共查询到19条相似文献，搜索用时 203 毫秒
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高光谱遥感森林叶面积指数估测方法研究 总被引：2，自引：1，他引：1
叶面积指数(LAI)是反映植物叶片数量、冠层结构变化、植物群落生命活力及其环境效应的重要参数,其定义为植株所有叶片单面面积总和与植株所占的土地面积的比值。文中总结国内外利用高光谱遥感数据估测森林叶面积指数的研究进展,并对众多的估测方法进行比较,最后分析了高光谱遥感森林叶面积指数估测研究的发展趋势。
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突显校园生态文化——安徽大学新校区植物景观设计 总被引：5，自引：2，他引：3
根据安徽大学新校区南实验楼——笃行南楼的现状与特点,以安徽大学校训"至诚至坚,博学笃行"为规划构想,对文化内涵、环境空间和植物配置进行细致分析,在保持对称风格的基础上,提出了"体现景观特色,营造文化家园"的设计思想,将中西空间理念相结合,遵循自然式植物配置原则,在相似的空间环境中,展现不同的景观效果,体现环境宜人,独具特色的校园风貌。
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本文以南宁市嘉和城苗圃为对象,通过对植物外部形态进行感观鉴定,对植物的叶、芽、枝、整株等的生长指标、组织褐变等进行观察,把园林植物受寒冻害程度划分为五个等级,然后根据等级评价标准,对2011年苗圃园林植物受寒冻害情况进行调查与数据收集分析。结果表明,持续低温给苗圃园林植物造成明显寒冻害,热带植物种类抗寒性差,受寒冻害严重,甚至整株死亡,多为IV-V级。合理选择植物品种、做好寒冻害来之前的防寒措施和植物受冻后的及时补救措施是避免园林植物大面积受寒冻害的关键措施。 相似文献
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深圳梅林山公园乡土植物群落景观设计 总被引：2，自引：1，他引：1
合理应用乡土观赏植物,营造"近自然"植物群落景观,是当今园林绿化的发展趋势。深圳市梅林山公园具有丰富的植被类型和植物资源,绿化设计根据现有植被类型的不同特点,提出相应的改造和恢复方法。对于生态和景观效益好的沟谷季雨林、低地常绿季雨林、山地常绿阔叶林、常绿落叶混交林,采用封山育林的策略,促进其自然演替;对于人工林、果林、灌草丛、防火林和采石场,有针对性的选取优良乡土植物进行改造和恢复;对于景区和登山路的绿化设计,采用乡土和园林植物相结合,营造自然、美观、保健和生态的群落景观。 相似文献
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通过对广州市车陂涌河岸带人为干扰较少的 5 个河段的草本植物群落特征进行调查,分析河
岸带的物种多样性和影响河岸带植被分布的主要因素,总结适宜广州河岸带生态护岸的草本植物。经统
计,河岸带样方内共有草本植物 57 种,隶属于 23 科 51 属,禾本科与菊科植物最多,分别占 10 种和 8
种。本土植物 47 种,外来入侵植物 10 种,存在外来生物潜在入侵危险。群落结构复杂,物种组成繁多。
结合生态护岸原则和调查结果,最终筛选出节节草 Commelina diffusa、柔枝莠竹 Microstegium vimineum、
红尾翎 Digitaria radicosa 等 10 种本土植物作为生态护岸植物进行推广。 相似文献
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园林植物叶面积指数研究进展 总被引：5，自引：0，他引：5
本文对园林植物叶面积指数(LAI)研究的进展进行了综述,详细介绍了LAI的定义、LAI的主要测定方法、LAI与枝干的相关关系、LAI的应用现状,并对园林植物叶面积指数的研究前景进行了讨论。 相似文献
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Effects of multiple factors on plant diversity of forest fragments in intensive farmland of Northern Portugal 总被引：1，自引：0，他引：1
Angela Lomba Joana Vicente Francisco MoreiraJoão Honrado 《Forest Ecology and Management》2011,262(12):2219-2228
The joint and independent effects of dominant tree species, forest patch spatial attributes, and forest structure and management as drivers of plant species richness and composition in small forest patches scattered within an intensive agricultural landscape were addressed.In a landscape with scattered urban and intensive dairy agricultural areas in north-west Portugal, within which small forest patches (dominated by pines, eucalypts, or both) represent semi-natural habitat islands, 50 small forest patches, with areas ranging between 0.3 and 3 ha, were selected and surveyed for vascular plant diversity, within dairy farming landscape mosaics dominated by annual forage crops. Explanatory variables were composed of three datasets derived either from GIS mapping or field observations: forest type (dominant tree species), forest patch spatial attributes (patch area and shape index), and measures of forest management and structure (diameter at breast height, tree density per hectare, and percentage cover of vegetation strata). Variations in these forest patch attributes were assessed across forest types, and related to measures of plant diversity (total, native, alien, woody, and herbaceous species richness). Redundancy analysis with variance partitioning was applied to evaluate the joint and independent effects of the three sets of