EFFECT OF LIVING ROOTS ON SOIL ORGANIC-MATTER DECOMPOSITION

被引:122
作者
CHENG, WX
COLEMAN, DC
机构
[1] Institute of Ecology, University of Georgia, Athens
关键词
D O I
10.1016/0038-0717(90)90157-U
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Published information is contradictory about the inhibitory or stimulatory effect of living roots on soil organic matter decomposition. In this study, 14C-labelled rye straw was exposed in fertilized or unfertilized soil with or without plants (winter rye, Secale cereale) for 49 days under semi-controlled conditions. Our objective was to study the effect of roots on soil organic matter mineralization under different mineral nutrient conditions. The planted treatment had a higher 14CO2 loss and a higher efficiency of 14C-labelled material utilization by microorganisms. Fertilization decreased 14CO2 loss. Percent 14C in microbial biomass was positively correlated with percent 14C respired. Total microbial biomass, 14C-labelled microbial biomass and total 14C remaining of the rhizosphere soil were higher compared to bulk soil. Living roots had a stimulatory effect on soil organic matter decomposition due to the higher microbial activity induced by the roots. This stimulatory effect was reduced by application of fertilizer. © 1990.
引用
收藏
页码:781 / 787
页数:7
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