Back to Search
Start Over
Allocation of photosynthestically-fixed carbon in plant and soil during growth of reed ( Phragmites australis) in two saline soils.
- Source :
-
Plant & Soil . Jul2016, Vol. 404 Issue 1/2, p277-291. 15p. - Publication Year :
- 2016
-
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 C 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 C in the roots and significantly higher ( P < 0.05) percentage net assimilated C 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, and significantly ( P < 0.05) higher DOC/SOC 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 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0032079X
- Volume :
- 404
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- Plant & Soil
- Publication Type :
- Academic Journal
- Accession number :
- 116146932
- Full Text :
- https://doi.org/10.1007/s11104-016-2840-2