Journal of Guangxi Normal University(Natural Science Edition) ›› 2013, Vol. 31 ›› Issue (3): 213-219.

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Characteristic of Soil Aggregate Structure in Different Typical Soils in Karst Region of Northwest Guangxi,China

HU Le-ning1,2,3, SU Yi-rong1,2, HE Xun-yang1,2   

  1. 1.Key Laboratory of Agro-ecological Processes in Subtropical Region,Institute of Subtropical Agriculture, Chinese Academy of Sciences,Changsha Hunan 410125,China;
    2.Huanjiang Observation and Research Station for Karst Eco-systems,Huanjiang Guangxi 547100,China;
    3.School of Environmental and Resources Science, Guangxi Normal University,Guilin Guangxi 541004,China
  • Received:2013-05-23 Online:2013-09-20 Published:2018-11-26

Abstract: In order to know the soil aggregate characteristic on typical Karst soils,two Karst soils (terra fusca and rendzina) and a zonality soil (red soil) were selected with different soil organic carbon (SOC) content for study.Soil aggregates were obtained with dry sieving method and wet sieving method for soil stability (PAD,MWD,WSA) analyses.The results showed that,MWD and WSA were in order of rendzina＞terra fusca＞red soil(p＜0.05).On the condition of the same content of SOC,red soil was the most easily to be destroyed than terra fusca and rendzina according to the result of PAD.This implied that Karst soil aggregate mechanical stability was better than that in red soil,and the resistance of soil erosion caused by rainfall resistance in Karst soils was better than that in red soil.There are significant differences between Karst soils and red soil,and it is closely related to SOC.From the point of view of soil aggregate,it benefits the stability of Karst soil SOC.

Key words: Karst, aggregates destruction rate, mechanical classification, water stable aggregates

CLC Number: 

  • S153.6
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