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作 者 ：王晓龙,徐立刚,姚鑫,白丽,张奇*

期 刊 ：生态学报 2010年 30卷 18期 页码：5033~5042

关键词：鄱阳湖；湿地植物群落；土壤微生物量；植被生物量；

Keywords:Poyang Lake, hygrophilous vegetation community, soil microbial biomass, vegetation biomass,

摘 要 ：系统调查了鄱阳湖典型湿地植物群落土壤微生物量，地表植被生物量及土壤养分性状。结果表明：0—10cm土层微生物量碳以水蓼群落明显最高（925.36 mg kg-1），其次为灰化薹草群落（607.43 mg kg-1）、蒌蒿群落（577.03 mg kg-1）、白茅群落（556.42 mg kg-1）及阿及薹草群落（497.08 m mg kg-1）；香蒲群落与芦苇（荻）群落表层微生物量碳相近，分别为393.40 mg kg-1与376.41 mg kg-1；芦苇群落则显示了最低的表层土壤微生物量碳（174.90 mg kg-1）。与微生物量碳相似，表层土壤微生物量氮以水蓼群落最高，依次为白茅群落﹥灰化薹草群落﹥蒌蒿群落﹥阿及薹草群落﹥香蒲群落﹥芦苇（荻）群落﹥芦苇群落。表层土层微生物量磷在17.730—30.948 mg kg-1之间，各群落间差异较小，以白茅群落最高，芦苇群落最低。微生物量碳与含水量、有机碳、全氮、有效氮极显著正相关，与有效磷显著正相关；微生物量氮与微生物量碳相似，与含水量、有机碳、全氮及有效氮显示极显著正相关性。土壤微生物碳、氮、磷与地表植被生物量之间均显示了互增长关系，其中以微生物量氮关系最为密切（R2=0.377，P=0.027），依次为微生物量磷（R2=0.318，P=0.036）与微生物量碳（R2=0.245，P=0.042），三者与地表植被生物量均达到了显著相关关系（P<0.05）。土壤微生物碳与Shannon-Winner指数之间关系密切，呈显著负相关关系（R2=0277，P=0.039）；土壤微生物量氮与微生物量磷与Shannon-Winner指数之间显示负相关关系，但关系均较弱。

Abstract:Soil microbial biomass, vegetation biomass and soil nutrient in hygrophilous vegetation communities in the wetland of Poyang Lake were systematically investigated in this paper. The results showed that the highest content of soil microbial biomass carbon (SMB C)（925.36 mg kg-1） was found in surface soil (0-10cm) in Polygonum hydropiper community，followed by Carex cinerascens community (607.43 mg kg-1), Artemisia selengensis community（577.03 mg kg-1）, Imperata cylindrical community（556.42 mg kg-1）and Carex argi community（497.08 mg kg-1）. The content of SMB C in surface soil in Typha angustifolia community was close to that of Phragmites communis+Miscanthus sacchariflor community, with the value of 393.40 mg kg-1 and 376.41 mg kg-1 respectively, while the lowest content of SMB C was found in Phragmites communis community. The highest content of soil microbial biomass nitrogen (SBM N) was detected in Polygonum hydropiper community, followed in a decreasing order by Imperata cylindrical community＞Carex cinerascens community＞Artemisia selengensis community＞Carex argi community＞Typha angustifolia community＞Phragmites communis+Miscanthus sacchariflor community and Phragmites communis community. Small difference in contents of soil microbial biomass phosphorus (SMB P) was found among typical hygrophilous vegetation communities, with the value from 17.730 mg kg-1 to 30.948 mg kg-1. The highest content of SMB P was found in Imperata cylindrical community, while the lowest was detected in Phragmites communis community. SMB C and SMB N were significantly and positively correlated with soil moisture, soil organic matter, total nitrogen and available nitrogen, and SMB C also showed significant positive relationship with available phosphorus. SMB C, N and P had significant linear correlation with hygrophilous vegetation biomass (P＜0.05), and the most significant was SMB N (R2=0.377，P=0.027）, followed by SMB P（R2=0.318，P=0.036） and SMB C (R2=0.245，P=0.042), respectively. Significant negative relationship was identified between SMB C and Shannon-Winner Index (R2=0.277, P=0.039). Negative relationship was also found between SMB N, SMB P and Shannon-Winner Index respectively, but not that significant.

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