氮添加对沙质草地微生物呼吸与根系呼吸的影响

doi:10.13287/j.1001-9332.201607.012

应用生态学报 ›› 2016, Vol. 27 ›› Issue (7): 2189-2196.doi: 10.13287/j.1001-9332.201607.012

氮添加对沙质草地微生物呼吸与根系呼吸的影响

林力涛^1,2, 孙学凯^1*, 于占源¹, 王克林^1,2, 曾德慧¹

¹中国科学院沈阳应用生态研究所大青沟沙地生态实验站, 沈阳 110016;
²中国科学院大学, 北京 100049

收稿日期:2015-11-17 发布日期:2016-07-18
通讯作者: *E-mail: sunxuekai@iae.ac.cn
作者简介:林力涛,男,1989年生,博士研究生. 主要从事草地生态系统碳循环研究. E-mail: www123lin1989@163.com
基金资助:
本文由中国科学院战略性先导科技专项(XDA05050401, XDA050570100)和国家自然科学基金项目(41401262, 31300345)资助

Effects of nitrogen addition on microbial respiration and root respiration in a sandy grassland.

LIN Li-tao^1,2, SUN Xue-kai^1*, YU Zhan-yuan¹, WANG Ke-lin^1,2, ZENG De-hui¹

¹Daqinggou Ecological Station, Institute of Applied Ecology, Chinese Academy of Sciences, Shen-yang 110016, China;
²University of Chinese Academy of Sciences, Beijing 100049, China

Received:2015-11-17 Published:2016-07-18
Contact: *E-mail: sunxuekai@iae.ac.cn
Supported by:
This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA05050401, XDA050570100), the National Natural Science Foundation of China (41401262, 31300345).

摘要/Abstract

摘要： 土壤呼吸可以细化为根系呼吸和微生物呼吸,二者对氮添加的响应有所不同.本文以科尔沁沙质草地为研究对象,探讨氮添加对土壤CO₂排放的影响,并细化为微生物呼吸和根系呼吸的响应特征.结果表明: 在观测期(5—10月),土壤呼吸、微生物呼吸月动态均呈先升高后降低的趋势;微生物呼吸是土壤呼吸的主要贡献者,占82.6%;观测期内根系呼吸贡献率随月份而变化,根系呼吸贡献率两个峰值分别出现在5月(占49.4%)和8月(占41.9%),6个月的平均贡献率为17.4%;在10 ℃条件下,根系呼吸较微生物呼吸对氮添加的响应更为敏感,微生物呼吸速率在氮添加后降低了3.9%,而根系呼吸降低了17.7%;氮添加提高了土壤呼吸、微生物呼吸温度敏感性Q₁₀值,也提高了二者对土壤水分变化的敏感程度.

Abstract: Soil respiration includes root respiration and microbial respiration. Effects of nitrogen addition on root respiration and microbial respiration may be quite different. We examined the effects of N-addition on the releasing of soil CO₂ and the responses of root respiration and microbial respiration in a Keerqin sandy grassland, Northeast China. Results showed that both soil respiration and microbial respiration firstly rose then declined during the growing season (May to October). Microbial respiration was the main contributor of soil respiration, accounting for 82.6%. Contribution rate of root respiration altered with months, peaking in May (49.4%) and August (41.9%), with an average contribution rate of 17.4% during the growing season. Root respiration (with a decrease of 17.7%) was more sensitive to N-addition compared with microbial respiration (with a decrease of 3.9%) at 10 ℃. N-addition increased Q₁₀ values of soil respiration and microbial respiration, and enhanced their sensitivity to soil water content variation.

林力涛, 孙学凯, 于占源, 王克林, 曾德慧. 氮添加对沙质草地微生物呼吸与根系呼吸的影响[J]. 应用生态学报, 2016, 27(7): 2189-2196.

LIN Li-tao, SUN Xue-kai, YU Zhan-yuan, WANG Ke-lin, ZENG De-hui. Effects of nitrogen addition on microbial respiration and root respiration in a sandy grassland.[J]. Chinese Journal of Applied Ecology, 2016, 27(7): 2189-2196.

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氮添加对沙质草地微生物呼吸与根系呼吸的影响

Effects of nitrogen addition on microbial respiration and root respiration in a sandy grassland.

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