驸马庄复合农业生态系统功能的评价

Evaluation of the Functions of a Compound Agroecosystem

  • 摘要: 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)作为农业各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。

     

    Abstract: In this paper stability and sustainability of food production and agricultural output value were used to assess the general holostic production performances,and homogenity or diversity was used to express the overall agricultural development of the compound agro-ecosystem in Fuma village,which is located in the subtropical hilly region.The results from analysis of the input-output of energy,N,P,K and funds in each subecosystem showed that the overall flux of those factors and system openess were all increased in the recent ten years,and the utilization efficiency for solar radiation was increased,energy input-output ratio was decreased in cropland sub-ecosystem.For animal husbandary sub-ecosystem,transfer rates were increased significantly.The population bearing capacity of land was also increased from 13.8 persons/ha in 1980 to 15.5 persons/ha in 1989 based on the rapidly developing animal husbandary.By calculation it was suggested that the food production in this region could support double its present population.

     

/

返回文章
返回