[1]JI Changpin,ZHANG Xiaoping.Photosynthetic Carbon Storage and Distribution in Different Wetland Communities in Poyang Lake[J].Research of Soil and Water Conservation,2022,29(03):121-127.
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Photosynthetic Carbon Storage and Distribution in Different Wetland Communities in Poyang Lake
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
29
Number of periods:
2022 03
Page number:
121-127
Column:
Public date:
2022-04-20
- Title:
- Photosynthetic Carbon Storage and Distribution in Different Wetland Communities in Poyang Lake
- CLC:
- S718.5
- DOI:
- -
- Abstract:
- The natural abundance of stable carbon isotopes(13C)characterizes key processes in the ecosystem carbon cycle and is used to track the dynamics and distribution of carbon in terrestrial ecosystems. The 13C pulse marker of different plants and photosynthetic carbon distribution to underground input characteristics had been studied for four consecutive years(2015—2018)to explore different Poyang Lake wetland plant community(plant artemisia community, water smartweed community, carex community, reed community)photosynthetic carbon reserves and distribution and its related influencing factors. The results showed that:(1)both soil organic carbon content and organic carbon storage showed consistent change patterns, among which the topsoil was the highest; with the increase of soil depth, the soil organic carbon content below 20—40 cm had a relatively small change range, the soil organic carbon content of 60—80 cm was the lowest; the content of 13C in soil gradually increased with the increase of soil depth, among which the different soil layers showed roughly plant artemisia community > water smartweed community>carex community>reed community;(2)the soil nutrient content and aboveground and underground biomass of different wetland plant communities showed consistent variation trends, which were all manifested as plant artemisia community < water smartweed community < carex community < reed community, and the differences among different plant communities were significant(p<0.05); the total phosphorus content showed an opposite trend, and the difference among different plant communities was significant(p>0.05);(3)on the day of pulse labeling, all the 13C values of different plants showed the order: leaves>stems>roots>soil, and plant artemisia community > water smartweed community>carex community>reed community, indicating that the roots of different plants had greater enrichment of photosynthetic fixation new carbon; on the day of marking, the fixed percentage of 13C on the ground of different plants was higher, indicating higher efficiency of marking and greater distribution difference; after pulse marking for 21 days, the 13C value decreased and the amount of fixed photosynthetic carbon transferred to the soil increased significantly;(4)after labeling, the proportion of fixed 13C in each component of plant-soil system in total net photosynthetic 13C showed a trend of: leaves>roots> soil, and photosynthetic carbon increased in different parts of plants and soil, mainly in the aboveground part;(5)the correlation analysis results showed that the aboveground biomass was significantly positively correlated with the 13C content of stems and leaves(p<0.05), and the underground biomass was significantly positively correlated with the 13C content of roots and soil(p<0.05), suggesting that the aboveground and underground biomass plays a leading role in the distribution of photosynthetic carbon.
- References:
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Last Update:
2022-04-20