土埝表层养分聚集效应分析
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摘要
在黄土台塬地区,农民通常将土埝表面的土壤收集用作肥料。土埝经测定含有丰富的氮、钾等营养元素,研究土埝表层养分聚集效应对于生态化提高土壤质量以及土壤自我修复具有重要意义。在土埝的常见区域陕西省渭南市澄城县进行采样,分析不同年限(2年、6年和10年)、坡向(阴坡和阳坡)、垂直高度(距地面0.2 m、1 m和1.8 m)、深度(0～1 mm、1～3 mm、3～5 mm)等类型的土埝养分分布规律。结果表明:随着年限和距离地面高度的增加,在温度、光照、水分等自然因素的作用下,土壤全氮、有效磷和速效钾在土埝表层活化和富集;在阳坡上,土壤养分远远高于阴坡;随着采样垂直深度的增加,土埝养分含量减少,土埝表面土壤养分较高,土壤养分主要富集在土埝表层。
In loess tableland area, farmers usually collected the soil in the surface of terrace section(or called "terrace wall") as fertilizer. Studying the surface nutrient aggregation effect of terrace wall is of great significance for ecological improvement of soil quality and soil self-repair. Sampling in the common area of terrace wall,Chengcheng County, Weinan City, Shaanxi Province, analyzing different years(2 years, 6 years and 10 years), slope direction(shade slope and sunny slope), vertical height(0.2 m, 1 m and 1.8 m from the ground), depth(0-1 mm, 1-3 mm, 3-5 mm) and other types of soil nutrient distribution. The results showed: with the increase of age and ground level, soil nutrients, such as total nitrogen, available phosphorus and potassium were activated and accumulated in the surface of terrace wall under the effect of solar-thermal resources. In the sunny slope, soil nutrients were much higher than those in the shady slope caused by radiation. Soil nutrients were decreased with the increase of sampling vertical depth, most soil nutrients were found in the section surface, which proved soil nutrients were mainly accumulated in the surface of terrace wall.
In loess tableland area, farmers usually collected the soil in the surface of terrace section(or called "terrace wall") as fertilizer. Studying the surface nutrient aggregation effect of terrace wall is of great significance for ecological improvement of soil quality and soil self-repair. Sampling in the common area of terrace wall,Chengcheng County, Weinan City, Shaanxi Province, analyzing different years(2 years, 6 years and 10 years), slope direction(shade slope and sunny slope), vertical height(0.2 m, 1 m and 1.8 m from the ground), depth(0-1 mm, 1-3 mm, 3-5 mm) and other types of soil nutrient distribution. The results showed: with the increase of age and ground level, soil nutrients, such as total nitrogen, available phosphorus and potassium were activated and accumulated in the surface of terrace wall under the effect of solar-thermal resources. In the sunny slope, soil nutrients were much higher than those in the shady slope caused by radiation. Soil nutrients were decreased with the increase of sampling vertical depth, most soil nutrients were found in the section surface, which proved soil nutrients were mainly accumulated in the surface of terrace wall.
引文
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[8] 李勇,于广武,李晓冰,等.中、微量元素肥料发展的必要性及其前景分析[J].化肥工业,2013,40(4):1-2.
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[10] 张长保.降雨条件下黄土坡面土壤养分迁移特征试验研究[D].陕西杨凌:西北农林科技大学,2008.
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