EGI OpenIR
古尔班通古特沙漠蒸散时空变化规律
Alternative TitleSpatiotemporal changes of evapotranspiration in the Gurbantunggut Desert
胡顺军
Subtype硕士
Thesis Advisor胡顺军
2020-06-30
Degree Grantor中国科学院大学
Place of Conferral北京
Degree Discipline工程硕士
Keyword古尔班通古特沙漠 波文比-能量平衡法 水量平衡法 SEBAL 模型 梭梭群落 蒸散 Gurbantunggut Desert Bowen ratio energy balance method water balance method the SEBAL model Haloxylon ammodendron community evapotranspiration
Abstract古尔班通古特沙漠位于新疆天山北坡经济带南缘,脆弱的生态环境威胁着本地区经济发展和生产生活。 蒸散发是连接荒漠生态系统生态过程和水文过程的重要纽带。 本文利用波文比-能量平衡法、水量平衡法和 SEBAL 模型研究了古尔班通古特沙漠蒸散量的时空变化规律及其影响因素。 初步研究结论如下:( 1) 古尔班通古特沙漠南缘梭梭群落能量日变化特征因受不同天气条件的影响呈现显著差异。 日尺度上, 晴天、阴天能量支出以感热为主,雨天能量支出以潜热为主;月尺度上, 梭梭生长旺盛期能量支出以潜热为主,萌发期和枯落期以感热为主;旺盛期的净辐射和土壤热通量变化幅度大于萌发期和枯落期。( 2)不同生长阶段、不同天气条件下梭梭群落蒸散量的日内变化差异显著,梭梭旺盛期晴天和阴雨天蒸散明显高于萌发期和枯落期;梭梭群落蒸散日变化总体呈现旺盛期高于萌发期和枯落期; 2015、 2017、 2018 年蒸散月变化呈拱形特征, 2016 年蒸散月变化呈先增加后降低的趋势。( 3)各环境因子季节动态变化明显,气温、水汽压差、净辐射总体特征呈现单峰型变化趋势, 土壤热通量 4 ~ 7 月上升较为平缓, 7 月后下降趋势明显;晴天和阴天条件下,影响 10 min 尺度蒸散的最显著气象因子为净辐射通量, 日尺度的蒸散与气象因子相关性不显著;降水后的第一天较降水前一天的梭梭群落蒸散强烈。( 4) 2015 ~ 2018 年 4 ~ 10 月梭梭群落生长季土壤贮水量总体呈下降趋势,0 ~ 390 cm 土贮水量减少 7.83 ~ 68.57 mm;地下水利用量约 50 mm。( 5) 2015 ~ 2018 年 4 ~ 10 月古尔班通古特沙漠南缘梭梭群落蒸散量变化在200 ~ 280 mm。 水量平衡法与波文比-能量平衡法测定梭梭群落蒸散量的相对误差低于 30%。( 6) 古尔班通古特沙漠蒸散强度从东部至西部呈递减趋势,春、夏、秋季日平均蒸散变化在 0.35 ~ 0.46 mm 之间,冬季日平均蒸散为 0.19 mm。
Other AbstractThe Gurbantunggut Desert is located on the southern edge of the economic belton the northern slope of the Tianshan Mountains in Xinjiang. The fragile ecologicalenvironment threatens the economic development and production and life of theregion. Evapotranspiration is an important link connecting the ecological andhydrological processes of desert ecosystems. In this paper, the Bowen ratio-energybalance method, water balance method and SEBAL model are used to study thetemporal and spatial variation of the evapotranspiration of the Gurbantunggut desertand its influencing factors. The preliminary research conclusions are as follows:(1) The daily variation of energy of Haloxylon ammodendron community issignificantly different due to different weather conditions. On a daily scale, energyexpenditure in sunny and cloudy days is dominated by sensible heat, while energyexpenditure in rainy days is dominated by latent heat; On the monthly scale, theenergy expenditure of Haloxylon ammodendron is dominated by latent heat, and thesensible heat is mainly dominated by germination and withering; The net radiationand soil heat flux of Haloxylon ammodendron during the vigorous growth period weregreater than that of Haloxylon ammodendron growth and germination and witheringperiods.(2) The diurnal variation of Haloxylon ammodendron communityevapotranspiration in different growth stages and different weather conditions wassignificantly different. The evapotranspiration on the sunny and rainy days ofHaloxylon ammodendron was significantly higher than that during germination andwithering. The daily changes of evapotranspiration in Haloxylon ammodendroncommunity generally showed a vigorous period higher than the germination periodand the withering period. In 2015, 2017, and 2018, the monthly evapotranspirationchanges were arch-shaped, and in 2016, the monthly evapotranspiration changes first and then decreased.(3) Seasonal dynamic changes of environmental factors are obvious. The overallcharacteristics of air temperature, water vapor pressure difference, and net radiationshowed a single-peak change trend. The soil heat flux increased more slowly fromApril to July, and the downward trend was obvious after July. Under sunny andcloudy conditions, the most significant meteorological factor affecting the 10-minutescale evapotranspiration is the net radiant flux. The correlation between dailyevapotranspiration and meteorological factors is not significant. Theevapotranspiration of the Haloxylon ammodendron community was stronger on thefirst day after precipitation than on the day before precipitation.(4) From 2015 to April-October 2018, the total soil water storage of Haloxylonammodendron community showed a downward trend, and the water storage of 0 ~390 cm soil decreased by 7.83 ~ 68.57 mm. Groundwater utilization is about 50 mm.(5) From 2015 to April-October 2018, the evapotranspiration of Haloxylonammodendron community on the southern margin of the Gurbantunggut Desert variedfrom 200 to 280 mm. The relative error of the water balance method and the Bowenratio-energy balance method to measure the evapotranspiration of Haloxylonammodendron community is less than 30%.(6) The evapotranspiration intensity of the Gurbantunggut Desert showed adecreasing trend from east to west. The average daily evapotranspiration in spring,summer and autumn ranges from 0.35 to 0.46 mm, and the average dailyevapotranspiration in winter is 0.19 mm.
Subject Area环境工程
Language中文
Document Type学位论文
Identifierhttp://ir.xjlas.org/handle/365004/15429
Collection中国科学院新疆生态与地理研究所
研究系统
Affiliation中国科学院新疆生态与地理研究所
First Author Affilication中国科学院新疆生态与地理研究所
Recommended Citation
GB/T 7714
胡顺军. 古尔班通古特沙漠蒸散时空变化规律[D]. 北京. 中国科学院大学,2020.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[胡顺军]'s Articles
Baidu academic
Similar articles in Baidu academic
[胡顺军]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[胡顺军]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.