闽江河口湿地沉积物氮矿化对盐度响应研究

发布时间：2018-04-08 23:04

本文选题：矿化作用　切入点：盐度　出处：《中国环境科学》2017年06期

【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.
[Abstract]:July 2015 Minjiang Shanyutan wetland acquisition of brackish water and road kyongju freshwater wetland two types of wetland sediments, using submerged incubation method, study the different wetland sediment nitrogen mineralization process and salinity. The results showed that the mineralization conditions, brackish water wet and of long duration, the ability of mineralization, the Shanyutan inorganic nitrogen from sediments (NH_4~+-N and NO_3~--N) after total 70D mineralization was achieved stable concentration (499.8 + 2.1) mg/kg, Qingzhou road after 35d reached a steady concentration (202.9 + 4.1) mg/kg, different salinity conditions on the mineralization process of inorganic nitrogen concentration has no effect. The nitrogen mineralization rate of two wetland types with incubation time increased firstly and then reduce the Shanyutan sediment 0 per thousand, 5 per thousand and 10 per thousand salinity conditions corresponding to the highest mineralization rate is (2.54 + 0.56) mg/ (kg, d), (4.96 + 0.22) mg/ (kg, d) and (3.88 + 0.25) mg/ (kg - D), Qingzhou road with the condition of mineralization The rate is (1.40 + 0.01) mg/ (kg. D), (2.48 + 0.15) mg/ (kg. D), (1.85 + 0.11) mg/ (kg. D), indicating that salinity in a certain range can accelerate the rate of nitrogen mineralization, but high salinity inhibits it.

【作者单位】：福建师范大学环境科学与工程学院;福建师范大学福建省污染控制与资源循环利用重点实验室;福建师范大学地理科学学院;
【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)
【分类号】：P512.2;P593

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