山西省林木资源价值核算

对山西省林木资源概况及主要类型的划分进行了详细叙述,提供了诸多林木价值的核算方法,根据山西省林木资源现状采用了市场价倒算法确定林木价格,并在此基础上对山西省林木资源价值进行了核算,计算出山西省林木资源的总价值。     

关于福建省树种结构调整问题的几点思考

根据福建省森林资源现状、结构特点提出关于树种结构调整必要性、树种结构调整必须考虑的几个问题 ,同时着重提出杉木、马尾松、阔叶树等几个主要树种的结构调整的方向、途径以及现有资源的合理利用等。     

Division of afforestation site type in the watershed of Wangjiagou, West Shanxi through GIS

Using quantification theory I, an analysis of the relation of soil water and qualitative factors, such as, slope degree, slope aspect, slope position, and soil in Wangjiagou watershed area has been done. The study aims to quantify the factors influencing soil water, the descending order of the factors being the slope aspect, soil, slope degree, and slope position, thereby scientifically facilitating division of afforestation site types and afforestation site products digitally on geographical information system (GIS). __________ Translated from Journal of Northwest Forestry University, 2006, 21(3): 184–188 [译自: 西北林学院学报, 2006, 21(3): 184–188]     

应用遥感数据识别意大利沿海松林灾害级别

分析了LandsatTM和ERS-1SAR数据用于识别意大利沿海松林污染灾害级别的潜在能力，结果显示出夏季获取的TM数据在森林灾害制图上远比冬季获取的TM数据和SAR影像有效，但SAR影像的贡献也是不可忽略的，文中给出了应用人工神经元网络B-P模型得到的对意大利沿海松林污染灾害级别划分的结果和应用FINDKAPP程序得到的精度评价结果。     

中国湿地分类系统的研究

在分析研究当前国际上一些主要湿地分类系统,总结国内湿地资源清查中有关湿地分类方法的基础上,结合我国实际情况和湿地资源清查数据管理的需要,提出了中国湿地分级式分类系统。该系统共为6级,第1级根据成因将全国湿地生态系统分为天然湿地和人工湿地两大类;第2级共分为9类,第3级共分为16类,第4级为基本级,共分为41类,其中天然湿地29类,人工湿地12类。对一些类型复杂的湿地,该系统还提出了第5级、第6级的分类。该系统将可尝试用于全国、流域、省区、地市等不同规模和层次湿地资源清查中的湿地分类。克服了一些分类方法中类型不全、彼此独立而导致资源调查和监测中数据不能有效利用的缺点,使任何一个规模和层次的资源数据可以和更高层次接轨,提高湿地资源数据的利用率。     

北京密云水库集水区森林景观生态分类研究

以遥感影像和地形图件为基础,结合二类调查资料和GPS实地布点,借助于ARC View和Fragstats软件,从不同尺度将集水区森林景观进行了分类归并,包括2个森林景观类、3个森林景观系、6个森林景观组、5个森林景观型和9个森林景观亚型。其中,生态型森林景观系是研究区域内的森林景观主体,森林景观多为幼龄林和疏林,针阔混交林的比重相对较低。各种森林景观类型景观斑块面积较破碎、形状较规则,受人类活动干扰普遍较为严重,宜以培育水源涵养与水土保持功能为主要目标,加强森林抚育,发展多种模式的混交造林。     

油橄榄不同品种果实经济性状的研究 Ⅱ.餐用品种果实

我国1964—1979年间引进的油橄榄餐用品种均已开花结果。经对其果实经济性状的测定表明,大部分品种保持了原有的特性,突出特点是果实大、果肉率高。典型的餐用品种有“戈达尔”、“贝拉”、“软阿斯”、“小平果”、“卡蒙·小平果”、“皮肖利”、“坦彩”以及我国选育的“中山_(24)”、“城固_(22)”。这些品种的果实单粒重量为4.58—9.02g;果肉率85.1—89.9％。果肉中含有多种有益于人体健康的营养成分:可溶性糖类占1.5—8.7％,粗蛋白3.8—11.9％(其中包括7种人体必需的氨基酸630—1280 mg/100g、6种非必需的氨基酸780—2450mg/100g);矿质元素1.7—2.2％(包括Ca、Mg、K、Na、P常量元素和Zn、Mn、Cu、Fe微量元素);以及7.9—15.8％的橄榄油。 研究初步确定了我国油橄榄餐用品种果实的分类标准;不同果实加工产品类型(青果型、黑果型)的适时采收期。     

甘肃森林生态旅游资源类型划分及开发初探

森林生态旅游资源类型的划分是开发森林生态旅游产品的基础。文章根据调查资料和教学体会,对甘肃森林生态旅游资源划分为沙漠绿洲、祁连冰雪、黄河风情、草原风光、伏羲文化、黄土风情等6种类型。提出了开发甘肃森林生态旅游必须树立的四个观念:整体旅游观念、特色旅游观念、PPT旅游观念和可持续发展旅游观念。     

地理信息系统支持下的森林分类区划界定

以武冈林场2003年森林资源调查资料为数据源,结合武冈林场的地形地势与区位特征,利用ArcInfo强大的空间分析与数据管理功能,按照森林的功能类型及森林区划技术标准,将武冈林场的森林资源划分为商品林和生态公益林2个类型,在此基础上,二级区划分为4个林种,三级区划分为9个林种;其次按公益林事权等级,划分了国家级公益林3 966.1 hm2、省级1 003.0 hm2、市级342.8 hm2.实现了森林分类区划界定的自动化、可视化及图形化;为森林分类经营提供了科学依据.     

Development of utility and location indices for classifying agroforestry species: the case of Rwanda

In a study of farmer knowledge and experimentation of trees and tree cultivation, two categories of farmer consultants were identified, tree experts (n = 44) and control farmers (n = 70), via a two stage process of knowledge ranking and community interviews conducted in three communes in southern Rwanda in 1992. A detailed inventory of tree species was conducted revealing two key characteristics for on-farm trees: multiple utility and high locational flexibility. In order to logically organize the species inventory, two indices, a utility index (UI) and a locational flexibility index (LFI), were developed. The two indices were calculated for each species and then plotted as the axes on a bivariate grid. While few species had both high utility and flexibility indices, the majority that did were indigenous species long used in agroforestry systems (e.g., Euphorbia tirucalli, Vernonia amygdalina, Erythrina abyssinica, etc.). A few naturalized exotics introduced in the 1930s (e.g., Grevillea robusta, Eucalyptus camaldulensis, E. saligna, E. maideni, Cupressus lusitanica and Persea gratissima) were also appreciated for their multiple utility and locational flexibility. Farm sizes varied, averaging 1.27 ha among tree experts and 0.18 ha in the control group. The mean number of species cultivated was significantly higher on tree expert farms (P < 0.01). However, tree density was much lower on tree expert farms (731 trees · ha^–1) than on control farms (1,689 trees · ha^–1). Competitive species were found primarily on larger farms, whereas smaller farms were associated with species of greater UI and LFI. Farmers demonstrated deliberate and rational choices about which trees to plant in accordance with each species utility and flexibility in relation to land availability.