鼎湖山南亚热带森林细根分解干物质损失和元素动态生态学杂志.PDF

生态学杂志 　1998 ,17 (2) ∶1 - 6 Chinese Journal of Ecology 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 鼎湖山南亚热带森林细根分解 干物质损失和元素动态 温达志 ( 中国科学院华南植物研究所 , 广州 5 10650) 魏 　平 　张佑昌 ( 中国科学院华南植物研究所鼎湖山树木园 ,肇庆 526070) 孔国辉 ( 中国科学院华南植物研究所 ,广州 5 10650) Dry Mass Loss and Chemical Changes of the Decomposed Fine Roots in three China South Subtrop ical Forests at Dinghushan. Wen Dazhi , Kong Guohui ( S out h China I ns tit ute of B otany , A cadem ia S inica , Guangz hou 5 10650) , Wei Ping , Zhang Youchang ( D ing hus han A rboret u m , S out h Chi ) na I ns tit ute of B otany , A cadem ia S inica , Zhaoqing 526070 . Chinese J ou rnal of Ecology ,1998 ,17 (2) :1 - 6 . The exp eriment s of decomposition of fine root s were carried out in pine forest ( PF ) , pine - broadleaved mixed forest ( PB F) and evergreen broadleaved forest ( EB F) in t he Dinghushan biosp here reserve. Regression analyses showed t hat t he power function of X/ X0 = e - kt wit h Adj . r2 (0 . 989 - 0 . 993) very well fitted wit h t he data of dry mass loss against time (year) . The t heoretical values of annual decomposition rate of root s wit h diameter ≤2mm derived from t he equations were 43 . 44 % , 43 . 97 % , 46 . 9 1 % for PF , PB F and EB F resp ectively and also fitted very well wit h t he measured ( ) ( ) values 43 . 15 % , 43 . 90 % , 45 . 68 % . Decay coefficient s K were 0 . 570 for PF , 0 . 579 for PB F and 0 . 633 for EB F . The decomposition rate of root s wit h diameter of 2 - 4mm i