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农田生物质能的数量、空间分布格局以及年际变化研究对于生物质能集约利用的规划、选址以及后续的原料供需预测尤为重要。本文基于EOS/MODIS卫星2000～2006年的MOD17A3数据集,在栅格尺度下,利用农田净初级生产力对广东省农田生物质能数量进行估算,分析其空间分异特征,应用邻域统计分析提取了生物质能分布优势带。并利用趋势线分析方法对其时间动态和年际稳定性进行研究。结果表明,广东省在2000～2006年间农田生物质能总量呈下降趋势,主要因为农田面积在不断减少。从另一方面看,农田生物质能单位平均能值总体呈略微上升趋势。其中2000～2002年均值呈明显的下降趋势,2002～2004年呈现迅速增加趋势,2004年后又呈现回落特征。单位平均能值最大的年份是2004年,为5775.10KJ/(m2.a);最小为2002年,为4697.87 KJ/(m2.a)。区域单位能值的增长为农田生物能源的利用提供物质基础。研究结果能为区域农田生物能源利用提供数据支持和决策依据。
The quantity of biomass, the spatial distribution pattern and the interannual variation of farmland biomass energy are particularly important for the planning and site selection of biomass intensive utilization and the subsequent forecast of supply and demand of raw materials. Based on the MOD17A3 dataset of EOS / MODIS satellite from 2000 to 2006, the net primary productivity of farmland was used to estimate the quantity of farmland biomass in Guangdong Province on the grid scale. The spatial heterogeneity of farmland was analyzed. Biomass energy distribution advantage belt. And use trend line analysis method to study its time dynamics and interannual stability. The results showed that the total biomass of farmland in Guangdong Province decreased from 2000 to 2006, mainly because the area of farmland was decreasing. On the other hand, the average emergy value of farmland biomass energy unit shows a slight upward trend overall. Among them, the mean value from 2000 to 2002 showed a significant downward trend, showing a rapid increase trend from 2002 to 2004, and then showing a decline characteristic after 2004. The year with the highest average unit energy was 5775.10KJ / (m2.a) in 2004 and 4697.87 KJ / (m2.a) in 2002. The increase of the emergy value of regional units provides the material basis for the utilization of farmland bioenergy. The results can provide data support and decision-making basis for the utilization of farmland bio-energy.