【摘要】：掌握土壤水分動態(tài)變化規(guī)律是綠洲地區(qū)水資源管理與生態(tài)建設(shè)的關(guān)鍵.本文在黑河中游綠洲與荒漠交錯地帶設(shè)置面積約50 km~2的研究區(qū)域,持續(xù)監(jiān)測2012—2014年間植被生長季節(jié)土壤水分含量,利用地統(tǒng)計分析與時間穩(wěn)定性分析探索土壤水分的時空分布特征.結(jié)果表明:黑河北岸綠洲-荒漠過渡帶土壤蓄水量8月最大、10月最小,0~2 m土層土壤平均蓄水厚度約367 mm.綠洲-荒漠過渡帶土壤水分梯度除受河流影響外,還與土地利用方式密切相關(guān).不同土地利用類型土壤蓄水量依次為農(nóng)地喬木林地灌木林地荒漠,農(nóng)地土壤蓄水量平均高出外圍荒漠土壤蓄水量300%以上.研究區(qū)內(nèi)各采樣點土壤水分時間穩(wěn)定性具有明顯的空間差異,不同土地利用類型土壤水分穩(wěn)定程度依次為灌木林地荒漠農(nóng)地喬木林地.河流對沿岸綠洲土壤水分的直接影響集中在3 km以內(nèi),在河岸綠洲與新墾沙地農(nóng)田之間存在一條土壤水分較為穩(wěn)定的樣帶,可以用于指示綠洲生態(tài)系統(tǒng)的發(fā)展與演變.
[Abstract]:It is the key to the management and ecological construction of water resources in oasis area to master the law of dynamic change of soil moisture. In this paper, a study area of about 50 km~2 was established in the Oasis and desert ecotone in the middle reaches of Heihe River to continuously monitor the soil moisture content in the vegetation growing season from 2012 to 2014. The temporal and spatial distribution characteristics of soil moisture were studied by geostatistical analysis and time stability analysis. The results show that the soil water storage in the oasis desert transitional zone on the north bank of Heihe River is the largest in August, and the average soil water storage thickness in October is about 367 mm.. The soil moisture gradient in the oasis-desert transitional zone is closely related to the land use patterns in addition to the influence of rivers. The order of soil water storage in different land use types is the desert of farmland Arbor woodland and shrub forest. The average soil water storage of farmland is more than 300% higher than that of peripheral desert soil. The temporal stability of soil moisture in different sampling sites was significantly different. The degree of soil moisture stability of different land use types was in turn shrub land desert farmland Arbor forest land. The direct effect of river on soil moisture in oasis is within 3 km. There is a stable soil moisture sample between riparian oasis and newly cultivated sandy land, which can be used to indicate the development and evolution of oasis ecosystem.
【作者單位】： 西北農(nóng)林科技大學(xué)資源環(huán)境學(xué)院;西北農(nóng)林科技大學(xué)黃土高原土壤侵蝕與旱地農(nóng)業(yè)國家重點實驗室;中國科學(xué)院地理科學(xué)與資源研究所生態(tài)系統(tǒng)網(wǎng)絡(luò)觀測與模擬重點實驗室;中國科學(xué)院地理科學(xué)與資源研究所陸地水循環(huán)與地表過程重點實驗室;
【基金】：國家自然科學(xué)基金項目(91025018,41530854)資助~~
【分類號】：S152.7

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