%0 Journal Article
%T Protective effect of agri-land ecosystem for soil fertility<br>农田生态对土壤肥力的保护效应
%A LU Jia-Long
%A <br>吕家珑
%J 生态学报
%D 2001
%I 
%X Research of long\|term fix\|experiments showed that in the semi\|arid area,the fallow was unfavourable to increase of soil organic matter content.It impelled to drop energy state,increase aromaticity extent and develop forward to aging of humic acid.Fallow made the soil composite aggregate change from G 2 to G\-1,decrease the activity of soil enzyme,increase the intensity of biochemistry action and decrease the level of total fertility.So,agri\|land ecosystem had protective effect of soil fertility.
%K fix-experiment
%K agri-land ecosystem
%K fallow
%K soil fertility<br>定位试验
%K 农田生态系统
%K 土壤肥力
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=FE163E5DB2274E5937319DE98913EC37&aid=82E2F76F5741570A&yid=14E7EF987E4155E6&vid=659D3B06EBF534A7&iid=E158A972A605785F&sid=9E7C0CB25117E09B&eid=984BD2F4D19B9D1C&journal_id=1000-0933&journal_name=生态学报&referenced_num=15&reference_num=16