DOI: 10.1111/gcb.12886
论文题名: Soil carbon dynamics following land-use change varied with temperature and precipitation gradients: Evidence from stable isotopes
作者: Zhang K. ; Dang H. ; Zhang Q. ; Cheng X.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 7 起始页码: 2762
结束页码: 2772
语种: 英语
英文关键词: C isotopes
; Deforestation
; Land-use change
; Reforestation
; Soil C turnover
; Soil organic matter decomposition
Scopus关键词: carbon isotope
; decomposition
; deforestation
; land use change
; organic matter
; precipitation (climatology)
; reforestation
; soil carbon
; soil organic matter
; stable isotope
; temperature gradient
; China
; Qinling Mountains
英文摘要: Knowledge of soil organic matter (SOM) dynamics following deforestation or reforestation is essential for evaluating carbon (C) budgets and cycle at regional or global scales. Worldwide land-use changes involving conversion of vegetation with different photosynthetic pathways (e.g. C3 and C4 ) offer a unique opportunity to quantify SOM decomposition rate and its response to climatic conditions using stable isotope techniques. We synthesized the results from 131 sites (including 87 deforestation observations and 44 reforestation observations) which were compiled from 36 published papers in the literatures as well as our observations in China's Qinling Mountains. Based on the 13C natural abundance analysis, we evaluated the dynamics of new and old C in top soil (0-20 cm) following land-use change and analyzed the relationships between soil organic C (SOC) decomposition rates and climatic factors. We found that SOC decomposition rates increased significantly with mean annual temperature and precipitation in the reforestation sites, and they were not related to any climatic factor in deforestation sites. The mean annual temperature explained 56% of variation in SOC decomposition rates by exponential model (y = 0.0014e0.1395x) in the reforestation sites. The proportion of new soil C increased following deforestation and reforestation, whereas the old soil C showed an opposite trend. The proportion of new soil C exceeded the proportion of old soil C after 45.4 years' reforestation and 43.4 years' deforestation, respectively. The rates of new soil C accumulation increased significantly with mean annual precipitation and temperature in the reforestation sites, yet only significantly increased with mean annual precipitation in the deforestation sites. Overall, our study provides evidence that SOC decomposition rates vary with temperature and precipitation, and thereby implies that global warming may accelerate SOM decomposition. © 2015 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61599
Appears in Collections: 影响、适应和脆弱性
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作者单位: Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, The Chinese Academy of Sciences, Wuhan, China
Recommended Citation:
Zhang K.,Dang H.,Zhang Q.,et al. Soil carbon dynamics following land-use change varied with temperature and precipitation gradients: Evidence from stable isotopes[J]. Global Change Biology,2015-01-01,21(7)