氮添加下城市森林土壤呼吸动态变化及其影响因素

doi:10.13287/j.1001-9332.202003.037

应用生态学报 ›› 2020, Vol. 31 ›› Issue (3): 744-752.doi: 10.13287/j.1001-9332.202003.037

氮添加下城市森林土壤呼吸动态变化及其影响因素

付若仙, 余景松¹, 张云彬¹, 俞元春², 陶晓^1*

¹安徽农业大学林学与园林学院, 合肥 230036;
²南京林业大学生物与环境学院, 南京 210037

收稿日期:2019-09-18 出版日期:2020-03-15 发布日期:2020-03-15
通讯作者: E-mail: hyytaoxiao@163.com
作者简介:付若仙, 女, 1996年生, 硕士研究生. 主要从事城市生态、风景园林景观设计研究. E-mail: 594113168@qq.com
基金资助:
本文由国家自然科学基金项目(31700631,31670615)和安徽省自然科学基金项目(1808085MC90)资助

Dynamics of soil respiration and its influencing factors in urban forests under nitrogen addition

FU Ruo-xian¹, YU Jing-song¹, ZHANG Yun-bin¹, YU Yuan-chun², TAO Xiao^1*

¹College of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei 230036, China;
²College of Biology and Environment, Nanjing Forestry University, Nanjing 210037, China

Received:2019-09-18 Online:2020-03-15 Published:2020-03-15
Contact: E-mail: hyytaoxiao@163.com
Supported by:
This work was supported by the National Natural Science Foundation of China (31700631, 31670615) and the Natural Science Foundation of Anhui Province (1808085MC90)

摘要/Abstract

摘要： 城市森林是生态系统重要碳库,其土壤呼吸是构成陆地土壤碳循环的重要环节。为了研究全球氮沉降增加背景下城市森林土壤呼吸动态变化及影响因素,本研究选取安徽省合肥市蜀山森林公园典型城市森林为研究对象,通过添加0(CK)、50(LN)、100(HN) kg N·m^-2·a^-1硝酸铵试验,对其土壤呼吸速率、温湿度及理化性质进行动态观测。结果表明: 城市森林土壤呼吸具有明显的季节差异,氮添加没有改变土壤呼吸季节动态特征;土壤呼吸与土壤温度存在显著相关性,土壤温度与土壤湿度的交互作用能更好地解释土壤呼吸的变异;氮添加在一定程度上改变了土壤呼吸的温度敏感性,其指数Q₁₀值表现为LN(2.12)>CK(2.10)>HN(2.05);不同氮添加条件下,土壤呼吸与土壤硝态氮、溶解性有机碳、pH、碳氮比存在显著相关关系;氮添加对土壤呼吸的促进作用主要表现在生长季,对非生长季土壤呼吸则表现出轻微的抑制作用。

Abstract: Urban forest is an important carbon pool, soil respiration of which is an important part of terrestrial carbon cycle. To understand the dynamics and influencing factors of soil respiration in urban forest under the background of increasing nitrogen deposition, we conducted dynamic observation on soil respiration rate, temperature, moisture and chemical properties by adding 0 (CK), 50 (LN), 100 (HN) kg N·m^-2·a^-1 ammonium nitrate to a typical urban forest. The results showed that soil respiration had significant seasonal variation, which was not affected by nitrogen addition. Soil respiration was significantly correlated with soil temperature. The interaction between soil temperature and soil moisture could better explain the variation of soil respiration. Nitrogen addition changed temperature sensitivity of soil respiration, with the order of Q₁₀ values as LN (2.12) > CK (2.10) > HN (2.05). Soil nitrate concentration, soil soluble organic carbon, pH, soil carbon to nitrogen ratio had significant correlation with soil respiration. The positive effect of nitrogen deposition on soil respiration was mainly in the growing season, with slightly inhibitive effect in the non-growing season.

付若仙, 余景松, 张云彬, 俞元春, 陶晓. 氮添加下城市森林土壤呼吸动态变化及其影响因素[J]. 应用生态学报, 2020, 31(3): 744-752.

FU Ruo-xian, YU Jing-song, ZHANG Yun-bin, YU Yuan-chun, TAO Xiao. Dynamics of soil respiration and its influencing factors in urban forests under nitrogen addition[J]. Chinese Journal of Applied Ecology, 2020, 31(3): 744-752.

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氮添加下城市森林土壤呼吸动态变化及其影响因素

Dynamics of soil respiration and its influencing factors in urban forests under nitrogen addition

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