利用马尾松解析木对林地立地指数和立地形的研究  

Site Index and Site Form of the Forest Land by Stem Analysis of Masson Pine

作　　者：李清顺 王得军 孙景梅 刘勇 LI Qing-shun;WANG De-jun;SUN Jing-mei;LIU Yong(Northwest Surveying,Planning and Designing Institute of National Forestry and Grassland Administration, Xian 710048,Shaanxi,China;Key Laboratory National Forestry and Grassland Administration on Ecological Hydrology and Disaster Prevention in Arid Regions,Xian 710048,Shaanxi,China)

机构地区：[1]国家林业和草原局西北调查规划设计院,陕西西安710048 [2]旱区生态水文与灾害防治国家林业和草原局局重点实验室,陕西西安710048

出　　处：《西北林学院学报》2021年第4期159-166,共8页Journal of Northwest Forestry University

摘　　要：利用重庆市南川区马尾松解析木数据,选择合适的导向曲线方程,建立基于导向曲线的立地指数和立地形模型,并对立地形的适用性进行说明。根据散点图和三倍标准差对解析木数据进行了选择,排除了不符合要求的圆盘记录对。采用5种常用的经验生长方程对年龄-树高、胸径-树高进行拟合,根据决定系数R2,均方根误差RMES、AIC、方程的参数变动系数以及拟合曲线对方程进行选择;根据选定的方程,求出其连续生长量方程和平均生长量方程,并采用matlab绘制出其曲线方程,根据连续生长量和平均生长量次相交后的下一个龄(径)阶,选择出基准年龄(胸径);利用标准差调整法进行编表,编表后采用成对T检验方法对立地指数表和立地形表进行验证。结果表明,立地指数和立地形的表达精度在95%水平下显著,平均总相对误差和相对总误差都<5%,而预估精度分别达到了99.18%和99.22%,说明所编立地指数表和立地形表精度较高,能够满足编表需要。根据导向曲线绘制生长量曲线方程的方法确定基准年龄和基准胸径的方法准确可行;由于龄阶和径阶的选择差异,导致立地指数级不同,同时影响了立地形与立地指数的编表质量;由于树木的生长特性,立地形在表示立地质量时,在林木的早期将会低于立地指数,在树木生长的中后期将会高于立地指数;立地形的适用性取决于胸径与树高的相关性,相关性越强,立地形就越准确,在选择合适的优势木的情况下,立地形可以取代立地指数来表示林地质量。Based on the analytical data of Masson pine(Pinus massoniana)occurring in Nanchuan District of Chongqing,the appropriate guide curve equations were selected,then the site index and the site form models were established and the applicability of the site form was explained.Firstly,according to the scatter diagram and the triple standard deviation,the analytical wood data were screened,and the disk record pairs without meeting the requirements were deleted.Then,the age-height and DBH-height were calculated by using five kinds of empirical growth equations R2,RMES,AIC,the variation coefficients of the equations,and the fitting curves were used to choose the most appropriate equation.According to the selected equation,the continuous growth equation and average growth equation were obtained.And then,the curves were drawn by MATLAB and the reference age(DBH)could be selected according to the next age(diameter)order after the intersection of continuous growth curve and average growth curve.Finally,the data in table were collected by standard deviation adjustment method.The paired T-test method was used to verify the site index table and site form table.The accuracy of site index and site form were significant under 95%level,and the average total relative error and relative total error were less than 5%,while the prediction accuracy reached 99.18%and 99.22%respectively.These results showed that the site index table and topography table had high accuracy and could meet the needs of table compilation.1)The method of judging the base age and the base DBH is accurate and feasible based on the growth curve equation via drawing the guide curve.2)The site index class is different because of the selection difference between the age order and the diameter order,which affects the compilation quality of the site index table and the site form table.3)Based on the growth characteristics of trees,the value of site quality is lower than the site index in the early growth stage of trees when the site quality is described by site form.And

关 键 词：马尾松 解析木 立地质量 立地指数 立地形 

分 类 号：S758[农业科学—森林经理学]