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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, Chengjun1; Chen, Leiyi; Ding, Jinzhi2; Cheng, Xiaoli3; Robinson, David4 | |
2015 | |
发表期刊 | FUNCTIONAL ECOLOGY |
ISSN | 0269-8463 |
卷号 | 29期号:6页码:839-848 |
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. |
关键词 | alpine ecosystems carbon cycle carbon-climate feedback soil organic carbon stable carbon isotope |
学科领域 | Ecology |
DOI | 10.1111/1365-2435.12393 |
收录类别 | SCI |
语种 | 英语 |
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) |
WOS记录号 | WOS:000357737500013 |
出版者 | WILEY |
文献子类 | Article |
出版地 | HOBOKEN |
EISSN | 1365-2435 |
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 |
作者邮箱 | yhyang@ibcas.ac.cn |
作品OA属性 | Bronze |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | 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.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Peking Univ, Dept Ecol, Key Lab Earth Surface Proc, Minist Educ, Beijing 100871, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Wuhan Bot Garden, Key Lab Aquat Bot & Watershed Ecol, Wuhan 430074, Peoples R China 5.Univ Aberdeen, Inst Biol & Environm Sci, Aberdeen AB24 3UU, Scotland |
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. |
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