黄土区刺槐林地土壤水分剖面的垂直分层

 为从蒸散耗水角度对黄土区刺槐林地土壤水分剖面进行垂直分层,在山西吉县蔡家川流域刺槐林地布设频域反射仪对0～150cm土层分层连续测定土壤水分,综合利用灰关联分析法和有序聚类法对各土层、不同时间蒸散耗水特性进行研究。结果表明:从蒸散耗水角度,黄土区刺槐林地土壤水分可垂直划分为地表植物蒸散耗水层(0～10cm)、林下灌木蒸散耗水层(10～40 cm)、刺槐蒸散耗水层(40～150cm);灰关联分析法和有序聚类法可以综合应用于土壤水分剖面垂直分层研究。分层方法数学理论基础较严密,取得的分层结果与现有相关研究结果基本一致,因此,有较高可信度,可为黄土区刺槐林地土壤水分研究提供参考。

Vertical stratification of soil moisture profile of Robinia pseudoacacia plantation in Loess Region

For dividing the vertical soil moisture profile of Robinia pseudoacacia stand from the perspective of evapotranspiration in Loess Region,soil water content surveys has been carried out in Caijiachuan small basin for observing the characteristics of evapotranspiration.By using gray relational analysis and sequential clustering method,soil moisture vertical stratification of Robinia pseudoacacia stand had been worked out.The results showed that： from the perspective of evapotranspiration,we can divide the vertical soil moisture profiles of Robinia pseudoacacia stand into surface plant consumption layer（0-10 cm）,understory shrub consumption layer（10-40 cm） and Robinia pseudoacacia consumption layer（40-150 cm）;gray relational analysis and sequential clustering method can be used in vertical stratification of soil moisture profile.This method is based on rigorous mathematical method,and the results consistent with existing conclusions,so this method has higher credibility,and can provide a new reference for soil moisture studying of Robinia pseudoacacia stand.