%0 Journal Article
%T Origins of soil organic carbon with the method of natural 13C abundance in maize fields<br>用天然13C丰度法评估贵州茂兰喀斯特森林区玉米地土壤中有机碳的来源
%A PIAO Hechun
%A LIU Qiming
%A YU Dengli
%A GUO Jingheng
%A RAN Jingcheng
%A <br>朴河春
%A 刘启明
%A 余登利
%A 郭景恒
%A 冉景丞
%J 生态学报
%D 2001
%I 
%X Following the conversion of forest ecosysterm to agricultural ecosysterm, the introduction of C4 plant to a soil,previously developed under C3 vegetation,brings to a different origin of soil organic carbon.In consequently it leads to the isotopical change in the composition of organic carbon. The results showed that the proportion of soil organic carbon derived from the forest still predominates after several decades of cultivation in maiz fields in Guizhou Maolan Karst Forest. The soil organic carbon originated from initial C3 vegetation amounts to 66.7 % of the total. The contents of easily mineralizable organic carbon which can efficiently supply nutrients to plant are very small. Therefore, it is necessary to optimize the management of plant residues incorporated into the soils.
%K forest ecosystem
%K agricultural ecosystm
%K stable C isotope
%K plant residues
%K Karst<br>森林生态
%K 农田生态
%K 稳定C同位素
%K 植物残留物
%K 喀斯特森林
%K 土壤
%K 有机碳
%K 玉米地
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=FE163E5DB2274E5937319DE98913EC37&aid=82901271BA259875&yid=14E7EF987E4155E6&vid=659D3B06EBF534A7&iid=38B194292C032A66&sid=E57FE519484CFB70&eid=AC2617B68B137D9D&journal_id=1000-0933&journal_name=生态学报&referenced_num=22&reference_num=14