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The effects of grazing and watering on ecosystem CO2 fluxes vary by community phenology
Han, Juanjuan1; Li, Linghao1; Chu, Housen3; Miao, Yuan4; Chen, Shiping1; Chen, Jiquan2
2016
发表期刊ENVIRONMENTAL RESEARCH
ISSN0013-9351
卷号144页码:64-71
摘要Grazing profoundly influences vegetation and the subsequent carbon fluxes in various ecosystems. However, little effort has been made to explore the underlying mechanisms for phenological changes and their consequences on carbon fluxes at ecosystem level, especially under the coupled influences of human disturbances and climate change. Here, a manipulative experiment (2012-2013) was conducted to examine both the independent and interactive effects of grazing and watering on carbon fluxes across phenological phases in a desert steppe. Grazing advanced or delayed phenological timing, leading to a shortened green-up phase (GrP: 23.60 days) in 2013 and browning phase (BrP: 12.48 days) in 2012 from high grazing, and insignificant effects on the reproductive phase (Rep) in either year. High grazing significantly enhance carbon uptake, while light grazing reduce carbon uptake in ReP. Watering only delayed the browning time by 5.01 days in 2013, producing no significant effects on any phenophase. Watering promoted the net ecosystem exchange (NEE), ecosystem respiration (ER), and gross ecosystem productivity (GEP) only in the GrP. When calculating the yearly differences in phenophases and the corresponding carbon fluxes, we found that an extended GrP greatly enhanced NEE, but a prolonged ReP distinctly reduced it. The extended GrP also significantly promote GEP. Increases in growing season length appeared promoting ER, regardless of any phenophase. Additionally, the shifts in NEE appeared dependent of the variations in leaf area index (LAI). (C) 2015 Elsevier Inc. All rights reserved.
关键词Human disturbances Phenology Carbon Desert steppe Grazing Water
学科领域Environmental Sciences ; Public, Environmental & Occupational Health
DOI10.1016/j.envres.2015.09.002
收录类别SCI
语种英语
WOS关键词CARBON SEQUESTRATION ; FLOWERING PHENOLOGY ; CHANGING CLIMATE ; PLANT-GROWTH ; LAND-COVER ; SOIL ; EVAPOTRANSPIRATION ; RESPIRATION ; RESPONSES ; DROUGHT
WOS研究方向Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号WOS:000366443200007
出版者ACADEMIC PRESS INC ELSEVIER SCIENCE
Special IssueSI
文献子类Article
出版地SAN DIEGO
EISSN1096-0953
资助机构National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31500403, 31229001] ; NSFNational Science Foundation (NSF) [1313761] ; China Postdoctoral Science FoundationChina Postdoctoral Science Foundation
作者邮箱jqchen@msu.edu
作品OA属性Bronze
引用统计
被引频次:9[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ibcas.ac.cn/handle/2S10CLM1/25235
专题植被与环境变化国家重点实验室
作者单位1.Nanjing Univ Informat Sci & Technol, Int Ctr Ecol Meteorol & Environm, Nanjing 210044, Jiangsu, Peoples R China
2.Chinese Acad Sci, Inst Bot, Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
3.Michigan State Univ, CGCEO Geog, E Lansing, MI 48824 USA
4.Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA
5.Henan Univ, Coll Life Sci, China & State Key Lab Cotton Biol, Key Lab Plant Stress Biol, Kaifeng 475004, Henan, Peoples R China
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GB/T 7714
Han, Juanjuan,Li, Linghao,Chu, Housen,et al. The effects of grazing and watering on ecosystem CO2 fluxes vary by community phenology[J]. ENVIRONMENTAL RESEARCH,2016,144:64-71.
APA Han, Juanjuan,Li, Linghao,Chu, Housen,Miao, Yuan,Chen, Shiping,&Chen, Jiquan.(2016).The effects of grazing and watering on ecosystem CO2 fluxes vary by community phenology.ENVIRONMENTAL RESEARCH,144,64-71.
MLA Han, Juanjuan,et al."The effects of grazing and watering on ecosystem CO2 fluxes vary by community phenology".ENVIRONMENTAL RESEARCH 144(2016):64-71.
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