Edaphic rather than climatic controls over C-13 enrichment between soil and vegetation in alpine grasslands on the Tibetan Plateau

doi:10.1111/1365-2435.12393

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	Edaphic rather than climatic controls over C-13 enrichment between soil and vegetation in alpine grasslands on the Tibetan Plateau
	Yang, Yuanhe ; Ji, Chengjun 2; Chen, Leiyi ; Ding, Jinzhi 1; Cheng, Xiaoli 5; Robinson, David 4
刊名	FUNCTIONAL ECOLOGY
	2015
卷号	29 期号:6 页码:839-848
关键词	alpine ecosystems carbon cycle carbon-climate feedback soil organic carbon stable carbon isotope
ISSN号	0269-8463
DOI	10.1111/1365-2435.12393
文献子类	Article
英文摘要	1. Soil organic carbon (SOC) dynamics is crucial for evaluating ecosystem carbon balance and its feedback to climate warming. However, it is difficult to detect statistically significant changes in SOC stock over short-time period due to its large pool size, slow turnover time and huge spatial heterogeneity. Stable isotopic measurements, such as Delta delta C-13 (i.e. the difference of natural abundance of C-13 and C-12 (delta C-13) between surface soils and source plants) and its variations along environmental gradients provide an alternative approach inferring soil carbon dynamics over broad geographical scale. However, current isotopic evidence is primarily derived from temperate and tropical regions, with very limited measurements available in alpine regions. 2. Here, we examined spatial variations of Delta delta C-13 in alpine grasslands on the Tibetan Plateau, using large-scale isotopic measurements obtained from consecutive field samplings. We aimed to test whether previously observed isotopic patterns in temperate and tropical regions still hold true in alpine regions and whether climatic or edaphic variables regulated large-scale patterns of C-13 enrichment between soil and vegetation in alpine ecosystems. 3. Our results showed that topsoil stable carbon isotope composition in alpine steppe and meadow ranged from -26.1 parts per thousand to -19. 7 parts per thousand and from -25.7 parts per thousand to -22.2 parts per thousand, with an average of -23.7 parts per thousand and -24.1 parts per thousand, respectively. As previously observed in temperate forests, soil delta C-13 exhibited linear increases with plant delta C-13 in alpine grasslands. 4. In contrast to earlier findings, our results revealed that edaphic rather than climatic factors regulated spatial variability of the Delta delta C-13 in high-altitude regions. Moreover, edaphic controls over Delta delta C-13 exhibited meaningful differences between alpine steppe and meadow. The Delta delta C-13 exhibited an initial increase and a subsequent decrease with soil carbon content in alpine steppe, but was negatively associated with silt content and carbon: nitrogen ratio in alpine meadow. 5. Our results confirmed the association between the delta C-13 of surface soils and vegetation across contrasting ecosystems, but revealed that edaphic rather than climatic variables were better explanations of C-13 enrichment between soil and vegetation at high altitudes. Changes in soil texture and substrate quality could therefore induce soil carbon dynamics in alpine ecosystems.
学科主题	Ecology
电子版国际标准刊号	1365-2435
出版地	HOBOKEN
WOS关键词	CARBON-ISOTOPE COMPOSITION ; ORGANIC-CARBON ; FOREST ; DELTA-C-13 ; TURNOVER ; PATTERNS ; STORAGE ; RATIOS ; DECOMPOSITION ; ALTITUDE
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
语种	英语
出版者	WILEY
WOS记录号	WOS:000357737500013
资助机构	National Basic Research Program of China on Global Change [2014CB954001, 2015CB954200] ; National Natural Science Foundation of China [31322011, 41371213] ; Thousand Young Talents Program
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/25900]
专题	植被与环境变化国家重点实验室
作者单位	1.Peking Univ, Dept Ecol, Key Lab Earth Surface Proc, Minist Educ, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 3.Univ Aberdeen, Inst Biol & Environm Sci, Aberdeen AB24 3UU, Scotland 4.Chinese Acad Sci, Wuhan Bot Garden, Key Lab Aquat Bot & Watershed Ecol, Wuhan 430074, Peoples R China 5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Yang, Yuanhe,Ji, Chengjun,Chen, Leiyi,et al. Edaphic rather than climatic controls over C-13 enrichment between soil and vegetation in alpine grasslands on the Tibetan Plateau[J]. FUNCTIONAL ECOLOGY,2015,29(6):839-848.
APA	Yang, Yuanhe,Ji, Chengjun,Chen, Leiyi,Ding, Jinzhi,Cheng, Xiaoli,&Robinson, David.(2015).Edaphic rather than climatic controls over C-13 enrichment between soil and vegetation in alpine grasslands on the Tibetan Plateau.FUNCTIONAL ECOLOGY,29(6),839-848.
MLA	Yang, Yuanhe,et al."Edaphic rather than climatic controls over C-13 enrichment between soil and vegetation in alpine grasslands on the Tibetan Plateau".FUNCTIONAL ECOLOGY 29.6(2015):839-848.