Seasonal variations and sources of the dew from stable isotopes in alpine meadows

NWIPB OpenIR

	Seasonal variations and sources of the dew from stable isotopes in alpine meadows
	Li, Jing; Zhang, Fawei; Du, Yangong; Cao, Guangmin; Wang, Bin; Guo, Xiaowei
	2023
发表期刊	HYDROLOGICAL PROCESSES
卷号	37 期号:9
摘要	The dew is closely related to the micro-use water of plants and the large-scale hydrological processes, its formation on grassland plays a vital role especially in maintaining the eco-hydrological cycle. We used structural equation modelling to investigate how environmental factors would affect dew formation on alpine graminoid-Kobresia meadow in northern Qinghai-Tibet Plateau. The stable isotope information of dew, ambient vapour, soil water, plant water, creek water and precipitation were tracked to explore the source of dew, the dew transport route of the six dominant species by Mix SIAR model. Our results showed that the frequency of dew on the graminoid-Kobresia meadow in 2020 and 2021 was 42.86% and 45.83%, respectively. Both atmospheric pressure (r = 0.4) and temperature (r = 0.382) showed significant positive effects dew formation while wind speed (r = -0.309) had a negative effect. The contribution rates of soil water, plant water and ambient water vapour to dew were 48.20 & PLUSMN; 5.46%, 38.30 & PLUSMN; 5.07%, and 13.50 & PLUSMN; 1.82%, respectively. The proportion of dew utilization in the dominant species had no significant species differences. Our results provided an improved understanding of dew formation based on isotope technology on alpine meadow in northern Qinghai-Tibet Plateau. The annual amount was about 37.9 & PLUSMN; 1.0 mm, acounting for 7.1% of precipitation. Atmospheric pressure (r = 0.4) and temperature (r = 0.382) showed significant positive effects dew formation while wind speed (r = -0.309) had a negative effect.Dew formation in the alpine graminoid and Kobresia meadow from soil water, plant water, and ambient water vapour to dew formation were 48.2 & PLUSMN; 5.5%, 38.3 & PLUSMN; 5.1%, and 13.5 & PLUSMN; 1.8%, respectively, showed an upward pathway of water vapor distillation from soil to leaves.The proportion of dew utilization by the dominant plants showed no significant species differences, the mean value was 10.5 & PLUSMN; 3.8%.image
收录类别	SCIE
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/61582
专题	中国科学院西北高原生物研究所
推荐引用方式 GB/T 7714	Li, Jing,Zhang, Fawei,Du, Yangong,et al. Seasonal variations and sources of the dew from stable isotopes in alpine meadows[J]. HYDROLOGICAL PROCESSES,2023,37(9).
APA	Li, Jing,Zhang, Fawei,Du, Yangong,Cao, Guangmin,Wang, Bin,&Guo, Xiaowei.(2023).Seasonal variations and sources of the dew from stable isotopes in alpine meadows.HYDROLOGICAL PROCESSES,37(9).
MLA	Li, Jing,et al."Seasonal variations and sources of the dew from stable isotopes in alpine meadows".HYDROLOGICAL PROCESSES 37.9(2023).