风沙区不同土地利用类型的土壤水分灰色关联分析

运用灰色关联分析法,对宁夏风沙区盐池县马儿庄村4种不同土地利用类型土壤水分的垂直变化和月变化动态进行分析.结果表明:不同类型土壤水分垂直变化规律不尽相同,中层(30～70 cm)与深层(70～100 cm)土壤水分变化态势的相似程度均较高,但相似程度柠条>天然草场>甘草>苜蓿,表层(0～30 cm)与深层(70～100cm)的灰色关联度最小,土壤水分变化态势差异最大;从各月土壤水分灰色关联度来看,甘草8～10月份土壤水分灰色关联度较大,土壤水分变化态势的相似程度较高,7月份的差异明显;柠条在9月份的灰色关联度达到了最小,其他各月相似度逐渐增大;而苜蓿和天然草场土壤水分灰色关联度波动很大,变化趋势为大-小-大-小.灰色关联分析法可以较好地反映不同土地利用类型土壤水分变化趋势的相似或相异程度.

Analysis on Grey Correlation Degree of Soil Moisture Content under Different Land Use Types in Wind-Blown Sand Area

In this paper,the grey correlation analysis is used to analyze the vertical and monthly dynamic change of soil moisture content under 4 land use types in a wind-blown sand area in Yanchi County,Ningxia Hui Autonomous Region of China.The results show that the vertical change of soil moisture content under different land use types are quite different,the similarity of soil moisture content in the middle layer(30～70 cm in depth)and the deeper layer(70～100 cm)is high,with an order of Caragana korshinskii land>natural grassland>Glycyrrhiza sp.land>Medicago sativa land.The grey correlation degree of soil moisture content between the top layer(0～30cm in depth)and the deeper layer(70～1 00 cm)was the lowest,and the difference of soil moisture content is the highest.In Glycyrrhiza sp.land,the grey correlation degree of soil moisture content and similarity of soil moisture content change are higher during the period from August to October,however it is quite different in July;in Caragana korshinskii land,the grey correlation degree is the lowest in September,and it increases gradually in other months;however,it fluctuates strongly in the change trend of high-low-high-low in Medicago sativa land and natural grassland.The method of grey correlation analysis can be used to ideally identify the similarity or dissimilarity of soil moisture content change under different land use types.