不同用地类型的土壤磁性特征研究
[Abstract]:The cities in arid areas are the most concentrated and sensitive regions. Up to 2011, the urbanization rate in arid area reached 43.5%, which was in the middle stage of urbanization. With the increasing of urban population and the extension of urban land, the urban soil quality is under stress at the same time. This paper selects Urumqi and Karamay as research objects, and collects 45 surface soil samples from Urumqi city and 56 surface soil samples from Karamay city. The relevant magnetic parameters were measured by magnetic method and the particle size of soil was measured by dry sieve method. (SOM) content of organic matter and available nutrients (ammonium nitrogen (AN),) were measured by burning loss method and colorimetric method, respectively. Available potassium (AK) and available phosphorus (AP) content. The magnetic characteristics of soil under different land types, the distribution characteristics of soil magnetism on different soil particles and the relationship between soil magnetism and nutrient and soil particle size were analyzed. The main conclusions are as follows: (1) soil magnetic characteristics and environmental significance of different land use types 蠂 lf (low frequency mass magnetization) mean value relationship is as follows: traffic and transportation land, commercial land, forest land, public facilities. Land for residential use without construction, Among them transportation land and public service facilities appeared higher value. According to the analysis of soil magnetic characteristics of different land types, it was found that the content of low coercivity ferromagnetic minerals was dominant, and a small amount of antiferromagnetic minerals were found. The particle size analysis of soil magnetic minerals shows that the surface soil of each land type is dominated by multi-domain (MD) magnetic mineral granularity. There are a few single domain (SP) and stable single domain (SSD) particles magnetic minerals. (2) the magnetic distribution characteristics of soils with different particle sizes are in the same land type, and the magnetic parameters are low frequency mass susceptibility (蠂 lf),). The content of saturation isothermal remanent magnetic (SIRM) and soft residual magnetic (SoftIRM) gradually increased with the decrease of particle size. The rule of hard remanent magnetic (HIRM) content was only good on the unconstructed land. The frequency susceptibility (蠂 fd) decreased with the decrease of particle size. In the same particle size, the content of 蠂 lf,SIRM and SoftIRM in the construction land was higher than that in the agricultural land, but not in the construction land. But 蠂 fd was opposite. (3) the relationship between soil magnetism and nutrients was found to be positive correlation between soil 蠂 lf and AK, AK and 蠂 lf, in traffic land and non-construction land. (SIRM) and "soft" SoftIRM have positive correlation, which indicates that ferrous minerals have a certain relationship with the minerals of available potassium. There was a positive correlation between 蠂 fd and SOM in the total soil samples of Karamay, and there was a significant positive correlation between woodland and unconstructed land. 蠂 fd could be considered as the substitute index of SOM.
【学位授予单位】:新疆师范大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:F301.2
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