1981—2000年内蒙古中部地区植被净初级生产量变化研究

Study on Net Primary Production Variations in the Central Part of Inner-Mongolia during 1981-2000

基于AVHRR GLOPEM NPP数据集及相应时段的气候数据集,通过对逐个像元信息的提取与分析,研究了1981—2000年内蒙古中部地区植被净初级生产量退化的状况及其与气候变化的相关性。结果显示:1)该区植被净初级生产量的空间分布大致由东向西呈减少的趋势,年际变化比较明显,尤其是在1990—2000年,减少率达10.32 gC/m2.a;2)1981—2000年,植被净初级生产量年际变化的区域差异比较明显;3)植被净初级生产量年际变化与气候因子年际变化的相关性存在比较明显的区域差异;4)不同植被类型对气候变化表现出不同的响应特征,该区降水量年际变化对植被的影响要高于气温年际变化对其的影响。本研究有助于了解内蒙古中部地区植被净初级生产量退化的状况以及影响其退化的气候因素,可为退化植被的生态修复提供有意义的参考。

Based on AVHRR GLOPEM NPP dataset and climate data in the corresponding period, the authors analyzed the situation of the net primary production degradation in the central part of Inner-Mongolia and its correlation relationship with climate change during 1981-2000. The results show that： 1 ） from the eastern to the western part, the spatial distribution of net primary production had a descending tendency, and the inter-annual variation of net primary production in the whole area was apparent, especially during 1990-2000, and the variation rate could be due to 10.32 gC/m^2·a;2） the inter-annual variation of net primary production had apparent spatial differentiation; 3） correlation coefficients between inter-annual variation of net primary production and inter-annual variations of climate factors had apparent spatial differentiations; 4） various vegetation types had various responses to climate change, and the inter-annual variation of precipitation had more significant impact on vegetation dynamics than the inter-annual variation of temperature in the study area. This study displays the situation of the net primary production degradation in the central part of Inner-Mongolia and the correlation ralationship between climate change and the net primary production degradation. Moreover, it will provide scientific references for the restoration and reconstruction of the degraded vegetation.