Soil microbial functional and diversity under typical artificial woodlands in the hilly area of the Loess Plateau
Soil microbial functional and diversity under typical artificial woodlands in the hilly area of the Loess Plateau
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作者：
H. Chan
为探讨不同人工林地对土壤微生物生物量及微生物功能多样性的影响，以陕西省延安市杨圈沟流域黄土高原丘陵区的3片人工林地（刺槐、沙棘、山杏）为研究对象，发现3片人工林地土壤微生物生物量碳（MBC）和微生物生物量刺槐氮（MBN）均最高。代表土壤微生物代谢活性的平均显色度（AWCD）与MBC变化趋势相似，顺序为刺槐、沙棘、山杏。AWCD也与微生物量、全氮、土壤水分显着相关。3种人工林地微生物功能多样性差异不显着。显着；Shannon-Winner指数为刺槐和沙棘，与微生物生物量或土壤理化特征没有明显相关性。得出以下结论：（1）3种人工林地中，刺槐的微生物生物量和活性最高；（2）不同人工林地对土壤微生物多样性没有显着影响。
To investigate the effects of different artificial woodlands on soil microbial biomass and microbial functional diversity,a case study was done on three artificial woodlands(Robinia pseudoacacia,Hippophae reamnoides,and Prunus armeniaca)in the hilly area of the Loess Plateau,located at the Yangjuangou catchment,Yanan city,Shannxi.Among the three artificial woodlands,we found soil microbial biomass carbon(MBC)and microbial biomass nitrogen(MBN)of Robinia pseudoacacia were both highest.The average well color development(AWCD),which represents soil microbial metabolic activity,followed a similar trend with MBC,in the order of Robinia pseudoacacia Hippophae reamnoidesPrunus armeniaca.AWCD was also significantly correlated with microbial biomass,total nitrogen,and soil moisture.The difference in microbial functional diversity among the three artificial woodlands was not significant;Shannon-Winner index was Robinia pseudoacaciaPrunus armeniacaHippophae reamnoides and did not have obvious correlations with microbial biomass or soil physiochemical characteristics.We draw the following conclusions:(1)among three artificial woodlands,Robinia pseudoacacia had the most microbial biomass and activity;(2)there were no significant effects of the different artificial woodlands on soil microbial diversity.