本文選題：高寒草甸 + 返青期��； 參考：《生態(tài)環(huán)境學(xué)報》2017年03期

【摘要】：分析青藏高原高寒草甸返青期土壤水分和溫度的變化以及相互關(guān)系是理解高寒草甸生態(tài)系統(tǒng)變化的重要基礎(chǔ)。為明晰青藏高原祁連山東部高寒草甸返青期的土壤溫度與水分變化規(guī)律,選擇祁連山東部海北高寒草甸為試驗區(qū),以實地測試與方差、相關(guān)及回歸分析相結(jié)合的方法研究了海北高寒草甸返青期土壤分層水分和溫度的動態(tài)變化。結(jié)果表明:(1)觀測期內(nèi),高寒草甸整個返青期表層0 cm及地表以下5、15、30、60和120 cm土壤各層平均溫度分別為10.47、4.11、3.28、1.76、0.80和0.51℃,表層0 cm地溫受氣溫變化影響最為顯著;返青早期各層土壤溫度均穩(wěn)定于0℃左右,返青中期各層土壤溫度迅速增加,返青中后期自上而下不同土壤層溫度逐漸降低;(2)表層、中層和深層土壤平均含水量分別為17.3%、20.6%和20.9%,中層和深層土壤水分含量較小;表層土壤含水量波動劇烈,在整個返青期呈逐漸下降趨勢,中層和深層土壤含水量連續(xù)增加,波動范圍小;(3)高寒草甸土層0~15 cm的土壤體積含水量與土壤溫度呈顯著負(fù)相關(guān),隨土壤平均溫度增加,土壤體積含水量逐漸降低;15~30、30~45和45~60 cm較深層土壤含水量與土壤平均溫度呈顯著正相關(guān),隨土壤深度增加其相關(guān)性也隨之增強。該研究可為理解青藏高原高寒草甸生態(tài)系統(tǒng)的變化規(guī)律和變化過程提供參考依據(jù),對高寒草甸的保護(hù)及可持續(xù)利用也具有重要意義。
[Abstract]:It is important to analyze the changes of soil moisture and temperature and their relationship between alpine meadow and alpine meadow ecosystem in Qinghai-Xizang Plateau.In order to understand the variation of soil temperature and water in the alpine meadow in the eastern Qilian Mountains of Qinghai-Xizang Plateau, the alpine meadow in the east of Qilian Mountains was selected as the experimental area, and the field test and variance were used.Correlation and regression analysis were used to study the dynamic changes of soil stratified water and temperature in the green stage of alpine meadow in Haibei.The results showed that during the observation period, the average temperature of 0 cm surface layer and 5151530 ~ (60) and 120 cm soil layer of Alpine meadow was 10.47 ~ 4.11 ~ 3.281.76 ~ 0.80 鈩，

本文編號：1742214