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冰川冻土 ›› 2017, Vol. 39 ›› Issue (1): 175-184.doi: 10.7522/j.issn.1000-0240.2017.0021

• 寒旱区生物学 • 上一篇    下一篇

冻融交替对不同年代排水造林湿地土壤微生物活性及有机碳密度的影响

郭冬楠, 臧淑英, 赵光影   

  1. 哈尔滨师范大学 黑龙江省普通高等学校地理环境遥感监测重点实验室, 黑龙江 哈尔滨 150025
  • 收稿日期:2016-08-20 修回日期:2016-12-20 出版日期:2017-02-25 发布日期:2017-06-03
  • 通讯作者: 臧淑英,E-mail:zsy6311@163.com. E-mail:zsy6311@163.com
  • 作者简介:郭冬楠(1991-),女,黑龙江伊春人,2014年毕业于哈尔滨师范大学,现为在读硕士研究生,从事冻融作用下湿地环境生态研究.E-mail:18346552692@163.com
  • 基金资助:
    国家自然科学基金项目(41301082;41571199);黑龙江省政府博士后资助经费项目(LRB13-200)资助

Effect of freezing and thawing cycles on soil microbial activity and organic carbon density in forest swamp wetland with various drainage afforestation years

GUO Dongnan, ZANG Shuying, ZHAO Guangying   

  1. Key Laboratory of Remote Sensing Monitoring of Geographic Environment, College of Heilongjiang Province, Harbin Normal University, Harbin 150025, China
  • Received:2016-08-20 Revised:2016-12-20 Online:2017-02-25 Published:2017-06-03

摘要: 以小兴安岭湿地土壤为研究对象,基于室内分析和冻融实验,分析了冻融作用下不同年代排水造林湿地土壤微生物量、酶活性以及有机碳密度的变化趋势,探讨了不同年代排水造林湿地土壤微生物活性与有机碳密度之间的相关关系,以期为深入认识冻融期间高寒高纬度地区土壤碳循环过程提供参考依据。结果表明:(1)冻融次数对土壤微生物量碳、氮含量影响显著(P<0.05),经历9次冻融循环后,土壤微生物量碳、氮含量比冻融前明显减少;在三种不同年代排水造林的湿地中,排水时间越短,土壤微生物量碳、氮含量下降幅度越大,表明长时间的反复冻融交替可能导致土壤微生物量的进一步减少。(2)冻融前后,土壤蔗糖酶和淀粉酶活性均表现为下降趋势,且多次冻融交替后,-25~5℃冻融处理比-5~5℃冻融处理酶活性更低,表明较大的冻融温差更能降低土壤酶的活性度。(3)随着冻融次数和冻融温度的变化,四种湿地的土壤有机碳密度基本保持稳定,但其与土壤微生物量、酶活性却存在着高度的正相关性,通过探究微生物活性所调控的土壤过程,可以直接或间接了解土壤有机碳密度的变化趋势,便于从本质上验证其响应机制。

关键词: 冻融交替, 排水造林, 微生物量, 酶活性, 有机碳

Abstract: Taking the wetland soil in the Xiaoxing'an Mountains as the object, changing trends of soil microbial biomass, enzyme activity and organic carbon density in forest swamp wetland with various drainage afforestation years under different freezing and thawing cycles were analyzed. The relation between soil microbial activity and organic carbon density was investigated in order to reveal the soil carbon cycle process in alpine-cold and high latitude regions during the freezing-thawing season. Freezing-thawing cycles has impacted significantly on microbial biomass carbon and nitrogen in soil (P<0.05). After nine freezing-thawing cycles, microbial biomass carbon and nitrogen in soil decreased obviously, and the shorter the drainage time, the more the decrease in microbial biomass carbon and nitrogen in soil, as showing in three different drainage afforestation wetlands. These reveal that repeated freezing and thawing would result in deeper degree of microbial biomass reduction for a long time. Before and after the freezing and thawing, soil invertase and amylase activities showed a declining trend. Compared to -5 to 5℃, -25 to 5℃ repetitive freezing-thawing treatment could decrease enzyme activity, which suggested that the larger range of freezing and thawing temperature would accelerate the activity reducing. With the change in number of freezing and thawing cycles and temperature, soil organic carbon density in the four wetlands was stable basically, but still remained positive correlations with microbial biomass and enzyme activity. Therefore, studying the regulating process of soil microbial activity is useful to understand, directly or indirectly, the change trend and verify the essential response mechanism of soil organic carbon density.

Key words: freezing-thawing cycle, drainage afforestation, microbial biomass, enzyme activity, organic carbon

中图分类号: 

  • S714