摘要
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。
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.
出处
《农业科技与装备》
2014年第9期7-8,12,共3页
Agricultural Science & Technology and Equipment
关键词
有机质含量
耕地土壤
分级
时空变化
organic matter content
soil
classification
spatial-temporal variation
