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引用本文:张广帅,于秀波,刘宇,张欢,张全军,李雅,段后浪.鄱阳湖碟形湖泊植物分解和水位变化对水体碳、氮浓度的叠加效应.湖泊科学,2018,30(3):668-679. DOI:10.18307/2018.0309
ZHANG Guangshuai,YU Xiubo,LIU Yu,ZHANG Huan,ZHANG Quanjun,LI Ya,DUAN Houlang.Accumulation effect of litter decomposition and water level on carbon and nitrogen in shallow lake water of Lake Poyang. J. Lake Sci.2018,30(3):668-679. DOI:10.18307/2018.0309
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鄱阳湖碟形湖泊植物分解和水位变化对水体碳、氮浓度的叠加效应
张广帅1,2, 于秀波1,2, 刘宇1, 张欢3, 张全军1,2, 李雅1,2, 段后浪1,2
1.中国科学院地理科学与资源研究所中国科学院生态系统网络观测与模拟重点实验室, 北京 100101;2.中国科学院大学, 北京 100049;3.南昌大学生命科学学院, 南昌 330031
摘要:
以鄱阳湖典型碟形湖泊——白沙湖为监测对象,开展水体有机碳(TOC)、总氮(TN)、铵态氮(NH4+-N)和硝态氮(NO3--N)浓度的年内动态变化的定位观测,结合在白沙湖开展的灰化薹草(Carex cinerascens)分解模拟实验和稳定同位素示踪技术,对薹草分解过程和水体营养盐浓度变化进行时间匹配,分析水体中颗粒态有机物(POM)的来源,并探讨水位变化和薹草分解对水体营养盐浓度的交互作用.结果表明,水体TOC、TN和NH4+-N浓度在枯水季14月明显高于其他月份;薹草在0~60 d具有最高的分解速率,鄱阳湖碟形湖泊洲滩湿地薹草分解起始时间为当年12月前后;水体POM与薹草活体和分解残体的δ13C差异不显著,而与苦草和藻类具有显著性差异,说明薹草分解残体是水体中POM的主要来源;薹草分解过程明显影响湖泊水体TN、NH4+-N和TOC浓度变化;水位变化对湖泊水体NO3--N浓度变化效应最明显.
关键词:  分解  水位  水体营养盐  交互效应  稳定同位素  鄱阳湖  白沙湖  灰化薹草
DOI:10.18307/2018.0309
分类号:
基金项目:国家自然科学基金项目(41471088)和地方合作项目(鄱阳湖水生态综合模型研究及开发)联合资助.
Accumulation effect of litter decomposition and water level on carbon and nitrogen in shallow lake water of Lake Poyang
ZHANG Guangshuai1,2, YU Xiubo1,2, LIU Yu1, ZHANG Huan3, ZHANG Quanjun1,2, LI Ya1,2, DUAN Houlang1,2
1.Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, P. R. China;2.University of Chinese Academy of Sciences, Beijing 100049, P. R. China;3.College of Life Science, Nanchang University, Nanchang 330031, P. R. China
Abstract:
Water level, an important hydrological factor in shallow lakes, has great influence on chemical processes. Wetland plants have become an important means of ecological restoration, but the problem of producing pollution after the plant decaying has been paid extensive attention. Base on the observation of water nutrients concentration of Lake Baisha, the monthly changes of total organic carbon (TOC), total nitrogen (TN), ammonium nitrogen (NH4+-N) and nitrate nitrogen (NO3--N) concentrations were analyzed. Stable isotope analysis was applied to track the major source for particulate organic matter (POM) in the water. Combined with the decomposition simulation experiment performed in Lake Baisha, we revealed the specific time of the decomposition stage of Carex cinerascens in natural state, and studied the interaction effect of water level and decomposition process on water nutrients. Results showed that TOC, TN, NH4+-N and NO3--N concentrations in lake water from Jan. to Apr. during the dry season were significantly higher than those during other periods. Carex cinerascens had the highest decay rate during the early 60 days. Under natural state, decomposition of Carex cinerascens begin at December according to the exponential decay model. δ13C value of water POM was similar to Carex cinerascens, while had significant differences with Vallisneria natans and alga. Litter decomposition had a certain effect on TN, NH4+-N and TOC concentrations in water. Water level had obvious effect on NO3--N concentration in water. While water level and litter decomposition had accumulation effects on TN and NH4+-N concentrations.
Key words:  Decomposition  water level  water nutrients  interaction  stable isotope  Lake Poyang  Lake Baisha  Carex cinerascens
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