摘要
以江西省常见的3种农田生态系统为研究对象,采用能值分析的相关理论,结合生态学研究方法,分析了各农田生态系统的能值投入产出能值,并引入能值分析的能值自给率、环境负载率、能值投入率、净能值产出率、购买能值率、系统生产优势度和系统可持续能值指标相关指标对其进行评价。结果表明,绿肥—甘蔗+大豆农田生态系统能值利用率经济效益较高,但是要求具有较高的管理水平;冬闲—早稻—晚稻农田生态系统,自然资源自给能力强,需要的购买能值投入低,抗外界干扰能力较强,但是净能值产出较低,系统能值可持续性也不高,经济回报率较低;油菜—早稻—晚稻农田生态系统购买能值投入较高,环境压力较大,但是能值产出较高。
Based on emergy theory and ecological methodology, taking three farmland ecosystems as the research object, this study studied the emergy input - output in different kinds of farmland ecosystems in the ecologieal economic region of Poyang lake, and then evaluated it with correlative index of emergy theory, such as emergy investment ratio, net emergy yield ratio, environmental loading ratio, emergy sustainable index and so on, so as to pick out the best cropping pattern. The study showed that： the green manure - sugar cane ＋ soybean farmland ecosystem had high economic benefits and product competitiveness, but it asked for a highly - qualified level of management. The winter fallow - early rice - late rice farmland ecosystem had high self - sufficient ability and anti -jamming ability, but it was inferior to other cropping patterns in net emergy yield ratio and emergy sustainable index, which means that its product competitiveness and economic benefits are bad. The rape -early rice -late rice farmland ecosystem had a environmental loading ratio and asked for a high invest- ment of purchasing
出处
《江西农业大学学报》
CAS
CSCD
北大核心
2013年第2期281-289,共9页
Acta Agriculturae Universitatis Jiangxiensis
基金
国家科技支撑计划项目(2007BAD89B18-03)
关键词
鄱阳湖生态经济区
农田生态系统
能值
the emergy, but it had a high net emergy yield ratio. ecological economic region of Poyang lake
farmland ecosystem
emergy
