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 when compared with CT treatment, NT/RT significantly(P<0.05)increased 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 reduced micro-aggregate and silt clay fractions above 20 cm. NT/RT significantly(P<0.05)increased the SOC in macro-aggregate(>0.25 mm)and micro-aggregate(<0.25 mm)size classes above 20 cm soil depth as compared with CT. The results suggested 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.
Abstract：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 when compared with CT treatment, NT/RT significantly(P<0.05)increased 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 reduced micro-aggregate and silt clay fractions above 20 cm. NT/RT significantly(P<0.05)increased the SOC in macro-aggregate(>0.25 mm)and micro-aggregate(<0.25 mm)size classes above 20 cm soil depth as compared with CT. The results suggested 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.
基金资助:National Natural Science Foundation of China(31860361);The National Natural Science Foundation of Ningxia Hui Autonomous Region(2019AAC03055);The Scienceand Technology Young Talent Project of Ningxia Hui Autonomous Region(TJGC2019075);The Young Project from Ningxia University
引用本文:
LU Xingli,LI Shanshan,LIU Jihu,DUAN Yaxin,YUE Heng,KANG Jianhong,WU Hongliang. Distribution of soil water-stable aggrega-tes and organic carbon content affectedby tillage systems: a meta analysis[J]. 排灌机械工程学报, 2021, 39(10): 1051-1055.
LU Xingli,LI Shanshan,LIU Jihu,DUAN Yaxin,YUE Heng,KANG Jianhong,WU Hongliang. Distribution of soil water-stable aggrega- tes and organic carbon content affected by tillage systems: a meta analysis. Journal of Drainage and Irrigation Machinery Engin, 2021, 39(10): 1051-1055.
