基于RS和GIS鄱阳湖湿地生态系统NPP时空分布特征研究

摘要

利用MODIS17数据研究鄱阳湖湿地净初级生产力( NPP)时空变化特征，探讨气温和水位变化对鄱阳湖湿地生态系统植被NNP时空分布特征的相关性。研究结果表明，鄱阳湖湿地生态系统NPP时空变化特征为：1)从量的角度来看，其年际变化较小，季节性变化较大；2)时空间分布上，其季节性变化较大，而变异系数高值区主要分布在枯水期的水面淹没范围内；3)主要影响因素为气温、水位，其变化具有较为显著的相关性，且受水位变化的影响大于受气温变化的影响。%Using the MODIS17 research NPP Time-space Distribution features of Poyang Lake Wet-land Ecosystem,and probe the relation of NPP ( net primary productivity) time-space Distribution features with temperature,water level changes. Preliminary results showed that:1 ) Total net primary productivity seasonal changes is larger than annual change. 2) Time-space distribution features,dry season water area are the high value area of the coefficient variation. 3)The main factors are temper-ature and water level,and the water level affect more than temperature affect,and they have a signifi-cant change in the correlation.