%0 Journal Article
%T Effects of plastic film mulching periods on the soil nitrogen availability in semiarid areas<br>半干旱地区不同地膜覆盖时期对土壤氮素有效性的影响
%A LI Shiqing
%A LI Fengmin
%A SONG Qiuhua
%A WANG Jun
%A <br>李世清
%A 李凤民
%A 宋秋华
%A 王俊
%J 生态学报
%D 2001
%I 
%X A field experiment was carried out on cultivated loessial soil in semiarid areas with 415 mm precipitation and spring wheat ( Triticum aestivum L.) used as an indicating crop to study the effects of the plastic mulching periods on the soil nitrogen availability.The experiment had three factors and they were water storage in soil profile before sowing,plastic film mulching period and nitrogen fertilization.The water storage in soil profile before sowing had two levels under each of which there were no mul...
%K dryland soil
%K plastic film mulching
%K soil nutrients
%K accumulation of nitrate nitrogen<br>旱地土壤
%K 地膜覆盖
%K 土壤养分
%K NO-3-N累积
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=FE163E5DB2274E5937319DE98913EC37&aid=7A0E25570D8A38DC&yid=14E7EF987E4155E6&vid=659D3B06EBF534A7&iid=9CF7A0430CBB2DFD&sid=DEEC1AC3B6D3EB96&eid=28652329520A4AA7&journal_id=1000-0933&journal_name=生态学报&referenced_num=14&reference_num=23