、海北、五道梁、拉萨等4个野外台站2000~2002年的观测数据、陆地生态系统模型与2001年MODIS遥感数据相结合的方法来估算青藏高原区域的净初级生产力。结果表明：青藏高原区域的净初级生产力空间分布趋势表现出由东南向西北逐渐递减的梯度，该趋势也与水热梯度表现基本一致；整个青藏高原的净初级生产力为302.44×1012 gC yr-1，其中森林的净初级生产力最高，120.11×1012 gC yr-1，占整个高原净初级生产力的39.7％；全年中夏季 (6~8月) 的净初级生产力最高，246.7×1012 gC yr-1，约占全年总净初级生产力的80%。用实测数据验证模拟结果表明，二者非常相符。
关键词： 青藏高原；净初级生产力；遥感；生态系统
周才平,欧阳华,王勤学,渡边正孝,孙青强 . 青藏高原主要生态系统净初级生产力的估算[J]. 地理学报, 2004 , 59(1) : 74 -79 . DOI: 10.11821/xb200401009
The Tibetan Plateau is the least human-disturbed region in the world. Its outstanding topographic features and ecological characteristics give it a fame of "Natural Lab" for global change research. An improved TEM model based on MODIS satellite data and field observations data during 2000-2002 were used to estimate annual net primary productivity (NPP) in the Tibetan Plateau. A validation by using the observed NPP at different sites shows that the estimated NPP is well agreed with the measured NPP. The simulated results show that the estimated annual primary productivity of the entire Tibetan Plateau is 302.44×1012 gC yr-1, among which forest NPP takes up 39.7% of the total, though forests comprise only 9.74% of the Tibetan Plateau region; NPP accumulation for summer is 246.7×1012 gC yr-1, which is 80% of the year total.
Key words： Tibetan Plateau; net primary productivity; remote sensing; ecosystems
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