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Negative responses of ecosystem autotrophic and heterotrophic respiration to experimental warming in a Tibetan semi-arid alpine steppe
Zhao, JX (Zhao, Jingxue)1; Tian, LH (Tian, Lihua)2; Wei, HX (Wei, Haixia)3; Sun, FD (Sun, Feida)4; Li, RC (Li, Ruicheng)1
Source PublicationCATENA
2019
Volume179Issue:0Pages:98-106
DOI10.1016/j.catena.2019.04.002
Abstract

Evaluating the responses of ecosystem respiration (Re) and its components to climate change is crucial for predicting terrestrial carbon cycling, particularly for the alpine grassland ecosystems. However, effects of climatic warming on ecosystem heterotrophic respiration (Rh) and autotrophic respiration (Ra) remain poorly understood in semi-arid alpine grasslands. A field manipulative experiment was conducted to investigate the effects of experimental warming on total Re, Rh and Ra in a Tibetan semi-arid alpine steppe during growing seasons of 2013 and 2014. Our results showed that warming decreased seasonal Re, Rh and Ra by 29%, 37% and 13%, respectively. However, warming tended to increase the contribution of Ra to Re (Ra/Re) but decrease that of Rh to Re (Rh/Re). Negative responses of Re was closely related to the changes in plant biomass and soil microbial biomass carbon. The apparent Q(10) values of Ra were higher than those of Re and Rh, with the Q(10) values ranked as Ra > Re > Rh. Warming decreased the apparent Q(10) values of Re and the two components. Our results emphasize that Re and its components respond negatively to experimental warming, and soil carbon loss has the potential to be less under future climatic warming in the Tibetan semi-arid alpine steppe.

Subject AreaEcology Environmental
WOS IDWOS:000468716800010
Language英语
Indexed BySCI
KeywordLarge Altitudinal Gradient Soil Respiration Climate-change Temperature Sensitivity Terrestrial Ecosystems Permafrost Region Co2 Exchange Carbon-cycle Meadow Plateau
WOS Research AreaGeology ; Agriculture ; Water Resources
WOS SubjectGeosciences, Multidisciplinary ; Soil Science ; Water Resources
Cooperation Status国际
ISSN0341-8162
Department高寒生态重点实验室
URL查看原文
PublisherELSEVIER
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9222
Collection图书馆
Corresponding AuthorZhao, JX (Zhao, Jingxue)
Affiliation1.Peking Univ, Coll Urban & Environm Sci, Dept Ecol, Key Lab Earth Surface Proc,Minist Educ, 5 Yiheyuan Rd, Beijing 100871, Peoples R China;
2.Southwest Minzu Univ, Inst Qinghai Tibetan Plateau, Chengdu 610041, Sichuan, Peoples R China;
3.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol & Biodivers, Beijing 100101, Peoples R China;
4.Sichuan Agr Univ, Anim Sci & Technol Coll, Dept Grassland Sci, Chengdu 611130, Sichuan, Peoples R China.
Recommended Citation
GB/T 7714
Zhao, JX ,Tian, LH ,Wei, HX ,et al. Negative responses of ecosystem autotrophic and heterotrophic respiration to experimental warming in a Tibetan semi-arid alpine steppe[J]. CATENA,2019,179(0):98-106.
APA Zhao, JX ,Tian, LH ,Wei, HX ,Sun, FD ,&Li, RC .(2019).Negative responses of ecosystem autotrophic and heterotrophic respiration to experimental warming in a Tibetan semi-arid alpine steppe.CATENA,179(0),98-106.
MLA Zhao, JX ,et al."Negative responses of ecosystem autotrophic and heterotrophic respiration to experimental warming in a Tibetan semi-arid alpine steppe".CATENA 179.0(2019):98-106.
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