Snowpack shifts cyanobacterial community in biological soil crusts  

作　　者：ZHANG Bingchang ZHANG Yongqing ZHOU Xiaobing LI Xiangzhen ZHANG Yuanming 

机构地区：[1]Geographical Science College,Shanxi Normal University,Linfen 041004,China [2]State Key Laboratory of Desert and Oasis Ecology,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China [3]Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation,College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou 350002,China

出　　处：《Journal of Arid Land》2021年第3期239-256,共18页干旱区科学（英文版）

基　　金：This study was supported by the National Natural Science Foundation of China(U2003014,41977099,419901134);the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA2005020402);the 13th Fiveyear Informatization Plan of the Chinese Academy of Sciences(XXH13503-03-106);the China Biodiversity Observation Networks(Sino BON).

摘　　要：Winter snowpack is an important source of moisture that influences the development ofbiological soil crusts(BSCs)in desert ecosystems.Cyanobacteria are important photosynthetic organismsin BSCs.However,the responses of the cyanobacterial community in BSCs to snowpack,snow depth andmelting snow are still unknown.In this study,we investigated the cyanobacterial community compositionand diversity in BSCs under different snow treatments(doubled snow,ambient snow and removed snow)and three snow stages(stage 1,snowpack;stage 2,melting snow;and stage 3,melted snow)in theGurbantunggut Desert in China.In stages 1 and 2,Cyanobacteria were the dominant phylum in the bacterialcommunity in the removed snow treatment,whereas Proteobacteria and Bacteroidetes were abundant inthe bacterial communities in the ambient snow and doubled snow treatments.The relative abundances ofProteobacteria and Bacteroidetes increased with increasing snow depth.The relative abundances ofCyanobacteria and other bacterial taxa were affected mainly by soil temperature and irradiance.In stages 2and 3,the relative abundance of Cyanobacteria increased quickly due to the suitable soil moisture andirradiance conditions.Oscillatoriales,Chroococcales,Nostocales,Synechococcales and unclassifiedCyanobacteria were detected in all the snow treatments,and the most dominant taxa were Oscillatorialesand Chroococcales.Various cyanobacterial taxa showed different responses to snowpack.Soil moisture andirradiance were the two critical factors shaping the cyanobacterial community structure.The snowpackdepth and duration altered the soil surface irradiance,soil moisture and other soil properties,whichconsequently were selected for different cyanobacterial communities.Thus,local microenvironmentalfiltering(niche selection)caused by snow conditions may be a dominant process driving shifts in thecyanobacterial community in BSCs.

关 键 词：cyanobacterial diversity community structure biological soil crusts SNOWPACK niche selection 

分 类 号：P426.635[天文地球—大气科学及气象学] S154.3[农业科学—土壤学]