【摘要】 在统计数据的基础上,以山东省为例,利用模型量化了农田生态系统净初级生产力(NPP),并研究了农田生态系统NPP的时空格局及其影响因素。研究发现,2000—2006年间,山东省农田生态系统NPP在时间序列上整体呈上升的趋势,由2000年的476.5g·m-2·a-1(以C计)上升到2006年的544.2g·m-2·a-1(以C计)。空间格局中以鲁东、鲁中和鲁南较高,鲁西南和鲁北较低。各地市中以枣庄最高,为691g·m-2·a-1(以C计);东营最低,约424.4g·m-2·a-1(以C计)。另外,莱芜、临沂及菏泽等地也相对偏低。通过对影响农田生态系统NPP的自然因子和人为因子分别进行主成分分析发现:气候因子中对山东省农田生态系统NPP贡献最大的为降水;人为因子中以农膜的贡献最大,其次为农药、机械、化肥,而劳动力的贡献则随着科技的发展而降低,人口密度的过大对农田生态系统生产力具有较大的负面影响。更多还原

【Abstract】 The objectives of our studies were to quantify the net primary productivity(NPP),and to study the temporal and spatial pattern of NPP and its impact factors in regional agro-ecosystem Shandong province was selected as a case using a model and statistic data for the analysis.We found that the overall NPP of agro-ecosystem in Shandong province was increasing from 2000 to 2006.The spatial distribution of NPP was not even:the highest NPP was found in Zaozhuang and the lowest in Dongying.Moreover,NPP in Laiwu,Linyi and Heze were also relative lower.We analyzed the natural and man-made factors which could affect the NPP of agro-ecosystem using the principal component analysis.We found that the precipitation,a natural factor,had the largest contribution to the NPP of agro-ecosystem in Shandong province.In man-made factors,plastic films,pesticides,machinery and chemical fertilizers played important roles.However,the contribution of the labor force on NPP decreased along with the development of science and technology.Furthermore,high population density had a negative impact on NPP of agro-ecosystem.更多还原