区域农田生态系统生产力稳定性评价——以河北雄县为例

Evaluation on Productivity Stability of Regional Farmland Ecosystem

[目的]评价区域农田生态系统生产力稳定性。[方法]根据雄县17个乡镇的粮食平均产量及平均耕地面积,比较了不同区域及不同年份生产力的稳定性,评价了农田生产力的稳定性。[结果]年度间17个乡镇20年粮食生产力水平可归为3类,第1类的生产力水平为3 060.0 kg/hm2,第2类的生产力水平为4 810.5 kg/hm2,其他为第3类。区域间17个乡镇的粮食生产力水平可归聚成4类。年度间粮食生产力的稳定性分析表明1973年显著低于平均生产力水平,1977年显著高于平均生产力水平。区域间粮食生产力的稳定性分析表明17个乡镇中有10个乡镇的生产力稳定性低于平均稳定性,7个乡镇高于平均稳定性。[结论]雄县农田生态系统生产力稳定性较好。

[ Objective ] The study was to evaluate the productivity stability of regional farmland ecosystem, [ Method ] The productivity stability of different region and in different years was compared and the stability of farmland productivity was evaluated according to the average grain yield and farmland area of 17 towns in Xiong County. [ Result] As for years, the grain productivity of 17 towns in 20 years could be divided into 3 groups, the productivity of first group was 3 060.0 kg/hm^2 and that of the second was 4 810.5 kg/hm^2, the other was the third. As for regions the grain productivity of 17 towns could be clustered into 4 groups. Stability analysis of grain productivity among years showed that grain productivity in1973 was obviously lower than average productivity level and that in 1977 was significantly higher than average productivity level. Stability analysis of grain productivity among regions showed that productivity stability of 10 towns among 17 towns was lower and that of 7 towns was higher than the average stability. [ Conclusion] The stability of farmland ecosystem in Xiong County was better.