【摘要】：土壤溫度影響土壤發(fā)育與植被狀況,是反映脆弱生態(tài)系統(tǒng)環(huán)境狀況的基本參數(shù)。本文通過(guò)一年的實(shí)地觀測(cè),分析了拉薩典型灌叢草甸區(qū)土壤溫度特征及其在海拔梯度與深度層次上的變化規(guī)律。結(jié)果表明:(1)0~30 cm深度范圍,年內(nèi)土壤日均溫變化類似余弦曲線,平均值為2.94℃,年內(nèi)有147 d土壤低于0℃;一天內(nèi)土壤溫度變化類似正弦曲線,日溫差平均為2.80℃,夏季溫差大,秋季溫差小。(2)土壤年均溫與海拔符合線性關(guān)系,土壤年均溫隨海拔的變率為-0.63℃(100 m-1),夏季土壤溫度的海拔效應(yīng)較其他季節(jié)明顯;且海拔越高,土壤溫度波動(dòng)幅度越大。(3)土壤年均溫與深度呈冪函數(shù)關(guān)系;隨深度的增加,土壤溫度變率降低。20 cm是土壤溫度變化相對(duì)穩(wěn)定的淺土層。
[Abstract]:Soil temperature, which affects soil development and vegetation status, is the basic parameter to reflect the environmental condition of fragile ecosystem. Based on one year's field observation, the characteristics of soil temperature in typical shrub meadow area in Lhasa and its variation law at the level of elevation gradient and depth are analyzed. The results showed that: (1) in the depth range of 0 ~ 30 cm, the variation of soil daily average temperature in the year was similar to that of cosine curve, the average value was 2.94 鈩，

本文編號(hào)：2326516