江西山地土壤系統(tǒng)分類和垂直地帶性研究
[Abstract]:In order to determine the types of mountain soils in Jiangxi Province by quantitative method, four mountains with different longitude and latitude in Jiangxi Province were selected, and the samples of 18 profiles were collected by using the method of soil field investigation. According to the Chinese soil systematic Classification Retrieval (third Edition), the advanced classification units of soil system classification of Wugong Mountain, Jiugong Mountain, Jiuling Mountain and Xiangshan Mountain in Jiangxi Province were divided, and the differences of vertical zonality of different mountains were compared according to the results of systematic classification. The main results and conclusions are as follows: (1) the physical and chemical properties of 18 mountain soil profiles show a certain variation with the increase of mountain height. With the increase of altitude, the soil temperature decreased, the soil moisture status became constant wetting, the weathered degree decreased, the clay content in the soil decreased, and the degree of soil development was quite different. The content of soil organic carbon is high and increases with altitude, which is related to the change of hydrothermal conditions and vegetation types in mountainous areas. The soil above 850 m above sea level has the characteristics of humus. Soil cation exchange capacity increased at first and then decreased with the increase of altitude. The content of total iron and free iron in soil was significantly different, and the content of free iron decreased and the degree of iron free decreased with the increase of altitude. Most mountain soils have high free iron content or high degree of free iron, which has the characteristics of iron. The thickness of mountain soil layer is quite different, which is the result of the interaction of topographic slope and altitude. (2) according to the analysis of available data and environmental data, the main soil-forming processes of mountain soil in Jiangxi Province are humus accumulation process, aluminization process, adhesion process, embryonic weak development process and so on. According to the Chinese soil systematic Classification Retrieval (third Edition), the soils of Jiogong Mountain, Jiuling Mountain, Xiangshan Mountain and Wugong Mountain in Jiangxi Province can be divided into 5 diagnostic faults and 9 diagnostic characteristics, including: dark barren surface layer, low active iron-rich layer and so on. The diagnostic characteristics include 9 diagnostic characteristics, such as stone contact surface, quasi-stone contact surface, moist / constant humid soil moisture status, warm / hot soil temperature condition, iron characteristics and so on. Jiangxi mountain soils can be divided into 3 classes, 5 subclasses, 9 soils and 12 subclasses in systematic classification of iron-rich soil, leached soil and rudimentary soil. (3) according to the results of systematic classification, the vertical zonality of mountainous soil in Jiangxi Province is studied. The change of latitude leads to the change of vertical band spectrum structure of mountain soil. With the increase of latitude, the altitude of the same subclass decreased with the increase of latitude, which was consistent with the result of occurrence classification. Soil weathered at different latitudes at the same altitude may be divided into different soil classes.
【學(xué)位授予單位】:華中農(nóng)業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:S155
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