生态与农村环境学报2017，Vol.33Issue(11)：1007-1012,6.DOI:10.11934/j.issn.1673-4831.2017.11.007
鄱阳湖南矶湿地净生态系统CO2交换量的日变化特征
Diurnal Variation of Net Ecosystem CO2 Exchange of Nanji Wetland Ecosystem in Poyang Lake
摘要
Abstract
With the aid of the eddy covariance technique, monitoring was carried out of net ecosystem CO2 exchange ( NEE) of the Nanji Wetland National Nature Reserve, sitting in the south of Poyang Lake, for analysis of diurnal variation of NEE and its affecting factors, during non-flooding and flooding periods of April, 2015-October, 2016. Results show that during the non-flooding period, diurnal variation of NEE exhibited a typical "U" shaped curve. In the day, CO2 up-take peaked up to 18. 24 μmol·m-2 ·s-1 , while at the night CO2 release did up to 24. 92 μmol·m-2 ·s-1 . During the flooding period, the vegetation in the area was submerged by water, except for the parts in shoals and high lands around the lake. Diurnal variation of NEE in this period didn′t have any distinct characteristics, and was much narrower in ampli-tude than that in the non-flooding period. In daytime, CO2 uptake peaked up to 2. 29μmol·m-2 ·s-1 while at night CO2 release did up to 12. 66μmol·m-2 ·s-1 . Correlation analysis and principal component analysis show that during the non-flooding period, monthly mean daily NEE variation in daytime was the most closely related to photosynthetic photon quanta flux density, and then to air temperature, precipitation, soil moisture content and soil temperature, whereas at night, it was closely related to air temperature, soil temperature and soil moisture content. During the flooding period, monthly mean daily NEE variation in daytime was related to photosynthetic photon quanta flux density and soil moisture content, whereas at night, it was related to soil temperature, soil moisture content and air temperature.关键词
净生态系统CO2交换量/涡度相关/南矶湿地/鄱阳湖Key words
net ecosystem CO2 exchange/eddy covariance/Nanji Wetland/Poyang Lake分类
农业科技引用本文复制引用
王莉莉,杨涛,高晨,高丹,卢成芳,王野乔..鄱阳湖南矶湿地净生态系统CO2交换量的日变化特征[J].生态与农村环境学报,2017,33(11):1007-1012,6.基金项目
国家自然科学基金(41471298) （41471298）
江西省自然科学基金(20133ACB20011) （20133ACB20011）
鄱阳湖湿地与流域研究教育部重点实验室开放基金(PK2016001) （PK2016001）
江西省研究生创新专项(YC2016-S127) （YC2016-S127）
江西省教育厅科学技术研究项目(GJJ150335) （GJJ150335）
