摘要
以重庆市主城九区城市绿地土壤为研究对象,在对其理化性状分析的基础上探讨其质量特征。结果显示,供试土壤p H值在4.5~8.8之间,酸性、中性土壤只占20.2%,与自然土壤酸碱性相比,有明显的石灰化趋势;土壤容重变幅为0.96~1.74 g/cm3,平均值为1.42 g/cm3,存在明显的土壤压实现象;土壤有机质含量为1.63~44.9 g/kg,平均值14.4 g/kg,其中小于10 g/kg的占36.5%;根据全国第二次土壤普查土壤肥力状况分级标准,72.4%土壤处于氮素营养缺乏,82.8%可能出现供磷不足;钾素处于中等水平,基本不缺乏。根据重庆市《栽植土壤质量标准》（DBJ/T50-044-2005）对重庆市主城区城市绿地土壤进行质量评价,结果显示,供试土壤肥力普遍较低,按得分分级可得优良（一级）土壤占8.7%,土壤质量尚可（二级）占44.4%,土壤质量较差（三级）占46.9%,其中专类公园绿地的表现出质量最差,三级土壤占61.9%。
The green space soil in nine main districts of Chongqing was studied to analyze the quality characteris- tics. The results indicated that the pH value in the collected soil samples ranges from 4. 5 to 8.8, in which acidic and neutral soil accounted for 20. 2 %,which is compared to the pH of natural soil, the collected soil samples are characteristic of obvious basified trends ; the bulk density varied from 0. 96 g/cm3 to 1.74 g/cm3, and the average value is 1.42 g/cm3. It is indicated that the soil compaction phenomenon is obvious ; the organic matter content in the studied soil samples ranges from 16.3 g/kg to 44. 9 g/kg,and the average value is 14.4 g/kg,the 36.5 % stud- ied soil is less than 10 g/kg. According to the grading standards in the second national soil fertility survey, the 72. 4 % studied in soil samples is nitrogen nutritional deficiencies, the 82.8 % soil samples are lack of phosphorus and potassium is medium level in the samples. On the basis of the planting soil quality standards in Chongqing city （DBJ/T50-044-2005）, the tested soil fertility is generally low. According to the grades, the first grade soil is 8.7 %, the 44. 4 % soil is the second grade, and the 46.9 % soil is classed into the third grade. The third grade soil is counted for 61.9 % of park green space.
出处
《贵州科学》
2015年第4期69-74,共6页
Guizhou Science
基金
重庆市自然科学基金项目:重庆市城市化进程中山地城市土壤质量特征及其演变机制-以重庆市为例(CSTC
2010BB134)
重庆市建委项目:<园林栽植土壤质量标准>修订(建标字2011第22号)
关键词
城市绿地
质量特征
评价
重庆市主城区
urban green space, quality characteristics, evaluation, the main districts in Chongqing
