奈曼旗沙漠化地区农业生态系统能流效益特征分析

ENERGY FLUX BENEFITS IN THE AGROECOSYSTEM OF THE DESERTIFIED AREA IN NAIMAN BANNER

本文探讨了奈曼旗沙漠化地区农业生态系统的能流效益,指出了该区农业生态系统能量总投入产出比为3.67;总产出能与商品能之比为12.72;总产出能与有机能之比为8.47;总产出能与机械能之比为13.22。并对该区11个农业子系统进行了综合评价。

The benefit of energy flux in the agroecosystem of the desertified area in Naiman County, Inner Mongolia is discussed in this paper. It is pointed out that in this agroecosystem the ratios of the total output energy to the input energy, the commodity energy, the organic energy and the mechani- cal energy are 3.67, 12.72, 8.47, and 13.22 respectively. Meanwhile, by using comprehensive assess ment method eleven agricultural subecosystems are evaluated, in this couse the weighted values are substituted with the par- tial correlation coefficients of the judging factors, which have been proved practical. The benefits of 11 agricultural sub-ecosystem are listed depend- ing on their scores from the highest to the lowest as follows: 0.7957 for maize; 0.5088 for sorghum; 0.3859 for soybean; 0.3580 for millet with no irrigation; 0.3256 for wheat plus buckwheat, 0.2910 for mung bean; 0.2533 for wheat; 0.2363 for millet with irrigation; 0.2352 for broomcorn millet; 0.2341 for buckwheat; and 0.0287 for watermelon. In addition, the benefit ratios in the above sub-ecosystems are ranging from 142.02 to 219.98. The input commodity energy (mainly chemical fertilizer energy) occupies about 28.9% the total input energy, while is higher than the national mean value of 23%.