首页|三峡水库消落带土壤反硝化及DOM的影响

三峡水库消落带土壤反硝化及DOM的影响

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在重庆主城与涪陵选取了 3个典型点位采集土壤样品,并对土壤的理化性质、原位反硝化速率、溶解性有机质(DOM)驱动的反硝化以及库区土壤的微生物进行了考察与分析.结果显示在海拔145～155m区间,淹水期镇安镇、涪陵区和鱼嘴镇最高氨氮(NH4+-N)平均浓度分别为31.32,28.63和19.23mg/kg,均高于落干期.在淹水期,与高海拔区域土壤中硝酸盐氮(NO3--N)平均浓度相比,低海拔土壤中NO3--N平均浓度分别增大了 46.91％(镇安镇)、37.89％(涪陵区)和29.69％(鱼嘴镇).在淹水期,土壤有机质(SOM)平均浓度随着海拔高程的降低而降低,镇安镇、涪陵区和鱼嘴镇分别从109.16,80.93和82.61mg/kg降至65.63,64.53,53.41mg/kg.土壤中NH4+-N和NO3--N的含量与现场反硝化速率呈显著正相关(P＜0.05),在提供充足的碳©和氮(N)营养元素后,土壤潜在反硝化速率表现出较大的时间和空间差异性.在由DOM驱动的反硝化实验中,DOM降解符合一级动力学模型(R2＞0.93),N2O累积量符合Logistic模型(R2＞0.97).在三峡水库消落带土壤中,反硝化功能微生物主要是Bacillus和Comamonadaceae,其丰度变化与土壤潜在反硝化速率呈现显著的正相关性(P＜0.05).
The characteristics of denitrification in soil and the effect of dissolved organic matter for the typical area of water-level-fluctuating zone of the Three Gorges Reservoir
Soil samples were collected from three typical sites in the main city of Chongqing and Fuling,and the physical and chemical properties of soil,in-situ denitrification rate,DOM-driven denitrification process and soil micro-organisms community in the sampled sites were investigated and analyzed.The results showed that in the flooding period(145～155m),the average concentrations of the highest ammonia nitrogen(NH4+-N)in Zhen'an,Fuling and Yuzui were 31.32,28.63 and 19.23mg/kg,respectively,which were higher than those in the drying period.During the flooding period,compared with the average concentration of nitrate nitrogen(NO3--N)in the soil at high altitude,the average concentration of NO3--N in the soil at low altitude increased by 46.91％(Zhen'an),37.89％(Fuling)and 29.69％(Yuzui),respectively.During the flooding period,the average concentration of soil organic matter(SOM)decreased with the decrease of altitude,from 109.16,80.93 and 82.61mg/kg in Zhen'an,Fuling and Yuzui to 65.63,64.53 and 53.41mg/kg,respectively.The contents of NH4+-N and NO3-N in the soil were significantly positively correlated with the in-situ denitrification rate(P＜0.05).It was found that the potential denitrification rate of soil showed great temporal and spatial differences after given sufficient carbon©and nitrogen(N)nutrients.In the experiment of denitrification by using DOM as carbon source,the degradation of DOM conformed to the first-order kinetic model(R2＞0.93),and the accumulation of N2O conformed to the Logistic model(R2＞0.97).The denitrifying microorganisms in the soil of WLFZ are mainly Bacillus and Comamonadaceae,and their abundance changes have a significant positive correlation with the potential denitrification rate of the soil(P＜0.05).

water-level-fluctuation-zone of the Three Gorges Reservoirdenitrification of soildissolved organic mattermicrobial community

朱砚涛、苏培兴、张代钧、袁淑培、张峻通、刘寅飞

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重庆大学环境与生态学院,重庆 400045

重庆大学,煤矿灾害动力学与控制国家重点实验室,重庆 400044

三峡水库消落带 土壤反硝化 溶解性有机质 微生物群落

重庆市自然科学基金重点项目

cstc2017jcyjBX0042

2024

中国环境科学
中国环境科学学会

中国环境科学

CSTPCDCHSSCD北大核心
影响因子：2.174
ISSN：1000-6923
年,卷(期)：2024.44(6)
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