高等农业院校本科教材评价体系的构建

教材评价是选用教材反馈信息的主要渠道,它是做好教材建设的关键环节之一。针对高等农业教育教材建设和评价体系现状,构建了一个适用于兼顾高等农林院校的传统纸质教材和数字化教材的评价体系,为教学过程中选用适用的教材提供了一个参考标准。     

福建龙眼树冻害指标初探

强低温常给龙眼树造成伤害,重则死亡,探讨龙眼树的冻害指标对龙眼树的合理布局和低温预警具有重要意义。为此,本文收集福建省近几年冬季低温考察资料、龙眼树冻害调查资料,引用考察文献中的龙眼树冻害和同期的低温资料,参考广西壮族自治区气象减灾研究所1999／2000年冬季10多县（市）龙眼树冻害的照片资料和对应的低温资料;经统计处理整理成同时同地龙眼树的冻害级别与百叶箱中的最低气温资料;相关分析表明：龙眼树冻害级别与最低气温间可以用一元二次方程拟合,龙眼树的无冻害、轻冻害、中冻害、重冻害、严重冻害对应的最低气温分别为-0．2℃、-1．6℃、-2．6℃、-3．3℃、-3．5℃;各冻害级别之间平均温差随着冻害级别的提高而缩小。     

Trillium grandiflorum height is an indicator of white-tailed deer density at local and regional scales

High densities of white-tailed deer (Odocoileus virginianus) in the U.S.A. and Canada are reducing or preventing forest regeneration, and as a result, deer function as a keystone species in some sites. Management decisions about deer require reliable population density data, which are challenging to obtain at both regional and local scales. We tested the broad-scale applicability of the indicator species approach in which forage plant height was used to estimate deer density. The maximum heights of marked and unmarked plants of the widely distributed, spring-flowering polycarpic herb, white trillium (Trillium grandiflorum) were measured across southern Ontario, Canada, over a 15-year period. A significant negative relationship was found at 10 sites between maximum plant height and estimates of deer population densities, which were derived from counts of live or culled animals and varied from 7 to 40 deers km⁻². Maximum plant height could be reliably measured within a 4-week period. The underlying mechanism driving the negative relationship between plant height and deer density was attributed to deer preferentially selecting taller plants that grew less than ungrazed plants in the subsequent year. In 16 additional sites with locally high deer populations, the mean maximum height of T. grandiflorum appeared to be a more reliable indicator of deer density than estimates based on hunter returns across the broader regional scale of the Wildlife Management Unit. The ability to assess local scale white-tailed deer densities based on measuring heights of an easily identifiable, widespread plant, provides local residents and landowners with a tool for estimating the potential impacts of deer browsing and grazing in local woodlots and forests, improving local knowledge about herbivory pressure.     

我国EIA有效性分析与指标优化研究

分析了我国环境影响评价（EIA）有效性现状及评价全过程,对现有EIA有效性评价的指标体系进行了优化,并提出将环境健康指标纳入指标体系的建议,籍以更好地提高我国环境影响评价有效性。     

Site requirements of the endangered rosewood Dalbergiaoliveri in a tropical deciduous forest in northern Thailand

Planting native trees may complement and accelerate natural regeneration and support recovery of biodiversity in degraded forests. Before planting trees, however, there is a need for species-specific site selection criteria. This study investigates the site requirements of a valuable but endangered rosewood species, Dalbergia oliveri, with the purpose of restoring degraded deciduous forest in northern Thailand.     

河北省城镇化发展水平评价及对策研究

在分析城镇化实质内容的基础上,构建融人口、经济、社会文化、基础设施于一体的城镇化发展水平综合评价指标体系。采用熵值法,对河北省城镇化整体发展水平进行了综合评估。从降低农民进城成本、优化城市投资环境、发展集群经济、推进京津冀的一体化战略等方面提出了加快城镇化发展的对策。     

土壤养分状况系统研究法在蕉园土壤上的应用研究

采用实验室分析、吸附试验和温网室盆栽试验相结合的诊断程序,以香蕉为指示作物,对广州市番禺区3种蕉园土壤的养分限制因子进行了系统诊断.结果表明:广州市番禺区3种蕉园土壤均缺N,减N处理产量分别比最佳处理(OPT)下降59.7%、46.7%和55.1%,减产极显著.番禺东涌蕉园与灵山蕉园土壤K、Mg含量偏低,B丰富;万顷沙蕉园土壤P、K含量较缺乏;3种土壤中的Ca与Fe含量充足,Mn含量较充足.     

可持续发展战略下的重庆市生态竞争力研究

以可持续发展观为指导,借鉴《生态县、生态市、生态省建设指标》以及相关生态环境与区域经济等的评价指标,结合重庆的实际情况,建立了重庆市生态竞争力评价指标和模型,运用主成分分析法,利用SPSS统计分析软件对2002—2012年重庆市生态竞争力进行定量计算与评价,为重庆生态建设与经济发展提供科学依据与实践指导。     

森林类型自然保护区生态保护研究进展

自然保护区的生态有效性是指保护区对其主要保护对象的保护效果。开展自然保护区的生态保护成效评估是明确自然保护区保护效果、实现保护区保护目标的有效途径。从基于自然保护区生态价值、保护对象、森林资源、森林健康以及保护区生态系统服务功能的评估5个方面,归纳分析了国内外森林类型自然保护区生态保护成效评估,并尝试构建我国森林类型自然保护区生态保护成效评估指标体系,为更好地引导森林类型自然保护区提升保护效果,使生物多样性得到更好的保护提供借鉴。     

基于草地退化指示植物大狼毒的植被指数研究

为建立基于指示植物的滇西北地区草地退化遥感评价技术体系,将有毒植物大狼毒（Euphorbia jolkinii）作为草地退化的指示植物,筛选并构建了反映草地群落中大狼毒组分信息的植被指数。结果表明：部分特殊样地有可能放大GPS定位偏差对植被指数与地面调查指标相关性研究的不利影响,最好予以剔除。现有的植被指数与大狼毒调查指标的相关性略低于其与总体调查指标的相关性,不适合作为大狼毒的遥感监测指标。采用Landsat 5卫星第5波段影像校正后的植被指数与大狼毒调查指标的相关性增加,而与总体调查指标的相关性降低,在弱化样地总体群落信息、突出大狼毒组分信息方面GNDVIc表现最佳,较适用于草地群落中大狼毒组分的遥感监测。