川中丘陵区紫色土坡面土壤侵蚀过程中基本理化性质与磁化率的演变特征

发布时间：2018-03-13 04:06

  本文选题：紫色土　切入点：土壤侵蚀　出处：《四川农业大学学报》2017年03期 　论文类型：期刊论文

【摘要】：【目的】探索土壤侵蚀强度与磁化率(MS)之间的关系,为利用磁测法研究紫色土坡面侵蚀提供理论依据。【方法】通过土壤侵蚀序列方法,研究川中丘陵区紫色土在坡面侵蚀过程中基本理化性质与磁化率(MS)的演变特征。【结果】结果表明,随土壤侵蚀强度的增加,坡顶和坡中土壤基本理化性质的演变特征存在差异,坡中土壤要比坡顶土壤复杂。在坡顶以0~20 cm土壤层为主要营养物流失层,在坡中则以0~40 cm为主。不同侵蚀强度土壤与未侵蚀土壤相比较,只有坡顶土壤中有机质(SOM)的含量和坡中土壤全钾(TK)的含量达到显著差异,而土壤中其他的养分含量均未达到显著差异。土壤侵蚀对紫色土SOM、N和P的保存不利。表层土壤的MS随土壤侵蚀强度的增加有所下降,但并没有呈现出固定的模式,在本研究区很难借助MS来反演紫色土的侵蚀过程。【结论】川中丘陵地区土壤侵蚀主要体现在坡中,其次是坡顶,且土壤肥力受到显著影响。因此,应在该地区水土保持与生态修复时因地制宜选择适合的侧重点。
[Abstract]:[objective] to explore the relationship between soil erosion intensity and magnetic susceptibility (MS), and to provide a theoretical basis for the study of purple soil slope erosion by magnetic measurement. [methods] soil erosion sequence method was used. The evolution characteristics of the basic physicochemical properties and magnetic susceptibility (MSS) of purple soil in the middle of Sichuan hilly area during slope erosion were studied. [results] the results showed that with the increase of soil erosion intensity, the evolution characteristics of the basic physicochemical properties of the top and middle slope soil were different. The soil in the slope is more complex than that in the top of the slope. The soil layer of 0 ~ 20 cm is the main nutrient loss layer at the top of the slope, and the soil layer is mainly 0 ~ 40 cm in the slope. The soil with different erosion intensity is compared with the soil without erosion. Only the content of organic matter (SOM) in the top of the slope and the content of total potassium in the soil in the slope were significantly different. Soil erosion was unfavorable to the conservation of SOMN and P in purple soil. The MS of surface soil decreased with the increase of soil erosion intensity, but it did not show a fixed pattern. In this study area, it is difficult to invert the erosion process of purple soil by MS. [conclusion] soil erosion in the hilly area of central Sichuan is mainly reflected in the slope, followed by the top of the slope, and the soil fertility is significantly affected. In this area, soil and water conservation and ecological restoration should be selected according to local conditions.
【作者单位】： 内江师范学院地理与资源科学学院;西北大学城市与环境学院;
【基金】：国家自然科学基金青年科学基金项目(No.41401235) 国家级大学生创新实验项目(No.X201306)
【分类号】：S157.1
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本文编号：1604713