广西罗城县桥头乡农业系统生产力（ASP）的初步分析

The Preliminary Analysis on the Agrosystem Productivity (ASP) in Qiaotou Township, Luocheng County, Guangxi

从农业系统生产力的角度，探讨桥头乡在实施生态农业规划前后的农业系统生产力及其系统特性结果表明，经过４年多的生态农业规划实施，桥头乡农业系统生产力指数达到８７．００７×１０１２Ｊ·元／ｈｍ２，比实施前的８．７４８×１０１２Ｊ·元／ｈｍ２，增加８．９５倍，系统持续性达２１．３４６，比实施前增加８．８９倍，系统稳定性为０．９７２，达显著水平。农、林、牧、渔子系统的生产力指数分别比实施前增加１．５１倍，１０．７８倍，１．０７倍和０．４６倍。

The agrosystem productivities and characteristics before and after carrying out the program of ecological agriculture in Qiaotou Township was studied. The results show that after more than 4 years that the program have been carried out, the agrosystem productvity index reaches 87. 007×1012 J. Yuan. (hm2)-1 and 8.95 times more than that 8.748×1012 J. Yuan ·(hm2)-1 before the implement of the program; the agrosystem sustainability reaches 21. 346,and 8. 89 times more than that before the implement of the program; the agrosystem stability is 0. 977. The agrosystem productivity indexes of the sub-agrosystems, farming, forestry, raise stock and fishery increaes 1. 51, 10. 78, 1. 07 and 0. 46 times respectively than before carrying out the program.