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Comparison of Micromorphological Features of Two Agricultural Cultivated Soils in guanzhong areas, Shaanxi Province, China

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Agricultural Sciences in China 2007年第9期6卷 1089-1098页

作者： PANG Jiang-li QIU Hai-yan HUANG Chun-chang CHA Xiao-cun ZHANG Xu College of Tourism and Environmental Sciences Shaanxi Normal University Xi＇an 710062 P.R.China State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences （CAS） Xi＇an 710075. P.R.China

By comparing micromorphological features of irrigated and non-irrigated soils in guanzhong areas, China, this paper tries to illustrate the influences of farming management methods on the soil-forming process. The micromorphology was observed under a petrographic microscope and its image was quantificationally measured by Nikon NISBR 2.2 software. Both irrigated and non-irrigated soils have the same soil profile pattern, Ap1- AP2- BC, but the former has a more obvious profile dissimilation. The minerals assemblage of soil profiles A and B are very similar, which is mainly composed of Q and P1. Compared with non-irrigated soil, grains of irrigated soil remarkably decrease in length, area, eqdiameter, perimeter, elongation, roundness, and C/F10μm ratio; voids are characterized by more regular void shape and more smooth void wall; there is more abundant residual clay and small amount of illuvial clay. All results in this study suggest that the farming management method has influences on soil profile dissimilation and micromorphology. Agricultural irrigation could strengthen the degree of weathering, make smaller and rounder soil grains, cause a significant increase of residual clay and appearance of illuvial clay. But no significant change has been observed in the minerals assemblage of coarse grains.

关键词： micromorphology irrigation guanzhong areas

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Micromorphological Features of Old Cultivated and Modern Soils in guanzhong areas, Shaanxi Province, China

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Agricultural Sciences in China 2006年第9期5卷 691-699页

作者： PANG Jiang-li HU Xuan-er HUANG Chun-chang Zhang Xu College of Tourism and Environmental Sciences/Northwest Research Center for Historical Environment and Socio-Economic Development Shaanxi Normal University Xi＇an 710062 P.R.China College of Foreign Languages Shaanxi Normal University Xi＇an 710062 P.R.China College of Tourism and Environmental Sciences Shaanxi Normal University Xi＇an 710062 P.R.China

Using the data obtained from the LGT soil profile, this article attempts to illustrate the process of modem soil formation in the guanzhong areas and its micromorphological features. The micromorphology is observed under a petrographic microscope, and its image is quantitatively measured by LEICAL Qwin 2.6 software. Micromorphological observations of the thin sections show that the assemblage of minerals in different horizons is very similar, which is mainly composed of Q and P1. However, there are obvious differences in C/F15μm ratio, mineral content, and coarse features. The pedofeatures is mainly composed of clay, calcite, and amorphous Fe. Ap horizon is characterized by abundant needleshaped secondary calcite, secondary clay, and earthworm fecal pellet. BC horizon is characterized by a large quantity of secondary calcite with various shapes. Bt1and Bt2 horizons are characterized by abundant clay hypocoatings and a small quantity of secondary calcite. All the results of this research suggest that Earth-cumulic Orthic Anthrosols consist of both the upper Ap horizon, which cause loessal dung and eolian dust deposition, and cultivation occurs simultaneously during the process of Ap horizon-formation, and the lower BC horizon, which is aeolian sedimentary at the time of relative aridity during late Holocene.

关键词： micromorphology old cultivated soils modem soil guanzhong areas

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