石漠化地区生态经济树种马桑的萌条生长特性研究  

Sprout Growth Characteristics of Eco-economic Tree Species Coriaria nepalensis in Rocky Desertification Area

作　　者：肖玖军 陈阳[2,3] 邢丹 李可相[2,3] 张蓝月 谢刚 XIAO Jiujun;CHEN Yang;XING Dan;LI Kexiang;ZHANG Lanyue;XIE Gang(College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,Guizhou,China;Institute of Mountain Resources,Guizhou Academy of Sciences,Guiyang 550001,Guizhou,China;Engineering Research Center for Land Green Consolidation of Guizhou,Guiyang 550001,Guizhou,China;Institute of Sericulture,Guizhou Academy of Agricultural Sciences,Guiyang 550009,Guizhou,China)

机构地区：[1]贵州大学资源与环境工程学院,贵州贵阳550025 [2]贵州科学院山地资源研究所,贵州贵阳550001 [3]贵州省土地绿色整治工程研究中心,贵州贵阳550001 [4]贵州省农业科学院蚕业研究所,贵州贵阳550009

出　　处：《西北林学院学报》2024年第5期159-167,共9页Journal of Northwest Forestry University

基　　金：国家自然科学基金(32060377);贵州省林业科研课题[黔林科合(2017)08号];贵州省科技支撑计划项目[黔科合支撑(2023)一般048号];贵州省基础研究计划项目[黔科合基础-ZK(2022)一般276号]。

摘　　要：为探究西南喀斯特石漠化地区生态经济树种马桑萌条生长特性和内部竞争作用,促进石漠化治理和生态重建,在西南喀斯特轻度石漠化环境下开展马桑扦插苗造林试验,自然生长2 a后对马桑幼林进行典型木调查,结果表明:1)单木水平上,幼木径向结构和垂直结构均符合同龄林特征的正态分布;萌条水平上,萌条径向结构和垂直结构均符合异龄林特征的不规则山状分布;2个水平上,径向生长与垂直生长间均存在极显著相关,且具有较高精度的线性关系;2)2年生萌条数量是1年生萌条数量的1.6倍,萌条角度比1年生萌条小10.3°,年龄对萌条生长特征存在极显著性效应;3)萌条健康状况与萌条特征有极显著关系,健康萌条表现出萌条角度大、基径粗、萌条高和次级分枝数多等特征,顶枯或死亡萌条的生长特征则相反;4)萌条间密度效应较为明显,2年生萌条多、细、矮,萌条形态呈平展型,而1年生萌条少、粗、高,萌条形态呈紧凑型。研究表明,在轻度石漠化背景下,随着生长年限增加,马桑植株和萌条生长呈较大分异,采用先r后k的生长策略,应根据马桑生长特性,采用人工稀疏、伐条等措施加强定向培育,提升马桑生态经济性能。To examine the growth dynamics and inter-sprout competitive interactions of Coriaria nepalensis in the karstic regions affected by rocky desertification in Southwestern China,and to advance the efforts in combating desertification and promoting ecological restoration,an intricate afforestation trial using C.nepalensis cuttings was conducted in a karst landscape experiencing mild desertification.This initiative led to a subsequent evaluation of selected C.nepalensis sprouds following a natural growth period of two years.The results indicated that 1)at the individual tree level,both the radial and vertical growth patterns of young trees closely resembled the normal distribution observed in homogeneously aged forests.In contrast,the growth arrangement at the sprout level was significantly akin to an irregular,montane distribution pattern,a typical pattern of uneven aged forests.A noteworthy linear correlation was established between radial and vertical growth across these dimensions,indicating a consistent growth pattern.2)There was a significant 1.6-fold increase in the number of two-year-old sprouts compared to their one-year-old counterparts,along with a notable 10.3°reduction in the angular orientation of the older sprouts.This highlighted the significant influence of age on the growth characteristics of sprouts.3)A pronounced relationship was identified between the health of the sprouts and their observable traits.Healthy sprouts were characterized by a broader angular distribution,a thicker base diameter,greater height,and a larger number of secondary branches,contrasting sharply with the features of withered or deceased sprouts.4)The study also illuminated the pronounced effects of intra-sprout density within C.nepalensis populations.Two-year-old sprouts were more numerous but exhibited a thinner and shorter stature with a flattened shape,unlike the one-year-old sprouts,which were fewer but thicker,taller,and demonstrated a more compact form.In summary,the findings underscore a significant diversification in

关 键 词：马桑 萌条 生长 生态经济 石漠化 

分 类 号：S758.5[农业科学—森林经理学]