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中国农学通报 ›› 2020, Vol. 36 ›› Issue (11): 63-73.doi: 10.11924/j.issn.1000-6850.casb18120133

所属专题: 农业气象

• 资源·环境·生态·土壤·气象 • 上一篇    下一篇

北方森林细根对大气N沉降增加和温度升高的响应

丁丽智, 邢亚娟, 闫国永, 王庆贵()   

  1. 黑龙江大学农业资源与环境学院,哈尔滨 150080
  • 收稿日期:2018-12-31 修回日期:2019-05-28 出版日期:2020-04-15 发布日期:2020-04-28
  • 通讯作者: 王庆贵
  • 作者简介:丁丽智,女,1995年出生,山东泰安人,在读硕士,主要从事细根生物学方面的研究。通信地址:150080 黑龙江省哈尔滨市南岗区学府路74号 黑龙江大学农业资源与环境学院,E-mail: 422526446@qq.com
  • 基金资助:
    国家自然科学基金“阔叶红松林生态系统土壤碳循环对增氮和减水交互作用的响应”(41773075);“大兴安岭北方森林细根动态和形态特征对氮沉降的响应”(41575137);“大兴安岭北方森林生态系统对N沉降增加的响应”(31370494);“小兴安岭阔叶红松林生态系统对N沉降增加的响应”(31170421)

Fine Roots in Northern Forests: Response to Atmospheric N Deposition Increase and Temperature Rise

Ding Lizhi, Xing Yajuan, Yan Guoyong, Wang Qinggui()   

  1. College of Agricultural Resources and Environment, Heilongjiang University, Harbin 150080
  • Received:2018-12-31 Revised:2019-05-28 Online:2020-04-15 Published:2020-04-28
  • Contact: Wang Qinggui

摘要:

为了在全球大气N沉降增加和温度升高的背景下,细根生产和细根生理生态的潜在变化将如何影响森林土壤中的养分供应和陆地C循环。本研究基于34篇国内外已发表的北方森林N沉降、温度升高及其交互作用的170组细根数据,通过meta分析的方法,研究了细根对升温、增N以及二者交互作用的响应。结果表明:(1)增N显著抑制了北方森林细根生物量,明显增加了细根C、N含量,而P则显著减少,细根的呼吸速率显著增加,细根形态变得细长;(2)增温显著增加了土壤C素的有效性,细根的生物量、组织密度、N吸收速率、组织N浓度和呼吸显著增加,但是细根的C和N含量、比根长、直径和呼吸速率却随着温度的增加明显减少;(3)在升温增N的交互作用下,除组织N浓度受到抑制以外,细根生物量、呼吸速率、C、N含量均显著增加。研究表明:升温增N显著影响了北方森林细根的生物量、周转率、养分含量和形态特征,可为改进和完善C收支模型提供参考依据和数据支持。

关键词: 细根, N沉降, 温度升高, 形态结构, 生理功能, meta分析

Abstract:

Under the background of increasing atmospheric N deposition and rising temperature, the potential changes of production and physiology and ecology of fine root will affect nutrient supply and terrestrial C cycle in forest soil. Based on 170 sets of data from 34 published papers on N deposition, temperature rise and their interaction in northern forests, we studied the responses of fine roots to warming, increasing N and their interaction by meta analysis. The results showed that: (1) increasing N significantly inhibited the biomass of fine roots and increased the content of C and N in fine roots, while decreased P significantly, the respiration rate of fine roots increased significantly, and the morphology of fine roots became slender; (2) warming significantly increased the availability of soil C, the biomass, tissue density, N uptake rate, tissue N concentration and respiration of fine roots, but the content of C and N, specific root length, diameter and respiration rate of fine roots decreased with the increase of temperature; (3) under the interaction of rising temperature and increasing N, the biomass, respiration rate and the content of C, N of fine roots increased significantly except the inhibition of tissue N concentration. The results show that the rising temperature and increasing N significantly affect the biomass, turnover, nutrient content and morphological characteristics of fine roots in northern forests, and could provide reference and data support for improving and perfecting the C budget model.

Key words: fine root, N deposition, temperature rise, morphological structure, physiological function, meta analysis

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