海城市农业生态系统调控与承载力的研究

【作者】 张伟东；

【导师】 沈亨理； 徐仁杰；

【作者基本信息】 沈阳农业大学 ， 农业生态， 1990， 硕士

【摘要】 本文以模型、作物产量=f(环境生态;农业结构;农业技术;各种投入)为基础,研究农业生态系统作物生产力。分析不同类型农业生态系统作物生产力的限制因子及潜力,为提高作物生产力对农业生态系统从三个层次进行调控:高层次为流域的环境调控,中层次为功能调控,低层次为生物结构调控。预测调控后,在近期投入水平下的作物生产力,以土地生态适宜性评价为依据建立合理的土地利用结构。计算出农业生态系统的人口承载力,提出提高承载力的对策。更多还原

【Abstract】 Based on the model: crop yield=f(ecologi cal factors,agrocultural structure,agrote chnic,input) ,the study on crop productiv ity in agroecosystems was conducted.Limiting factors and potency of crop pro ductivity Were analysed in different agroecosystem types. For raising crop productivity, ecosystems were regulated and controled at three following levels:the high one being the regulation and control of environment of basin, the middle being that of fuction and the last being the regulation and control of biological structure. crop prod uctivity was predicted under late input conditions after regulation and control. Land—use structure was adjusted accordingto evalution of land ecological fitness Thepopulation supporting capacity of agroecosystems was ’calculated and strategi es of increasing the population supporting capacity were discussed.更多还原