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Plant and Soil

, Volume 404, Issue 1–2, pp 277–291 | Cite as

Allocation of photosynthestically-fixed carbon in plant and soil during growth of reed (Phragmites australis) in two saline soils

  • Ling Li
  • Shaojun QiuEmail author
  • Yinping Chen
  • Xingliang Xu
  • Ximei Zhao
  • Peter Christie
  • Minggang XuEmail author
Regular Article

Abstract

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 13C pulse-labeling 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 13C in the roots and significantly higher (P < 0.05) percentage net assimilated 13C 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 SO13C, and significantly (P < 0.05) higher DO13C/SO13C 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 SO13C 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.

Keywords

Soil salinity Soil organic C pools Photosynthetically-fixed C 13C pulse labeling Flooded pot experiment 

Notes

Acknowledgments

This work was funded by the National Natural Science Foundation of China (41101220), the Outstanding Young Scientist Research Award Fund of Shandong Province, China (BS2011HZ001), the “973” program (2013CB127405), and National Nonprofit Institute Research Grant of CAAS (IARRP-2015-27).

Supplementary material

11104_2016_2840_MOESM1_ESM.doc (599 kb)
ESM 1 (DOC 599 kb)

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  1. 1.National Engineering Laboratory for Improving Quality of Arable Land, Ministry of Agriculture Key Laboratory of Plant Nutrition and Fertilizers, Institute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijingChina
  2. 2.Shandong Key laboratory of Eco-Enviromental Science for Yellow River DeltaBinzhou UniversityBinzhou CityChina
  3. 3.Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina
  4. 4.Agri-Food and Biosciences InstituteBelfastUK

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