抚育措施对桉树人工林林下植被多样性和养分现存量的影响  

Effects of Tending Measures on Understory Vegetation Diversity and Nutrient Storage of Eucalypt Plantations

作　　者：梁小梅 李媚 农慧 张秀华 黄艳芳 徐惠飞 卢澳邹 宋贤冲[4] 覃其云[4] 王会利[4] LIANG Xiaomei;LI Mei;NONG Hui;ZHANG Xiuhua;HUANG Yanfang;XU Huifei;LU Aozou;SONG Xianchong;QIN Qiyun;WANG Huili(Guangxi State-owned Qipo Forest Farm,Nanning 530225,Guangxi,China;Guangxi Nanning Liangfengjiang National Forest Park,Nanning 530031,Guangxi,China;Nanjing Forestry University,Nanjing 210037,Jiangsu,China;Guangxi Forestry Research Institute/Key Laboratory of National Forestry and Grassland Administration on Cultivation of Fast-growing Timber in Central South China/Guangxi Research and Development Center for New Forestry Fertilizer,Guangxi Forestry Research Institute,Nanning 530002,Guangxi,China)

机构地区：[1]广西国有七坡林场,广西南宁530225 [2]广西南宁良凤江国家森林公园,广西南宁530031 [3]南京林业大学,江苏南京210037 [4]广西林业科学研究院/中南速生材繁育国家林业和草原局重点实验室/广西林用新型肥料研发中心,广西南宁530002

出　　处：《桉树科技》2023年第2期66-72,共7页Eucalypt Science & Technology

基　　金：广西林业科技推广示范项目《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);广西自然科学基金项目《桉树人工林不同林下植被构建模式下土壤有机碳固持的调控机制》(2022GXNSFBA035578);技术开发(委托)项目/广西自筹经费林业科技项目《不同除草方式下桉树萌芽林生长和土壤功能的监测与评价》(桂林科研[2022ZC]第78号)。

摘　　要：通过调查除草剂(T1)、人工带状去除(T2)和人工全去除(T3)三种措施下桉树人工林林下植被多样性、生物量和养分含量等指标,探讨林下植被多样性和养分现存量对抚育措施的响应,为桉树人工林林下植被的科学管理提供技术指导。结果表明:桉树人工林林下植被Margalef丰富度指数(M)、Simpson优势度指数(D)、Shannon-Wiener多样性指数(H)和Pielou均匀度指数(Jsw)的变化范围分别为1.67~4.67、0.46~0.53、0.69~1.03和0.77~0.94;T2的M、D、H指数最高;林下植被生物量的变化范围为241.74~1046.02 kg·hm^(-2),以T2最大;不同抚育措施对林下植被N、Ca、Zn、Fe、Mn产生显著影响,而对其他元素无显著影响;林下植被养分现存量的变化范围为79.2~509.80 kg·hm^(-2),其变化规律与生物量相似,以T2最大;林下植被养分现存量仅与生物量呈显著正相关(0.740),林下植被生物量与多样性指数H呈显著相关(0.564),林下植被多样性主要通过影响生物量间接影响林下植被养分现存量。结合研究结果,维持桉树人工林林下植被多样性的措施以人工带状抚育为佳。In this study,the diversity,biomass and nutrient contents of understory vegetation in eucalypt plantations under three treatments comprising herbicide(T1),artificial strip removal(T2)and artificial total removal(T3)were investigated.Following treatment,the response of understory vegetation diversity and nutrient storage to each treatment was evaluated to provide technical guidance for the scientific management of understory vegetation in eucalypt plantations.The results showed that the range of variation in Margalef index(M),Simpson index(D),Shannon-Wiener index(H)and Pielou in-dex(Jsw)were 1.67~4.67,0.46~0.53,0.69~1.03 and 0.77~0.94 respectively.The M,D and H indices values of treatment T2 were the highest.The biomass of the understory vegetation ranged from 241.74 to 1046.02 kg·hm^(-2),and the maximum value was obtained in treatment T2.Different tending measures had a significant effect on N,Ca,Zn,Fe and Mn contents of the understory vegetation,but had no significant effect on other elements.The variation range of nutrient storage of understory vegetation was 79.2 to 509.8 kg·hm^(-2),which was similar to that of the understory biomass,and treatment T2 had the largest nutrient storage.The nutrient storage of understory vegetation was significantly positively correlated with only biomass(0.740),and the biomass of understory vegetation was significantly correlated with H index(0.564).It was concluded that the diversity of understory vegetation mainly affected the nutrient storage of understory vegetation indirectly through its affects on biomass,and that artificial strip tending is the best approach to maintain the diversity of understory vegetation in eucalypt plantations.

关 键 词：桉树 林下植被 抚育 多样性 养分现存量 

分 类 号：S714.2[农业科学—林学]