Soil Enzyme Activities and Ecological Stoichiometric Characteristics under Two Coverage of Dicranopteris dichoyoma in Phyllostachys edulis Forest
[Objective]To explore the effects of different coverage of Dicranopteris dichoyoma on soil en-zyme activities and ecological stoichiometric characteristics in Phyllostachys edulis forest.[Method]The content of soil organic carbon(C),total nitrogen(N),total phosphorus(P),soil enzyme activities involved in soil C,N,and P cycling,soil enzyme ecological stoichiometric characteristics(EC:N:P)and microbial bio-mass of different groups in soil aggregates were measured in moso bamboo forests with low Dicranopteris dichoyoma coverage(PE:7.75%)and high Dicranopteris dichoyoma coverage(DD:63.25%),respectively.[Results](1)There was no significant difference in β-glucosidase and N-acetyl-glucosaminidase activities between PE and DD sites.The activities of Leucine-amino-peptidase,acid phosphatase and phenoloxi-dase significantly increased,but the activity of peroxidase significantly decreased in DD site,compared to PE site,which mainly occurred in large and small marcroaggregates.(2)There was no significant differ-ence in EC:N and EN:P between different soil aggregates in PE site,but EC:N in microaggregate was signific-antly higher than that in large and small marcroaggregates,while EN:P in microaggregate was significantly lower than that in large and small marcroaggregates in DD site.The EC:N:P in large and small marcroag-gregates in DD site equaled to that in PE site,but compare to PE site,the EN:P and EC:P in microaggregate significantly decreased in DD site.(3)In addition to arbuscular mycorrhizal fungi and actinomycetes regu-lating the variation of soil enzyme activities in PE and DD sites,soil total phosphorus content(TP)is also a major factor affecting the variation of enzyme activities in DD site.Soil total nitrogen content(TN)and TP were important factors in regulating the variation of soil enzyme activities in large and small marcroaggreg-ates,respectively,and the variation of soil enzyme activity in large marcroaggregate was also affected by fungal biomass.[Conclusion]The responses of soil enzyme activities in different soil aggregates and eco-logical stoichiometric characteristics vary with the coverage of Dicranopteris dichoyoma population in Phyl-lostachys edulis forest,and the moso bamboo ecosystem is co-limited by both C and P,but the P restric-tion is more stronger,and the limited effect is exacerbated under high coverage of Dicranopteris dichoyom population in the study area.
万方数据
维普
