近55 a新疆植被净初级生产力的时空变化

The Spatiotemporal Variation of Net Primary Productivity of Vegetation in Xinjiang in Recent 55 Years

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。

By utilizing the Atmospheric Vegetation Interaction Model （AVIM2）, Analysis of the NPP in Xinjiang within recent 55 years under spatial resolution of 0.05° x0.05° was conducted, and the characteristics on spatiotemporal evolvement of NPP under climate change and the relationship between NPP and both temperature and precipitation was also analyzed. The results showed, （1 ）The average of NPP in Xinjiang in recent 55 years was 92.4 gC＊m_2, the maximum value of 107.1 gC＊m＂2 presented in 1993 while the minimum value of 79.0 gC＊m＂2 presented in 2014. The amount of NPP in Xinjiang in recent 55 years showed a slowly increasing trend in time dynamics, the rate of increasing was approximately 1.8 gC ＊m_2 every 10 years. （2）The maximum value of NPP presented in summer, then followed by in autumn,and in spring it ranked the third. The NPP value of mountain area was higher than that in plain area. （3）Precipitation had a significant positive correlation to NPP in Xinjiang, while temperature had less significant positive correlation to NPP, which indicated that the increase of precipitation had more positive influences on NPP than the increase of temperature did.