区域土地利用方式变化对土壤性质影响研究——以土壤钾为例

选取经济发达区原锡山市作为研究区域,以1982年和2005年土壤速效钾作为研究对象,分析探讨不同时空状态下区域土地利用变化对土壤钾含量的影响,以期获得较长时空条件下土壤质量对土地利用变化的响应。20年来,通过统计分析和独立样本t检验表明,原锡山市土壤速效钾含量增加了36.9mg/kg。变异函数分析表明,土壤速效钾的变异函数理论模型呈指数型,块金方差与基台值的比值、自相关阀值发生较大变化。kriging插值分析结果表明,土壤速效钾空间分布较简单,但空间变异明显。

Study on Land - use Changes and Its Effects on Soil Properties——A Case of Potassium

Land-use change may influence a variety of natural and ecological processes,including soil nutrient,soil moisture,soil erosion,land productivity and biodiversity.Land-use was an important component of global environmental change research.The major problem faced with the sustainable development in the former Xishan Region was the eco-environmental one.With its dense population and developed economy,SXC region had a long history of land-use.Since 1982,great changes took place in society and economy in former Xishan City,which caused the corresponding land-use change.The land-use changed both by nature and human in former Xishan City.Compared with the economic policy,nature factor was stable.The new database of available potassium were established by laboratory analyzing of the samples collected in 2005 and by compared with data of 1982.Through application of geo-statistics combined with GIS,the spatio-temporal variability of available potassium in former Xishan City between 1982 and 2005 was analyzed.Independent geostatistics that available potassium increased 36.9mg/kg,semivariogram modeling indicated that the model for available potassium in former Xishan City remain unchanged,however the ratio of Nugget/Sill and the correlation threshold changed significantly.The result of Kriging interpolation indicated that,in both 1982 and 2005,the spatial pattern of available potassium were simple,but the patterns changed significantly.