气候变化对土地覆被变化的 影响及其反馈模型

Model Studies of the Impacts of Climate Change on Land Cover and Its Feedback

气候变化对土地覆被变化影响及其反馈模型研究主要内容包括：中国土地覆被季相变化 的时空差异性；中国土地覆被特征参数ＮＤＶＩ年际变化与气候变化的关系；中国气候－植被判 别模型；气候－土地覆被变化的神经网络建模及土地覆被的气候预测；土地利用／土地覆被变化 （ＬＵＣＣ）对气候影响的反馈机制和ＬＵＣＣ对中国土壤碳库的可能影响；土地覆被变化对气候影 响的反馈数值实验。

It is revealed through principal component and factor analysis methods that there exist four types of seasonal patters of spatial differentiation of land corer change in China. The relationship between NDVI and seasonal and interannual precipitation and temperature change were studied for 17 typically vegetation types in China. The results show that impacts of precipitation and temperature interannual change on vegetation growth are different for regions of different vegetation types. The data of temperature and precipitation are used to predict NDVI in selected areas in China by methods of artificial neural networks and stepwise regression. The result shows that combining the two methods is helpful in improving prediction accuracy. Land cover change and climate change interaction through biophysical processes that involve the transfers of energy and water at the land surface and biophysical cycles that affect the concentrations of greenhouse gases and aerosols in the atmosphere. The impact of land cover change on the mesoscale boundary layer structure of the midlatitude semiarid area has been investigated by using a mesoscase biological meteorological model coupled with a cumulus ensemble parameterization scheme. A new China climate-vegetation model is developed, in which soil is taken as a limiting factor and elevation as an affecting factor. As a result, not only is the total precision of the model improved, but also is the precision of each vegetation type amended significantly;