近55a新疆植被净初级生产力的时空变化

利用大气植被相互作用模型AVIM2分析了时间长度为55 a、空间分辨率为0.05°×0.05°的新疆植被净初级生产力(NPP),分析了气候变化下NPP的时空演变特征,并研究了其与气温和降水量的关系。结果表明,(1)近55 a新疆NPP平均值为92.4 gC·m~(-2),其中1993年最高为107.1 gC·m~(-2);2014年最小为79.0 gC·m~(-2)。近55 a新疆NPP总量的时间动态变化呈缓慢增加趋势,每10 a的递增速率约为1.8 gC·m~(-2)。(2)夏季是NPP最大的季节,其次是秋季,春季列第三位。山区NPP值较平原高。(3)新疆NPP对降水量变化呈显著正相关,气温的变化对NPP的影响不显著,说明降水的增加相对气温的升高,对新疆植被净初级生产力的变化有着更加积极的影响。

Temporal and spatial variation of net primary productivity in Xinjiang under Climate Change

Based on the latest meteorological observations and the atmosphere-vegetation interaction model (AVIM2) , the net primary productivity (NPP) of Xinjiang from 1961 to 2015, with the spatial resolution of 0.05°×0.05° grids, were analyzed the spatial-temporal characteristics of NPP under climate change under and studied its relationship with temperature and precipitation. The results show that the mean NPP of Xinjiang over the 55 years is 92.4 g C.m_-2, which in 1993 was the highest 107.1 gC.m_-2, 2004 was the lowest 79.0 gC.m_-2.Dynamic changes of the total NPP showed a slight upward trend in Xinjiang in recent 55 years. The increasing rate is about 1.8 gC.m_-2 every 10 years.1980 is an increase of the total NPP point mutation. Summer is the biggest season of NPP, followed by spring and autumn row of the third. The NPP value of mountain area is higher than that of plain. NPP in Xingjiang is more sensitive to precipitation than to temperature. It indicated that the increase of precipitation had a positive effect on the change of net primary productivity of vegetation in Xinjiang.