不同土地利用类型土壤含水率与热导率相关性研究

目的]研究自然条件下不同土地类型土壤含水率与热导率的相关性。方法]选取露天状态下农耕地、裸地、草地、灌木地4种土地利用类型作为供试地块,在0~15 cm深度土层取样,通过烘干法测量土壤含水率,利用非稳态探针热脉冲技术测量土壤热导率。结果]4种土地利用类型下,土壤含水率变化范围为12.79%~25.08%,土壤热导率的变化范围为0.481~1.291 W/(m·K);农耕地和裸地采样带相邻点间数据的波动性较大,灌木地和草地采样带相邻点间数据的连续性较好。结论]农耕地、裸地、草地、灌木地4种土地利用类型中,自然状态下的土壤含水率与热导率表现为正相关性关系。

Correlation between Soil Water Content and Thermal Conductivity in Different Land Use Types

Objective] To explore the correlation between soil water content and thermal conductivity in different land use types. Method] Four land use types in the open air were used as the test plots. Soil water content was measured at 0-15 cm layer by oven-drying method. Unsteady heat probe pulse technology was used to measure the soil thermal conductivity. Result] Under the four land-use types, change range of soil water content was 12. 79% -25. 08%;change range of soil thermal conductivity was 0. 481-1. 291 W/(m·K). The sampling data between adjacent sampling point in farm land and bare land showed higher fluctuation, while the sampling data in the shrub land and grass land had higher continu-ity. Conclusion] The soil water content and thermal conductivity in the four types of land utilization show a positive correlation relationship in the natural state.