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《Journal of Anhui Agricultural Sciences》 2011-29
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Preliminary Analysis on Abnormal Granularity Layers of Soil Profile and the Response of Relative Factors in Loess Plateau

LV Hai-bo et al(Institute of Soil and Water Conservation,Chinese Academy of Science and Ministry of Water Resources,Yangling 712100)  
[Objective]The paper was to analyze organic carbon content(SOC),granularity,total nitrogen content(TN),carbon-nitrogen ratio(C/N),calcium carbonate content(CaCO3) of 1cm soil profiles in returning forest in Zhifanggou watershed of Ansai County in Loess Plateau,so as to study the changes of physicochemical characters in abnormal layer of soil reflected with granularity,as well as the physical and chemical responses of soil.[Method] Three sampling plots with the size of 10 m×10 m were randomly selected in three sampling sites in Loess Plateau,three profiles in upper,middle and lower slope were excavated,and the samples were collected with interval of 10 cm;the surface layer with the depth of 0-10 cm was divided into two layers 0-5 cm and 5-10 cm for sampling,respectively.11 samples were collected in each profile with a total of 99 samples.Its organic carbon content,granularity,total nitrogen content,carbon-nitrogen ratio and CaCO3 content were analyzed.[Result] The soil profiles in three sampling sites contained five characteristical layers,including a1,b1,b2,c1 and c2,the content of soil granule with particle size 0.02 mm decreased,and those with particle size 0.02 mm increased,the organic carbon content and C/N value(a1,b1,b2,c2) increase,the increase trend of CaCO3 content was not obvious.[Conclusion] The study showed that the characteristical soil layer was commonly existed in loess region,especially the eroded loess region,which should be paid attention in the research fields of modern soil science and ecology.
【Fund】: 中国科学院知识创新项目(KZCX2-XB2-05-01);; 渭南师范学院科研计划项目(07YKZ056)
【CateGory Index】: S153.61
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