栾城县种植业结构演替的功能效应分析

Analysis on structure succession of farmland ecosystems and its function change in Luancheng County.

分析了河北省栾城县40年种植业结构演替特征及其功能效应,结果表明,以产量为主目标的结构演替能较充分发挥光、热生产潜力,但环境压力相应增加,营养平衡不协调及结构稳定性下降等。改善种植业系统的持久度,应开拓新的生态位,加强第一性生产力的多级转化利用,并以资源高效利用为目标进行结构调整。

The structure succession of farmland ecosystems and its function change in the last 40 years in Luancheng County were analysed. The results show that the structure succession along the main objective of yield can bring the light and energy potential into full play, mean-while, lead the increase of stress on resources and environment, and decline the structure sta-bility and nutrition balance structure. To improve the sustainability of farmland ecosystem, new ecological niche should be expanded to strengthen the multiple transformation of primary productive forces, and the structure should be adjusted to increase the overall efficiency of re-sources use.