摘要
利用“空间替代时间”的方法在赤水河中下游调查了86个样地,分别植被层和土壤层测定37和39个指标组成评价指标体系,研究了毛竹林立竹径级的龄级变化规律及影响因素。结果表明:1)不同龄级立竹间平均胸径的差异性显著,平均胸径随龄级降低呈波动式增加;平均胸径间相关性极显著,相关系数及贡献率随龄级降低而增加。2)不同龄级立竹的平均胸径与植被层、土壤层以及植被—土壤系统因子的多元线性回归模型相关性极显著,植被层及植被—土壤系统因子的相关系数随立竹龄级降低而增大、土壤层因子的相关系数趋势性则相反。3)Ⅱ~Ⅳ及Ⅰ~Ⅳ度竹林平均胸径与植被层、土壤层、以及植被—土壤系统因子的多元线性回归模型相关性极显著。除土壤A层及植被—土壤系统极少数因子外,Ⅱ~Ⅳ及Ⅰ~Ⅳ度竹林平均胸径的植被层、土壤层、以及植被—土壤系统因子贡献率的趋势性一致、数值大小不同。研究结果可为制定提高毛竹林径级的经营措施提供科学依据。
Using the method of space-for-time substitution,the study selects 86 sample plots in the middle and lower reaches of Chishui River in Guizhou Province and sets up an evaluation indicator system which is composed of 37 indicators relevant to the vegetation layer and 39 indicators pertaining to the soil layer,in order to study the variation regularity of standing bamboo s diameter at breast height(DBH)in different age classes of Phyllostachys pubescens forests and its contributory factors.The results show:1)The average DBH of standing bamboo in different age classes is significantly different,showing a fluctuating increment with the decrease of age class.There is a significant positive correlation between the average DBH values,and the correlation value and contribution rate increase with the decrease of age class;2)There is a significant correlation between the average DBH values of age class sequences and factors of vegetation layer,soil layer and vegetation-soil system in multiple linear regression models.The correlation coefficient values of the factors of vegetation layer and vegetation-soil layer increase as the age classes of standing bamboo decrease,while the relevant coefficient values of soil layer factors show the opposite trend;and 3)The correlation between the average DBH values of bamboo forest in the classes ofⅡ-ⅣandⅠ-Ⅳand factors of vegetation layer,soil layer and vegetation-soil layer in the multiple linear regression models are extremely significant.Except for a few factors relevant to soil layer A and vegetation-soil layer,the contribution rates of the factors in relation to vegetation layer,soil layer and vegetation-soil system to the average DBH values of bamboo forests inⅡ-ⅣandⅠ-Ⅳclasses indicate the same trends,but their values are different.The study provides a scientific basis for developing management measures to improve the DBH class of moso bamboo forests.
作者
张喜
周亚琦
苏文会
姜霞
黄仕平
Zhang Xi;Zhou Yaqi;Su Wenhui;Jiang Xia;Huang Shiping(Guizhou Academy of Forestry,Guiyang 550005,China;Guizhou Institute of Bamboo Industry for New Era,Chishui 564700,Guizhou,China;Guizhou Normal University,Guiyang 550001,China;International Center for Bamboo and Rattan,Beijing 100102,China;Chishui Forestry Bureau,Chishui 564700,Guizhou China)
出处
《世界竹藤通讯》
2023年第3期14-23,共10页
World Bamboo and Rattan
基金
贵州省林业局特色林业产业课题(特林研[2020]-01)
贵州省科技厅重大专项课题([2007]-6002030201)。
关键词
毛竹林
龄级
胸径
植被层
土壤层
赤水河中下游
moso bamboo forest
age class
diameter at breast height(DBH)
vegetation layer
soil layer
middle and lower reaches of Chishui river
