Moreover , there are good fitted power function relationship between thermal conductivity and soil water content , soil water suction and salt concentration . meanwhile , based on the measured data of soil water content and soil temperature distribution under temperature - controlled conditions , according to philip ' s empirical equation , through difference method , the water diffusivity under temperature gradient was calculated , which can be expressed as a power function of temperature 此外,研究表明,導(dǎo)熱率與土壤含水率、土壤水吸力、含鹽濃度之間均存在良好的冪函數(shù)關(guān)系;在取得一定溫控條件下的土壤水分與溫度分布實(shí)測(cè)資料的基礎(chǔ)上,根據(jù)philip經(jīng)驗(yàn)方程,通過差分法計(jì)算得出溫差作用下的水分?jǐn)U散率,該參數(shù)可表示為溫度的冪函數(shù)形式。