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甘肃景电灌区土壤团聚体特征研究
引用本文:李小刚.甘肃景电灌区土壤团聚体特征研究[J].土壤学报,2000,37(2):263-270.
作者姓名:李小刚
作者单位:甘肃农业大学环境资源系,兰州 730070
摘    要:本文对甘肃景电灌区土壤团聚体组成及其稳定性进行了研究。结果表明,土壤团聚性很差,团聚体以非水稳性为主,稳定性很低。粘粒对于团聚体的形成和稳定性影响最大,显示土壤中粘粒物质是目前这一地区土壤结构形成的最为重要的胶结物质。碳酸钙对于团聚体形成的胶结作用次之,有机质由于含量低,其胶结作用最小,但是有机质对于团聚体稳定性的影响大于碳酸钙的影响,易溶性盐使团聚体的数量和稳定性降低,土壤微团聚体研究表明,土壤

关 键 词:甘肃景电灌区  土壤团聚体  稳定性  粘粒  土壤退化
收稿时间:1998/10/27 0:00:00
修稿时间:1998年10月27

THE CHARACTERISTICS OF SOIL AGGREGATE IN JINGTAI ELECTRIC-IRRIGATING AREA OF GANSU
Li Xiao-gang.THE CHARACTERISTICS OF SOIL AGGREGATE IN JINGTAI ELECTRIC-IRRIGATING AREA OF GANSU[J].Acta Pedologica Sinica,2000,37(2):263-270.
Authors:Li Xiao-gang
Affiliation:Department of Resouces and Environment, Gansu Agricultural University, Lanzhou 730070
Abstract:The soil composition of aggregate and its stability, in Gansu Jingtai electricirrigating area, were studied in this paper. The results showed that the content of aggregate is low and its stability is poor. When moistened, much a large portion aggregate is detached. Clay has the greatest influence upon aggregate and its stability, this means that clay currently is the most important aggregating agent the role of CaCO3, as aggregating agent, is the second and that of organic matter is the last because of its low content. However, the influence of organic matter upon aggregate's stability is greater than that of CaCO3. Soluble salts make the content and stability of aggregate decreased. The study of microaggregate demonstrated that nearly all of particles<0.005mm are distributed in microaggregates>0.01mm, indicating that clay<0.005mm is aggregated perfectly, and structure coefficients of nearly all soils reach one handred percent. The effect of CaCO3 on clay's aggregation is significant but organic matter plays minor role. Soluble salts has the trend detaching clay.In point of structure state and factors affecting its stability, soil wind erosion, low organic matter content and soluble salts accumulation were main reasons responsible for structure degeneration. The improvement and reconstruction of soil structure must go on with increase in organic matter, avoiding salinization and wind erosion and the improvement of ecological surroundings.
Keywords:Gansu Jingtai electric-irrigating area  Soil aggregate  microaggregate  Bonding agent
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