Distribution of soil water-stable aggrega-tes and organic carbon content affected by tillage systems:a meta-analysis  

作　　者：LU Xingli LI Shanshan LIU Jihu DUAN Yaxin YUE Heng KANG Jianhong WU Hongliang 

机构地区：[1]College of Agronomy,Ningxia University,Yinchuan,Ningxia 750021,China

出　　处：《排灌机械工程学报》2021年第10期1051-1055,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：National Natural Science Foundation of China(31860361);The National Natural Science Foundation of Ningxia Hui Autonomous Region(2019AAC03055);The Science and Technology Young Talent Project of Ningxia Hui Autonomous Region(TJGC2019075);The Young Project from Ningxia University。

摘　　要：A better understanding of soil carbon(C)distribution within aggregate fractions is essential to evaluating the potential of no-till for sustaining productivity and protecting the environment.A meta-analysis on 744 comparisons from 34 studies was conducted to determine the effects of three different tillage treatments(conventional mouldbould ploughing tillage(CT),reduced tillage(RT)and no tillage(NT))on water-stable aggregate size distribution,soil C concentration in aggregate fractions.The meta-analysis indicates that compared with CT treatment,NT/RT significantly(P<0.05)increases macro-aggregate above 20 cm by 20.9%-82.2%(>2.00 mm)and 5.9%-19.1%(0.25-2.00 mm),whereas NT/RT significantly reduces micro-aggregate and silt clay fractions above 20 cm.NT/RT significantly(P<0.05)increases the SOC in macro-aggregate(>0.25 mm)and micro-aggregate(<0.25 mm)size classes above 20 cm soil depth compared with CT.The results suggest that soil sampling depth should be considered to evaluate the influence of tillage systems on the distribution of soil aggregate,and the content of aggregate-associated C content.

关 键 词：soil aggregation soil organic carbon reduced tillage soil depth 

分 类 号：S277.9[农业科学—农业水土工程] TK7[农业科学—农业工程]