本文關(guān)鍵詞： 蒸散 降水 渦度相關(guān) 凈輻射 青藏高原　出處：《草地學(xué)報》2017年02期 　論文類型：期刊論文

【摘要】：為揭示三江源區(qū)退化高寒草甸水分收支變化特征,利用渦度相關(guān)和微氣象方法對青海省果洛州大武鎮(zhèn)退化高寒草甸生態(tài)系統(tǒng)的年蒸散變化進(jìn)行了定量研究,并探討了環(huán)境和生物因子對其影響。結(jié)果表明:年總蒸散量為481.9mm,年蒸散量約占年降水量的97%。生長季中日均蒸散量為2.3mm·d-1,而非生長季日均蒸散量僅為0.6mm·d-1。溫度與蒸散量呈明顯的指數(shù)關(guān)系;該區(qū)接收的太陽輻射較強,但凈輻射占太陽輻射的比例相對較低(46%),在非凍土?xí)r期,蒸散量與凈輻射呈線性關(guān)系;研究區(qū)降水量相對豐沛,與溫度和凈輻射相比,土壤含水量對蒸散的影響相對較小。本研究說明高寒草甸的退化加劇了生態(tài)系統(tǒng)的蒸散量,從而降低了生態(tài)系統(tǒng)涵養(yǎng)水分的能力,凈輻射和溫度是驅(qū)動三江源區(qū)退化高寒草甸生態(tài)系統(tǒng)蒸散最主要的環(huán)境因子。
[Abstract]:In order to reveal the variation characteristics of water budget of degraded alpine meadow in the source area of three rivers, the annual evapotranspiration of degraded alpine meadow ecosystem in Dawu Town, Guoluozhou, Qinghai Province was studied quantitatively by using vorticity correlation and micrometeorological method. The effects of environment and biological factors on the evapotranspiration were discussed. The results showed that the total annual evapotranspiration was 481.9 mm, and the annual evapotranspiration accounted for 97% of the annual precipitation. The average daily evapotranspiration in growing season was 2.3 mm 路d ~ (-1), while that in non-growing season was only 0.6 mm 路d ~ (-1). The temperature and evapotranspiration were only 0.6 mm 路d ~ (-1). There is an obvious exponential relationship; The solar radiation received in this area is stronger, but the ratio of net radiation to solar radiation is relatively low. In the non-frozen soil period, the evapotranspiration is linearly related to the net radiation, and the precipitation in the study area is relatively abundant, compared with temperature and net radiation. The effect of soil water content on evapotranspiration is relatively small. This study shows that the degradation of alpine meadow exacerbates the evapotranspiration of ecosystem and reduces the ability of ecosystem to conserve water. Net radiation and temperature are the main environmental factors driving the evapotranspiration of degraded alpine meadow ecosystem.
【作者單位】： 南開大學(xué)生命科學(xué)學(xué)院;水利部水資源管理中心;中國科學(xué)院西北高原生物研究所;
【基金】：國家自然科學(xué)基金委項目(31570478) 國家重點研發(fā)計劃(2016YFC0501905)資助
【分類號】：S812

【相似文獻(xiàn)】

相關(guān)期刊論文 前1條

1 黃中艷;謝國清;;基于GIS模擬云南潛在蒸散量的地理空間分布[J];西南農(nóng)業(yè)學(xué)報;2013年01期

相關(guān)碩士學(xué)位論文 前1條

1 劉藝俠;相同給水條件下額濟(jì)納流域主要自然景觀效益分析[D];內(nèi)蒙古師范大學(xué);2013年

，

本文編號：1508500