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引用本文:李亚芳,陈心胜,项文化,谢永宏.火烧对洞庭湖湿地荻(Miscanthus sacchariflorus)和苔草(Carex brevicuspis)群落土壤性质的影响.湖泊科学,2016,28(2):334-339. DOI:10.18307/2016.0213
LI Yafang,CHEN Xinsheng,XIANG Wenhua,XIE Yonghong.The effects of burning disturbance on the soil chemical properties of Miscanthus sacchariflorus(Poaceae) and Carex brevicuspis(Cyperaceae) communities at Lake Dongting wetlands. J. Lake Sci.2016,28(2):334-339. DOI:10.18307/2016.0213
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火烧对洞庭湖湿地荻(Miscanthus sacchariflorus)和苔草(Carex brevicuspis)群落土壤性质的影响
李亚芳1,2, 陈心胜1, 项文化2, 谢永宏1
1.中国科学院亚热带农业生态研究所, 洞庭湖湿地生态系统观测研究站, 长沙 410125;2.中南林业科技大学生命科学与技术学院, 长沙 410004
摘要:
火烧作为调控因子,对植物群落结构和生态系统功能具有重要影响,但在湖泊湿地中研究较少. 通过野外调查取样与实验室分析,探讨火烧对洞庭湖湿地主要群落类型--荻(Miscanthus sacchariflorus)和苔草(Carex brevicuspis)土壤化学性质的影响. 结果表明:火烧后,苔草群落土壤硝态氮含量显著减少64.6%,有机质含量增加26.3%;而荻群落土壤与之相反,硝态氮含量增加186.9%,有机质含量减少22.9%. 火烧后,苔草群落的全氮、铵态氮、全碳和全磷含量均显著增加,分别增加了75.4%、36.3%、102.7%和76.9%,而荻群落土壤与对照组间无显著差异. 总体上,火烧对荻群落土壤养分影响不大,可作为芦苇场的一种管理方式,但火烧促进苔草群落土壤养分释放,有助于苔草群落提前萌芽和生长,并引起牲畜牧食增加.
关键词:  火烧  湿地植物  土壤营养  干扰    苔草  洞庭湖
DOI:10.18307/2016.0213
分类号:
基金项目:国家水体污染控制与治理科技重大专项(2012ZX07204-003-002)和国家科技支撑计划项目(2014BAC09B00)联合资助.
The effects of burning disturbance on the soil chemical properties of Miscanthus sacchariflorus(Poaceae) and Carex brevicuspis(Cyperaceae) communities at Lake Dongting wetlands
LI Yafang1,2, CHEN Xinsheng1, XIANG Wenhua2, XIE Yonghong1
1.Dongting Lake Station for Wetland Ecosystem Research, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, P. R. China;2.College of Life Science and Technology, Central South Forestry University, Changsha 410004, P. R. China
Abstract:
Fire, as an important regulator of the ecosystem, has significant impacts on plant community structure and ecosystem function, but few studies have been conducted in wetland ecosystems. In this paper, we investigated the impacts of fire on soil properties of the dominant community types-Miscanthus sacchariflorus and Carex brevicuspis at Lake Dongting wetlands through field survey and laboratory analyses. The results indicated that soil nitrate nitrogen content of Carex brevicuspis significantly reduced by 64.6% and organic matter content significantly increased by 26.3% after the burning, which were in contrast with that in Miscanthus sacchariflorus communities, whose soil nitrate nitrogen contents ignificantly increased by 186.9% and organic matter content significantly reduced by 22.9% after the burning. After the burning, total nitrogen, ammonia nitrogen, total phosphorus and total carbon content of Carex brevicuspis community significantly increased by 75.4%, 36.6%, 102.7%, 76.9%, respectively, but no significant changes in Miscanthus sacchariflorus community. Generally, unreasonable fire is the most common reason for soil properties changes, the burning has little impacts on soil nutrients of Miscanthus sacchariflorus community at the Lake Dongting wetland, which suggested that fire could be a management tool for reed fields (mainly Miscanthus sacchariflorus communities). Burning can release soil nutrients and stimulate sprouting and growth of Carex brevicuspis community, which may aggregate livestock grazing. This study provides a theoretical guidance for management of lacustrine wetland ecosystems. So, the research of this process and mechanism of unreasonable fire is of great significance to the protection of wetlands and the management of ecosystem.
Key words:  Fire  wetland plants  soil nutrients  disturbances  Miscanthus sacchariflorus  Carex brevicuspis  Lake Dongting
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