摘要
2015年7月采集闽江鳝鱼滩微咸水湿地和道庆洲淡水湿地两种类型湿地沉积物,采用淹水密闭培养方法,研究不同湿地沉积物氮矿化过程及盐度影响.结果表明:相同矿化培养条件下,微咸水湿地矿化持续时间长,矿化能力大,鳝鱼滩沉积物无机氮(NH_4^+-N和NO_3^--N)总量70d后达到矿化稳定浓度(499.8±2.1)mg/kg,道庆洲35d后达到稳定浓度(202.9±4.1)mg/kg,不同盐度条件对矿化过程无机氮浓度基本无影响.两种湿地类型的氮矿化速率随培养时间均呈现先增加后减少,鳝鱼滩沉积物0‰,5‰和10‰盐度条件对应最高矿化速率为(2.54±0.56)mg/(kg·d),(4.96±0.22)mg/(kg·d)和(3.88±0.25)mg/(kg·d),道庆洲同条件矿化速率(1.40±0.01)mg/(kg·d),(2.48±0.15)mg/(kg·d),(1.85±0.11)mg/(kg·d).表明一定范围内的盐度可促进氮矿化速率,但是高盐度产生抑制作用.
To reveal the influence of the salt water intrusion caused by the greenhouse effect on the sediment nitrogenmineralization in the estuary wetland,Cyperus malaccensis marsh sediment samples in the Shanyutan brackish waterwetland and the Daoqingzhou freshwater wetland were collected in July,2015.Using the submerged incubation method,the soil mineralization in different kinds of wetland and salinity effects were examined in the Min River estuary.Theresults suggested that the sediments in brackish water wetland had a longer nitrogen mineralization time as well as astronger mineralization capacity under the same incubation conditions.The total inorganic nitrogen(includes ammonianitrogen and nitrate nitrogen)reached a stable concentration of(499.8±2.1)mg/kg after70d for Shanyutan brackishwetland sediment,while the mineralization reached equilibrium in only30d with a lower stable concentration of(202.9±4.1)mg/kg for Daoqingzhou freshwater wetland sediment.Additionally,salinity condition showed little effect onconcentration of the total inorganic nitrogen during the mineralization process.The rate of nitrogen mineralization forboth brackish and freshwater wetland sediments firstly increased and then decreased as the increase of incubation time.InShanyutan brackish water wetland,the rate of nitrogen mineralization were(2.54±0.56)mg/(kg·d),(4.96±0.22)mg/(kg·d)and(3.88±0.25)mg/(kg·d)under salinity of0‰,5‰and10‰,respectively.While in Daoqingzhou wetland,thecorresponding values were(1.40±0.01)mg/(kg·d),(2.48±0.15)mg/(kg·d)and(1.85±0.11)mg/(kg·d),respectively.Theobservation revealed that moderate salinity conditions can promote the nitrogen mineralization,while high salinityconditions could induced an inhibitory effect.
作者
谢蓉蓉
李家兵
张党玉
黄倩倩
丁晓燕
吴春山
LI Jia-bing;XIE Rong-rong;ZHANG Dang-yu;HUANG Qian-qian;DING Xiao-yan;WU Chun-shan(College of Environmental Science and Engineering, Fujian Normal University, Fuzhou 350007, China;Key Laboratory of Pollution Control and Resource Recycling of Fujian Province, Fujian Normal University, Fuzhou 350007, China;College of Geographical Sciences,Fujian Normal University, Fuzhou 350007, China)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2017年第6期2248-2254,共7页
China Environmental Science
基金
国家自然科学基金项目(51541906)
福建省公益类科研院所专项(2016R1032-1)
福建省科技厅重点项目(2015R0099)
福建省自然科学基金项目(2016J05096)
关键词
矿化作用
盐度
沉积物
短叶茳芏
闽江河口湿地
mineralization
salinity
sediment
Cyperus Malaccensis
Min River Estuary wetland
