Agricultural land use decouples soil nutrient cycles in a subtropical riparian wetland in China
文献类型：SCI/SSCI论文
| 作者 | Wang W. Q.; Wang, C.; Sardans, J.; Min, Q. W.; Zeng, C. S.; Tong, C.; Penuelas, J. |
| 发表日期 | 2015 |
| 关键词 | Nitrogen Phosphorus N:P Land-use change Decoupling of nutrient Stoichiometry elemental stoichiometry n-p ecosystems nitrogen forest carbon eutrophication availability perspectives metabolome |
| 英文摘要 | We examined the impact of human changes in land use on the concentrations and stoichiometric relationships among soil carbon (C), nitrogen (N), phosphorus (P) and potassium (K) in a Phragmites australis riparian wetland (Minjiang River estuary, China). We compared a natural (unaltered) wetland with five altered land uses: intertidal mudflat culture and vegetable, flower, fruit and rice cultivations. All these land uses decreased C, N and K soil concentrations relative to those in the P. australis wetland. The close relationship between total soil C and N concentrations, under all land uses, suggested that N was the most limiting nutrient in these wetlands. The lower N concentrations, despite the use of N fertilizers, indicated the difficulty of avoiding N limitation in the agricultural land. Croplands, except rice cultivation, had lower soil N:P ratios than the original P. australis wetland, consistent with the tendency of favoring species adapted to high rates of growth (low N:P ratio). The release of soil C was less and the soil C:N and C:P ratios higher in the natural P. australis riparian wetland than in the croplands, whereas C storage was more similar. The levels of soil C storage were generally opposite to those of C release, indicating that C release by respiration was the most important factor controlling C storage. Cropland soil management promotes faster nutrient and C cycles and changes in soil nutrient stoichiometry. These impacts can further hinder the regeneration of natural vegetation by nutrient imbalances and increase C-cycling and C emissions. (C) 2015 Elsevier B.V. All rights reserved. |
| 出处 | Catena |
| 卷 | 133 |
| 页 | 171-178 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0341-8162 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/38891]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Wang W. Q.,Wang, C.,Sardans, J.,et al. Agricultural land use decouples soil nutrient cycles in a subtropical riparian wetland in China. 2015. |
入库方式： OAI收割
来源：地理科学与资源研究所
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