气候变化领域集成服务门户(CCPortal): Effects of site aridity and species on stand transpiration in high-elevation dryland ecosystems

CCPortal

DOI	10.1016/j.jhydrol.2024.130662
	Effects of site aridity and species on stand transpiration in high-elevation dryland ecosystems
	Wang, Fang; Zhang, Junzhou; Fonti, Patrick; Sun, Qipeng; Wang, Yuetong; Zhang, Fen; Wang, Yanfang; Yang, Jiqin; Gou, Xiaohua
发表日期	2024
ISSN	0022-1694
EISSN	1879-2707
起始页码	630
卷号	630
英文摘要	Climate change is altering regional aridity and species composition in dryland ecosystems. Understanding the effects of long-term increasing aridity and species-specific stomatal behaviors on transpiration is therefore important for water-resource forecasting. To assess the effects of site aridity levels and species on stand transpiration rate (E-s), we monitored sap flux density (J(s)) and relevant environmental parameters for 16 isohydric Picea crassifolia (spruce) and 14 anisohydric Juniperus przewalskii (juniper) trees over three growing seasons at four arid to semi-arid high-elevation sites on the Tibetan Plateau. Our results show that E-s was about 5-9 times higher in semi-arid sites than in arid sites, and about 6-9 times higher in spruce than in juniper. Spruce exhibited stronger stomatal regulation of transpiration than juniper. Soil water supply strongly promoted J(s) only for spruce in the arid environment (R-2 = 0.23), while at the other sites, J(s) was mostly controlled by atmospheric vapor pressure deficit (VPD) (R-2 > 0.82). However, increasing site aridity greatly reduced the sensitivities of both J(s) and canopy conductance to VPD, especially for juniper. We expect that in the transition from semi-arid to arid alpine forests, E-s will initially rise due to increasing VPD. However, in the long term, there may be a stronger decline in E-s since both the sensitivity of J(s) to VPD and the stand sapwood area will decrease. These findings could be used to reduce the impacts of climate change on water resources in high-elevation drylands.
英文关键词	Sap flow; Aridity gradient; Stomatal behavior; Qinghai Spruce; Qilian Juniper; Qilian Mountains
语种	英语
WOS研究方向	Engineering ; Geology ; Water Resources
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS记录号	WOS:001175866200001
来源期刊	JOURNAL OF HYDROLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/289782
作者单位	Lanzhou University; Swiss Federal Institutes of Technology Domain; Swiss Federal Institute for Forest, Snow & Landscape Research; Swiss Federal Institutes of Technology Domain; Swiss Federal Institute for Forest, Snow & Landscape Research; Lanzhou University
推荐引用方式 GB/T 7714	Wang, Fang,Zhang, Junzhou,Fonti, Patrick,et al. Effects of site aridity and species on stand transpiration in high-elevation dryland ecosystems[J],2024,630.
APA	Wang, Fang.,Zhang, Junzhou.,Fonti, Patrick.,Sun, Qipeng.,Wang, Yuetong.,...&Gou, Xiaohua.(2024).Effects of site aridity and species on stand transpiration in high-elevation dryland ecosystems.JOURNAL OF HYDROLOGY,630.
MLA	Wang, Fang,et al."Effects of site aridity and species on stand transpiration in high-elevation dryland ecosystems".JOURNAL OF HYDROLOGY 630(2024).