基于国际旅游岛建设的文昌现代农业与旅游业发展意见

分析海南国际旅游岛建设的背景下文昌市发展条件与特点，在指出文昌经济发展的六大制约因素及四大潜在动力基础上，重点突出当地农业、旅游业发展方向，提出建设海南高效农业和优质农产品基地、海南东北部优越的度假旅游区、海南东北部高端生活休闲服务区、海南科教文明教育基地四大任务及五大保障措施。     

陆地棉与海岛棉干物质累积分配特性

供试的四个陆地棉品种地上部分干物质累积速度和数量，从现蕾至吐絮始终高于四个海岛棉品种；陆地与棉与海岛棉的所有品种干物质累积速率最快的时间均在初期至有效花期期间。但海岛棉干物质累积最大量到８月２５日止，陆地棉则持续到９月９日；不同时期干 物质分配率的特点是；苗期；叶〉茎，苗期：叶〉茎〉蕾，花苗期：叶〉茎〉铃〉蕾〉花；铃期；铃〉茎〉叶；株铃重累积的最快速率时间，陆地棉与海岛棉均在７月２６日至８月２５日     

The influence of fruit abundance on the use of forest and cultivated field habitats by the endemic Madeira laurel pigeon Columba trocaz: Implications for conservation

This study was conducted over a two year period in the north west of Madeira Island (Macaronesian Atlantic Islands, Portugal). It investigates the relationship between fruiting patterns in the indigenous forest and the use by the Madeira laurel pigeon of forest habitats and cultivated areas. Habitat use observations were carried out using line-transects in forest sites where the availability of fruit (the most important element of the diet) was assessed. The use of agricultural fields was measured indirectly by the assessment of the damage caused to crops. The findings provided strong evidence that bird movements and shifts in abundance are related to fruit usage and availability. The use of fruits is mostly opportunistic but when many species are available, selection was observed. From an ecological perspective, our findings indirectly confirm a high concordance between pigeon diet, studied by microhistological techniques, and habitat use. The use of crops also seems to be mostly opportunistic and is governed by the birds’ movements within the adjacent forest. It is hypothesised that fruit phenology will influence the use of agricultural areas only to the extent that it governs such movements; there is no strong evidence that crops are attacked only when the availability of natural foods is low. Our results suggest that the current management strategy for the forest is adequate for the conservation of this pigeon but that the conservation value of forest edges should be redefined. It is also proposed that crop damage may be reduced by identifying the proximate factors, which lead to the use of specific fields.     

英语词汇与英国文化特色

英语是英国文化的产物,因此必然要烙上不列颠文化的印记。剖析英语词汇这块英国文化的化石,我们可以领悟英国这个“岛国”所特有的文化内容。     

人心果栽培学要点总结及其在海南开发利用前景分析

通过查阅文献,在总结人心果栽培学要点和当前研究初步结果的基础上,提出中国进一步研究的主要方向为:种质资源问题;引种与新品种选育;人心果生长规律;花芽分化规律与雌雄异熟原因、特定品种授粉树的合理配置(组合);人心果果实品质形成的生理生态机理和品质调节的栽培技术;嫁接因流胶而影响成活的机理和克服措施;人心果基础生理学和生态学;人心果果实贮藏加工技术。并指出海南岛是中国人心果栽培的自然适宜区,并具备发展生产的社会条件,具有良好的开发利用前景。     

城市热岛效应的研究进展

随着世界性城市化、工业进程的加快,城市热岛效应越来越强烈,并极大地影响城市生态环境的安全和居民的日常生活,缓解城市热岛已是迫切需要解决的问题。综述了目前城市热岛的生态环境效应、热岛的形成机制、时空分布特征、研究方法的模型和治理与对策等研究的最新进展动态。在总结当前研究的基础上,探讨了城市热岛未来的研究重点和方向。     

DNA甲基化与肿瘤研究进展

对肿瘤研究的不断深入,发现除了基因突变之外,表观遗传改变也与肿瘤的发生发展密切相关。肿瘤表观遗传的改变以DNA的异常甲基化为主。DNA的异常甲基化几乎存在于任何类型的人类肿瘤中,包括皮肤恶性肿瘤。DNA甲基化是指在DNA甲基化酶的作用下,以S-腺苷酸-L-甲硫氨酸为甲基供体,将甲基转移到特定碱基上的过程。基因的正常功能除了依赖于正常结构外,还依赖于正常的甲基化状态。DNA的异常甲基化在肿瘤发生中起重要作用。     

西安城市热岛的时空分布特征

选取1959-2008年西安市常规气象站和城区加密自动站逐小时气温资料,采用城、郊气温对比法研究西安城市热岛效应的时间变化和空间分布。结果表明：西安城市热岛效应逐年增加,具有明显的季节变化特征;热岛强度日变化呈现双峰分布,两个峰值分别出现在05时和21时左右,最低值出现在11时左右。在西安市城区一直存在一个强城市强热岛...     

沙漠水渠人工固沙区沙篙和沙拐枣灌丛的土壤水分特征对比

在古尔班通古特沙漠引水渠沿线建植5a的人工固沙区内,选择自然生长的沙蒿和沙拐枣灌丛,依据冠幅大小设置5个水平距离梯度和4个土层深度梯度.对比研究了二者的土壤水分特征.结果表明,随土层深度的增加,两种灌丛土壤含水量均呈增加趋.,中下部2层(20～40 cm和40～60 cm)土壤含水量显著(P<0.05)高于上部2层(0...     

Conservation biology for suites of species: Demographic modeling for Pacific island kingfishers

Conservation practitioners frequently extrapolate data from single-species investigations when managing critically endangered populations. However, few researchers initiate work with the intent of making findings useful to conservation efforts for other species. We presented and explored the concept of conducting conservation-oriented research for suites of geographically separated populations with similar natural histories, resource needs, and extinction threats. An example was provided in the form of an investigation into the population demography of endangered Micronesian kingfishers (Todiramphus cinnamominus). We provided the first demographic parameter estimates for any of the 12 endangered Pacific Todiramphus species, and used results to develop a population projection matrix model for management throughout the insular Pacific. Further, we used the model for elasticity and simulation analyses with demographic values that randomly varied across ranges that might characterize congener populations. Results from elasticity and simulation analyses indicated that changes in breeding adult survival exerted the greatest magnitude of influence on population dynamics. However, changes in nestling survival were more consistently correlated with population dynamics as demographic rates were randomly altered. We concluded that conservation practitioners working with endangered Pacific kingfishers should primarily focus efforts on factors affecting nestling and breeder survival, and secondarily address fledgling juveniles and helpers. Further, we described how the generalized base model might be changed to focus on individual populations and discussed the potential application of multi-species models to other conservation situations.