三江平原农田生产力时空特征分析

国志兴; 王宗明; 刘殿伟; 宋开山; 宋长春

三江平原农田生产力时空特征分析

Analysis of temporal and spatial features of farmland productivity in the Sanjiang plain

摘要

摘要: 为了提高农田生产力，该文基于EOS/MODIS卫星2000～2005年的MOD17A3数据集，分析了21世纪初三江平原农田生产力时间动态和空间分异特征。结果显示，2000～2005年三江平原旱田净初级生产力（换算成碳量）平均值为 348.06 g/(m2·a)，水田净初级生产力平均值为339.90 g/(m2·a)。2000～2005年三江平原旱田年均净初级生产力下降率为7.2%，水田年平均净初级生产力下降率为9.9%。研究表明，三江平原地区气候变化对农田生产力的下降有一定影响，同时随着该地区人口和经济活动的增加，人类活动对土地利用的加剧，亦导致农田生产力的下降。旱田和水田生产力空间分布与降水分布的相关系数分别为0.177和0.156，表明降水对农田生产力空间差异影响显著。

Abstract: In order to improve farmland productivity, the temporal and spatial features of farmland productivity were analyzed in the Sanjiang Plain from 2000 to 2005 based on the MOD17A3 data of NASA EOS/MODIS(TERRA). The results showed that the average net primary productivity (NPP) of dry farmland and paddy farmland from 2000 to 2005 were 348.06 g/(m2· a) and 339.90 g/(m2·a), respectively. Annual NPP of both dry farmland and paddy farmland were on descending trend from 2000 to 2005. The decline rate of dry farmland was 7.2%, and the decline rate of paddy farmland was 9.9%. The analysis shows that climatic change has some influences on the change trend of farmland productivity; meanwhile, the aggravation of effects on land-use by human activities has resulted in the decline of farmland productivity. The precipitation distribution has significant effect on the spatial distribution of farmland NPP, the correlation coefficient between the NPP spatial distribution of dry farmland and paddy farmland and the precipitation distribution are 0.177 and 0.156, respectively.

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