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Precipitation rather than evapotranspiration determines the warm-season water supply in an alpine shrub and an alpine meadow
Li, Hongqin1,2; Zhang, Fawei2,3,5; Zhu, Jingbin2,6; Guo, Xiaowei2; Li, Yikang2; Lin, Li2; Zhang, Leiming4; Yang, Yongsheng2; Li, Yingnian2; Cao, Guangmin2; Zhou, Huakun2,3; Du, Mingyuan7
2021-04-15
Source PublicationAGRICULTURAL AND FOREST METEOROLOGY
ISSN0168-1923
Volume300Pages:11
Corresponding AuthorZhang, Fawei(mywing963@126.com) ; Li, Yingnian(ynli@nwipb.cas.cn) ; Cao, Guangmin(caogm@nwipb.cas.cn)
AbstractAlpine regions are generally referred to as water towers for the lowlands, yet the water balance has not been quantified for alpine catchments with different vegetation types. This paper presented a multi-year time series of evapotranspiration (ET) and water supply (precipitation minus ET) during the warm-season (June to September), measured using eddy covariance techniques for an upper alpine shrub (3400 m) and for a lower alpine meadow (3200 m), on the northeastern Qinghai-Tibetan Plateau. The monthly ET for the shrub averaged 71.8 +/- 10.1 mm (Mean +/- SD), which was 22.7% lower than for the meadow. ET peaked at 89.0 +/- 3.0 mm for the shrub and at 113.9 +/- 2.6 mm for the meadow both in July. The monthly water supply was nearly neutral from June to July and represented a surplus in August and September at both sites. The mean warm-season ET and water supply were 287.0 +/- 17.6 mm and 59.6 +/- 16.3 mm for the shrub, and 352.2 +/- 15.7 mm and 22.5 +/- 32.5 mm for the meadow, respectively. Piecewise structural equation models showed that variability of daily ET was dominated more by net radiation (R-n) than by vapor pressure deficit (VPD) at both sites. However, net radiation was 32.6% higher for the shrub than for the meadow, but this did not drive higher ET for the shrub. This was explained by the difference in the energy partitioning strategy (Bowen ratio), which was attributable to the difference in the bulk surface resistance, rather than the difference in the climatological resistance (which is proportional to VPD/R-n). The seasonal and annual variability of water supply was determined by precipitation rather than by ET. The linear slopes of water supply with precipitation were all close to one, regardless of vegetation type. This suggested that the water yield efficiency was consistent at the two sites. Our results highlighted the different effects of vegetation type on ET and water supply for humid alpine regions. The lower ET loss and consequent higher water yield, but with less digestible forage in the shrub, would present a dilemma for the balance between water supply and forage production under current shrub expansion in alpine rangeland.
KeywordEddy covariance techniques Evapotranspiration Water supply Bulk surface resistance Atmospheric evaporative demand Qinghai-Tibetan plateau
DOI10.1016/j.agrformet.2021.108318
Indexed BySCI
Language英语
Funding ProjectNational Key RD Program[2017YFA0604801] ; National Natural Science Foundation of China[41730752] ; National Natural Science Foundation of China[41877547] ; Qinghai R&D Infrastructure and Facility Development Program[2018-ZJ-T09] ; Qinghai Innovation Platform Construction Project[2017-ZJ-Y20] ; Chinese Academy of Sciences-People's Government of Qinghai Province Joint Grant on Sanjiangyuan National Park Research[YHZX-2020-07]
Funding OrganizationNational Key RD Program ; National Natural Science Foundation of China ; Qinghai R&D Infrastructure and Facility Development Program ; Qinghai Innovation Platform Construction Project ; Chinese Academy of Sciences-People's Government of Qinghai Province Joint Grant on Sanjiangyuan National Park Research
WOS Research AreaAgriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS SubjectAgronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS IDWOS:000635674500008
PublisherELSEVIER
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/161897
Collection中国科学院地理科学与资源研究所
Corresponding AuthorZhang, Fawei; Li, Yingnian; Cao, Guangmin
Affiliation1.Luoyang Normal Univ, Coll Life Sci, Luoyang 471934, Henan, Peoples R China
2.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Qinghai, Peoples R China
3.Chinese Acad Sci, Northwest Inst Plateau Biol, Qinghai Prov Key Lab Restorat Ecol Cold Reg, Xining 810001, Qinghai, Peoples R China
4.Chinese Acad Sci, Synth Res Ctr Chinese Ecosyst Res Network, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
5.Chinese Acad Sci, Inst Sanjiangyuan Natl Pk, Xining 810001, Qinghai, Peoples R China
6.Zaozhuang Univ, Coll Tourism Resources & Environm, Zaozhuang 277100, Shandong, Peoples R China
7.Natl Agr & Food Res Org, Inst Agroenvironm Sci, Tsukuba, Ibaraki 3058604, Japan
Recommended Citation
GB/T 7714
Li, Hongqin,Zhang, Fawei,Zhu, Jingbin,et al. Precipitation rather than evapotranspiration determines the warm-season water supply in an alpine shrub and an alpine meadow[J]. AGRICULTURAL AND FOREST METEOROLOGY,2021,300:11.
APA Li, Hongqin.,Zhang, Fawei.,Zhu, Jingbin.,Guo, Xiaowei.,Li, Yikang.,...&Du, Mingyuan.(2021).Precipitation rather than evapotranspiration determines the warm-season water supply in an alpine shrub and an alpine meadow.AGRICULTURAL AND FOREST METEOROLOGY,300,11.
MLA Li, Hongqin,et al."Precipitation rather than evapotranspiration determines the warm-season water supply in an alpine shrub and an alpine meadow".AGRICULTURAL AND FOREST METEOROLOGY 300(2021):11.
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