广西桉树碳氮磷分配格局及其生态化学计量特征

对广西幼龄林(1 a)、中龄林(2 a)、近熟林(3 a)、成熟林(5 a)、过熟林(8 a)桉树人工林的叶、枝、干、根的C、N、P含量及其生态化学计量特征的分配格局进行研究,幵探讨两者随林龄的变化及其相互间的兲系。结果表明:桉树各器官有机碳含量差异不显著,有机碳含量随林龄变化不显著;叶片中N、P元素含量相对较高,各器官N/P随着林龄的增加先减小后增大;较于其他器官,桉树叶表现出较高的C/P和较低的C/N、N/P;中龄林、近熟林、成熟林桉树叶片N/P均小于14,表明桉树在中龄林、近熟林和成熟林生长过程受到N的限制。     

不同类型林分青杨虎天牛发生状况研究

通过调查分析,得到青杨虎天牛在各种杨树及其它阔叶树种的纯林、混交林以及不同类型林分、、树干不同部位的发生状况,选择出相对抗青杨虎天牛及易受青杨虎天牛危害的杨树品种及其它阔叶树种,为利用生态方法控制青杨虎天牛的传播和蔓延提供了科学依据。     

有机磷农药混合标准溶液配制不确定度评价（英文）

标准溶液的不确定度对农药残留检测起着非常重要的作用,影响着检测结果的准确性。笔者以实际应用的14种有机磷农药混合标准溶液为例,采用配制混合标准溶液过程单元操作的不确定度计算方法(top down),分析了在配制混合标准溶液过程中的所有影响因素,得到了最终的扩展不确定度。最终结果显示使用精准的移液器将储备液配置为混合标液,得到最终的扩展不确定度相对小。     

尤溪县生态公益林林分改造的分析与对策

对尤溪县境内的闽江支流尤溪河两岸、道路两边及库区周边一重山的生态公益林现状及存在问题进行了分析，提出了对公益林部分林分进行改造的初步规划，探讨了公益林改造的对策，为尤溪县“两沿一环”（即沿高速公路、公路、铁路，沿河，环城区周边一重山）林分改造工程提供参考。     

拖拉机传动系加载磨合台测控技术研究

介绍拖拉机传动系加载磨合台的系统构成、软件设计、功能与创新之处。本磨合台采用电封闭结构,驱动电动机驱动被试传动系,被试传动系带动加载电动机,加载电动机产生的电能又返回驱动电动机,实现能量的循环利用。软件设计保证用户操作简单、稳定可靠。     

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.     

香菇芦笋复合饮料的研制

利用香菇和芦笋的下脚料加工配制的复合饮料具有香菇和芦笋和芦笋特有的香味,口感纯正,效果很好。     

鳞毛蕨(Dryopteris filix-mas)天山云杉林种群结构分析

以西天山国家自然保护区内1 hm2原始鳞毛蕨(Dryopteris filix-mas)天山云杉纯林临时标准地调查材料为基础,分析鳞毛蕨天山云杉林胸径、树高和年龄结构、种群存活曲线以及基本测树因子之间的相互关系.结果表明:①鳞毛蕨天山云杉纯林种群结构稳定,无论是胸径、树高抑或年龄,均呈现出明显的倒"J"型,属于典型的异龄林林分结构,林木更新良好,在其自维持过程中不断有大量小径木更新补充;②林木株数随胸径、树高和年龄的增大,呈负指数函数或负幂函数递减;③树木胸径和树高随年龄的增大,按理查兹生长曲线递增;④胸径与树高的关系为非线性关系.此外,种群存活曲线总体趋势呈现"凹"型,表明该种群是一个连续更新的种群,在林分生长发育过程主要受到小尺度林冠干扰的影响.