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作 者 ：彭亿^1,2;李裕元¹;李忠武²;叶芳毅²;潘春翔¹;谢小立¹

期 刊 ：应用生态学报 2009年 20卷 07期 页码：1543-1550

关键词：稻；

摘 要 ：采用冗余分析法对弃耕一年稻田湿地生态系统的植物群落与土壤因子进行了分析.结果表明：在亚热带湿地生态系统中，土壤水分条件、有效钾、有效磷和pH是影响物种分布的最主要土壤因子.试验区的主要植物物种可以划分为3个物种组:丁香蓼-水竹叶物种组(组1)、牛鞭草-圆叶节节菜-稻槎菜物种组(组2)和小白酒草-辣蓼-双穗雀稗物种组(组3).其中，组1主要分布于土壤有效钾含量较高的区域;组2主要分布于阶段性淹水区域;组3主要分布于排水区域，且与土壤有效磷和pH呈正相关.物种多样性与土壤pH、植被地上生物量与土壤全钾含量呈显著正相关，均匀度与土壤有效氮含量呈显著负相关，与其他指标的相关性均不显著.

Abstract:Based on the investigation data from a subtropical wetland having been abandoned from paddy agriculture for one year, a redundancy analysis was conducted on the relationships between vegetation community and soil factors in the wetland. It was found that soil moisture regime, available K and P, and pH were the main factors affecting the distribution of plant species. The common plant species could be classified into three groups, i.e., Ludwigia prostrata〖KG-*2〗-〖KG-*7〗Murdannia triquetra group (G1), Hemarthria altissima〖KG-*2〗-〖KG-*7〗Rotala rotundifolia〖KG-*2〗-〖KG-*7〗Lapsana apogonoides group (G2), and Conyza canadensis〖KG-*2〗-〖KG-*7〗Polygonum hydropiper〖KG-*2〗-〖KG-*7〗Paspalum pasaloides group (G3). G1 mainly distributed on the soils with higher available K, G2 mainly distributed in periodically flooded area, while G3 mainly distributed in drainage area and was positively correlated to soil available P and pH. Species diversity and above-ground biomass had significant positive correlations with soil pH and total K, respectively, while evenness index was significantly negatively correlated with soil available N. No significant correlations were observed among other indices.

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