摘要
[目的]探究毛竹林下不同盖度芒萁对土壤酶活性及生态化学计量特征的影响。[方法]在亚热带选取低芒萁盖度(PE:7.75%)和高芒萁盖度(DD:63.25%)的毛竹林为研究对象,测定土壤团聚体不同粒径碳(C)、氮(N)、磷(P)含量、参与土壤C、N、P循环的酶活性及其生态化学计量特征(E_(C:N:P))和不同类群微生物量。[结果](1)PE和DD样方土壤β-葡糖苷酶活性和N-乙酰-葡糖苷酶活性无显著差异,与PE样方相比,DD样方显著增加了亮氨酸氨基肽酶、酸性磷酸酶和多酚氧化酶活性,但显著降低了过氧化物酶活性,且这种差异主要在大团聚体和中团聚体。(2)与PE样方团聚体粒径间E_(C:N)和E_(N:P)无差异不同,DD样方微团聚体E_(C:N)显著高于大和中团聚体,而E_(N:P)显著低于大和中团聚体;大和中团聚体E_(C:N:P)在PE和DD样方之间无显著变差异,但DD样方微团聚体的E_(N:P)和E_(C:P)显著低于PE样方。(3)除丛枝菌根真菌和放线菌分别调控PE和DD样方土壤酶活性变异外,土壤全磷含量(TP)也是影响DD样方酶活性变异的主要因子;此外,土壤全氮含量(TN)和TP分别是调控大团聚体和中团聚体土壤酶活性变异的重要因子,且大团聚体土壤酶活性变异亦受到真菌生物量影响。[结论]毛竹林下不同盖度芒萁群落显著改变了土壤团聚体不同粒径参与C、N、P循环的酶活性及其生态化学计量特征,研究区生态系统同时受到C和P的限制作用,但P限制作用更强,且高盖度的芒萁种群加剧了该作用。
[Objective]To explore the effects of different coverage of Dicranopteris dichoyoma on soil enzyme 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(E_(C:N:P))and microbial biomass 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 inβ-glucosidase and N-acetyl-glucosaminidase activities between PE and DD sites.The activities of Leucine-amino-peptidase,acid phosphatase and phenoloxidase 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 difference in E_(C:N) and E_(N:P) between different soil aggregates in PE site,but E_(C:N) in microaggregate was significantly higher than that in large and small marcroaggregates,while E_(N:P) in microaggregate was significantly lower than that in large and small marcroaggregates in DD site.The E_(C:N:P) in large and small marcroaggregates in DD site equaled to that in PE site,but compare to PE site,the E_(N:P) and E_(C:P) in microaggregate significantly decreased in DD site.(3)In addition to arbuscular mycorrhizal fungi and actinomycetes regulating 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 marcroaggregates,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 ecological stoichiometric characteristics vary with the coverage of Dicranopteris dichoyoma population in Phyllostachys edulis forest,and the moso bamboo ecosystem is co-limited by both C and P,but the P restriction is more stronger,and the limited effect is exacerbated under high coverage of Dicranopteris dichoyom population in the study area.
作者
董国鑫
黄雪蔓
王一
任立宁
DONG Guo-xin;HUANG Xue-man;WANG Yi;REN Li-ning(College of Forestry,Guangxi University,Nanning 530004,Guangxi,China;Key Laboratory of Bamboo and Rattan Science and Technology,State Forestry and Grassland Administration,Institute for Resources and Environment,International Centre for Bamboo and Rattan,Beijing 100102,China;Changning Bamboo Forest Ecosystem Research Station,Yibin 644000,Sichuan,China;Research Institute of Forestry,Chinese Academy of Forestry,Beijing 100091,China)
出处
《林业科学研究》
CSCD
北大核心
2024年第1期183-193,共11页
Forest Research
基金
国际竹藤中心基本科研业务费专项资金项目(1632019015、1632021023)。
关键词
毛竹
芒萁
土壤团聚体
土壤酶
生态化学计量特征
Phyllostachys edulis
Dicranopteris dichoyoma
soil aggregate
soil enzyme
ecological stoichiometric characteristics
