Arid
DOI10.1016/j.agrformet.2014.11.011
Ephemeral plants mediate responses of ecosystem carbon exchange to increased precipitation in a temperate desert
Huang, Gang1; Li, Yan1; Padilla, Francisco M.2
通讯作者Huang, Gang
来源期刊AGRICULTURAL AND FOREST METEOROLOGY
ISSN0168-1923
EISSN1873-2240
出版年2015
卷号201页码:141-152
英文摘要

The ecological consequences of increased precipitation on ecosystem carbon (C) exchange are gaining increasing concern, especially in the context of ongoing climate change in temperate deserts. In this study, a field manipulative experiment was conducted to assess the effects of increased precipitation and nitrogen (N) addition on net ecosystem C exchange (NEE) in a temperate desert in northwestern China during two years with contrasting precipitation patterns (2011 and 2012). Increased precipitation decreased ecosystem C release by nearly 50% in the wet year of 2011, whereas ecosystem C release was increased in the dry year of 2012 because of the disproportional stimulation of gross ecosystem productivity (GEP) and ecosystem respiration (ER) by increased precipitation. N addition had no impact on NEE because of the slight responses of both GEP and ER to N addition. During the wet year, most of the precipitation occurred during the growing season of ephemeral plants, which profoundly stimulated plant growth and led to a higher response of GEP than ER to increased precipitation. As a result, positive effects of increased precipitation on NEE occurred in this year. During the dry year, the majority of the precipitation fell post the ephemeral growing season and only a small increase in herb biomass was observed. However, the response of ER to increased precipitation was larger than that of GEP, leading to a more negative NEE in 2012, as compared to 2011. C release was thus stimulated by increased precipitation in 2012. Irrespective of precipitation treatment, N addition weakly decreased C release because of the negligible stimulation of GEP and ER, as well as the slight response of ephemeral biomass. The responses of NEE to increased precipitation showed no difference between interplant spaces and beneath the dominant shrubs because of the similar responses of plant growth, GEP and ER between sites. Overall, this study shows that the responses of NEE to projected increasing precipitation depend on the coupling of precipitation timing and plant growing season. (C) 2014 Elsevier B.V. All rights reserved.


英文关键词N deposition NEE Precipitation variability Plant life history Respiration Spatial heterogeneity
类型Article
语种英语
国家Peoples R China ; Spain
收录类别SCI-E
WOS记录号WOS:000347863900014
WOS关键词WINTER ANNUAL PLANTS ; TERRESTRIAL ECOSYSTEMS ; SONORAN DESERT ; NITROGEN LIMITATION ; CLIMATE-CHANGE ; SOIL CARBON ; NORTH CHINA ; HYDROLOGIC CONTROLS ; TEMPORAL DYNAMICS ; ANNUAL GRASSLAND
WOS类目Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS研究方向Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
来源机构中国科学院新疆生态与地理研究所
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/185562
作者单位1.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Xinjiang, Peoples R China;
2.Univ Almeria, Dept Agron, La Canada De San Urbano 04120, Almeria, Spain
推荐引用方式
GB/T 7714
Huang, Gang,Li, Yan,Padilla, Francisco M.. Ephemeral plants mediate responses of ecosystem carbon exchange to increased precipitation in a temperate desert[J]. 中国科学院新疆生态与地理研究所,2015,201:141-152.
APA Huang, Gang,Li, Yan,&Padilla, Francisco M..(2015).Ephemeral plants mediate responses of ecosystem carbon exchange to increased precipitation in a temperate desert.AGRICULTURAL AND FOREST METEOROLOGY,201,141-152.
MLA Huang, Gang,et al."Ephemeral plants mediate responses of ecosystem carbon exchange to increased precipitation in a temperate desert".AGRICULTURAL AND FOREST METEOROLOGY 201(2015):141-152.
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