Dissertation > Environmental science, safety science > The basic theory for the Environment and Science > Environmental Earth Science

Analysis about Plant Evolution Characteristics and Tests of Soil Properties on Horqin Sandy Land

Author ShiXiaoHong
Tutor LiChangYou;LiuTingZuo
School Inner Mongolia Agricultural University
Course Agricultural Soil and Water Engineering
Keywords Horqin Sandy Land SPAC system Surface environment Groundwater level Soil physical and chemical properties Vegetation succession Soil moisture characteristics
Type Master's thesis
Year 2004
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Horqin sandy land in the study area, and laid a total of 172 survey test points. Different terrain conditions landform type area in June 2002 to November were wild vegetation conditions, the root zone of the plant root development status of the soil layer and vegetation moisture field survey of the status of trial, and take soil samples were soil physical and chemical properties, soil nutrient status indoor experiment. Accordingly, the analysis of the following results: 1) Most of the Horqin sandy soils belong to the high risk of wind erosion of soil, its mechanical composition, physical and chemical properties in different landform types there are significant differences and has a regular variation characteristics. 2) the sandy different landform types of vegetation succession series is divided into: ① sand (2) wet ③ abandoned land ④ halophytes, ⑤ grazing 6 ⑥ natural forest succession series. The main factors affecting the vegetation succession climatic conditions change, the competition itself between external conditions and plant nutrient dynamics of soil moisture regional vegetation distribution characteristics, the interference of human factors, grazing pressure gradient, the internal factors of the survival of the fittest. 3) Horqin sandy land the different landforms type District soil moisture spatial variability of soil properties, the surface plant morphology, distribution of underground plant roots, precipitation, evaporation, and groundwater depth. Groundwater shallow fixed semi-fixed dunes trends moisture content, the soil layer above the water table can be divided into four changes with. The groundwater depth fixed semi-fixed sand dunes of the overall soil moisture trend is gradually increasing from top to bottom. Mobile dunes 180cm depth below the surface, the overall trend of soil moisture within the ground surface down gradually increased to peak point, down steady or slowly decreases 180cm deep around a relatively dry dry sand layer, and then gradually increase was unsaturated changes increasing trend. Affected by desertification the longitudinal section Shangdianzi soil can be divided into four regions. Pasture Land is not dune erosion can be divided into three regions, that is, there is no surface dry sand area. In shallow groundwater conditions, soil moisture sources for precipitation recharge and groundwater recharge water through capillary rise, a major source of groundwater depth of soil moisture in the larger dunes as precipitation and condensed water recharge.

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