古尔班通古特沙漠土壤微生物碳氮对环境因子的响应

doi:10.13866/j.azr.2018.03.03

摘要/Abstract

摘要： 为理解大气氮沉降、降雨和气候变暖对温带沙漠不同季节的土壤微生物碳氮(MBC,MBN)的影响,2014年9月在古尔班通古特沙漠开展了基于降水、氮沉降和增温相结合的多因子控制实验。结果表明:仅模拟降水对各个季节的微生物量碳(MBC)和氮(MBN)以及MBC/MBN比值没有显著影响;土壤MBC,MBN和MBC/MBN比值整体上随着氮添加而增加,其中以2015年秋季高氮对MBC,MBN和MBC/MBN比值的影响显著;仅增温降低了2015年秋季和2016年春季的MBC,MBN和MBC/MBN比值,而显著增加了2016年夏季的MBC,MBN和MBC/MBN比值;水氮交互作用在各个季节都能显著影响MBC,MBN和MBC/MBN比值,但水氮温交互对MBC,MBN和MBC/MBN比值影响并不显著。古尔班通古特沙漠土壤MBC/MBN比值介于1.52～4.34,表明在古尔班通古特沙漠土壤微生物群落中细菌占据优势。

关键词: 氮沉降, 降水, 增温, 土壤微生物, 生物量, 温带沙漠, 季节性变化, 古尔班通古特

Abstract: Soil microbial biomass plays a critical role in soil nutrient cycling and is sensitive to atmospheric nitrogen deposition,rainfall change pattern and global warming. However,the effects on soil microbial biomass,especially seasonal one,are still unclear.Therefore,a field multiple-factor experiment including precipitation increase,nitrogen addition and temperature increase was conducted in the Gurbantunggut Desert in September 2014 so as to understand the effects of atmospheric nitrogen deposition,precipitation and global warming on soil microbial biomass carbon(MBC)and nitrogen(MBN)in different seasons in temperate desert ecosystem.It was found that there were no seasonal differences in the responses of soil MBC and MBN and the ratio of MBC to MBN and simulated rainfall.The soil MBC and MBN and the ratio of MBC to MBN were positively correlated with nitrogen addition,and the high nitrogen in autumn 2015 affected significantly the MBC and MBN and the ratio of MBC to MBN.The temperature increase in autumn 2015 and spring 2016 decreased the soil MBC and MBN and the ratio of MBC to MBN,but increased significantly these in summer 2016.The precipitation and nitrogen increase affected interactively the seasonal soil MBC and MBN and the ratio of MBC to MBN,but the effects of interaction of nitrogen,precipitation and temperature increase on the seasonal soil MBC and MBN and the ratio of MBC to MBN were not significant.Owing to the ratio of MBC to MBN ranged from 1.52 to 4.34,our results suggested that bacteria were dominant in soil microbial community in the Gurbantunggut Desert.

Key words: nitrogen deposition, precipitation, temperature increase, soil microbial biomass, temperate desert, seasonal variation, Gurbantunggut Desert

吴文超, 岳平, 崔晓庆, 李凯辉, 刘学军. 古尔班通古特沙漠土壤微生物碳氮对环境因子的响应[J]. 干旱区研究, 2018, 35(3): 515-523.

WU Wen-chao, YUE Ping, CUI Xiao-qing, LI Kai-hui, LIU Xue-jun. Response of Soil Microbial Biomass Carbon and Nitrogen Deposition to Precipitation and Temperature in the Gurbantunggut Desert[J]. Arid Zone Research, 2018, 35(3): 515-523.

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