阔叶混交措施对桂南桉树人工林土壤碳氮储量的影响  

Effects of Broad-leaved Tree Mixtures Involving Plantation Eucalyptus on Soil Carbon and Nitrogen Storage in Southern Guangxi

作　　者：蒋林 梁燕芳 朱原立 陆星任 赵隽宇 唐健[2] JIANG Lin;LIANG Yanfang;ZHU Yuanli;LU Xingren;ZHAO Junyu;TANG Jian(Guangxi State-owned Qipo Forest Farm,Nanning 530225,Guangxi,China;Guangxi Forestry Research Institute,Guangxi Research and Development Center for New Forestry Fertilizer,Nanning 530002,Guangxi,China;Guangxi Huawote Ecological Fertilizer Co.,Ltd.,Nanning 530025,Guangxi,China)

机构地区：[1]广西国有七坡林场,广西南宁530225 [2]广西林业科学研究院/广西林用新型肥料研发中心,广西南宁530002 [3]广西华沃特生态肥业股份有限公司,广西南宁530025

出　　处：《桉树科技》2022年第3期9-13,共5页Eucalypt Science & Technology

基　　金：广西林业科技推广示范项目《生态缓冲区桉树人工林土壤生态功能提升技术研究与示范》(桂林科研〔2021〕23号);《高代次桉树人工林生产力和地力对林下植被抚育的响应》(桂林科研〔2021〕6号)。

摘　　要：米老排作为伴生树种营建桉树-米老排混交林是一种既能保证生产效益,又能兼顾生态效益的经营方式,但何种伴生比例对于提升林分土壤碳、氮储量尚不清楚。本研究以桂南15%、25%伴生比例的桉树-米老排混交林土壤为研究对象,测定土壤有机碳、全氮含量,通过有机碳、氮储量公式计算不同林分结构土壤有机碳、氮储量。结果表明:营建桉树-米老排混交林对于土壤有机碳含量、碳氮比的提升影响显著,对土壤有机碳储量亦有正向的影响,但对土壤氮储量的影响不显著。25%的混交比例对于土壤碳氮比、有机碳储量的提升更为明显。在今后的生产经营策略中,应适当引入混交林的经营措施,并提高混交比例,实现广西人工林经营及林业下游产业的生态友好可持续发展。It is a kind of management method to construct Eucalyptus-Mytilarialaosensis mixed forest in order to both guarantee production efficiencies and take into account ecological efficiencies.However,it is not clear what mixture ratios of these tree species can improve soil carbon and nitrogen storage.In this study,the soil organic carbon and total nitrogen contents were measured in plantations of Eucalyptus planted with 15%and 25%mixture of M.laosensis in southern Guangxi.The results showed that the Eucalyptus-M.laosensis mixed plantations significantly improved both soil organic carbon content and C/N ratio and had a positive effect on soil organic carbon storage but had no significant effect on soil nitrogen storage.The mixture ratio of 25%M.laosensis provided better improvement of both soil C/N ratio and soil organic carbon storage.In future plantation production and management strategies,it is suggested that establishment of mixed species plantations should be appropriately adopted.The proportion of alternative species in these mixed Eucalyptus plantations should be increased so as to realize ecological friendly and sustainable development of plantation forest management in support of the downstream forestry industry in Guangxi.

关 键 词：混交比例 伴生树种 米老排 土壤碳库 人工林碳储量 

分 类 号：S718.5[农业科学—林学]