摘要:采用2000-2015年MOD13Q1-16天合成的250 m分辨率NDVI时序数据，基于CASA改进模型估算了青海高原植被NPP，分析了近16年来植被NPP时空变化的特征与规律及其对气候因素变化的响应，并探讨不同区域生态保护工程建设的成效。研究结果表明：①青海高原植被NPP多年平均值242.50 gC m^-2 a^-1，空间上呈东高西低，南高北低，由西北向东南逐渐递增分布趋势；②2000-2015年，研究区年NPP分布在53.24-96.56 TgC，呈平稳增加，年增长率1.32 TgC/a；③气候的暖湿化是植被NPP增加的主要因素，降水、气温的耦合作用是青海高原植被NPP年际波动的重要因素，不同区域植被NPP受控因子存在差异；④不同生态保护工程的实施，对区域NPP时空格局及变化趋势存在不同程度的影响。其中，三江源地区年NPP上升趋势最为明显，环青海湖地区、东部地区次之，柴达木地区是最缓慢的地区。



Abstract:Based on MOD13Q1-250-m resolution-16-day synthesis NDVI data for the Qinghai Plateau from 2000 to 2015, by using the improved CASA model, we estimated the vegetation net primary productivity (NPP) of the Qinghai Plateau, analyzed the characteristics and regularities of NPP spatial-temporal variation, evaluated the correlation between NPP and meteorological factors, and explored the ecological effect of ecological protection project in different regions. The results indicate the following:① The average annual NPP in the Qinghai Plateau is 242.50 g C m^-2 a^-1, which is high in the east and south and increases from northwest to southeast. ② During 2000-2015, the annual amount of NPP increased stably from 53.24 to 96.56 Tg C, with an annual growth rate of 1.32 Tg C/a. ③ The warm and humid climate is the main factor affecting the increase in vegetation NPP, and precipitation and temperature are significant factors in the inter-annual fluctuation of NPP in the Qinghai Plateau. Additionally, in different areas, the factors controlling NPP growth differed. ④ The implementation of different ecological protection projects has a varying influence on spatial-temporal patterns and inter-annual trends in regional NPP. Among them, the annual increasing trend in NPP in the Sanjiangyuan region was the most obvious, followed by the Qinghai Lake area, Eastern region, and Qaidam region.





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