基于ARCENGINE空间分析的林业区划界线自动提取方法

使用ARCENGINE的空间分析接口,编程实现林业区划界线的自动提取。与传统方法相比,该方法极大地提高了林业区划界线提取的效率和准确度,且自动化程度高,极易推广。     

内蒙古自治区森林资源状况

文章以内蒙古第六次森林资源连续清查结果为依据,概述了内蒙古自治区森林资源及其生态状况,并针对存在主要问题提出森林资源保护与发展建议。     

Investigations on the radioactive contamination of crop plants as a result of H-bomb detonation (Part 2) Root and foliage uptake of “Bikini ash”

The Foliar Uptake by Squash Plant

The radioactive ash for experimental use, hereafter referred to as “Bikini ash”, was prepared by igniting the heavily contaminated substances on board No. 5 Fukuryu Maru at about 650°C, followed by sifting through a 100 mesh sieve. On ignition some parts of the fission products, particularly iodine, ruthenium and tellurium would have possibly been lost to the air.     

现代电子称重技术发展对森林收获计测的影响

回顾森林收获计测技术的发展历史,分析现代电子称量技术的发展应用前景,指出木材及木制品以体积计量计价的局限性和以重量计量计价的优势,认为当前一些木材市场上出现的买卖双方以重量而不是以材积计量计价现象有其历史必然性。基于以重量计量计价更为客观、准确、快捷、高效,并大幅降低成本的优势,其在纸浆等工业原料林经营、林业碳汇贸易等方面具有广泛应用潜力。     

车筒竹地上生物量分配格局及秆形特征

为评价大型丛生竹种车筒竹Bambusa sinospinosa作为板材原料的适宜性，以毛竹Phyllostachys pubescens为参比竹种，研究了车筒竹地上生物量分配格局及秆形特征。结果表明：车筒竹地上各器官中，竹秆的生物量比例最大，占72.7%，其次为竹枝（15.9）和竹叶（11.4%）；秆形特征主要分析了胸径、秆高、秆质量、尖削度和竹壁厚等参数，其中，车筒竹全高（y/m）对胸径（x/cm）拟合的直线方程为y = 1.345 6x + 1.706 8（R² = 0.954 6，P = 0.000 0）。与毛竹相比，在胸径小于8 cm时，车筒竹全高比毛竹略小，而随着胸径的增大，全高逐渐大于毛竹；车筒竹秆鲜质量（y/kg）对胸径（x/cm）拟合的幂函数曲线为y = 0.138 2x^{2.481 2}（R² = 0.975 5，P = 0.002 2），大于相同胸径下的毛竹秆质量；从秆径和壁厚在竹秆纵向部位的变化看，车筒竹尖削度小于毛竹，而壁厚变化则相对较快。综合分析来看，车筒竹作为竹板材原料竹种具有较大的开发前景。图5表3参21     

辽宁省集体林权纠纷调处问题及对策

介绍了辽宁省集体林权纠纷调处主要做法,指出了目前林权纠纷调处过程中存在的问题,并对这些问题提出了一些对策。     

陕西太白山自然保护区森林病虫害初步调查

本文记述了太白山自然保护区内的主要森林病虫害种类,并初步提出了科学合理的保护区森林病虫害防控措施。     

彩色茧（金黄色）新品种金秋×初日永康试养初报

家蚕新品种金秋×初日除具有天然金黄色蚕茧性状外，其它各项经济性状与对照种秋丰×白玉相仿。但在气候比较恶劣的环境下，金秋×初日明显的表现出强健性高，发病率低，是一对能适合适度规模化省力化饲养，特别是在饲养条件比较差的环境下取得稳产的优良品种。     

Recreational preferences depending on thinning practice in young even-aged stands of pedunculate oak (Quercus robur L.): comparing the opinions of forest and landscape experts and the general population of Denmark

The aim of this study was to investigate to which extent forestry professionals, other “green” professionals (mainly landscape architects) and natural resource students in Denmark agree with the general population regarding their recreational preferences for contrasting stem densities in young, even-aged stands of pedunculate oak (Quercus robur L.). The study was based on five pairs of colour photographs from each of the five recently thinned experimental plots in a 13-year-old stand. The plots represented five different residual stem densities: 7000 (unthinned), 5300 (traditional thinning), 1000, 300 and 100 stems ha^?1. All cut trees were left on the ground. The analysis was carried out as a survey of forest and landscape experts (n=158) and the general public (n=243) based on questionnaires. Interviewees ranked the photographs according to the criterion: “Which forest environment do you prefer as a visitor?” Principal component factor analysis showed that the general public tended to perceptually group photos according to similar overall pattern of openness, presence of row structure and stand accessibility (including presence/absence of slash). As long as a stand appeared accessible, stand density had little influence on their preferences for a wide range of stand densities (5300?300 stems ha^?1). In contrast, foresters, other “green” professionals and students seemed to perceptually group photos according to treatment type, and the presence of slash had little influence on their preferences. This suggests an influence of professional background, making experts visually analyse and evaluate stands according to contemporary management standards and paradigms within their own profession.     

不同采伐强度对闽西常绿阔叶林林分结构稳定性的影响

应用多样性分析方法和改进后的 M.Godron 稳定性测定方法研究常绿阔叶林5种不同强度采伐(弱度9.8%、中度24.5%,强度46.8%和极强度72.3%和皆伐)作业10 a后林分结构稳定性.结果表明,择伐林地林分处于稳定状态,随着择伐强度的增强,林分的稳定性开始逐渐降低.皆伐林地林分处于不稳定状态.对于常绿阔叶林的科学经营,从稳定性出发,应尽量采取择伐方式,尤其是中低强度的择伐方式.