凤城市耕地土壤有机质时空变化研究

摘要

The paper analyzed the changes of organic matter contents in nearly 25 a urban lands in order to know the condition of farm-land soil fertility in Fengcheng.The results showed that content of soil organic matter changed from the scarce into medium level. And a small proportion of cultivated land disappeared (level 5) with the increasing length of farming.%为掌握凤城市耕地土壤的肥力状况，对比分析近25 a 的土壤有机质含量变化情况。结果表明：近25 a 凤城市各乡镇（区）土壤有机质平均含量由较缺乏转化为中等水平；随着耕作年限的增加，较小比例的五级（缺乏）水平耕地消失。