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天津盐渍化土壤水溶性氮素组成及分布特征

Composition and Distribution of Water-Soluble Nitrogen in Salinized Soils in Tianjin City, China

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对天津不同程度盐渍化农田(n=4)和荒地(n=4)土壤水溶性有机碳(SOC)和水溶性氮素组成与分布特征进行了研究.结果表明:农田和荒地土壤水溶性有机碳(SOC)含量分别为26.1～46.4 mg/kg和19.6～77.8 mg/kg,由表层向下呈现出降低-升高-稳定的变化趋势.农田土壤具有较高溶解性总氮(TSN)、硝氮(NO3--N)和水溶性有机氮(SON)含量,分别是荒地土壤的0.8～5.9、0.8～10.5和0.9～8.7倍.NO3-N和SON是TSN的主要组成部分,分别占农田土壤TSN的38％～72％和26％ ～ 60％,荒地土壤的32％～75％和16％ ～58％.NO3--N、SON在农田土壤剖面中主要积累在土壤表层和底层,而在荒地土壤剖面中主要积累在土壤表层,且在农田土壤中具有较高的淋溶风险.
An investigation on composition and distribution of water-soluble carbon and nitrogen in farmlands (n =4) and wastelands (n =4) of different salinized soils in Tianjin City,China was carried out.Results show that the soluble organic carbon (SOC) ranges from 26.1-46.4 mg/kg and 19.6-77.8 mg/kg in farmlands and wastelands,respectively.SOC has a trend of drop-rise-stable from topsoil to subsoil.The total soluble nitrogen(TSN),NO3--N and soluble organic nitrogen(SON) in farmlands appear higher than in wastelands,and the average contents in farmlands are 0.84-5.9,10.8-10.5,and 0.9-8.7 times as in wastelands,respectively.The NO3--N and SON are the main form of TSN,accounting for 38％-72％ and 26％-60％ of the TSN in the farmlands,and 32％-75％ and 16％-58％ of the TSN in the wastelands,respectively.The NO3--N and SON are mainly accumulated in topsoil and subsoil in farmland profiles,but mainly in topsoil in wasteland profiles,and have a higher risk of leaching losses in farmlands.

Tianjinsalinized soilfarmlandwastelandwater-soluble nitrogen

牛颖权、李军、杨曦、魏中青、张亚亚、郭颖

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天津师范大学天津市水资源与水环境重点实验室,天津300387

天津师范大学城市与环境科学学院,天津300387

中国科学院沈阳应用生态研究所污染生态与环境工程重点实验室,沈阳110016

天津 盐渍化土壤 农田 荒地 水溶性氮素

国家自然科学基金国家自然科学基金天津市应用基础及前沿技术研究计划项目天津市水资源与水环境重点实验室开放基金

4117231541302285和4140308214JCYBJC22400

2016

10.14050/j.cnki.1672-9250.2016.02.004

地球与环境
中国科学院地球化学研究所

地球与环境

CSTPCDCSCD
影响因子：0.875
ISSN：1672-9250
年,卷(期)：2016.44(2)
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