闽中毛竹立地质量评价及分级研究  

Study on site quality evaluation and classification of Phyllostachys edulis in central Fujian

作　　者：罗天磊 范少辉 刘广路 申景昕 吴昌明 LUO Tianlei;FAN Shaohui;LIU Guanglu;SHEN Jingxin;WU Changming(International Center for Bamboo and Rattan,Beijing 100102,China)

机构地区：[1]国际竹藤中心,北京100102

出　　处：《中南林业科技大学学报》2020年第7期48-57,共10页Journal of Central South University of Forestry & Technology

基　　金：“十三五”重点研发课题(2018YFD0600103)。

摘　　要：【目的】毛竹立地质量评价是揭示毛竹生长与其立地因子间的关系的重要方法,对其进行研究是科学培育毛竹林的基础。【方法】对福建省永安市毛竹林的胸径、竹高进行了大样本调查分析,采用引入哑变量分级的方法,建立了毛竹的竹高-胸径曲线模型;探讨了毛竹胸径与其立地的气候因子、地形地貌因子及土壤因子间的关系,构建了回归模型。【结果】1、拟合毛竹竹高-胸径曲线的最优模型为逻辑斯蒂模型,引入哑变量分级的方法可以显著提高模型精度。引入哑变量分级的方法与未分级的方法相比,分级后模型的决定系数由0.548提高到0.901。依据模型实验区毛竹林可以分为5个立地等级。2、主成分分析表明,实验区影响毛竹生长的最重要气候因子为1月均温和出笋期降水量。3、对福建省毛竹胸径起影响的地形地貌因子重要性排序为:土层厚度>坡位。可以用线性模型拟合胸径-地形地貌因子线性模型:D=0.119×(Pos)+0.803×(Thc)+8.136(R2=0.554)。4、在土壤因子中,重要性排序为:全氮>有机质>碱解氮。【结论】采用引入哑变量分级的方法可显著提高毛竹立地质量评价的精度,1月均温、出笋期降水、土层厚度、坡位、坡度、全氮、有机质、碱解氮是与毛竹生长相关的主要气候和立地因子。研究结果为毛竹立地质量评价及生产潜力预估模型的构建提供了新的方法。【Objective】Site quality evaluation of Phyllostachys edulis is an important method to reveal the relationship between the growth of bamboo and its site factors,and is the basis for scientific cultivation of moso bamboo forests.【Method】The DBH and height of moso bamboo forests in Yongan city,Fujian province were investigated and analyzed with large samples,and the height-DBH curve model of moso bamboo was established by introducing dumb variable grading method.The relationship between DBH and climatic,topographic and soil factors of its site was discussed,and the regression model was constructed.【Result】1、Logistic model is the best model to fit the height-DBH curve of moso bamboo.The introduction of dummy variable classification method can significantly improve the accuracy of the model.Compared with the Non-grading method,the decision coefficient of the graded model is increased from 0.548 to 0.901.According to the model experimental area,the bamboo forest can be divided into five site grades.2、Principal component analysis showed that the most important climatic factors affecting the growth in the experimental area were average temperature in January and precipitation during shooting period.3、The order of importance of topographic and geomorphological factors affecting the DBH is:soil thickness>slope position.Linear model of DBH-topographic and topographic factors can be fitted:D=0.119×(Pos)+0.803×(Thc)+8.136(R2=0.554).4、Among the soil factors,the order of importance is total nitrogen>organic matter>alkali-hydrolyzed nitrogen.【Conclusion】The introduction of dumb variable classification method can significantly improve the accuracy of site quality evaluation of moso bamboo.Among site factors,average temperature in January,precipitation at shooting stage,soil thickness,slope position,slope gradient,total nitrogen,organic matter and alkali-hydrolyzed nitrogen are the main climate and site factors related.The study provides a new method for site quality evaluation and production potential pre

关 键 词：毛竹 竹高-胸径模型 哑变量 立地因子 

分 类 号：S714.8[农业科学—林学] S795