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Scientia Silvae Sinicae ›› 2007, Vol. 43 ›› Issue (05): 24-29.doi: 10.11707/j.1001-7488.20070504

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Biomass of Fine Root and Its Relationship with Water-Stable Aggregate in Compound Lands of Triploid Populus tomentosa on Lands Converted from Agricultural Lands

Dong Huixia1,2,Li Xianwei1,Zhang Jian1,Fan Bing1,3,Fan Chuan1   

  1. 1.State Key Laboratory of Ecological Forestry Engineering,Sichuan Agricultural University Ya'an 625014; 2.College of Life Sciences,Henan Normal University Xinxiang 453007; 3.Institute of Applied Ecology,Chinese Academy of Sciences Shenyang 110016
  • Received:2006-04-28 Revised:1900-01-01 Online:2007-05-25 Published:2007-05-25

Abstract:

Taking unconverted steep slope farmland as control site,a study on biomass of fine root and its relationship with water-stable aggregate in two herbaceous modes of four years triploid Populus tomentosa lands converted from agricultural lands were conducted.Results showed that the biomass of fine root(≤1 mm)in different layers are different as following descending sequence:upper layer,middle layer,lower layer,and at an approximately ratio as 50∶30∶20.Average biomass every year of fine roots in ryegrass were two times more than that of natural grass-forest compound lands;Total amount of natural grass root was 4.4 times than that of ryegrass mode.Water-stable aggregate of upper layer,middle layer,lower layer and unconverted lands represented no significant differences,whereas water-stable aggregate of big-particle in upper and middle layer were much higher than that of unconverted lands,water-stable aggregate of natural grass-forest lands were higher than that of managed grass-forest lands.Two-way analysis of variance indicated that fine root(≤1 mm)can enhance water-stable aggregate and total water-stable aggregate significantly.Consequently,project converting agricultural lands to forest-grass lands were effective on improving anti-erosion capability.

Key words: fine root, grass root, biomass, water-stable aggregate