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本文对地处北亚热带丘陵的驸马庄村以土地持续利用为目标的复合农业生态系统进行了综合的功能评价。系统的总体生产特性以粮食生产及农业总产值的持续性、稳定性为定量指标,以协调性(多样性)作为农业备部门协调发展的指标,较满意地反映了实际情况。对系统的能量、氮、磷、钾养分及资金的投入产出分析表明以上各项要素的总流通量在近10年中都有较大增长,系统的开放度相应提高。农田亚系统的光能利用率提高,能量产投比下降。磷、钾的产投比远大于1,导致土壤磷、钾的严重亏缺。畜牧亚系统各项效率明显增长。土地的人口负载力在动物产品大幅度增长条件下,从每公顷13.8人提高至15.5人,食物生产能力可负载两倍于现有的人口。
In this paper, we carried out a comprehensive functional assessment of the composite agroecosystem in Damazhuang village located in the north subtropical hilly region with the goal of sustainable land use. The overall production characteristics of the system take the sustainability and stability of grain production and agricultural output as quantitative indicators and the coordination (diversity) as indicators of coordinated development of agricultural equipment departments, which more satisfactorily reflect the actual situation. The input-output analysis of energy, nitrogen, phosphorus and potassium of the system shows that the total amount of the above factors has increased greatly in the past 10 years, and the openness of the system has been correspondingly increased. Utilization of farmland sub-system of light energy efficiency, energy production dropped. Phosphorus, potassium production ratio far greater than 1, resulting in a serious shortage of soil phosphorus and potassium. Animal husbandry and sub-system of the efficiency of significant growth. The population load of land increased from 13.8 to 15.5 per hectare under the condition of substantial growth of animal products, and its food production capacity can be twice as large as that of the existing population.