当前沙棘木蠹蛾研究中存在的主要问题

沙棘木蠹蛾的大面积暴发,使得其控制研究取得了前所未有的进展,从基础性研究到多种控制方法的实施,都在一定程度上控制了沙棘木蠹蛾的进一步发生和危害。然而,在研究过程中,也出现了许多分歧和问题。为此,本文对沙棘木蠹蛾的研究现状、研究中所存在的问题以及控制技术等方面进行了详细的研究和探讨,以期为沙棘木蠹蛾的综合控制提供较好的理论依据,同时为更有效地控制其危害提供理论指导。     

广东省林木种苗工程建设现状与发展对策

文章概述了广东省林木种苗工程项目建设的现状,总结分析了其存在的主要问题,并提出了解决问题的对策。     

基于SWOT分析的腾冲县核桃产业发展对策研究

采用SWOT分析法,分析腾冲县核桃产业发展情况,优势为:土壤、气候适宜,产业发展基础好,旅游人流量大;劣势为:品种莨莠不齐,科技支撑水平低,资源投入不足,深加工水平低等;机会为:市场前景广阔,政策支持等;威胁为:市场竞争激烈,替代产品威胁。藉此从SO战略、WO战略、ST战略和WT战略4个方面提出核桃产业发展对策。     

我国森林蔬菜的开发利用现状与前景

对我国森林蔬菜开发利用的意义、现状和存在的问题进行了综述,并结合存在的问题提出了具有可行性的建议和对策,以期为森林蔬菜开发利用研究提供一些理论性的依据,使我国森林蔬菜产业早日走上规模化、国际化道路.     

紫金山鳞翅目害虫风险分析、预测及防控策略

通过对南京紫金山不同植被类型鳞翅目昆虫群落结构及时空动态的调查,综合其优势种类、本地和省级历史危害种类;经过研究和分析影响紫金山鳞翅目有害生物危险性的各种相关因子以及这些相关因子的地位、作用和相互之间的关系,分别采用多指标综合评估法、经验综合评估法对紫金山不同植被类型中可能造成危害的各类鳞翅目风险源进行了风险分析和风险预测,并提出了相应的防控策略。     

Differential responses of Bolivian timber species to prescribed fire and other gap treatments

We followed the establishment and growth response of 13 commercial tree species to canopy opening, above-ground biomass removal, and experimental burns of low and high intensities in a lowland dry forest in Bolivia. Three patterns of response to treatments were observed among the most abundant commercial tree species. (1) Shade-intolerant species regenerated mostly from seed and had the highest survival and growth rates following high-intensity burns. (2) Shade-tolerant species were abundant in gap control and plant removal treatments. Treatments had little effect on the height growth of these species. (3) Individuals of root sprouting species were most abundant following plant removal and low-intensity burn treatments. Treatments had little effect on the height growth of these species. The wide variation in species responses to gap treatments found in this study not only reinforces the concept that species are distributed along a continuum of shade-tolerance levels, but that other aspects of species biology, such as seed dispersal type or sprouting behavior, further differentiate regeneration strategies. The variety of regeneration strategies found among the species at this forest site will require a flexible management scheme that mixes more intensive silvicultural treatments such as prescribed burning with less intensive treatments.     

黄河下游断流影响及东营引黄对策

东营市拥有丰富的土地资源,现有灌溉面积１４．２万ｈｍ＾２,随着工农业生产的发展,需求量越来越大;黄河水资源日益紧张,黄河断流的影响影响也越来越大,因此,针对东营引黄的实际,提出了如下引黄供水的对策;进行灌区老化工程技术改造;修建平原水库;充分利用灌溉间隙,引黄蓄灌源;加强经济调控,合理调整水价;节约用水;严格控制退水,充分利用退水。     

农民创业培训的实践与发展

根据吉林省农村不同地区经济结构和产业特点,以科学发展观为指导,面向"三农"和社会主义新农村建设,在开展农民创业培训、如何结合地方经济发展实际,用科学、创新的理念推进农民工再就业培训工作等方面进行了探讨;并提出了今后发展农民创业培训的对策.     

Determinants of income-earning strategies and adoption of conservation practices in hillside communities in rural Honduras

Based on the results of participatory diagnostic surveys conducted in 95 rural communities in the hillsides of Honduras, we determine income earning strategies at the community level; identify their main determinants; and analyze the adoption of of conservation practices. Eight income-earning strategies were distinguished that reflect differences in comparative advantage between communities. We explain the choice of income earning strategy using a multinomial logit model that includes biophysical, economic, social and institutional variables. We use a probit model to show that adoption of conservation practices is determined by the type of income earning strategy, population density, market access, and organizational variables.     

洞庭湖退田还湖区畜产品质量与畜牧业发展对策

对洞庭湖退田还湖区畜禽产品质量分析结果表明,牛肝是微量元素和重金属元素富集能力最强的副产品,而猪肾对Cd有很强的富集能力;示范区目前饲养条件下畜禽肉、蛋产品基本符合国家无公害食品卫生标准,但副产品中重金属指标Cr、Cd、Pb则普遍超标。并指出加强对畜禽饲料原料和产品质量全程监控与管理,循序渐进推动项目区畜牧业向无公害、绿色或有机方向发展,是退田还湖示范区畜牧业可持续发展的关键。