摘要
以昆山市为例对苏南典型区土壤基本性质的时空变化进行了研究。结果表明:(1)与第二次土壤普查相比,该区土壤酸化严重,土壤上层pH值的平均值由7.20下降到6.42,土壤上层pH值小于6.0的样点多达36.51%;土壤有机质含量呈下降趋势,土壤上层有机质含量平均值由31.4 g/kg下降到28.3 g/kg,小于20 g/kg的土壤样品由0.56%上升到11.11%;速效磷含量总体上呈现明显的升高趋势,平均值由6.4mg/kg上升到89.1 mg/kg;阳离子交换量(CEC)由19.3 cmol/kg下降为17.8 cmol/kg。(2)不同功能区、不同地貌区及不同剖面层次的土壤基本性质存在较为明显的空间变化。
Spatial and temporal variability of soil basic properties in typical areas of southern Jiangsu province is studied. The following conclusions are obtained. （1） Compared to the second soil survey of China（1980）,soil acidification is severe ; soil average pH value of the upper layer declines from 7.20 to 6.42,pH value of 36.51% of the samples is less than 6.0,and that of 6.35% is even less than 5.0. Soil organism is in a declining trend,the average content of the upper soil organism declines from 31.4mg/kg to 28. 3mg/kg, soil samples with an organism content less than 20g/kg increase from 0. 56% to 11.11%. The available phosphorus shows an obvious increasing trend with average value increasing from 6.4mg/kg to 89. lmg/kg, soil samples with the available phosphorus content over than 20mg/kg increase from 0. 74% to 56. 66 %,and coefficient of variation reaches a high value of 164. 6%. CEC decreases from 19.3cmol/kg to 17.8cmol/kg. （2） In different function areas, the contents of organism and the clay（〈0.01mm%） have no significant variations in all kinds of function areas, pH of else area（mainly vegetable field） is significantly lower than the others, the available phosphorus of else area is higher than the other function area with an extremely significant level, the content of NH4-N of else area is higher than the others with a significant level, and gets an extremely significant level in areas related to chemical factories and aquiculture, CEC of the area of chemical factory is lower than the others with a significant level. （3） In different physiognomic areas, the contents of organism, available phosphorous and NH4-N have no significant variations in all kinds of physiognomic areas, pH of soil upper layer is significant in all kinds of physiognomic area, and pH of lake area in the south is the smallest（5.51）, lower than the low area in the north and the plain area in the middle with an extremely significant level,the lower layer pH of lake area in the south is significantly lower than the other two, CEC of lake area in the south（22.2cmol/kg） is higher than the other two with a significant level, the content of soil clay 〈 0. 01mm （%） is significant in different physiognomy, that of lake area in the south is higher both in upper layer and under layer, and higher than low area in the north and the plain area in the middle with an extremely significant level. （4） In different profile layers, soil basic properties vary much, pH-value increases with the increase of depth, and the contents of organism, available phosphorus, NH4-N and CEC decrease with the increase of depth.
出处
《地理研究》
CSCD
北大核心
2006年第2期303-310,共8页
Geographical Research
基金
国家重点基础研究发展规划(973)项目(2002CB410810)
关键词
经济快速发展区
土壤性质
时空变化
昆山市
region with rapid economic development
soil property
spatial and temporal variability
Kunshan city
