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《Journal of Soil and Water Conservation》 2017-04
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Effects of Mulching on Soil Aggregate Distribution and Stoichiometry in Walnut Orchard

SUN Meng;LIANG Manman;LI Han;LI Baoguo;QI Guohui;ZHANG Xuemei;College of Forestry,Agricultural University of Hebei/Key Lab of Genetic Resource of Forest and Forest Protection of Hebei Province;Research Center for Walnut Engineering and Technology of Hebei;  
To confirm the effects of mulching on soil aggregate characteristics,the distribution of microaggregate and macro-aggregate and also stoichiometry of macro-aggregate were explored.In the 20—40cm soil layer mulched with manure,the percentage of the 10~150μm micro-aggregate was 84.5%,which was3.7% higher than control,while the percentages of the 1~5mm macro-aggregate and the 5mm macroaggregate were 47.74% and 33.04%,respectively,and the corresponding changes were 56.8% and 49.5%compared with control.In the 0—20cm soil layer,total N,total P,TOC of all soil aggregates mulched with manure were,on average,1.04,0.81 and 14.39g/kg,respectively,which were 2.9,5.1,1.4times that measured in control,and the corresponding values under treatment with wood chips were 0.61,0.32,and7.42g/kg,respectively,which were 1.7,1.0,2.3times that measured in control.The C/N,C/P,N/P ranges of soil aggregate mulched with manure were 8.29~22.65,4.45~27.18 and 0.44~1.89,respectively,and the ranges of that of wood chips were 4.09~29.60,5.32~59.88 and 1.04~3.29,respectively,while the control were 4.71~12.24,10.08~25.42 and 0.86~3.10,respectively.In all,mulching promotes the percentage of the 1~5mm macro-aggregate and weaken the5mm macro-aggregate and micro-aggregate.Moreover,the total N,P,TOC and C/N,C/P of the soil aggregates were all increased in degree with muchling.
【Key Words】: mulching walnut soil aggregates stoichiometry
【Fund】: 国家林业行业公益专项(201504408);; 河北省科技支撑计划项目(16236810D)
【CateGory Index】: S664.1
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