Precipitation rather than evapotranspiration determines the warm-season water supply in an alpine shrub and an alpine meadow

doi:10.1016/j.agrformet.2021.108318

	Precipitation rather than evapotranspiration determines the warm-season water supply in an alpine shrub and an alpine meadow
	Li, Hongqin 2,3; Zhang, Fawei 3,4,6; Zhu, Jingbin 3,7; Guo, Xiaowei 3; Li, Yikang 3; Lin, Li 3; Zhang, Leiming 5; Yang, Yongsheng 3; Li, Yingnian 3; Cao, Guangmin 3
刊名	AGRICULTURAL AND FOREST METEOROLOGY
	2021-04-15
卷号	300 页码:11
关键词	Eddy covariance techniques Evapotranspiration Water supply Bulk surface resistance Atmospheric evaporative demand Qinghai-Tibetan plateau
ISSN号	0168-1923
DOI	10.1016/j.agrformet.2021.108318
通讯作者	Zhang, Fawei(mywing963@126.com) ; Li, Yingnian(ynli@nwipb.cas.cn) ; Cao, Guangmin(caogm@nwipb.cas.cn)
英文摘要	Alpine 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.
资助项目	National 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]
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000635674500008
资助机构	National 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
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/161896]
专题	中国科学院地理科学与资源研究所
通讯作者	Zhang, Fawei; Li, Yingnian; Cao, Guangmin
作者单位	1.Natl Agr & Food Res Org, Inst Agroenvironm Sci, Tsukuba, Ibaraki 3058604, Japan 2.Luoyang Normal Univ, Coll Life Sci, Luoyang 471934, Henan, Peoples R China 3.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining 810001, Qinghai, Peoples R China 4.Chinese Acad Sci, Northwest Inst Plateau Biol, Qinghai Prov Key Lab Restorat Ecol Cold Reg, Xining 810001, Qinghai, Peoples R China 5.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 6.Chinese Acad Sci, Inst Sanjiangyuan Natl Pk, Xining 810001, Qinghai, Peoples R China 7.Zaozhuang Univ, Coll Tourism Resources & Environm, Zaozhuang 277100, Shandong, Peoples R China
推荐引用方式 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.