Allocation of photosynthestically-fixed carbon in plant and soil during growth of reed (Phragmites australis) in two saline soils
文献类型：SCI/SSCI论文
| 作者 | Li L.; Qiu, S. J.; Chen, Y. P.; Xu, X. L.; Zhao, X. M.; Christie, P.; Xu, M. G. |
| 发表日期 | 2016 |
| 关键词 | Soil salinity Soil organic C pools Photosynthetically-fixed C C-13 pulse labeling Flooded pot experiment dissolved organic-matter yellow-river delta microbial biomass-c in-situ upland grassland clay mineralogy climate-change salt-marsh dynamics wetland |
| 英文摘要 | Aims Terrestrial carbon (C) sequestration is derived mainly from plant photosysthetically-fixed C deposition but soil organic C (SOC) content in saline soils is generally low due to low deposition of C from restricted plant growth. It is important to explore the effects of soil salinity on the allocation of photosynthetically-fixed C to better understand C sequestration in saline wetland soils. Methods We conducted a pot experiment in which reed (Phragmites australis) was grown in a low salinity (LS) soil and a high salinity (HS) soil from the Yellow River Delta under flooded conditions. The allocation of photosynthetically-fixed C into plant tissues, SOC, dissolved organic C (DOC), microbial biomass C (MBC), particulate organic C (POC), and mineral-associated organic C (MAOC) was determined using a C-13 pulselabeling method after four labeling events during the 125-day-long reed growing season and destructive sampling immediately at the end of six hours of pulse labeling (end 6-h) and on the final harvest day (final day). Results In most cases soil salinity, reed growth stage, or reed biomass significantly (P < 0.05) affected the deposition of photosynthetically-fixed C into the plant-soil system. At all four pulses at end 6-h the high salinity soil had significantly (P < 0.05) lower percentage net assimilated C-13 in the roots and significantly higher (P < 0.05) percentage net assimilated C-13 in the soil than did the low salinity soil. At both end 6-h and on the final day the high salinity soil had significantly (P < 0.05) lower (SOC)-C-13, and significantly (P < 0.05) higher (DOC)-C-13/(SOC)-C-13 ratio than the low salinity soil except for pulses 3 and 4 on the final day. The majority of photosynthetically-fixed C in soil was deposited into MAOC pools and > 80 % of deposited (SOC)-C-13 was present as MAOC in the high salinity soil due to its significantly (P < 0.05) higher clay content compared with the low salinity soil. Conclusions Soil salinity affected the allocation of photosynthetically-fixed C in the plant-soil system, and soil texture altered the allocation of rhizodeposition C in different soil particles. |
| 出处 | Plant and Soil |
| 卷 | 404 |
| 期 | 1-2 |
| 页 | 277-291 |
| 语种 | 英语 |
| ISSN号 | 0032-079X |
| DOI标识 | 10.1007/s11104-016-2840-2 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/43028]  |
| 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 | Li L.,Qiu, S. J.,Chen, Y. P.,et al. Allocation of photosynthestically-fixed carbon in plant and soil during growth of reed (Phragmites australis) in two saline soils. 2016. |
入库方式： OAI收割
来源：地理科学与资源研究所
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