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为了计算当前年内的农田风蚀量,该研究利用农田耕作层土壤粒度组成较均一,风蚀使表层可蚀性颗粒减少,不可蚀颗粒含量相对增加这一特点,通过比较一个风蚀季结束后,农田耕作层表层与下层可蚀性颗粒与不可蚀颗粒相对含量的变化,提出了一种估算当前年内土壤风蚀量和粉尘释放量的方法,并给出了风蚀量与粉尘释放量的计算公式。利用此方法对河北坝上地区主要农田类型土壤风蚀量和粉尘释放量进行计算。计算结果表明,2013年研究区农田风蚀量为960~5 700 g/(m2·a),平均为2 852.14 g/(m2·a),平均风蚀深度为0.21 cm/a,从强度上划分属于重度风蚀。农田平均粉尘释放量为768.16 g/(m2·a),约占农田平均风蚀量的29.00%。粉尘释放量与风蚀量之间有显著的线性相关关系,翻耕耙平地的风蚀量和粉尘释放量显著大于留茬地。该方法的估算结果与前人采用其他方法得到的结果以及实地观测得到的结果基本吻合。
In order to calculate the amount of wind erosion in farmland during the current year, this study used a uniform soil particle size composition of farmland tillage layers. Wind erosion reduced the surface erodable particles and increased the content of non-erodable particles. By comparing the characteristics of farmland tillage A method to estimate the amount of soil erosion and dust emission in the current year is proposed. The formula for calculating the amount of wind erosion and dust emission is also given. This method was used to calculate the amount of wind erosion and dust emission of main farmland types in Bashang area, Hebei Province. The calculation results show that the wind erosion amount of farmland in the study area in 2013 was 960-5 700 g / (m2 · a) with an average of 2 852.14 g / (m2 · a) and the average wind erosion depth was 0.21 cm / a. Severe wind erosion. The average amount of farmland dust emission was 768.16 g / (m2 · a), accounting for about 29.00% of the average farmland wind erosion. There was a significant linear correlation between the amount of dust emission and the amount of wind erosion, and the amount of wind erosion and dust emission on tillage rakes were significantly greater than that of stubble. The estimated results of this method are basically consistent with the results obtained by other methods and those obtained by field observations.