Root-derived respiration and non-structural carbon of rice seedlings
文献类型：SCI/SSCI论文
| 作者 | Xu X. L. ; Kuzyakov Y. ; Wanek W. ; Richter A. |
| 发表日期 | 2008 |
| 关键词 | C-14 CO2 partitioning methods sugars non-structural carbon organic acids rhizomicrobial respiration root-derived respiration SOM-derived respiration soil respiration co2 efflux rhizosphere respiration photosynthesis controls carbohydrate status electron-transport forest plants rhizodeposition requirements |
| 英文摘要 | Various methods have been suggested to separate root and microbial contributions to soil respiration. However, to date there is no ideal approach available to partition below-ground CO2 fluxes in its components although the combination of traditional methods with approaches based on isotopes seems especially promising for the future improvement of estimates. Here we provide evidence for the applicability of a new approach based on the hypothesis that root-derived (rhizomicrobial) respiration, including root respiration and CO2 derived from microbial activity in the immediate vicinity of the root, is proportional to non-structural carbon contents (sugars and organic acids) of plant tissues. We examined relationships between root-derived CO2 and non-structural carbon of rice (Oryza sativa) seedlings using C-14 pulse labelling techniques, which partitioned the C-14 fixed by photosynthesis into root-derived (CO2)-C-14, and C-14 in sugars and organic acids of roots and shoots. After the C-14 pulse C-14 in both sugars and organic acids of plant tissues decreased steeply during the first 12 h, and then decreased at a lower rate during the remaining 60 h. Soil (CO2)-C-14 efflux and Soil CO2 efflux strongly depended on C-14 pools in non-structural carbon of the plant tissues. Based on the linear regression between root-derived respiration and total non-structural carbon (sugars and organic acids) of roots, non-rhizomicrobial respiration (SOM-derived) was estimated to be 0.25 mg C g(-1) root d.w. h(-1). Assuming the value was constant, root-derived respiration contributed 85-92% to bulk soil respiration. (C) 2007 Elsevier Masson SAS. All rights reserved. |
| 出处 | European Journal of Soil Biology |
| 卷 | 44 |
| 期 | 1 |
| 页 | 22-29 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1164-5563 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/22657]  |
| 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 | Xu X. L.,Kuzyakov Y.,Wanek W.,et al. Root-derived respiration and non-structural carbon of rice seedlings. 2008. |
入库方式： OAI收割
来源：地理科学与资源研究所
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