积雪减少和氮添加对华北退化沙荒地土壤细菌群落结构多样性及网络拓扑结构的影响

打开文本图片集

中图分类号：S154.2 文献标识码：A 文章编号：1007-0435（2025）12-3874-1

引用格式：徐恒康，付尧，陈超，等，积雪减少和氮添加对华北退化沙荒地土壤细菌群落结构多样性及网络拓扑结构的影响 [J].草地学报，2025，33（12）：3874—3884 XU Heng-kang，FU Yao，CHENChao，etal.Efects of snowcover reductionand nitrogen addition on soil bacterial communities indegraded sandy wasteland in North China[J].Acta Agrestia Sinica，2O25，33（12）：3874-3884

Effects of Snow Cover Reduction and Nitrogen Addition on Soil Bacterial Communities in Degraded Sandy Wasteland in North China

XU Heng-kang ，FU Yao ， CHEN Chao ，PANG Zhuo ， ZHANG Guo-fang ， ZHANG Wei-wei ， LU Hui1，SUN Xin-bo ，KAN Hai-ming  （1.Instituteodoaoere; 2.ColegefoebeicuralUiesitodgberoveaendiga University，Urumqi，Xinjiang 830o52，China）

Abstract：Global climate change had reduced snowpack and increased nitrogen（N）deposition， jointly threaten ing northern ecosystems.Inthis study，we investigated the short-term（l-year）effects ofsnow cover/removal and N addition （50kg⋅ha-1）/ no addition（two-factor field experiment，4 treatments × 4 replicates）on soil bacterial community structure，diversity，and network stability in a degraded sandy wasteland in North China. The results showed that N addition （CKN1） significantly increased soil nitrate nitrogen （ |NO3- -N）（ P< 0.05），microbial biomass carbon（MBC）（ .P<0.05 ），and notably elevated the Sobs index of the bacterial community ⋅P<0.01 .Conversely，snowremoval（SoNO） significantly decreasedMBC（ P<0.01 ）.Redundancy analysis（RDA） identified NO3---N ，ammonium nitrogen （NH4+-N） ，and available potassium（AK）as key drivers of community structural changes，with Methylomirabilota and NB1- ⋅j relative abundance showing significant positive correlations with NO3- -N（ .P<0.01 .Molecular ecological network analysis revealed that both N addition and snow removal enhanced network complexity. Therefore，snow reduction and N deposition synergistically affect soil microbial community structure and network stability by regulating key environmental factors，providing a scientific basis for ecological restoration of sandy wastelands.

Key Words：Changes insnowfall; Microbial diversity;Soil physical and chemical properties;Soil bacterial community structure;Molecular ecological network

全球气候变化正以前所未有的速度影响陆地生态系统的结构与功能[1]。（剩余22831字）