陕西省植被净第一性生产力时空变化研究

利用1981~2000年GloPEM光能利用率模型数据、土地覆盖数据和中国县域行政区划矢量数据,对陕西省植被净第一性生产力(NPP)总量变化、空间分布格局及其变化特征进行了研究。结果表明,陕西省多年平均NPP总量为1.59×1014gC/a,单位面积年均NPP为771 gC/(m2.a)。20年来,陕西省植被年均NPP在波动中虽然有增加但总量仍呈减少趋势,即从1981年的1.55×1014gC/a减少到2000年的1.50×1014gC/a。陕西省单位面积年均NPP的空间分布格局显著,呈现出由南北向中部递增的趋势。陕西省年均NPP的空间变化明显,其中有43.4%的地区年均NPP增加,主要集中在陕南秦巴山区和关中平原;有56.6%的地区年均NPP减少,主要集中在陕北黄土高原。

Spatial-temporal Change of the Terrestrial Net Primary Production(NPP)in Shaanxi Province

Based on GloPEM datasets,global land cover data and China administrative division vectograph,the terrestrial net primary production(NPP) and its spatial-temporal change in Shannxi during 1981-2000 were studied.As a result,a total annual mean NPP in Shannxi was 1.59×1014gC and the annual NPP per unit area was 771 gC/(m2·a).In the past 20 years,the annual NPP decreased from 1.55×1014 gC in 1981 to 1.50×1014 gC in 2000.The distribution of annual mean NPP was obvious,which was increased from south and north to central section.The spatial-temporal change of annual NPP in Shannxi was distinct.During the period from 1981 and 2000,the annual NPP of Qinba Mountains and Guanzhong Plant were increased and the annual NPP of Loess Plateau of Northern Shaanxi was decreased.