...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Agricultural and Forest Meteorology >Canopy level fog occurrence in a tropical lowland forest of French Guiana as a prerequisite for high epiphyte diversity
【24h】

Canopy level fog occurrence in a tropical lowland forest of French Guiana as a prerequisite for high epiphyte diversity

机译：法属圭亚那热带低地森林的冠层雾发生是高附生植物多样性的前提

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

a- Valley fog leads to differentiation of microclimate and epiphyte diversity. a- Supplemental water and attenuation of radiation have high impact on epiphyte richness. a- The new unique forest type is characterized by frequent fog occurrence. Fog frequency and the meteorological processes leading to fog formation have never been studied in depth in tropical lowland forest areas. This study provides detailed evidence of frequent fog occurrence in lowland valleys of central French Guiana. Fog frequency showed a clear diurnal course, with a maximum before sunrise; average fog duration was 4.6h. The diurnal course of visibility was positively correlated with the diurnal course of humidity in the above-canopy air. Fog persistence correlated significantly with atmospheric parameters during the dry season, but not during the rainy season. The main trigger of fog development in the lowland forest seemed to be precipitation, leading to higher soil moisture, greater evapotranspiration and, thus, higher water content of air. An increasing temperature difference between valley and hill sites after sunset, together with more frequent down-slope winds during nights with long fog periods, points at some influence of katabatic flows. The frequent occurrence of fog in the valleys correlated with significantly higher epiphyte diversities in valley forests as compared to hill forests, and supported the occurrence of the hitherto undescribed, epiphyte-rich "tropical lowland cloud forest" (LCF) in the valleys. The higher epiphyte diversity in LCF coincided with significantly higher relative air humidity in LCF than in hill forest. The ecological benefits of fog for the epiphytes in LCF are surplus of moisture and delayed onset of the stress period, particularly in the dry season.
机译：谷雾导致微气候和附生植物多样性的分化。 a-补充水分和辐射衰减对附生植物丰富度有很大影响。 a-新的独特森林类型的特点是经常发生雾。在热带低地森林地区，尚未深入研究雾的发生频率和导致雾形成的气象过程。这项研究提供了法属圭亚那中部低地山谷频繁发生雾的详细证据。雾的频率显示出清晰的昼夜过程，在日出前达到最大值。平均雾持续时间为4.6h。冠层以上空气的昼夜可见度与昼夜湿度呈正相关。在干旱季节，雾的持久性与大气参数显着相关，而在雨季则没有。低地森林中雾气发展的主要诱因似乎是降水，导致更高的土壤湿度，更大的蒸散量以及空气中的水分含量。日落之后山谷和丘陵地带之间的温差增加，而在长雾时段的夜晚，下坡风更加频繁，这说明了四方流的影响。与丘陵林相比，山谷中频繁发生的雾与山谷林中的附生植物多样性显着相关，并支持了迄今为止从未描述过的，附生植物丰富的“热带低地云林”（LCF）的发生。与山地森林相比，LCF中较高的附生植物多样性与LCF中的相对空气湿度相吻合。雾对LCF附生植物的生态效益是水分过多和胁迫期的延迟发作，特别是在干旱季节。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号