洞庭湖湿地3种典型植物群落土壤酶活性特征

发布时间：2018-01-27 14:21

本文关键词： 洞庭湖湿地植物群落土壤酶土壤养分　出处：《湖泊科学》2017年04期 　论文类型：期刊论文

【摘要】：调查了洞庭湖湿地典型植物群落(短尖苔草(Carex brevicuspis)、南荻(Triarrhena sacchariflora)、辣蓼(Polygonumhy dropiper))洪水期前后(5、10月)两次表层土壤酶活性及土壤养分性状.结果表明:3种典型群落之间具有明显的土壤养分性状及土壤酶活差异.辣蓼群落具有相对较高的土壤有机质、全氮、全磷、速效磷含量,短尖苔草群落次之,而南荻群落的土壤养分含量最低.3种典型植物群落的土壤有机质、全氮、全磷含量均表现为5月高于10月,土壤速效磷、速效钾洪水期前后无显著差异.辣蓼群落的蔗糖酶活性明显高于其他2个群落;3个群落脲酶活性均表现为10月高于5月,南荻、辣蓼群落有显著差异.磷酸酶以南荻群落最高,短尖苔草群落5月显著高于10月,南荻群落则10月显著高于5月;短尖苔草、南荻群落过氧化氢酶活性显著高于辣蓼群落,短尖苔草群落5月与10月间有显著差异,其余2个群落无显著差异.相关分析表明:脲酶活性与土壤养分含量关系不密切;蔗糖酶活性与土壤有机质、全磷、全氮及速效磷素含量均呈显著正相关.总体上,洞庭湖典型湿地植物群落显示了较为明显的土壤理化状况以及土壤酶活差异;同时也显示了季节性差异.相对而言,辣蓼群落土壤具有较快的物质循环与转化代谢速率,对于氮、磷等污染物具有较高的转化作用,而短尖苔草、南荻群落低于辣蓼群落,这可能与二者较低的土壤有机质以及氮磷养分积累有关.
[Abstract]:The typical plant communities of Dongting Lake wetland (Carex brevicus pisci, Triarrhena sacchariflora) were investigated. Polygonumhy dropiperidae). In October, the soil enzyme activity and soil nutrient properties of the two topsoil layers were studied. The results showed that there were obvious differences in soil nutrient properties and soil enzyme activities among the three typical communities, and the polygonum hydropiper community had relatively high soil organic matter. The content of total nitrogen, total phosphorus, available phosphorus, the community of Carex spp was the second, while the soil nutrient content of the community was the lowest. 3 kinds of typical plant community, soil organic matter, total nitrogen and total phosphorus were higher in May than in October. There was no significant difference in soil available phosphorus and available potassium before and after flood period. The sucrose enzyme activity of Polygonum hydropiper community was significantly higher than that of the other two communities. The urease activities of the three communities were higher in October than in May, and there were significant differences in the south and Polygonum hydropiper communities. The highest urease activity was found in the south of the three communities, and the higher in May than in May in the community of Carex spp. The community of South Amur on October was significantly higher than that on May. The activity of catalase in the community of Carex brevis and Amur mongolica was significantly higher than that of Polygonum hydropiper, and there was a significant difference between May and October. There was no significant difference between the other two communities. The correlation analysis showed that urease activity was not closely related to soil nutrient content. Sucrase activity was positively correlated with soil organic matter, total phosphorus, total nitrogen and available phosphorus. On the whole, the typical wetland plant communities in Dongting Lake showed significant differences in soil physical and chemical status and soil enzyme activity. The soil of Polygonum hydropiper community has faster material circulation and transformation metabolism rate, higher conversion to nitrogen, phosphorus and other pollutants, while Carex spp. Compared with Polygonum hydropiper community, the South Amur community is lower than Polygonum hydropiper community, which may be related to the accumulation of soil organic matter and nitrogen and phosphorus nutrients.
【作者单位】：中国科学院亚热带农业生态研究所亚热带农业生态过程院重点实验室洞庭湖湿地生态系统观测研究站;
【基金】：国家科技支撑计划项目(2014BAC09B03) 国家自然科学基金项目(41601106)联合资助
【分类号】：S154.2
【正文快照】： ***国家科技支撑计划项目(2014BAC09B03)和国家自然科学基金项目(41601106)联合资助.2016-08-31收稿;2016-10-24收修改稿.曾静(1981~),女,硕士,工程师;E-mail:zengjing@isa.ac.cn.ents,while sucraseactitity was positively correlated to soil nutrient contents(including

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