The Vegetation and Soil Microorganism Characteristics of Different Degraded Grassland in Gannan Steppe
LI Xue-ping1, LI Jian-hong2, LIU Yong-gang1, FAN Yu-xuan2, ZHAO Shu-dong2, LI Min-quan1
1. Institute of Plant Protection, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu Province 730070, China; 2. College of Prataculture, Gansu Agricultural University, Lanzhou, Gansu Province 730070, China
Abstract：In order to study the effects of grassland degradation on vegetation and soil microorganisms,alpine grassland in Luqu county,Gannan prefecture was taken as the research object. The indexes of plant species,vegetation height,coverage,species richness and fresh grass yield in grassland at different degree of degradation were investigated. And the indexes of soil respiration intensity,soil microbial biomass carbon content and soil respiration entropy were measured. The results showed that with the aggravation of grassland degradation,the plant species in alpine grassland tended to decrease,and the species of dominant plants changed,such as Ligularia virgaurea,Oxytropis ochrocephala,Thermopsis lanceolata and other poisonous weeds appeared. And the vegetation height,coverage,plant number,fresh grass yield and other indicators showed a downward trend. The indexes of soil basal respiration and induced respiration,soil microbial biomass carbon and soil metabolic entropy all decreased at different degrees. The content of soil total phospholipid fatty acid (PLFA),soil bacteria and actinomycetes decreased,while the content of fungi increased. The soil microbial community structure changed and the pressure index increased. The correlation analysis showed that there were different degrees of correlation between vegetation and soil microorganisms. Soil fungi and microbial pressure index were negatively correlated with vegetation and other factors of soil microorganisms,while other factors were positively correlated. This study shows that the succession of vegetation is closely related to the change of soil microorganism in alpine grassland degradation.
李雪萍, 李建宏, 刘永刚, 范雨轩, 赵树栋, 李敏权. 甘南草原不同退化草地植被和土壤微生物特性[J]. 草地学报, 2020, 28(5): 1252-1259.
LI Xue-ping, LI Jian-hong, LIU Yong-gang, FAN Yu-xuan, ZHAO Shu-dong, LI Min-quan. The Vegetation and Soil Microorganism Characteristics of Different Degraded Grassland in Gannan Steppe. Acta Agrestia Sinica, 2020, 28(5): 1252-1259.
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2020, Vol. 28 
