复合群落土壤微生物和酶活性对大气CO<sub>2</sub>浓度和温度升高的响应

孟红娜<sup>1; 2</sup>; 王开运<sup>1; 2*</sup>; 邹春静<sup>1; 3</sup>; 张远彬<sup>4</sup>

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复合群落土壤微生物和酶活性对大气CO₂浓度和温度升高的响应
孟红娜^1,2, 王开运^1,2*, 邹春静^1,3, 张远彬⁴
1.上海市城市化生态过程与生态恢复重点实验室;2.华东师范大学资源与环境科学学院, 上海 200062;3.华东师范大学生命科学学院, 上海 200062;4.中国科学院成都生物研究所, 成都 610041

摘要:

应用自控、封闭、独立的生长室系统,研究川西亚高山林线复合群落根际、非根际土壤微生物数量以及根际、非根际土壤酶活性对大气CO₂浓度升高(环境CO₂浓度+350(±25)μmol·mol^-1,EC)和温度升高(环境温度+2.0(±0.5)℃,ET)及其两者同时升高(ECT)的响应。结果表明:(1)与对照(CK)相比,EC、ET和ECT处理能够增加土壤根际微生物数量,但不同微生物种类对EC、ET和ECT的反应有所差异。(2)不同种类的根际土壤酶对EC、ET和ECT的响应不同。(3)与CK相比,EC、ET和ECT的非根际土壤微生物数量以及非根际土壤酶活性均无显著提高。(4)EC、ET和ECT处理对复合群落土壤微生物总数的根际效应明显; 除ET处理的转化酶为负根际效应,其余处理的过氧化氢酶,脲酶及转化酶均表现为正根际效应。

关键词: CO₂浓度升高温度升高土壤微生物土壤酶复合群落

DOI：

分类号:Q948.1

Fund project:

Responses of soil microbes and enzyme of compound community to elevated atmospheric CO₂ concentration and temperature

MENG Hong-Na^1,2, WANG Kai-Yun^1,2*, ZOU Chun-Jing^1,3, ZHANG Yuan-Bin⁴

1.Shanghai Key Laboratory of Urbanization &2.Ecological Restoration;3.2.School of Resources and Environment Sciences, East China Normal University, Shanghai 200062, China;4.3.School of Life Sciences, East China Normal University, Shanghai 200062, China;5.4.Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China

Abstract:

With independent and top-enclosed chamber system,this paper studied the responses of rhizospheric microbes number and rhizospheric enzyme activity of compound community to elevated atmospheric CO₂ concentration(ambient+350(±25)μmol·mol^-1,EC),temperature(ambient+2(±0.5)℃,ET),and their combination(ECT)under high-frigid conditions of West Sichuan Province. The results showed that in comparing with the control,treatments EC,ET and ECT can increase the number of rhizospheric microbes. Highly significant differences were noticed among different treatments in rhizospheric microbes number and rhizospheric enzyme activity. In comparing with the control,treatment EC,ET and ECT had no effect on the number of non- rhizospheric microbes and non- rhizospheric enzyme activity. Rhizospheric effect of soil microbes,catalase and urease for all treatments was significant; rhizospheric effect of intertase of EC and ECT was significant,but rhizospheric effect of intertase of ET was not significant.

Key words: carbon dioxide enrichment elevated temperature soil microbes soil enzyme compound community