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引用本文:李旭,宋冰冰,李峰,曾静,侯志勇,谢永宏,陈心胜,邓正苗.洞庭湖不同水位高程下南荻(Triarrhena lutarioriparia)种群分布格局及生长动态.湖泊科学,2016,28(5):1039-1046. DOI:10.18307/2016.0514
LI Xu,SONG Bingbing,LI Feng,ZENG Jing,HOU Zhiyong,XIE Yonghong,CHEN Xinsheng,DENG Zhengmiao.Population distribution patterns and growing status of Triarrhena lutarioriparia along a gentle elevation gradient of Lake Dongting wetlands. J. Lake Sci.2016,28(5):1039-1046. DOI:10.18307/2016.0514
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洞庭湖不同水位高程下南荻(Triarrhena lutarioriparia)种群分布格局及生长动态
李旭1, 宋冰冰2, 李峰1, 曾静1, 侯志勇1, 谢永宏1, 陈心胜1, 邓正苗1
1.中国科学院亚热带农业生态研究所, 亚热带农业生态过程重点实验室, 洞庭湖湿地生态系统观测研究站, 长沙 410125;2.湖南省环境监测中心, 长沙 410019
摘要:
通过野外不同水位高程固定样地多次调查,结合方差/均值比率法研究了不同水位高程下洞庭湖湿地南荻(Triarrhena lutarioriparia)种群分布格局及生长动态.结果表明:(1)低程区土壤含水量显著高于高程区;低程区土壤颗粒组成与高程区相比有显著差异,低程区土壤为黏砂壤土,高程区为粉砂土;低程区土壤总有机碳、全氮、铵态氮和pH值等与高程区相比无显著差异,而其硝态氮、有效磷、全钾和速效钾含量低于高程区,全磷含量却恰好相反.(2)调查期间,南荻的分布格局随着植物的生长由均匀分布逐渐变为聚集分布,低程区聚集强度更大;(3)南荻的生物量和高度均随时间增长而迅速增加,且低程区的总生物量和增长量均高于高程区;南荻的密度和基径随时间增长而增加,之后趋于平稳,且低程区均高于高程区.结果分析表明,水位高程差异引起的土壤含水量的显著变化可能是影响南荻分布格局和生长动态最重要的因素.因此,适度地调控水位、增加土壤水分含量可能是控制南荻群落扩张的重要措施.
关键词:  方差/均值比  聚集强度  土壤含水量  洞庭湖  南荻  水位变化
DOI:10.18307/2016.0514
分类号:
基金项目:国家科技基础性工作专项(2013FY111800)、国家自然科学基金项目(31200271)、湖南省科技支撑计划重点项目(2014NK2009)和中国科学院知识创新工程领域前沿项目(ISACX-LYQY-QN-1208)联合资助.
Population distribution patterns and growing status of Triarrhena lutarioriparia along a gentle elevation gradient of Lake Dongting wetlands
LI Xu1, SONG Bingbing2, LI Feng1, ZENG Jing1, HOU Zhiyong1, XIE Yonghong1, CHEN Xinsheng1, DENG Zhengmiao1
1.Institute of Subtropical Agriculture, Key Laboratory of Agro-ecological Processes in Subtropical Region, Dongting Lake Station for Wetland Ecosystem Observation and Research, Chinese Academy of Sciences, Changsha 410125, P. R. China;2.Hunan Environmental Monitoring Center, Changsha 410019, P. R. China
Abstract:
In this study, the population distribution patterns and growing status of Triarrhena lutarioriparia along a gentle elevation gradient were analyzed based on an investigation of the fixed quadrat plot and a method of variance to mean ratio in a typical beach of Lake Dongting wetlands. The results indicated that (1) soil moisture content was significantly higher in the low altitude areas than in the high altitude areas. Soil particle composition of low altitude areas was significantly different from that of high altitude areas. Soil pH was all alkaline. There was also no significant difference in soil total organic carbon, total nitrogen, ammonium nitrogen content and pH, while soil nitrate nitrogen content in low altitude areas was significantly lower than that in the high altitude areas. Soil total phosphorus content was significantly lower in high altitude than that in low altitude, while available phosphorus, total potassium and available potassium showed opposite patterns. (2) The population distribution patterns of T. lutarioriparia in both low and high altitude areas were all changed from a uniform distribution to an aggregated pattern, while the aggregation intensity was greater in the low altitude areas. (3) The biomass of T. lutarioriparia accumulated rapidly along with the time going, which was significantly lower in the low altitude areas than in the high areas. Density and basal diameter of T. lutarioriparia increased significantly along with the time going, which were higher in the low altitude areas than in the high altitude areas. These results indicated that the soil moisture content had a significant influence on the population distribution patterns and the status of T. lutarioriparia growing. Therefore, moderate regulating of water level and increasing soil moisture content may be adaptive to control the invasion of T. lutarioriparia into the Carex community.
Key words:  Variance to mean ratio  aggregation intensity  soil moisture  Lake Dongting  Triarrhena lutarioriparia  water level change
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