variables on species assemblages. The recent shift in canopy dominance from pine to eucalypt observed in the region appears to be related to a (nonsignificant) tendency for the increase of patch area and to the decrease of patch complexity, as well as several changes in forest structure and management, expressed as a trend to denser tree canopies and lower cover of understory plants. Dominant tree species and attributes related to forest structure and management were the most important factors determining plant diversity. The joint effect of the dominant tree species and forest structure and management resulted in lower levels of plant species richness in eucalypt plantations. These were also more prone to invasion by alien species, probably due to decreased biotic resistance from unsaturated native plant assemblages. Our results draw attention to the importance of dominant tree species and management practices for the maintenance of plant diversity levels (species richness and composition) in dairy landscape mosaics, highlighting the importance of the remnants of semi-natural forests as refuges for plant diversity in the landscape context. Nonetheless, forest plant diversity could further be fostered by promoting naturalness of pine stands and the regeneration of native oak woodlands in some forest areas. This would also diversify the range of ecosystem services that could be provided by forest areas in these peri-urban farmlands. 相似文献
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Letizia Martorana Maria Cristina Foti Gabriele Rondoni Eric Conti Stefano Colazza Ezio Peri 《Journal of pest science》2017,90(4):1079-1085
Plants respond to insect attack by emission of volatile organic compounds, which recruit natural enemies of the attacking herbivore, constituting an indirect plant defence strategy. In this context, the egg parasitoid Trissolcus basalis is attracted by oviposition-induced plant volatiles emitted by Vicia faba plants as a consequence of feeding and oviposition by the pentatomid host Nezara viridula. However, this local tritrophic web could be affected by the recent invasion by the alien pentatomid bug Halyomorpha halys, an herbivore that shares the same environments as native pentatomid pests. Therefore, we investigated in laboratory conditions the possible impact of H. halys on the plant volatile-mediated signalling in the local tritrophic web V. faba–N. viridula–T. basalis. We found that T. basalis wasps were not attracted by volatiles induced in the plants by feeding and oviposition activities of H. halys, indicating specificity in the wasps’ response. However, the parasitoid attraction towards plant volatiles emitted as a consequence of feeding and oviposition by the associated host was disrupted when host, N. viridula, and non-associated host, H. halys, were concurrently present on the same plant, indicating that invasion by the alien herbivore interferes with established semiochemical webs. These outcomes are discussed in a context of multiple herbivory by evaluating the possible influences of alien insects on local parasitoid foraging behaviour. 相似文献
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园林植物引种是历史悠久且永恒的主题,也直接导致了外来植物的比例升高;与此同时,气候变化和土地利用方式的改变又致弱了生态系统韧性,加剧了生物入侵风险。文章在介绍引种和入侵基本概念的基础上,阐述城市生境的可入侵性和外来植物的入侵能力,并提出了预防、控制和利用入侵植物的具体措施,旨在为增加城市生物多样性及有效防止入侵提供对策。 相似文献