该研究首次借助林冠塔吊调查了西双版纳国家级自然保护区龙脑香热带雨林样地内69棵树13个垂直高度上的附生苔藓植物,结果表明:目标样树上共记录到隶属于25科60属的90种附生苔藓,其中细鳞苔科物种数最多,占比达25.6%。13个垂直高度上共划分出三种生态类型:喜阳苔藓(散生巨树上>45 m 的区域),喜阴苔藓(乔木树干上<15 m的区域),广布苔藓(广泛分布于宿主各个垂直高度上,生态位宽),并筛选出对微生境有特殊偏好的17种苔藓指示种(IndVal≥0.7, P <0.05)。随宿主垂直高度的升高,扇型和交织型的苔藓占比降低,悬垂型苔藓占比先升高后降低,细平铺型和粗平铺型的苔藓占比升高。大气湿度、水汽压、胸径以及树皮粗糙度对附生苔藓生活型的分布偏好具有显著影响。总之,沿宿主垂直高度上的附生苔藓对微环境变化在生活型和形态结构上有着不同的响应方式,而同一种生态型的苔藓群落有相似的适应机制。因此,在森林林冠生境变化的监测和管理中,对微生境具有明显偏好的附生苔藓物种可作为有效的指示材料。
AFoCo(Asian Forest Cooperation)Project in 2011 has funded a research and development project in Malaysia for enriching a mono-species stand established in an ex-tin *** project covered only for a period of 12 months.A...
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AFoCo(Asian Forest Cooperation)Project in 2011 has funded a research and development project in Malaysia for enriching a mono-species stand established in an ex-tin *** project covered only for a period of 12 months.A study plot of 1 ha size was established in TTAC(Tin Tailings Afforestation centre).Twenty indigenous tropical rainforest tree species were planted and their five year-old survival count,diameter and H(top height)growths are reported in this *** of them are red list species of IUCN(International Union of Conservation of Nature).The survival of the 1 ha planting trial was 53%.Mortality of the tree species is mainly caused by wild *** tropical rainforest tree species in this planting trial had similar growth to those planted at good mineral *** paper also documented the tending treatments which were implemented during post-planting that have contributed to healthy growth of the mixed-species *** mixed-species stand is being properly tended till to-date and hence sustained growth of the stand is anticipated.
This paper is concerned with the determination of the thermal energy performances of individual houses built with "H" shape bricks in hot and dry tropical climate (different cities of Burkina Faso and the city of Bama...
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This paper is concerned with the determination of the thermal energy performances of individual houses built with "H" shape bricks in hot and dry tropical climate (different cities of Burkina Faso and the city of Bamako in Mali). The bricks" matrices include three void spaces which are filled during construction with either clay-grass mixture or with entirely clay matter. After measuring the diffusivity of the clay matter and cement bricks samples utilizing the Flash method, we determine the "H" shape bricks" thermal equivalent conductivity using the HEAT software. The house, modeled utilizing the TRNSYS software, reveals that, besides their economical and environmental advantages, houses constructed with "H" shape bricks filled with clay, show approximately the same energy consumption patterns as void cement bricks houses. On the other hand, houses built utilizing "H" shape bricks filled with clay-grass mixture, which have low thermal conductivity, show a reduced air conditioning load. We also study the influence of the building orientation on the energy consumption.
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