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文章在综合分析河北省丰宁坝上区域自然环境条件与土地利用特征的基础上,在暗栗钙土区域布设6个旱耕地样区,并在每个样区用梅花布点法布设12个观测样点,采集土壤样品并进行化验分析,依据《农用地质量分等规程》和综合比较研究法,综合评价了土壤风蚀对耕地质量等级的影响。结果表明,丰宁坝上区气候条件是边际耕地形成的主因;冬春季松散、干燥、裸露的耕地表土遭受风蚀,致使耕作层有机质、黏粒、粉粒含量分别减少了约46%、31%和26%;研究区耕地土壤风蚀平均速率为3.67mm/a,可使耕地质量等级每年降低0.75%,且随时间耕地质量等级将呈现加速下降趋势;现有的土壤质地划分方法难以刻画风蚀对表土层土壤质地的影响,亟待研发更为详细的土壤质地划分方案。
Based on a comprehensive analysis of the natural environmental conditions and land use characteristics of Fengningba area in Hebei province, six dryland plots were planted in the area of dark chestnut soil and 12 observations were made in each sample area Sampling and soil samples were collected for laboratory analysis. Based on “Regulations on Gradation of Agricultural Land” and comprehensive comparative study, the effects of soil erosion on the quality of cultivated land were comprehensively evaluated. The results show that the climatic conditions in Fengningba area are the main cause of marginal arable land formation. The loose, dry and uncultivated topsoil in winter and spring suffer from wind erosion, resulting in the reduction of organic matter, clay and silt content in farming layer by about 46% and 31% And 26% respectively. The average soil erosion rate of arable land in the study area was 3.67 mm / a, which could decrease the grade of arable land by 0.75% per year, and the quality grade of arable land decreased rapidly with time. The current soil texture classification method is difficult to characterize wind erosion Topsoil soil texture, the urgent need to develop more detailed soil texture program.