城乡结合部开发建设扰动土壤质量变化特征

Changes in Soil Quality of Disturbed Soil in Para-Urban Region as Affected by Exploitation and Construction

为揭示城乡结合部开发建设活动对土壤质量的影响，在广州市白云区调查采样，研究农用地开发建设扰动土壤的质量变化特征。结果表明，扰动土壤综合质量处于差级水平；土壤结构与剖面发育层次混乱，耕层缺失，底土或母质风化土成为土壤表层，土壤粗砾（含石块，〉2mm）含量显著增加；pH趋向强酸性或碱性，有机质含量减少，土壤养分（钾元素除外）含量缺乏，73％～93％的土壤样品的有机质和氮元素单质量系数〈0．9。

To investigate influences of exploitation and construction on soil quality in the para-urban area, soil samples were collected in Baiyun District, Guangzhou for characterization of changes in soil quality of the disturbed soil. Results indicated that the soil was low in quality with its soil structure damaged, profile disordered, plow layer lost and replaced by subsoil or weathered parent material, coarse gravel content remarkably increased, and pH tending to be either very low or very high. Being very low in organic matter and deficient in soil nutrients （except soil K）, about 73% to 93% of the soil samples had their single-factor soil quality coefficient less than 0.9 for organic matter and nitrogen.