地球与环境

文章摘要

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

投稿时间：2015-05-25 修订日期：2015-11-12

DOI：10.14050/j.cnki.1672-9250.2016.02.004

中文关键词: 天津;盐渍化土壤;农田;荒地;水溶性氮素

英文关键词: Tianjin;salinized soil;farmland;wasteland;water-soluble nitrogen

基金项目:国家自然科学基金项目(41172315、41302285和41403082);天津市应用基础及前沿技术研究计划项目(14JCYBJC22400);天津市水资源与水环境重点实验室开放基金资助

作者	单位	E-mail
牛颖权^1,2, 李军¹, 杨曦¹, 魏中青³, 张亚亚^1,2, 郭颖^1,2	1. 天津师范大学天津市水资源与水环境重点实验室, 天津 300387 2. 天津师范大学城市与环境科学学院, 天津 300387 3. 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	lijun5931@163.com

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中文摘要:

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。

英文摘要:

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.

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