| 其他摘要 | Because of serious soil erosion and the development of long-term use unreasonably, serious degradation of land resources, broken terrain, serious damage to vegetation, degradation of plant, rapid recession of ecosystem productivity and function, loess hilly gully region belong to ecologically fragile region. In recent years, with the acceleration of the pace of industrial restructuring and raise the level of agricultural intensification, fertilizer, pesticide and other facilities of a large number of inputs, as well as the rapid development of agriculture on the soil with a heavy impact on the environment, a serious threat to the local soil environment and facilities of agricultural production sustainable development. Papers in the loess plateau hilly region of Ansai county in the study area, the use of field sampling and laboratory methods of combining the different land-use patterns of soil physical and chemical properties were studied in order to be used to evaluate different land hilly area of loess hilly gully region the quality of the use of model changes in soil fertility at the same time, through the measurement of soil N, C of the vertical distribution of soil characteristics, evaluation of different land use patterns of effects of soil environment. Analysis of soil caused which soil due to fertilizer NO3--N in the soil profile. Loess hilly gully region that economic and social development of the agricultural use of the theory and technical support. The results showed that:(1) Because of Samples collected at the same region, in the different land use patterns so the soil bulk density, soil porosity, soil pH of the difference is not great. However, due to farming methods and the different irrigation methods, different land-use patterns of soil moisture and mechanical components will have some differences, solar greenhouse, arched shed and cash crops and soil moisture content of the clay content was significantly higher than on farmland, and apple grassland.(2) The study area of the soil organic matter, greenhouse highest, followed by grass and other land-use pattern of the lower. The study area available soil nitrogen and soil nutrients, the highest solar greenhouse, lawn minimum, the other is not very different from land-use patterns.(3) In the loess hilly gully region and gully region of the greenhouse highest mass index of soil fertility, the fertility of farmland minimum value mass index. Mass index values from the soil fertility can be seen in different land use patterns of different productivity, arched shed and greenhouse agriculture significantly higher than those with less manual management of farmland and apple. Loess hilly gully region soil and climate conditions are relatively poor, so after returning the quality of the grassland soil fertility index value was also low.(4) Soil NO3--N accumulation in soil fertility mass index as an increase in value has increased significantly. Soil clay content, soil moisture, soil available N is affected soil NO3--N accumulation in the three most important factors to improve the soil texture, irrigation control, and control the application amount of nitrogen is the most direct control over the soil NO3--N accumulation method. |
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