氮添加对盐渍化草地根际土壤理化性质的影响

doi:10.13287/j.1001-9332.202301.004

应用生态学报 ›› 2023, Vol. 34 ›› Issue (1): 67-74.doi: 10.13287/j.1001-9332.202301.004

氮添加对盐渍化草地根际土壤理化性质的影响

陈鸿飞^1,2,3, 赵芳草^1,2,3, 王一昊^1,2,3, 董宽虎^1,2,3, 王常慧^1,2,3,4, 陈晓鹏^1,2,3*

¹山西农业大学草业学院, 山西晋中 030801;
²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;
³山西右玉黄土高原草地生态系统国家定位观测研究站, 山西右玉 037200;
⁴中国科学院植物研究所植被与环境变化国家重点实验室, 北京 100093

收稿日期:2022-05-06 修回日期:2022-10-31 出版日期:2023-01-15 发布日期:2023-06-15
通讯作者: ^*E-mail: chenxp@sxau.edu.cn
作者简介:陈鸿飞, 男, 1998年生, 硕士研究生。主要从事草地生态与管理研究。E-mail: chenhongfei0126@163.com
基金资助:
国家自然科学基金项目(32271682,31800402)、山西省高等学校科技创新项目(2020L0144)和山西农业大学科技创新基金项目(2018YJ34)资助。

Effects of nitrogen addition on rhizosphere soil properties in a salinized grassland

CHEN Hong-fei^1,2,3, ZHAO Fang-cao^1,2,3, WANG Yi-hao^1,2,3, DONG Kuan-hu^1,2,3, WANG Chang-hui^1,2,3,4, CHEN Xiao-peng^1,2,3*

¹College of Grassland Science, Shanxi Agricultural University, Jinzhong 030801, Shanxi, China;
²Shanxi Key Laboratory of Grassland Ecological Protection and Native Grass Germplasm Innovation, Jinzhong 030801, Shanxi, China;
³Youyu Loess Plateau Grassland Ecosystem National Research Station, Youyu 037200, Shanxi, China;
⁴State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China

Received:2022-05-06 Revised:2022-10-31 Online:2023-01-15 Published:2023-06-15

摘要/Abstract

摘要： 为探究氮输入和根际效应对盐渍化草地土壤理化性质的影响,对8个水平氮添加处理下(0、1、2、4、8、16、24和32 g N·m^-2·a^-1)晋北盐渍化草地根际和非根际土壤理化性质进行研究。结果表明: 氮添加显著降低根际土壤pH,显著增加根际和非根际土壤Ca²⁺、NO₃^--N和无机氮含量;随氮添加量的增加,根际和非根际土壤Ca²⁺、NO₃^--N、无机氮含量以及根际土壤全氮含量呈逐渐升高的趋势,而根际土壤Na⁺、K⁺、Mg²⁺、NH₄⁺-N和氨基酸含量以及非根际土壤全氮含量呈先升高后降低的趋势。主成分分析表明,根际土壤理化性质对低氮(≤8 g·m^-2·a^-1)和高氮添加(>8 g·m^-2·a^-1)的响应具有明显差异。根际土壤pH、有机酸和氨基酸含量分别比非根际土壤低0.71、44.3%和9.8%,而K⁺、Ca²⁺、Mg²⁺、NH₄⁺-N、无机氮、全碳和全氮含量分别比非根际土壤高51.0%、47.6%、20.8%、215.5%、139.3%、31.7%和65.3%,表明根际效应对盐渍化草地土壤理化性质的影响大于氮输入的影响。

关键词: 氮输入, 根际效应, 盐碱土, 土壤养分, 阳离子

Abstract: We explored the impacts of nitrogen (N) inputs and the rhizosphere effect on the properties of rhizosphere and bulk soils in a salinized grassland in Northern Shanxi under N addition rates of 0, 1, 2, 4, 8, 16, 24 and 32 g N·m^-2·a^-1. The results showed that N addition significantly decreased soil pH, but significantly increased Ca²⁺, NO₃^--N and inorganic nitrogen contents in rhizosphere and bulk soil. With the increases of N addition rates, the contents of Ca²⁺, NO₃^--N, inorganic nitrogen in rhizosphere and bulk soils and total nitrogen in rhizosphere soil increased gradually, whereas the contents of Na⁺, K⁺, Mg²⁺, NH₄⁺-N and amino acid in rhizosphere soil, and total nitrogen in bulk soil first increased and then decreased. Results of the principal component analysis showed that the responses of soil properties to low (≤8 g·m^-2·a^-1) and high nitrogen addition rates (>8 g·m^-2·a^-1) were significantly different. Compared with bulk soil, soil pH, the contents of organic acids and amino acids in rhizosphere soil were significantly lower by 0.71 units, 44.3% and 9.8%, respectively, while the contents of K⁺, Ca²⁺, Mg²⁺, NH₄⁺-N, inorganic nitrogen, total carbon and total nitrogen in rhizosphere soil were significantly higher by 51.0%, 47.6%, 20.8%, 215.5%, 139.3%, 31.7% and 65.3%, respectively. These results indicated that rhizosphere effect on soil properties was stronger than that of nitrogen addition.

Key words: nitrogen input, rhizosphere effect, saline-alkaline soil, soil nutrient, cation.

陈鸿飞, 赵芳草, 王一昊, 董宽虎, 王常慧, 陈晓鹏. 氮添加对盐渍化草地根际土壤理化性质的影响[J]. 应用生态学报, 2023, 34(1): 67-74.

CHEN Hong-fei, ZHAO Fang-cao, WANG Yi-hao, DONG Kuan-hu, WANG Chang-hui, CHEN Xiao-peng. Effects of nitrogen addition on rhizosphere soil properties in a salinized grassland[J]. Chinese Journal of Applied Ecology, 2023, 34(1): 67-74.

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氮添加对盐渍化草地根际土壤理化性质的影响

Effects of nitrogen addition on rhizosphere soil properties in a salinized grassland

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