气候变化领域集成服务门户(CCPortal): Effects of drought and heat on the productivity and photosynthetic characteristics of alpine meadow plants on the Qinghai-Tibetan Plateau

CCPortal

DOI	10.1007/s11629-020-6561-x
	Effects of drought and heat on the productivity and photosynthetic characteristics of alpine meadow plants on the Qinghai-Tibetan Plateau
	Ma Li; Zhang Zhong-hua; Yao Bu-qing; Ma Zhen; Huang Xiao-tao; Zhou Bing-rong; Xu Man-hou; Guo Jing; Zhou Hua-kun
通讯作者	Zhou, HK (通讯作者)，Chinese Acad Sci, Key Lab Restorat Ecol Cold Area Qinghai Prov, Northwest Inst Plateau Biol, Xining 810008, Peoples R China. ; Zhou, HK (通讯作者)，Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
发表日期	2021
ISSN	1672-6316
EISSN	1993-0321
起始页码	2079
结束页码	2093
卷号	18 期号:8
英文摘要	Alpine meadow plants, adapted to humid and cold environments, are highly sensitive to environmental factors such as drought and heat. However, the physiological responses of individual alpine meadow species to drought and heat stress remain unclear. In this study, four representative species of typical functional groups in an alpine meadow of the Qinghai-Tibet Plateau were selected as experimental materials. Heat (H1, H2), drought (D1, D2), and combined stress (D1H1, D2H2) treatments were implemented to reveal the biomass and physiological characteristics' response to a constant drought and heat environment. Our results showed that the leaf water content (LWC) of Kobresia humilis and Poa annua increased significantly under heat stress and the compound stress (P<0.05). The effect of a single factor on LWC was greater than that of multiple factors. The aboveground biomass (AGB) of Oxytropis ochrocephala and Saussurea pulchra decreased significantly under compound stress (P<0.05). The response patterns of the net photosynthetic rate (Pn) and transpiration rate (Tr) of K. humilis and P. annua under various stress treatments were similar; as were those of O. ochrocephala and S. pulchra. The stomatal conductance (Gs) variation in K. humilis, P. annua, O. ochrocephala, and S. pulchra were the same under three kinds of stress treatments. The photosynthetic characteristics were more sensitive to the effects of composite than those of single factors. The drought x heat x species treatment had a significant influence on various indexes except on height (Ht) and the belowground biomass (BGB) (P<0.01). Within a certain range, daytime temperature (DT) promoted the Ht and increased the LWC of the plants, while it inhibited their AGB and intercellular CO2 concentration (Ci). The Pn, Tr, and Gs were more sensitive to soil moisture than to DT. The results help improve understanding of the physiological response regularity of representative alpine meadow plant species to continuous drought and high temperature conditions at the species level, and provided experimental data and theoretical basis to identify the decisive factors of stress response.
关键词	HIGH-TEMPERATURE STRESS CLIMATE-CHANGE RESPONSES METABOLISM SALINITY RECOVERY IMPACT GROWTH YIELD
英文关键词	Alpine meadow; Drought stress; Heat stress; Productivity; Photosynthetic characteristics
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000681747700008
来源期刊	JOURNAL OF MOUNTAIN SCIENCE
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/253965
作者单位	[Ma Li; Zhang Zhong-hua; Yao Bu-qing; Ma Zhen; Huang Xiao-tao; Zhou Hua-kun] Chinese Acad Sci, Key Lab Restorat Ecol Cold Area Qinghai Prov, Northwest Inst Plateau Biol, Xining 810008, Peoples R China; [Zhou Bing-rong] Qinghai Inst Meteorol Sci, Xining 810001, Peoples R China; [Xu Man-hou] Taiyuan Normal Univ, Jinzhong 030619, Peoples R China; [Ma Li; Zhang Zhong-hua; Yao Bu-qing; Ma Zhen; Huang Xiao-tao; Zhou Hua-kun] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Guo Jing] Qinghai Acad Social Sci, Xining 810000, Peoples R China
推荐引用方式 GB/T 7714	Ma Li,Zhang Zhong-hua,Yao Bu-qing,et al. Effects of drought and heat on the productivity and photosynthetic characteristics of alpine meadow plants on the Qinghai-Tibetan Plateau[J]. 中国科学院西北生态环境资源研究院,2021,18(8).
APA	Ma Li.,Zhang Zhong-hua.,Yao Bu-qing.,Ma Zhen.,Huang Xiao-tao.,...&Zhou Hua-kun.(2021).Effects of drought and heat on the productivity and photosynthetic characteristics of alpine meadow plants on the Qinghai-Tibetan Plateau.JOURNAL OF MOUNTAIN SCIENCE,18(8).
MLA	Ma Li,et al."Effects of drought and heat on the productivity and photosynthetic characteristics of alpine meadow plants on the Qinghai-Tibetan Plateau".JOURNAL OF MOUNTAIN SCIENCE 18.8(2021).