Using landscape preference models and tree-scale measurements to predict stand quality

Scenic beauty estimation (SBE) models that quantify landscape aesthetics through picture-based questionnaires are complicated to develop. Therefore, precise, simple, and widely applicable models of SBE prediction based on tree and stand measurements must be developed. To investigate the application of tree- and stand-based SBE models to Chinese fir forest management, the relationships between diameter at breast height (DBH) and tree height (H) measurements and tree- (T_SBE) and stand (S_SBE)-based SBE predictions were assessed. T_SBE and S_SBE were strongly influenced by DBH and H measurements according to either a power function or linear function, depending on the variables. When the mean stand DBH was less than 8.4?cm or H was less than 9.8 m, dense canopies resulted in negative S_SBE residuals. In stands with large trees and non-dense canopies, the residuals of S_SBE were positive. We conclude that average H and DBH measurements within a stand can be used to predict S_SBE by extrapolating the tree-based SBE model to form a stand-based SBE model. Therefore, SBE models based on individual tree measurements can provide quantitative guidance for forest landscape quality planning and evaluation.     

交通流影响因子与道路交通噪声的关系研究

引进等效流量与等效车速的概念,对美国FHWA道路交通噪声模型进行修正,建立适合我国的交通流影响因子与道路交通噪声的线性对数关系模型。再选取哈尔滨市18条道路的42个监测点采样数据,运用软件SPSS13.0,通过回归分析的方法确定模型的参数,并对建立的模型进行F检验及拟合度分析。模型通过F检验,且拟合度较高。最后对哈尔滨市8个监测点噪声的预测值与实测值做对比分析,预测值与实测值差值较小,此建立的模型可应用在哈尔滨市道路交通噪声的预测。     

Gamma generalized linear model to investigate the effects of climate variables on the area burned by forest fire in northeast China

The purpose of this study was to determine a suitable model for investigating the effects of climate factors on the area burned by forest fire in the Tahe forest region, Daxing’an Mountains, in northea...     

气温和降水对银杏超小卷叶蛾发生的影响及预测模型构建

基于江苏省泰州市2007—2020年气候资料和银杏超小卷叶蛾Pammene ginkgoicola Liu发生数据,运用Pearson相关性分析和线性回归分析法,分析气温和降水因子对银杏超小卷叶蛾发生影响,建立虫害发生率的回归预测模型.结果表明:银杏超小卷叶蛾发生率与羽化和孵化期平均降水量呈极显著正相关关系(P<0.0...