川西亚高山天然次生林不同演替阶段土壤-微生物生物量及其化学计量特征  

Soil and soil microbial biomass contents and C∶N∶P stoichiometry at different succession stages of natural secondary forest in sub-alpine area of western Sichuan, China

作　　者：胡宗达 刘世荣[2] 刘兴良[3] 胡璟 罗明霞 李亚非 石松林 吴德勇 肖玖金[6] HU Zongda;LIU Shirong;LIU Xingliang;HU Jing;LUO Mingxia;LI Yafei;SHI Songlin;WU Deyong;XIAO Jiujin(College of Resources,Sichuan Agricultural University,Chengdu 611130,China;Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration,Research Institute of Forest Ecology,Environment and Protection,Chinese Academy of Forestry,Beijing 100091,China;Sichuan Academy of Forestry,Chengdu 610081,China;College of Resources and environment,Hunan Agricultural University,Changsha 410128,China;College of tourism and urban-rural planning,Chengdu University of Technology,Chengdu 610059,China;College of Forestry,Sichuan Agricultural University,Chengdu 611130,China)

机构地区：[1]四川农业大学资源学院,成都611130 [2]中国林业科学研究院森林生态环境与保护研究所,国家林业和草原局森林生态环境重点实验室,北京100091 [3]四川省林业科学研究院,成都610081 [4]湖南农业大学资源环境学院,长沙410128 [5]成都理工大学旅游与城乡规划学院,成都610059 [6]四川农业大学林学院,成都611130

出　　处：《生态学报》2021年第12期4900-4912,共13页Acta Ecologica Sinica

基　　金：国家重点研发计划(2017YFC0505004);四川省环境治理与生态保护重大科技专项(2018SZDZX0031);森林和湿地生态恢复与保育四川重点实验室开放课题(2019KFKT03)。

摘　　要：开展不同恢复演替阶段天然次生林土壤-微生物生物量及其化学计量特征关系的研究,可为有效和持续管理川西亚高山次生林提供科学依据。以川西亚高山米亚罗林区20世纪60、70、80年代3种采伐迹地经自然恢复演替形成的次生林(SF60、SF70和SF80)和岷江冷杉(Abies faxoniana)原始林(PF)为研究对象,探讨了表层(0—20 cm)土壤有机碳(C_(soil))、全氮(N_(soil))、全磷(P_(soil))含量及微生物生物量碳(C_(mic))、氮(N_(mic))、磷(P_(mic))含量随自然恢复演替的变化特征,分析了它们的化学计量比与微生物熵(qMB)之间的相互关系。结果表明:(1)随着恢复演替年限的增加,C_(soil)和N_(mic)含量显著降低,N_(soil)和P_(soil)及C_(mic)和P_(mic)含量呈现先升后降的显著变化趋势,且3种次生林的表层土壤碳、氮、磷及其微生物生物量的含量均低于PF。(2)次生林恢复年限对土壤微生物熵C(qMBC)和P(qMBP)没有显著影响,但对土壤微生物熵N(qMBN)存在显著影响。(3)土壤-微生物化学计量不平衡性Cimb∶N_(imb)随自然恢复演替进程呈先降后升的显著变化趋势,Cimb∶P_(imb)呈不显著的降低趋势,N_(imb)∶P_(imb)呈现显著降低趋势。冗余分析显示,N_(imb)∶P_(imb)和C_(mic)∶N_(mic)是影响qMB变化的主导因子,其中N_(imb)∶P_(imb)解释了qMB变化的62.6%,说明土壤氮磷及其活性组分(N_(mic)和P_(mic))含量变化可能会影响到qMB变化。综上可知,次生林近60年的自然恢复演替引起了土壤碳氮磷含量的显著变化;天然次生林土壤-微生物生物量碳氮磷化学计量比主要受到氮磷的协同影响,且SF60土壤质量状况较差,为此,对SF60林分可适当增加氮素供给以促进其林木生长,进而提升土壤质量。The change characteristics of soil and soil microbial biomass contents of the natural secondary forests could significantly affect the soil organic carbon(C_(soil)), total nitrogen(N_(soil)), total phosphorus(P_(soil)), soil microbial biomass carbon(C_(mic)), microbial biomass nitrogen(N_(mic)), microbial biomass phosphorus(P_(mic)) contents, and their stoichiometry. To gain insights into the change characteristics of soil and soil microbial biomass contents and their stoichiometry along different successional stages of natural secondary forest, four forest types were selected in Miyaluo forest area of western Sichuan, China, which compose of three natural secondary forests(SF60, SF70 and SF80 from clear-logging area during the 1960 s, 1970 s and 1980 s, respectively) and one Abies faxoniana primary forest(PF, 160 years old). C_(soil), N_(soil) and P_(soil), C_(mic), N_(mic) and P_(mic) in 0—20 cm soil were measured. The results showed that contents of C_(soil) and N_(mic) marginally significantly decreased, whereas the contents of N_(soil) and P_(soil), C_(mic) and P_(mic) increased initially but decreased over time late in the course of restorative succession of natural secondary forests. The contents of C_(soil), N_(soil), P_(soil), C_(mic), N_(mic), and P_(mic) in the three natural secondary forests were lower than those in the PF, while the contents of C_(soil), N_(soil) and soil microbial biomass had no significant changes between SF80 and SF70. The content of P_(soil) was significantly higher in SF70 than that in SF80. The soil C∶N∶P stoichiometry ratio was dominated by the synergy effect interaction of N_(soil) and P_(soil) contents. There was no obvious difference among forests of different successional stages for soil microbial nitrogen carbon quotient(qMBC) and phosphorus quotient(qMBP), but did exist for soil microbial nitrogen quotient(qMBN). qMBN was significantly greater in SF60 than that in the other two successional stages and PF. Cimb∶N_(imb) ratio of the stoichiometric imbalances showed

关 键 词：天然次生林 土壤微生物生物量 化学计量比 微生物熵 化学计量不平衡性 自然恢复演替 

分 类 号：S714[农业科学—林学]