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当前位置: 首页 > 文章 > 荒漠草地土壤微生物生物量和微生物熵对沙漠化的响应 应用生态学报 2019,30 (8) 2691-2698
Position: Home > Articles > Response of soil microbial biomass and microbial entropy to desertification in desert grassland Chinese Journal of Applied Ecology 2019,30 (8) 2691-2698

荒漠草地土壤微生物生物量和微生物熵对沙漠化的响应

作  者：
吴秀芝;刘秉儒;阎欣;刘任涛;安慧
单  位：
宁夏大学西北土地退化与生态恢复省部共建国家重点实验室培育基地/西北退化生态系统恢复与重建教育部重点实验室
关键词：
荒漠草地;沙漠化;土壤微生物生物量;微生物熵;化学计量不平衡性
摘  要：
采用空间序列代替时间演替的方法,分析宁夏中北部盐池县荒漠草地不同沙漠化阶段(荒漠草地、固定沙地、半固定沙地和流动沙地)土壤微生物生物量(SMB)和微生物熵(qMB)的变化特征及其影响因子.结果表明:从荒漠草地到流动沙地,土壤微生物生物量碳、氮、磷分别降低46.1%、80.8%和30.0%.随着荒漠草地沙漠化程度的加剧,土壤微生物熵碳(qMBC)、土壤微生物熵氮(qMBN)、土壤微生物熵磷(qMBP)均表现为荒漠草地>固定沙地>半固定沙地>流动沙地,而土壤-微生物化学计量不平衡性(C∶N_(imb)、C∶P_(imb)、N∶P_(imb))基本呈增加趋势.土壤微生物生物量氮与C∶N_(imb)呈显著正相关,与N∶P_(imb)呈显著负相关;土壤微生物生物量磷与C∶P_(imb)呈显著正相关.冗余分析(RDA)显示,土壤生态化学计量(C∶N、C∶P)对微生物熵碳的负效应最明显.荒漠草地沙漠化显著影响土壤微生物生物量和微生物熵.
译  名：
Response of soil microbial biomass and microbial entropy to desertification in desert grassland
作  者：
WU Xiu-zhi;LIU Bing-ru;YAN Xin;LIU Ren-tao;AN Hui;Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China/Ministry of Education Key Laboratory for Restoration and Reconstruction of Degraded Ecosystem in Northwest China, Ningxia University;
关键词：
desert grassland;;desertification;;soil microbial biomass;;microbial entropy;;stoichio-metry imbalance
摘  要：
Using an approach of spatial sequence instead of temporal succession, we investigated the variation and driving factors of soil microbial biomass and microbial entropy in desert grasslands across four different desertification stages(grassland, fixed dune, semi-fixed dune and mobile dune) in Yanchi County, Ningxia, China. The results showed that soil microbial biomass carbon, nitrogen and phosphorus reduced by 46.1%, 80.8% and 30.0% from grassland to mobile dunes, respectively. The soil microbial entropy(qMBC, qMBN, and qMBP) decreased but soil-microbial stoichiometry imbalance(C:N_(imb), C:P_(imb) and N:P_(imb)) generally increased with the development of desertification. There were significantly positive relationship between soil microbial biomass nitrogen and C:N_(imb), soil microbial biomass phosphorus and C:P_(imb), while negative relationship between soil microbial biomass nitrogen and N:P_(imb). The RDA result showed that soil ecological stoichiometry(C:N, C:P) had the strongest negative effect on soil microbial entropy carbon(qMBC). Soil microbial biomass and microbial entropy were significantly affected by desertification in desert grassland.

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