兴安落叶松树干去皮直径预测模型

利用兴安落叶松解析木数据,比较了树干去皮直径预测的3种类型模型:Grosenbaugh的比率方程式、回归模型和削度方程。Grosenbaugh的比率方程式有很大的灵活性,没有参数不需要模型拟合。总体评价和模型分段比较表明,回归模型有较小的预测误差,尤其是Cao and Pepper提出的含有带皮直径、树高、相对树高、胸径处的带皮直径和去皮直径变量的模型。由于削度模型不含有带皮直径变量,因此产生较大的去皮直径预测误差。不同类型的模型在森林经营过程中都有一定的适应性。     

Cutting technic forPinus elliottii plantation of the multi-benefit management pattern

The cutting technic for thePinus elliottii plantation of the multi-benefit management pattern in the hilly region of Jiangxi Province was studied by establishing the model of growth progress according to Richards function and simulating the tending cutting on computer by use of dynamic programming. The results showed that the best time for the initial thinning was at tree age of 8–10 and final cutting was at tree age of 25. The optimal thinning project was 3 times of thinning cutting including the first thinning, and the thinning time was at tree ages of 8, 12 and 16, respectively. Their thinning intensities were separately 950, 700 and 300 trunks per hectare, and the preserved density was 550 trunks per hectare until the final cutting Foundation item: This study was supported by Natural Science Foundation of Jiangxi Province (A grant 0330023) Biography: WANG Qing-chun (1970-), male, Ph. Doctor, Senior Engineer in Academy of Forest Inventory & Planning, Jiangxi, Nanchang 330046, P.R. China. Responsible editor: Song Funan     

高等级公路建设测量监理工程师的素质与职责

本文叙述了高等级公路建设过程中测量监理工程师的职责、作用、应具备的素质，说明了测量监理的工作流程，具有参考价值。     

Power spectrum density and experimental modal analysis of wide belt sander applied in domestic wood industry

This paper took the upper-lower wide belt sander B229 with four-feet wide belts, manufactured in China, as the study target. By means of framework dynamic design, we study its vibration characteristics by commencing from the place having horizontal defects and used experimental modal analysis (EMA) and power spectrum density (PSD) to observe the sanding parts and the whole machine, respectively. In the modal test, we mainly adopted the cross spots testing method to get the frequency response function of the fixed spots to every excitation vibration spot, then applied the SISO frequency response function and the frequency response function fitting method to identify and complete parameter recognition, respectively. The typical frequency response function chart of the whole machine and its sanding parts, as well as its second-order mode charts of contacting roller, were obtained. Through PSD analysis, we can get the amplitude-frequency spectrum and drive frequency. Translated from Scientia Silvae Sinicae, 2005, 41(6): 132–137 [译自: 林业科学]     

常绿阔叶林的可持续经营

通过对常绿阔叶林研究，努力探索一条发展常绿阔叶林的途径。将阔叶林划分为3个经营类型，分别为：初期幼龄林组成抚育类型、中期幼龄林抚育间伐类型、中龄林密度管理类型。并提出小面积皆伐的采伐方式。同时对常绿阔叶林的生态功能和生产力进行初步研究。     

植物热激蛋白的诱导合成

热激蛋白是一类在有机体受到逆境(如高温等)刺激后大量表达的蛋白。主要参与生物体内新生肽的运输、折叠、组装、定位以及变性蛋白的复性和降解。该文综述了植物热激蛋白的种类、诱导合成方法、机理和基因表达及经典检测和分离手段。     

Function and value of water conservation in different age classes of Acacia mangium plantations

For this paper, we studied the water-holding capacity of canopy, vegetation layer under canopy and litter layer, the water-holding capacity and permeability of soil as well as their changes with growth of stands in Acacia mangium plantations of three different age classes (four-, seven-and 11-year-old). Results show that total water-holding above ground in the order of 11-year stand age (52.86 t/hm²)>seven-year stand age (41.90 t/hm²)>seven-year stand age (25.78 t/hm²), the increment tendency increased with stand age. Similar sequence also obtained on the water-holding capacity and permeation capacity of soil (0–40 cm). The total water-storage capacity both above ground and soil in four-year-old, seven-year-old and 11-year-old of A. mangium plantations were 2,023.0, 2,158.4 and 2,260.4 t/hm², respectively, and the all value of water conservation were 1,372.70, 1,474.42 and 1,549.91 yuan (RMB)/hm², respectively. Therefore, A. mangium plantation had a good ability to modify soil structure and good water conservation function. __________ Translated from Journal of Soil and Water Conservation, 2006, 20(5): 5–8, 27 [译自: 水土保持学报]     

大围山自然保护区森林生物多样性生态服务功能评价

根据收集到的资料,参考国内外关于生物多样性生态服务功能的相关理论知识及其价值的评价方法,综合运用直接经济价值评估法、影子工程法、费用替代法、机会成本法、碳税法等价值评价的方法,对大围山自然保护区生物多样性生态服务功能进行了经济价值计算和评价。     

面向控制系统的系统逻辑分析和设计方法

本文应用离散事件系统（ＤＥＤＳ）对系统进行分析，求出了状态转移函数，找出了状态转移规律的给定模式，并根据结定模式的逻辑关系，匹配出梯形图程序．为实现系统分析和系统程序设计的规范化提供了依据．     

南洞庭湖湿地生态系统结构、功能与可持续研究

洞庭湖是我国著名的淡水湖泊湿地，也是世界上唯一的由3个国际重要湿地组成的湖泊。文章分析了南洞庭湖湿地的形成原因及演替规律，研究了其生态系统结构特征，评价了动物栖息地、植物基因库、生态改善、湿地生产、科教基地、旅游度假等湿地功能，指出其面临的主要问题是湖泊面积缩小、湿地功能衰退、动物种群衰减、资源利用率低、环境污染加剧，提出扩大湖泊面积、重视湿地资源保护、加强自然保护区建设、发展湿地生态农业、加快湿地污染治理的南洞庭湖湿地生态系统可持续发展途径。