本文關(guān)鍵詞： 導(dǎo)熱率 青藏高原 砂礫石 含水量 孔隙度　出處：《冰川凍土》2017年02期 　論文類型：期刊論文

【摘要】：土壤導(dǎo)熱率是土壤的基本物理參數(shù)之一,也是陸面模式的重要輸入量,對(duì)研究土壤熱傳輸、水熱耦合運(yùn)移有重要意義。青藏高原由于獨(dú)特的地理環(huán)境備受學(xué)者關(guān)注,但目前常用的土壤水、熱屬性參數(shù)化方案僅僅考慮了沙土、粉土和黏土,就砂礫石重要性的認(rèn)識(shí)還不足,很少有模式模擬礫石對(duì)青藏高原多年凍土和高寒草地的影響。采用便攜式熱導(dǎo)儀(KD2 Pro,DECAGON,美國(guó))測(cè)量了青藏高原瑪多和北麓河兩地典型土壤在凍結(jié)和未凍結(jié)狀態(tài)下不同水分條件時(shí)的土壤導(dǎo)熱率,分析了砂礫石含量對(duì)土壤孔隙度的影響及凍結(jié)和未凍結(jié)狀態(tài)下,不同水分條件下砂礫石含量對(duì)土壤導(dǎo)熱率的影響。結(jié)果表明:當(dāng)含水量高于某一閾值時(shí),含水土壤凍結(jié)狀態(tài)下的導(dǎo)熱率高于未凍結(jié)狀態(tài)下的導(dǎo)熱率;土壤含水量對(duì)土壤導(dǎo)熱率影響顯著,導(dǎo)熱率隨著含水量的增加而增大,在含水量較小時(shí)變化更明顯;砂礫石含量比重多的土壤孔隙度較小,且砂礫石含量越大的土壤在凍結(jié)狀態(tài)下導(dǎo)熱率高。以上結(jié)果表明,砂礫石對(duì)土壤導(dǎo)熱率有顯著影響,在將來(lái)的模式模擬研究中必須考慮砂礫石對(duì)土壤熱屬性的影響,進(jìn)而提高土壤水熱過(guò)程模擬的精度。
[Abstract]:Soil thermal conductivity is one of the basic physical parameters of soil, and it is also an important input of land surface model, which is of great significance for the study of soil heat transfer and coupled transport of water and heat. The Qinghai-Tibet Plateau has attracted much attention due to its unique geographical environment. However, the commonly used parameterization schemes for soil water and thermal properties only consider sand, silt and clay, and the importance of sand and gravel is not well understood. Few models simulate the effects of gravel on permafrost and alpine grassland over the Qinghai-Xizang Plateau. A portable thermal conductivity instrument KD2 Pron DECAGON (USA) was used to measure the typical soils of Mado and Beilu in the Qinghai-Xizang Plateau under frozen and unfrozen conditions. Soil thermal conductivity under the same water condition, The effect of sand gravel content on soil porosity and the effect of sand gravel content on soil thermal conductivity under different moisture conditions were analyzed. The results showed that when the water content was higher than a certain threshold, The thermal conductivity of water-bearing soil was higher than that of non-frozen soil, and the soil moisture content had a significant effect on the soil thermal conductivity, and the thermal conductivity increased with the increase of water content, and the change of soil moisture content was more obvious when the water content was small. The porosity of the soil with more specific gravity of gravel is smaller, and the higher the content of gravel is, the higher the thermal conductivity of the soil is under the freezing state. The results show that the sand and gravel have a significant effect on the thermal conductivity of the soil. The influence of gravel on soil thermal properties must be taken into account in the future model simulation study, and the accuracy of soil hydrothermal process simulation should be improved.
【作者單位】： 中國(guó)科學(xué)院西北生態(tài)環(huán)境資源研究院;中國(guó)科學(xué)院大學(xué);南通大學(xué);
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃項(xiàng)目(2013CBA01807) 國(guó)家自然科學(xué)基金項(xiàng)目(41271089;41422102)資助
【分類號(hào)】：S152

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