安徽省农田净初级生产力时空变化特征及影响因素——基于MOD17A3的研究

Temporal-Spatial Variation Characteristics and Influencing Factors of Farmland Net Primary Productivity in Anhui Province——Study Based on MOD17A3

基于MODIS/MOD17A3数据集,结合土地利用数据、气象数据,运用距平分析、相关分析等方法,分析了2000-2010年安徽省农田净初级生产力(NPP)的时空变化特征及影响因素.结果表明:安徽省农田以水田为主;研究时段内,安徽省农田年NPP均值及年NPP总量整体上呈现波动上升趋势;中产农田面积最大,低产农田次之,高产农田面积最小;农田NPP空间分异显著,呈由北向南递增的趋势,中低产水田和旱地主要集中在长江以北地区,高产水田和旱地分布于沿江及其以南地区;降水与水田和旱地NPP均值呈弱负相关关系,温度与水田和旱地NPP均值呈显著正相关关系;温度是影响安徽省农田生产力空间分异的主要气象因素.

The spatial-temporal variation characteristics and the effects of climate change on farm productivity m Anhui province was studied in terms of Moderate Resolution Imaging Spectroradiometer （MODIS） net primary productivity（NPP） data products from 2000 to 2010, land use data and meteorological data. The results showed that the paddy field is the main agricultural land in Anhui province. During the study period, the average annual NPP and the total annual NPP showed a fluctuation upward trend. The middle yield farmland area is thelargest, followed by low-yielding farmland, and the proportion of high yield farmland is the smallest. There is a significant spatial differentiation of farmland net primary productivity, which showed an increased trend gradually from north to south. Middle yield and low yield paddy field and dry land are mainly concentrated in the north of the Yangtze River, the high-yield paddy field and dry land are along the Yangtze river and the south of the region. The correlation between precipitation and average NPP in paddy field and dry land is weakly negative. The mean temperature and the average NPP of paddy field and dry land has a significant positive correlation. Temperature is the main meteorological factor affecting the spatial variation of farmland productivity in Anhui province.