我国温带荒漠生物土壤结皮孔隙结构分布特征

摘要/Abstract

摘要： 对原状生物土壤结皮孔隙结构、孔隙率及其垂直连通性进行室内微观扫描与计算机断层摄影成像分析。结果表明,生物土壤结皮团聚体特征明显,其孔隙率的增大主要是由大孔隙数量的增加而形成,同时,土壤孔隙连通性也随大孔隙数量的增加而增大,生物土壤结皮的发育导致表层土壤具有明显的极其复杂的土壤结构演化特征。

关键词: 生物土壤结皮, 孔隙率, 荒漠生态系统

Abstract: X-ray micro-CT imaging coupled with 3D image analysis based on specific procedures for porous media have been applied to the analysis of the porosity structure of the lichen crusts at the Shapotou Desert Research and Experiment Station in the Tengger Desert, northern China. The results indicated that it will provide a very accurate quantification of the internal structure of lichen crusts due to stabilization of sand dune of different age. The general trend with the age of the lichen crusts is a reduction in volume of connected pores but an increase of the size of the remaining connected ones. The lichen crusts aggregates show a general increase of average pore network tortuosity reaching the maximum value with the age, and also exhibit a significant anisotropy of the tortuosity. In such cases the pore network has resulted more tortuous in vertical direction. Measurements on the pore space architecture have allowed to following from a new point of view the long term evolution of the surface stabilization process in the Tengger Desert region.

Key words: biological soil crusts, porosity, desert ecosystem

中图分类号:

S154.3

王新平;李新荣;潘颜霞;王正宁;全桂静;G. Mele;A. Tedeschi. 我国温带荒漠生物土壤结皮孔隙结构分布特征[J]. 中国沙漠, 2011, 31(1): 58-62.

WANG Xin-ping;LI Xin-rong;PAN Yan-xia;WANG Zheng-ning;QUAN Gui-jing;G. Mele;A. Tedeschi. Pore Structure of Lichen Crusts in the Tengger Desert, China[J]. JOURNAL OF DESERT RESEARCH, 2011, 31(1): 58-62.

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