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《Journal of Northwest A & F University(Natural Science Edition)》 2011-01
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Spatial distribution characteristics of soil organic matter and nitrogen of three shrub lands in Loess Plataeu

SHE Diao,ZHU Pan-pan,LI Hao-Hong,SONG Juan-li,WU Fa-qi(College of Resources and Environment,Northwest A&F University,Yangling,Shaanxi 712100,China)  
【Objective】 This paper analyzed the spatial distribution characteristics of soil organic matter and nitrogen of three shrub lands on different soil layers of profile,different slope aspects and different slope positions in Loess Plateau and provided basic data for soil cultivation.【Method】 Using the wild grass land as contrast,the spatial distribution characteristics of organic matter and nitrogen of Caragana korshinskii Kom.land(CKK),Hippophae rhamnoides L.land(HRL) and Natural Secondary Forest land(NSF) on different soil layers of profile(0-20,20-40,40-60,and 60-80 cm),different slope aspects(sunny slope,half sunny slope,and shady slope) and different slope positions(upper slope,middle slope,and lower slope) were studied by field investigation and sampling,soil analysis,and mathematical statistics.【Result】 The organic matter contents of the three shrub lands decreased from topsoil to basement soil and the differences of any two layers were significant.There was no marked difference in total nitrogen contents between different layers,meanwhile the alkali-hydrolyzed nitrogen content of topsoil was higher than 20-80 cm soil layer,but no marked differences between 20-40,40-60,and 60-80 cm soil layers.The organic matter of CKK had no significant differences between upper,middle,and lower slope,while that of HRL decreased and that of NSF increased from upper to middle and lower slope.The total nitrogen contents gradually decreased from upper to middle and lower slope except that of NSF increased at first then decreased.The contents of organic matter and total nitrogen on different slope aspects were similar(shady slopehalf sunny slopesunny slope),but the alkali-hydrolyzed nitrogen on different slope aspects showed no obvious variation trend.【Conclusion】 Most of the organic matter,total nitrogen and alkali-hydrolyzed nitrogen contents of shrub lands in Loess Plateau were "middle" grade,and had different spatial distribution characteristics between different soil layers on profile,different slope aspects and positions.
【Fund】: 中国科学院知识创新项目(KZCX2-XB2-05-01);; 科技部科技基础性工作专项(2007FY210300)
【CateGory Index】: S714.8
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