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作 者:丁苏雅 段敏 朱瀚卿 陈宇[4,5] 谭一波 马姜明[4,5] 田红灯 申文辉 DING Suya;DUAN Min;ZHU Hanqing;CHEN Yu;TAN Yibo;MA Jiangming;TIAN Hongdeng;SHEN Wenhui(Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation,Nanning 530002,China;Guangxi Lijiangyuan Forest Ecosystem Research Station,Guilin,Guangxi 541316,China;Guilin Xing’an Lijiangyuan Forest Ecosystem Observation and Research Station of Guangxi,Guilin,Guangxi 541316,China;Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection(Guangxi Normal University),Ministry of Education,Guilin,Guangxi 541006,China;Guangxi Key Laboratory of Landscape Resources Conservation and Sustainable Utilization in Lijiang River Basin,Guangxi Normal University,Guilin,Guangxi 541006,China)
机构地区:[1]广西优良用材林资源培育重点实验室,南宁530002 [2]广西漓江源森林生态系统国家定位观测研究站,广西桂林541316 [3]桂林兴安漓江源森林生态系统广西野外科学观测研究站,广西桂林541316 [4]广西师范大学珍稀濒危动植物生态与环境保护教育部重点实验室,广西桂林541006 [5]广西漓江流域景观资源保育与可持续利用重点实验室,广西师范大学,广西桂林541006
出 处:《土壤》2023年第4期795-803,共9页Soils
基 金:广西优良用材林资源培育重点实验室开放课题项目(2020-B-04-02);广西创新驱动发展专项(桂科AA20161002-1)资助。
摘 要:以广西壮族自治区桂林市华江乡内广泛分布的毛竹林土壤为研究对象,以竹生物质炭和竹凋落物作为外源碳,设置对照(CK)、低添加量生物质炭(1%BC)、高添加量生物质炭(2%BC)、低添加量凋落物(1%L)、高添加量凋落物(2%L)5个处理,进行为期两个月的室内培养试验,研究不同外源碳添加对毛竹林土壤营养元素和酶活性的影响。结果表明:与对照相比,竹生物质炭和竹凋落物添加均显著提高了土壤pH;竹生物质炭添加显著降低了而竹凋落物添加显著提高了土壤铵态氮(NH4+-N)含量(P<0.05),且高添加量(2%BC和2%L)的降低或提高作用更明显;不同外源碳添加均显著提高了土壤硝态氮(NO_(3)^(–)-N)含量,且凋落物添加的提高作用更明显;不同外源碳添加均显著提高了土壤有效磷(AP)含量,且高添加量的提高作用更明显;竹生物质炭添加对土壤可溶性有机碳(DOC)含量没有显著影响,但降低了土壤可溶性氮(DN)含量,而竹凋落物添加显著提高了土壤DOC和DN含量;不同外源碳添加对土壤微生物生物量碳(MBC)和氮含量(MBN)均没有显著影响,但降低了土壤蔗糖酶和脲酶活性。相关性分析表明,土壤pH、NH_(4)^(+)-N、NO_(3)^(-)-N、DOC和DN是影响竹林土壤酶活性的关键性因子。A two-month laboratory incubation experiment was conducted to explore effects of different exogenous carbon input on soil nutrients and enzyme activities with soil collected from Moso bamboo forest in Huajiang Township of Guilin City,Guangxi Province.Five treatments were setup,which included the control(CK),addition of bamboo biochar with a low rate(1%BC),addition of bamboo biochar with a high rate(2%BC),addition of bamboo litter with a low rate(1%L),and addition of bamboo litter with a high rate(2%L).The results showed that the addition of biochar and litter significantly increased soil pH compared with CK.The addition of biochar significantly decreased while the addition of litter significantly increased soil NH4+-N concentration(P<0.05),and the effects were more significant in the high addition rates(2%BC and 2%L)than in the low addition rates(1%BC and 1%L).The addition of different exogenous carbon significantly increased soil NO_(3)^(-)-N concentration,and the effect was more significant in litter addition than in biochar addition.Soil available phosphorus(AP)concentration was also significantly increased by different exogenous carbon additions,and the effect was more significant in the high addition rates than in the low addition rates.Biochar addition had no significant effect on soil dissolved organic carbon(DOC)concentration,but decreased soil dissolved nitrogen(DN)concentration,while litter addition significantly increased soil DOC and DN concentrations.The concentrations of soil microbial biomass carbon(MBC)and nitrogen(MBN)were not significantly affected by different exogenous carbon additions,but the activities of both sucrase and urease were decreased.Correlation analysis showed that soil pH,NH_(4)^(+)-N,NO_(3)^(-)-N,DOC and DN were the key factors affecting soil enzyme activities in Moso bamboo forest soil.
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