Limited impacts of occasional tillage on dry aggregate size distribution and soil carbon and nitrogen fractions in semi-arid drylands

作     者：Wooiklee S.Paye Vesh R.Thapa Rajan Ghimire Wooiklee S.Paye;Vesh R.Thapa;Rajan Ghimire

作者机构：New Mexico State UniversityAgricultural Science CenterClovisNM88101USA New Mexico State UniversityDepartment of Plant and Environmental SciencesLas CrucesNM88003USA 

出 版 物：《International Soil and Water Conservation Research》 (国际水土保持研究（英文）)

年 卷 期：2024年第12卷第1期

页      面：96-106页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 082802[工学-农业水土工程] 090707[农学-水土保持与荒漠化防治] 0907[农学-林学] 08[工学] 0828[工学-农业工程] 09[农学] 0903[农学-农业资源与环境] 0815[工学-水利工程] 

基　　金：This research was funded by project No.GR0006188 of the USDA Natural Resources Conservation Service New Mexico.The study plots were established with funding from the New Mexico State University Agricultural Experiment Station 

主　　题：Conventional tillage Occasional tillage Aggregate associated carbon Mineral associated organic matter carbon(MAOM-C) Particulate organic matter carbon(POM-C) 

摘      要：Tillage management that minimizes the frequency and intensity of soil disturbance can increase soil carbon(C)and nitrogen(N)sequestration and improve the resilience of dryland cropping systems,yet the impact of occasional disturbance on soil aggregate formation and the soil organic carbon(SOC)storage within aggregates has not been studied *** evaluated the effect of four tillage management practices on soil dry aggregate size distribution,aggregate-protected C and N,mineral-associated organic matter carbon(MAOM-C),particulate organic matter carbon(POM-C),and corn(Zea mays L.)and sorghum(Sorghum bicolor(L.)Moench)yields in a semi-arid dryland cropping *** included conventional tillage(CT),strip-tillage(ST),no-tillage(NT),and occasional tillage(OT)management in a corn-sorghum *** macro-aggregates were 51-54%greater under ST,NT,and OT,while small and micro-aggregates were greater in *** tillage reduced soil aggregate-associated C by 28-31%in macro-aggregates and 47-53%in small aggregates at 26 months(M)sampling compared to ST,NT,and *** clay+silt fraction,CT had 14-16%,21-26%,and 36-43%less SOC at 7,14,and 26M samplings,respectively,than ST,NT,and *** associated N was generally similar under ST,NT,and OT,which was greater on average than *** MOAM-C and POM-C under ST,NT,and OT were generally greater than respective SOC fractions under CT at 19 and 26 M after OT *** and sorghum yields were similar among tillage systems in 2020,but greater under ST,NT,and OT than CT in *** results suggest that while frequent intensive tillage can lower SOC and N storage,a single stubble mulch occasional tillage after several years of NT does not lead to soil C and N losses and soil structural instability in semi-arid drylands.