民勤荒漠草地3种典型植物群落土壤微生物及酶活性研究  

Soil Microorganisms and Enzyme Activities in Three Typical Plant Communities in Desert Grasslands of Minqin County

作　　者：王方琳[1,2] 王理德 陈思航[1] 吴昊 郭春秀[1] 贺访印[1] 柴成武[1] WANG Fanglin;WANG Lide;CHEN Sihang(Institute of Desert Control Research in the Gansu Province,Lanzhou,Gansu 730000,China;Key Laboratory of Desertification Control in the Gansu Province,Wuwei,Gansu 733000,China)

机构地区：[1]甘肃省治沙研究所,甘肃兰州730000 [2]甘肃省荒漠化防治重点实验室,甘肃武威733000

出　　处：《中国水土保持》2025年第4期55-60,67,I0007,共8页Soil and Water Conservation in China

基　　金：国家自然科学基金项目(U23A2061);甘肃省级人才重点项目(GZTZ20240415);国家林业和草原局“三北工程攻坚战关键技术研发”揭榜挂帅项目(202401-05);甘肃省第二批陇原青年英才项目。

摘　　要：为研究民勤荒漠草地不同植物群落土壤系统的结构和功能,以石羊河下游民勤荒漠草地退耕区藜群落、盐生草群落、黑果枸杞群落3种植物群落为研究对象,S形取样地中0~40 cm的土样,测定、分析各群落中土壤微生物量碳、氮、磷含量,微生物数量及酶活性变化特征,结果表明:3种植物群落中土壤微生物量碳、氮、磷含量,微生物数量和土壤酶活性均表现为0~<20 cm土层>20~40 cm土层;各群落之间,土壤微生物量氮含量在黑果枸杞群落中最大,而土壤微生物量磷含量在藜群落与盐生草群落中差异不大;土壤微生物数量中,细菌、真菌、放线菌数量均表现为藜群落>黑果枸杞群落>盐生草群落;在3种群落中土壤微生物量碳、氮、磷含量变化较为复杂,其中盐生草群落土层0~<20 cm土壤微生物量碳含量最大;不同植物群落不同空间层次土壤微生物量碳、氮、磷含量,微生物数量及酶活性之间有不同程度的相关性,反映了土壤系统各养分因子间的复杂关系。To study the structure and function of the soil system in different plant communities in desert grasslands of Minqin County,taking three plant communities(Chenopodium album community,Halogeton glomeratus community,and Lycium ruthenicum community)in the abandoned farmland area in desert grasslands of Minqin County of the lower Shiyang River,the paper collected soil samples by S-shaped from 0-40 cm depth,and measured and analyzed the soil microbial biomass carbon,nitrogen,and phosphorus content,microbial biomass,and enzyme activity characteristics.The results showed that:a)in all three plant communities,the soil microbial biomass carbon,nitrogen,and phosphorus content,microbial biomass,and soil enzyme activity were higher in the 0-<20 cm soil layer than in the 20-40 cm layer;b)among the communities,the soil microbial biomass nitrogen content was highest in the Lycium ruthenicum community,while the soil microbial biomass phosphorus content showed little difference between the Chenopodium album community and Halogeton glomeratus community;c)in terms of microbial biomass,the number of bacteria,fungi,and actinomycetes was highest in the Chenopodium album community,followed by the Lycium ruthenicum community,and lowest in the Halogeton glomeratus community;d)the changes in soil microbial biomass carbon,nitrogen,and phosphorus content were complex among the three communities,with the highest soil microbial biomass carbon content in the 0-<20 cm layer of the Halogeton glomeratus community;e)there were different degrees of correlation between soil microbial biomass carbon,nitrogen,and phosphorus content,microbial biomass,and enzyme activity across different spatial layers and different plant communities,reflecting the complex relationships among soil nutrient factors.

关 键 词：土壤微生物 土壤酶 植物群落 荒漠草地 民勤县 

分 类 号：S157[农业科学—土壤学]