鄱阳湖湿地水位梯度下不同植物群落类型土壤有机碳组分特征

发布时间：2019-05-25 03:36

【摘要】：在鄱阳湖南矶湿地国家级自然保护区沿水位梯度采集了7种优势植物群落下0~15、15~30 cm土壤样品,测定了土壤总有机碳(SOC)、重组有机碳(HFOC)、轻组有机碳(LFOC)、微生物生物量碳(MBC)和可溶性碳(DOC)含量,以阐明鄱阳湖典型湿地土壤有机碳及其不同组分特征与影响因子,探讨植物群落演替对有机碳库及其组分的影响。结果表明:(1)各群落0~30 cm土层SOC、HFOC、LFOC、MBC和DOC含量变化范围分别为4.92~48.14 mg·g~(-1)、4.66~41.42 mg·g~(-1)、0.46~6.52 mg·g~(-1)、124.22~419.23 mg·kg~(-1)和33.17~153.63 mg·kg~(-1)。(2)土层、群落类型及其交互作用均对总有机碳及其组分产生显著影响,水位梯度的影响未达到显著性。(3)湿地0~30 cm土壤HFOC、LFOC、MBC和DOC占总有机碳平均比例分别为92.9%、7.1%、1.44%和0.74%,土壤碳库以稳定的重组有机碳为主,LFOC、MBC、DOC等3种活性有机碳组分在空间分布上没有表现出一致性。(4)鄱阳湖湿地沉水植物群落退缩,湿生、挺水植物群落的扩展短期内将增加土壤碳储量,但碳库的稳定性降低。
[Abstract]:Soil samples from 7 dominant flora falling 0: 15 and 15: 30 cm were collected along the water level gradient in Nangji Wetland National Nature Reserve, Poyang Lake. Soil total organic carbon (SOC), recombinant organic carbon (HFOC), light group organic carbon (LFOC), was determined. The contents of microbial biomass carbon (MBC) and soluble carbon (DOC) were studied in order to elucidate the characteristics and influencing factors of soil organic carbon and its different components in typical wetlands of Poyang Lake, and to explore the effect of plant community succession on organic carbon pool and its components. The results showed that: (1) the contents of SOC,HFOC,LFOC,MBC and DOC in 0 / 30 cm soil layer of each community were 4.92 鈮，

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