中国农业气象 ›› 2012, Vol. 33 ›› Issue (04): 505-511.doi: 10.3969/j.issn.1000-6362.2012.04.006

• 论文 • 上一篇    下一篇

UV-B辐射增强对不同品种大麦田土壤微生物量碳和土壤呼吸的影响

娄运生，顾夏天，周文鳞，桑友伟   

  1. 1南京信息工程大学江苏省农业气象重点实验室/南京信息工程大学应用气象学院，南京210044；2南京信息工程大学大气物理学院，南京210044
  • 收稿日期:2012-03-02 出版日期:2012-11-20 发布日期:2013-02-26
  • 作者简介:娄运生（1968-），河南睢县人，博士，教授，主要从事生态环境气象、全球变化生态学研究。Email：yunshlou@yahoo.com.cn
  • 基金资助:
    国家自然科学基金项目（40871151）；江苏省自然科学基金（BK2009413）；教育部博士点基金项目（20103228110003）；江苏省“青蓝工程”项目

Effect of Elevated Ultraviolet-B Radiation on Content of Microbial Biomass C and Soil Respiration in Three Barley Cultivars Field

LOU Yun sheng, GU Xia tian, ZHOU Wen lin, SANG You wei   

  1. 1Jiangsu Key Laboratory of Agricultural Meteorology / College of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing210044,China;2College of Atmospheric Physics,Nanjing University of Information Science and Technology, Nanjing210044
  • Received:2012-03-02 Online:2012-11-20 Published:2013-02-26

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1149

被引次数

3

摘要： 利用田间模拟UV-B辐射装置，从大麦分蘖期开始进行UV-B辐射增强处理，以后各主要生育期各选择一典型日分别观测作物根际、非根际土壤微生物量碳含量和土壤呼吸速率。UV-B辐射设对照（Ambient）和增强（Elevated，14.4kJ·m-2·d-1)两个水平，增强处理相当于南京地区4-5月自然光UV-B辐射量的120%。3个大麦品种分别为单2号、苏啤3号和苏啤4号。结果表明：3个品种中作物根际、非根际土壤微生物量碳含量均随生育进程表现出一致的规律，即分蘖、拔节、孕穗和抽穗期逐渐增加并达到最大值，成熟期则显著下降，UV-B辐射增强没有改变这种变化趋势；UV-B辐射增强后，各品种在多数生育时期观测的根际与非根际土壤微生物量碳含量显著低于对照（自然光）(P＜0.05），而单2号和苏啤4号在孕穗期（4月23日）观测的非根际土壤微生物量碳含量却明显高于对照(P＜0.05）；UV-B辐射增强条件下，单2号在孕穗期和成熟期、苏啤3号在抽穗期与成熟期观测的土壤呼吸速率显著低于对照（P＜0.05），其它阶段的差异不显著，各处理中土壤呼吸速率由分蘖到拔节、孕穗、抽穗期逐渐增加，抽穗期、成熟期逐渐下降的趋势没有改变；在UV-B辐射增强条件下，单2号和苏啤3号两个品种的Q10值显著低于对照（P＜0.05），苏啤4号的Q10值则显著增大，明显高于其它品种（P＜0.05）。研究认为，不同大麦品种土壤微生物量碳和土壤呼吸速率对UV-B辐射增强的响应存在差异。

关键词: UV-B辐射, 大麦, 根际, 非根际, 土壤微生物量碳, 土壤呼吸, Q10

Abstract: Field simulating experiment was conducted to investigate the effects of elevated UV-B radiation on the content of microbial biomass C in rhizosphere and non rhizosphere soils as well as soil respiration in three barley cultivars.The elevated UV-B radiation was treated from tillering stage until maturity stage.Soil microbial biomass C and soil respiration were measured at main growth stages.The experiment was designed with two UV-B radiation levels,i.e. ambient (A,control)and elevated by 120% (E,14.4kJ·m-2·d-1).The tested barley cultivars were Dan 2, Supi 3 and Supi 4.The results indicated that,microbial biomass C in three barley rhizosphere and non rhizosphere soils changed with growth stages and showed the same tendency,i.e. gradually increased from tillering,jointing to booting,and then reached the peak value at heading stage,but significantly decreased at maturity stage,similarly,elevated UV-B radiation had no effect on the above tendency.Compared with control,elevated UV-B radiation significantly reduced microbial biomass C in rhizosphere and non rhizosphere soils in most growth stages of three tested cultivars,but obviously increased microbial biomass C in non rhizosphere soils of cultivar Dan 2 and cultivar Supi 4 at booting stage (P＜0.05).Soil respiration rate was significantly lower under elevated UV-B radiation than that under control at booting and maturity stage of cultivar Dan 2,as well as at heading and maturity stage of cultivar Supi 3,no significant differences existed during other stages.Soil respiration rate gradually increased from tillering,jointing,booting to heading stage,but gradually decreased from heading to maturity stage,regardless of UV-B radiation.Compared to control,elevated UV-B radiation significantly reduced temperature sensitivity coefficients (Q10)of cultivar Dan 2 and cultivar Supi 3,but significantly enhanced Q10 of cultivar Supi 4,which was clearly higher than that of other two cultivars (P＜0.05).It is suggested that the different responses of microbial biomass C and soil respiration to elevated UV-B radiation existed among the three barley cultivars.

Key words: UV-B radiation, Barley, Rhizosphere, Non rhizosphere, Microbial biomass C, Soil respiration, Q10

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