Importance of carbon and nitrogen availability to microbial necromass carbon accumulation in the drawdown area

被引:4
|
作者
Liao, Shanshan [1 ,2 ]
Nie, Xiaodong [3 ,4 ]
Zeng, Aoqi [1 ,2 ]
Liao, Wenfei [1 ,2 ]
Liu, Yi [3 ]
Li, Zhongwu [1 ,2 ,3 ,4 ]
机构
[1] Hunan Univ, Coll Environm Sci & Engn, Minist Educ, Changsha 410082, Peoples R China
[2] Hunan Univ, Key Lab Environm Biol & Pollut Control, Minist Educ, Changsha 410082, Peoples R China
[3] Hunan Normal Univ, Sch Geog Sci, Hunan Prov Key Lab Ecoenvironm Changes & Carbon Se, Changsha 410081, Peoples R China
[4] Hunan Normal Univ, Sch Geog Sci, 36 Lu Shan Rd, Changsha 410081, Hunan, Peoples R China
关键词
Microbial necromass; Soil organic carbon; Drawdown area; Carbon and nitrogen availability; Microbial community; EXTRACTION METHOD; FUMIGATION-EXTRACTION; SEDIMENT RESUSPENSION; MURAMIC ACID; AMINO-SUGARS; SOIL; BIOMASS; VEGETATION; EMISSIONS; WATER;
D O I
10.1016/j.catena.2023.107688
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Lake drawdown areas -where sediment is exposed to the atmosphere due to water level fluctuations -have a nonnegligible impact on the carbon cycle. However, our knowledge of microbial necromass carbon (MNC) in the drawdown area remains to be seen, which has been considered an essential precursor to soil organic carbon (SOC). Here, we examined the content of MNC and its contribution to SOC in three typical habitats (mudflat, grass, and reed area) from the water edge to the uplands in the seasonal drawdown area of Dongting Lake. MNC content in the drawdown area ranged from 1.31 to 3.73 g kg -1, accounting for 27.39 %, 24.51 %, and 27.91 % of SOC in mudflat, grass, and reed areas, respectively. Compared to mudflat areas (1.83 +/- 0.11 g kg -1), vegetated areas (grass: 2.15 +/- 0.18 g kg -1; reed: 2.51 +/- 0.18 g kg -1) showed a higher MNC content. MNC variation was mainly related to carbon and nitrogen availability, plant biomass, clay content, and soil moisture. Our results showed that microbial properties were not essential in regulating MNC accumulation. Instead, external factors such as plant and soil properties played a more critical role in the long-term iterative process of MNC accumulation. Carbon and nitrogen availability, as regulated by plant biomass, clay content, and soil moisture, was dominant in MNC accumulation in drawdown areas. In conclusion, these findings highlight the critical role of external factors in MNC accumulation, which would enhance our understanding of MNC stability in drawdown areas.
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页数:11
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