Soil microbial biomass and activity in relation to stand age of poplar shelterbelts
不同林龄杨树农田防护林土壤微生物生物量碳、氮和微生物活性

Taking 5-,10-,15-,and 20 years old poplar(Populus euramericana cv."N 3016")shelterbelts in Jianping County,Liaoning Province as test objects,the effects of establishing shelterbelts on the farmland soil microbial biomass carbon and nitrogen,and microbial activity were evaluated.After the establishment of sheherbelts,the concentrations of organic carbon and total nitrogen,the microbial biomass carbon and nitrogen,and the basal respiration in 0-15 cm soil layer increased after an initial decrease,being reached or exceeded the levels of the control after 20 years afforestation.The metabolic quotient increased significantly after 5 years afforestation,but decreased with increasing stand age.All the results suggested that under the effects of shelterbelt establishment,farmland soil microbial biomass and activity had obvious change.