Patterns of Soil ~(15)N and Total N and Their Relationships with Environmental Factors on the Qinghai-Tibetan Plateau
文献类型：期刊论文
| 作者 | Zhou Lei; Song Minghua; Wang Shaoqiang; Fan Jiangwen; Liu Jiyuan; Zhong Huaping; Yu Guirui; Gao Lupeng; Hu Zhongmin; Chen Bin |
| 刊名 | PEDOSPHERE
 |
| 出版日期 | 2014 |
| 卷号 | 24期号:2页码:232 |
| 关键词 | desert steppe nitrogen isotope composition nutrient availability soil nitrogen |
| ISSN号 | 1002-0160 |
| 英文摘要 | The patterns of soil nitrogen (N) isotope composition at large spatial and temporal scales and their relationships to environmental factors illustrate N cycle and sources of N, and are integrative indicators of the terrestrial N cycle and its response to global change. The objectives of this study were: i) to investigate the patterns of soil N content and natural abundance of ~(15)N (δ~(15)N) values in different ecosystem types and soil profiles on the Qinghai-Tibetan Plateau; ii) to examine the effects of climatic factors and soil characteristics on the patterns of soil N content and soil δ~(15)N values; and iii) to test the relationship between soil δ~(15)N values and soil C/N ratios across ecosystems and soil profiles. Soil profiles were sampled at 51 sites along two transects 1 875 km in length and 200 km apart and distributed in forest, meadow and steppe on the Qinghai-Tibetan Plateau. Each site was sampled every 10 cm from a soil depth of 0 to 40 cm and each sample was analyzed for soil N content and δ~(15)N values. Our results indicated that soil N and δ~(15)N values (0-40 cm) in meadows were much higher than in desert steppe. Soil N decreased with soil depth for each ecosystem, while variations of soil δ~(15)N values along soil profiles were not statistically significant among most ecosystems but for mountain meadow, lowland meadow, and temperate steppe where soil δ~(15)N values tended to increase with soil depth. The parabolic relationship between soil δ~(15)N values and mean annual precipitation indicated that soil δ~(15)N values increased with increasing precipitation in desert steppe up to 500 mm, and then decreased with increasing precipitation across all other ecosystems. Moreover, the parabolic relationship between δ~(15)N values and mean annual temperature existed in all individual ecosystem types. Soil N and δ~(15)N values (0-40 cm) increased with an increase in soil silt and clay contents. Furthermore, a threshold of C/N ratio of about 11 divided the parabolic relationship between soil δ~(15)N values and soil C/N ratios into positive (C/N 11) parts, which was valid across all ecosystems and soil profiles. The large explanatory power of soil C/N ratios for soil δ~(15)N values suggested that C and N concentrations, being strongly controlled by precipitation and temperature, were the primary factors determining patterns of soil δ~(15)N on the Qinghai-Tibetan Plateau. |
| 语种 | 英语 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/193227]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 作者单位 | 中国科学院地理科学与资源研究所 |
| 推荐引用方式 GB/T 7714 | Zhou Lei,Song Minghua,Wang Shaoqiang,et al. Patterns of Soil ~(15)N and Total N and Their Relationships with Environmental Factors on the Qinghai-Tibetan Plateau[J]. PEDOSPHERE,2014,24(2):232. |
| APA | Zhou Lei.,Song Minghua.,Wang Shaoqiang.,Fan Jiangwen.,Liu Jiyuan.,...&Song Ting.(2014).Patterns of Soil ~(15)N and Total N and Their Relationships with Environmental Factors on the Qinghai-Tibetan Plateau.PEDOSPHERE,24(2),232. |
| MLA | Zhou Lei,et al."Patterns of Soil ~(15)N and Total N and Their Relationships with Environmental Factors on the Qinghai-Tibetan Plateau".PEDOSPHERE 24.2(2014):232. |
入库方式： OAI收割
来源：地理科学与资源研究所
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