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应用生态学报 ›› 2024, Vol. 35 ›› Issue (1): 212-218.doi: 10.13287/j.1001-9332.202401.007

• 研究论文 • 上一篇    下一篇

不同水平氮添加下华北盐渍化草地根际土壤阴阳离子特征

常婕1,2, 居新1,2, 伊李凯1,2, 宁亚楠1,2, 刁华杰1,2, 郝杰1,2, 王常慧1,2*, 董宽虎1,2   

  1. 1山西农业大学草业学院/草地生态保护与乡土草种质创新山西省重点实验室, 山西晋中 030801;
    2山西右玉黄土高原草地生态系统国家定位观测研究站, 山西朔州 037200
  • 收稿日期:2023-08-21 接受日期:2023-11-25 出版日期:2024-01-18 发布日期:2024-03-21
  • 通讯作者: * E-mail: wangch@ibcas.ac.cn
  • 作者简介:常 婕, 女, 1999年生, 硕士研究生。主要从事草地生态学研究。E-mail: changjie81629@163.com
  • 基金资助:
    国家自然科学基金区域创新联合基金项目 (U22A20576)、国家重点研发计划项目子课题 (2022YFF1302801)、山西省重点实验室项目(202104010910017)和山西农业大学高层次引进人才专项 (2021XG008)

Characteristics of anion and cation in rhizosphere soil of saline grassland in North China under different nitrogen addition levels

CHANG Jie1,2, JU Xin1,2, YI Likai1,2, NING Yanan1,2, DIAO Huajie1,2, HAO Jie1,2, WANG Changhui1,2*, DONG Kuanhu1,2   

  1. 1College of Grassland Science, Shanxi Agricultural University/Shanxi Key Laboratory of Grassland Ecological Protection and Native Grass Germplasm Innovation, Jinzhong 030801, Shanxi, China;
    2Shanxi Youyu Loess Plateau Grassland Ecosystem National Observation and Research Station, Shuozhou 037200, Shanxi, China
  • Received:2023-08-21 Accepted:2023-11-25 Online:2024-01-18 Published:2024-03-21

摘要: 以华北农牧交错带重度盐渍化赖草草地为对象,研究不同水平氮处理(0、1、2、4、8、16、24、32 g N·m-2·a-1)下根际土壤、非根际土壤以及根际与非根际混合土壤的阴阳离子含量,分析外源氮输入影响盐渍化草地土壤理化特征的过程及机理。结果表明: 随着氮添加量的增加,根际、混合和非根际土壤的pH值均显著降低,与对照相比,32 g N·m-2·a-1处理下3种土壤pH值分别下降1.2、0.9和0.6,根际土壤的pH值比非根际土壤降低0.44。根际、混合和非根际土壤的Na+含量显著降低,NO3-含量显著升高。与对照相比,32 g N·m-2·a-1处理下根际土壤Na+含量占可溶性总盐含量的比例减少14%,非根际土壤减少12%,而根际土壤的NO3-含量占可溶性总盐含量的比例增加了29%,非根际土壤增加26%。pH值与土壤NO3-含量呈显著负相关,与Na+含量呈显著正相关。32 g N·m-2·a-1处理下根际土壤的可溶性总盐含量比对照显著减少31.5%,氮沉降可以降低土壤pH值和根际土壤可溶性总盐含量,减轻盐碱胁迫。

关键词: 氮沉降, 根际土壤, 碱性土, 赖草, 盐基离子

Abstract: We investigated the effects and mechanisms of nitrogen additions (0, 1, 2, 4, 8, 16, 24, 32 g N·m-2·a-1) on contents of anion and cation in rhizosphere soil, bulk soil, and mixed rhizosphere and bulk soil in the heavily salinized grassland in the agro-pastoral ecotone of North China. The results showed that pH of rhizosphere, mixed and bulk soils decreased significantly with the increases of nitrogen addition levels. Moreover, pH of three soil types under the 32 g N·m-2·a-1 treatment decreased by 1.2, 0.9, and 0.6, respectively, while pH of rhizosphere soil decreased by 0.44 compared with the bulk soil. Na+ content of rhizosphere, mixed and bulk soils significantly decreased, while the NO3- content significantly increased. The proportion of Na+ content in total soluble salt content in rhizosphere soil decreased by 14% and that in bulk soil decreased by 12% after the 32 g N·m-2·a-1 addition. NO3- content increased by 29% in rhizosphere soil and by 26% in bulk soil. There was significant negative correlation between pH and NO3- content, and significant positive correlation between pH and Na+ content. The total soluble salt content of rhizosphere soil under the 32 g N·m-2·a-1 treatment was significantly reduced by 31.5%. Collectedly, nitrogen deposition could reduce soil pH and total soluble salt content of rhizosphere soil and alleviate saline-alkali stress.

Key words: nitrogen deposition, rhizosphere soil, alkaline soil, Leymus secalinus, base cation