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以黄土高原水蚀风蚀交错区为研究区域,通过近1 000 km2的实地调查和7个典型剖面样品的采集,在主要土壤养分种类和环境因子测试分析的基础上,研究了土壤养分特征的空间变异和侵蚀环境的发展态势。得如下结论:(1)研究区各养分含量都较低,土壤养分含量对环境因子的综合响应特征体现出从东北向西南增加的规律。南线西段的养分含量高于北线的养分含量;(2)土壤水分含量与土壤粘粒含量呈正相关,粘粒含量与土壤养分含量呈正相关。西南段土壤水分含量高于东北段,在水蚀风蚀交错区的北线土壤含水量最低;(3)在水蚀风蚀交错区的中段,因严重的水土流失,呈现出土壤养分含量为全区最低;(4)整个区表现为东北段的干旱化程度和土壤粗化现象严重于西南段,而温度的上升则西南段高于东北段,侵蚀环境的演变具有东北段向南扩张和西南段向北移动的迹象。
Taking the ecotone between water erosion and erosion in the Loess Plateau as the research area, the spatial variability of soil nutrient characteristics was studied based on the field investigation of the main soil nutrients and the environmental factors through field survey of nearly 1 000 km2 and collection of seven typical section samples. And eroded the development of the environment. The conclusions are as follows: (1) The nutrient content of the study area is low, and the comprehensive response characteristics of soil nutrient content to environmental factors reflect the law increasing from northeast to southwest. Nutrient content in the western section of the southern line is higher than that in the northern line. (2) Soil moisture content is positively correlated with soil clay content, and clay content is positively correlated with soil nutrient content. The soil water content in the southwest section was higher than that in the northeast section, and the soil water content in the north line of the water erosion and wind erosion ecotone was the lowest. (3) In the middle section of the water erosion and wind erosion ecotone, soil nutrient content was the lowest in the whole area due to serious soil erosion. (4) The whole area shows the degree of aridification and soil coarsening in the northeastern segment are more serious than in the southwestern segment, while the temperature rise is higher in the southwest segment than in the northeast segment. The evolution of erosion environment has the expansion of the northeast segment to the south and the northwest segment to the north sign.