CAJ | 학술논문

土壤开裂影响土体内水分散失、溶质运移及土体结构,是元谋干热河谷坡地退化的一个重要过程及特征.该文通过对元谋干热河谷退化坡地典型土壤裂缝样方的实地调查及数据的室内分析,系统分析了土壤理化属性对裂缝发育程度的影响.研究结果表明:1)土壤裂缝发育程度与土壤黏粒含量、土壤胀缩度、土壤容重呈正相关,与土壤有机质含量、土壤总孔隙度呈较弱的负相关;2)土壤裂缝发育程度的首要影响因子是土壤结构性因子(土壤容重、总孔隙度和黏粒含量),其次为土壤胀缩度,然后是土壤有机质.该研究可为进一步研究土壤开裂导致的土地退化过程奠定基础,为制定开裂土体的改良措施提供参考.
토양개렬영향토체내수분산실、용질운이급토체결구,시원모간열하곡파지퇴화적일개중요과정급특정.해문통과대원모간열하곡퇴화파지전형토양렬봉양방적실지조사급수거적실내분석,계통분석료토양이화속성대렬봉발육정도적영향.연구결과표명:1)토양렬봉발육정도여토양점립함량、토양창축도、토양용중정정상관,여토양유궤질함량、토양총공극도정교약적부상관;2)토양렬봉발육정도적수요영향인자시토양결구성인자(토양용중、총공극도화점립함량),기차위토양창축도,연후시토양유궤질.해연구가위진일보연구토양개렬도치적토지퇴화과정전정기출,위제정개렬토체적개량조시제공삼고.
Soil cracking is an important process and feature of the slope degradation in Yuanmou Dry-hot Valley Region, which influences water evaporation, solutes transport and soil structure. In this paper, 25 soil crack quads were investigated by using the photography method to describe the morphology of soil cracks, and meanwhile, soil samples were also obtained at soil depth 0-30 cm and >30-60 cm in the same quad. The crack area density (Dc) was obtained by ArcGIS 9.0. The values for soil physico-chemical properties were also obtained by laboratory analysis. And then, the influences of soil physico-chemical properties on the development degrees of soil cracks were analyzed by application of statistical analysis methods. The Results indicate that: (1) The development degrees of soil cracks have a positive correlation with clay content, swell-shrink property and bulk density, and are negatively correlated to organic content and soil porosity. Dc, which is the quantitative indicator for the development degrees of soil cracks has been found to have a significant strong correlation with clay content, their coefficients were 0.97 and 0.95 for 0-30 cm layer and for >30-60 cm layer respectively. And for Dc and bulk density, their relationship also appears significant positively correlated, witch was 0.81 and 0.68 for 0-30 cm and >30-60 cm layer respectively. Dc and swell-shrink property has the same correlation with its coefficient of 0.81. However, as for Dc and organic content, Dc and soil porosity, the correlations were found to be negatively correlated with coefficients of -0.55 and -0.72 for the layer of 0-30 cm. On the basis of that, each regression equation for Dc and other influential factors are given by application of the regression analysis. (2) The soil structural indices (including bulk density, soil porosity and clay content) are the most important factors affecting the development degrees of soil cracks, then followed with swell-shrink property and organic content. Principal component analysis shows that among the 9 principle components, the principle component 1 (PC1), principle component 2 (PC2) and principle component 3 (PC3) are able to explain most of the variance information with their accumulative contribution of 94.98%. And PC1 is the structural factor mainly consists of soil bulk density, soil clay content and soil porosity. PC2 and PC3 mainly reflect soil organic matter and soil swell-shrinkage property. The research results can be expected to provide theoretical references for the further study on soil cracking mechanism and for proposing reasonable measurements on amelioration of cracked soil.