Alpine Grassland Soil Organic Carbon Stock and Its Uncertainty in the Three Rivers Source Region of the Tibetan Plateau
文献类型：期刊论文
| 作者 | Chang, Xiaofeng1,2; Wang, Shiping3; Cui, Shujuan2,4; Zhu, Xiaoxue2,4; Luo, Caiyun2; Zhang, Zhenhua2; Wilkes, Andreas5 |
| 刊名 | plos one
 |
| 出版日期 | 2014-05-12 |
| 卷号 | 9期号:5 |
| ISSN号 | 1932-6203 |
| 中文摘要 | alpine grassland of the tibetan plateau is an important component of global soil organic carbon (soc) stocks, but insufficient field observations and large spatial heterogeneity leads to great uncertainty in their estimation. in the three rivers source region (trsr), alpine grasslands account for more than 75% of the total area. however, the regional carbon (c) stock estimate and their uncertainty have seldom been tested. here we quantified the regional soc stock and its uncertainty using 298 soil profiles surveyed from 35 sites across the trsr during 2006-2008. we showed that the upper soil (0-30 cm depth) in alpine grasslands of the trsr stores 2.03 pg c, with a 95% confidence interval ranging from 1.25 to 2.81 pg c. alpine meadow soils comprised 73% (i.e. 1.48 pg c) of the regional soc estimate, but had the greatest uncertainty at 51%. the statistical power to detect a deviation of 10% uncertainty in grassland c stock was less than 0.50. the required sample size to detect this deviation at a power of 90% was about 6-7 times more than the number of sample sites surveyed. comparison of our observed soc density with the corresponding values from the dataset of yang et al. indicates that these two datasets are comparable. the combined dataset did not reduce the uncertainty in the estimate of the regional grassland soil c stock. this result could be mainly explained by the underrepresentation of sampling sites in large areas with poor accessibility. further research to improve the regional soc stock estimate should optimize sampling strategy by considering the number of samples and their spatial distribution. |
| 英文摘要 | alpine grassland of the tibetan plateau is an important component of global soil organic carbon (soc) stocks, but insufficient field observations and large spatial heterogeneity leads to great uncertainty in their estimation. in the three rivers source region (trsr), alpine grasslands account for more than 75% of the total area. however, the regional carbon (c) stock estimate and their uncertainty have seldom been tested. here we quantified the regional soc stock and its uncertainty using 298 soil profiles surveyed from 35 sites across the trsr during 2006-2008. we showed that the upper soil (0-30 cm depth) in alpine grasslands of the trsr stores 2.03 pg c, with a 95% confidence interval ranging from 1.25 to 2.81 pg c. alpine meadow soils comprised 73% (i.e. 1.48 pg c) of the regional soc estimate, but had the greatest uncertainty at 51%. the statistical power to detect a deviation of 10% uncertainty in grassland c stock was less than 0.50. the required sample size to detect this deviation at a power of 90% was about 6-7 times more than the number of sample sites surveyed. comparison of our observed soc density with the corresponding values from the dataset of yang et al. indicates that these two datasets are comparable. the combined dataset did not reduce the uncertainty in the estimate of the regional grassland soil c stock. this result could be mainly explained by the underrepresentation of sampling sites in large areas with poor accessibility. further research to improve the regional soc stock estimate should optimize sampling strategy by considering the number of samples and their spatial distribution. |
| WOS标题词 | science & technology |
| 类目[WOS] | multidisciplinary sciences |
| 研究领域[WOS] | science & technology - other topics |
| 关键词[WOS] | spatial variability ; forest soils ; china ; assessments ; patterns ; density ; topsoil ; scales ; pool |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000336653300082 |
| 公开日期 | 2014-12-19 |
| 源URL | [http://ir.nwipb.ac.cn/handle/363003/4231]  |
| 专题 | 西北高原生物研究所_中国科学院西北高原生物研究所 |
| 作者单位 | 1.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling, Peoples R China 2.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, Xining, Peoples R China 3.Chinese Acad Sci, Inst Tibetan Plateau Res, Lab Alpine Ecol & Biodivers, Beijing, Peoples R China 4.Univ Chinese Acad Sci, Beijing, Peoples R China 5.World Agroforestry Ctr East Asia Programme, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chang, Xiaofeng,Wang, Shiping,Cui, Shujuan,et al. Alpine Grassland Soil Organic Carbon Stock and Its Uncertainty in the Three Rivers Source Region of the Tibetan Plateau[J]. plos one,2014,9(5). |
| APA | Chang, Xiaofeng.,Wang, Shiping.,Cui, Shujuan.,Zhu, Xiaoxue.,Luo, Caiyun.,...&Wilkes, Andreas.(2014).Alpine Grassland Soil Organic Carbon Stock and Its Uncertainty in the Three Rivers Source Region of the Tibetan Plateau.plos one,9(5). |
| MLA | Chang, Xiaofeng,et al."Alpine Grassland Soil Organic Carbon Stock and Its Uncertainty in the Three Rivers Source Region of the Tibetan Plateau".plos one 9.5(2014). |
入库方式： OAI收割
来源：西北高原生物研究所
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