城郊型生态农业系统种植业结构和物质循环分析

Studies on Structure and Matter Cycling of Planting in Suburban Eco-agrosystem

本文以云南小甸头村为城郊型生态农业系统的典型研究对象，分析其种植业结构、物质循环６年的动态变化及其原因。结果表明：①结构从传统单一种粮型向粮、林、果、菜商品经济型转变；②经济收入明显增加；③Ｎ、Ｐ和Ｋ输入逐年增加；④生态农业建设初期，Ｎ、Ｐ和Ｋ输出增加，但后期降低；⑤生态农业系统建设初期，Ｎ、Ｐ和Ｋ的产投比增加，平衡强度降低，但后期由于猪粪尿输入过量，导致系统物质输入增大，物质输出相对降低，产投比降低，平衡强度和盈余增加。在以上研究的基础上，提出了种植业持续发展的调控对策：①稳定粮食播种面积；②适当控制有机肥施入。

In this paper,Xiaodiantou Village as a typical suburban eco-agrosystem was studied.Changes and the reasons of structure,input,output,cycling and balance of N,P 2O 5 and K 2O in planting in six years were analysis,results showed:①structure changed from traditional cereals planting to cereals,forest,fruit and vegetable commerical economic type;②economic income increased obviously;③input of N,P 2O 5 and K 2O increased;④output of N,P 2O 5 and K 2O increased at the initial stage of eco-agrosystem construction,but it decreased later on;⑤output-input ratio increased,balance strength and shorage-surplus value decreased at the initial stage,but output-input ratio dereased,balance strength and shortage surplus value increased later on,because of increasing input of pig excrement excessively and decreased output of cereals obviously.Based on studies,readjusting measures for sustainable development in planting were put forward:①stabilizing planting area of cereals;②reducing input of organic fertilizer and nitrogen fertilizer suitably.