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the tropical secondary forest
相关语句
  热带次生林
     Study on the sun-shine characteristics of the tropical secondary forest gap in the dry-hot season in Xishuangbanna
     热带次生林林窗干热季光照特征初步分析
短句来源
     A Study on the Sun shine Spatial and Temporal Characteristics in the Tropical Secondary Forest Canopy gap in the Different Season in Xishuangbanna
     西双版纳不同季节热带次生林林窗光照时空分布特征
短句来源
     THE TEMPORAL-SPATIAL DISTRIBUTION OF TEMPERATURE ON THE SURFACE ROUGHNESS OF THE TROPICAL SECONDARY FOREST GAP IN XISHUANGBANNA,YUNNAN PROVINCE
     西双版纳热带次生林林窗近地层温度时空分布特征
短句来源
     The results show that the daily variation in air temperature has 2 to 3 peaks at the different sites (4 azimuth) in the tropical secondary forest gaps and the daily mean air temperature ranks in the order of gap edge >expended gap edge >forest interior.
     结果表明 :热带次生林林窗 4个方位不同位置的气温日变化具有 2~ 3个峰值 ; 日平均气温的高低顺序是林窗边缘 >扩展林窗边缘 >林内 ;
短句来源
  相似匹配句对
     Tropical cooking film
     高温蒸煮膜
短句来源
     Tropical Botanical Garden
     热带之梦中心
短句来源
     REVIEW ON THE ARCHITECTURE OF TROPICAL TREES
     热带树木构筑学研究概述
短句来源
     TROPICAL LAWN AND AFFORESTATION IN HAINAN
     海南的热带草坪草与城市绿化
短句来源
     THE CHARACTERISTICS OF THE MOTION IN THE TROPICAL ATMOSPHERE
     热带大气运动的特征
短句来源
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The biomass, growth, annual litter fall, main nutrient contents, and the influences on soil nutrients, soil microbes and soil biochemial activities of secondary forests in Xishuangbarina were studied. Results showed the characteristics of uptake, accumulation and return of biological materials and nutrients in secondary forests, and their effects on soil nutrients. Microbe decomposition of litter fall and biological nutrient cycling of secondary forests were also dealt with....

The biomass, growth, annual litter fall, main nutrient contents, and the influences on soil nutrients, soil microbes and soil biochemial activities of secondary forests in Xishuangbarina were studied. Results showed the characteristics of uptake, accumulation and return of biological materials and nutrients in secondary forests, and their effects on soil nutrients. Microbe decomposition of litter fall and biological nutrient cycling of secondary forests were also dealt with. The study provided a basis for further research of tropical forest ecosystem. The plants grew quickly in the tropical secondary forests. The uptake of nutrient elements was large and its proportion of return to uptake was about 0.5. A great quantity of nutrient elements was accumulated in plants with increasing age of trees, and soil nutrient content was low. With increasing age of secondary forests, uptake,accumulation and return of nutrient elements increased, the intensity of litter fall decomposition increased and the speed of material cycling was quick.

本文获得了西双版纳热带雨林,砍伐后2块处于恢复演替阶段不同年代的次生林的生物量、生长量、年凋落物量及它们的主要营养元素含量、对土壤养分状况的影响、以及土壤微生物状况和土壤生化活性等一系列资料。阐明了次生林生物物质和养分吸收、积累和归还的特点及对土壤养分状况的影响,研究了土壤微生物对凋落物的分解作用,从而对热带雨林次生林的生物养分循环作了一个初步的探讨,为热带森林生态系统研究奠定了基础。研究表明:1.热带雨林次生林植物生长旺盛,营养元素吸收量较大,归还/吸收率在0.5左右,随林龄增大,营养元素大量贮存于植物体中,土壤养分相对贫乏。2.次生林随林龄增大,营养元素的吸收、贮存、归还量增大,土壤微生物对凋落物的分解强度增强,物质循环速度加快。

Light intensity measurements in the tropical secondary forest canopy gap were conducted in Xishuangbanna, Yunnan, in January 1999(foggy-cool season). On the basis of this measurement, spatial-temporal variations of light intensity on 8 azimuth in the secondary forest canopy gap were discussed. The results indicated that: Because of the influence of Condition of foggy environment and the tree, the light intensity is significant different in the gap, showing that temporal and spatial-temporal...

Light intensity measurements in the tropical secondary forest canopy gap were conducted in Xishuangbanna, Yunnan, in January 1999(foggy-cool season). On the basis of this measurement, spatial-temporal variations of light intensity on 8 azimuth in the secondary forest canopy gap were discussed. The results indicated that: Because of the influence of Condition of foggy environment and the tree, the light intensity is significant different in the gap, showing that temporal and spatial-temporal variation of light intensity is not significant in the morning in the study site; after the fog lifting, due to the influence of radiation, the light intensity significantly increase on all sites, the second-east edge of gap is dominant; the maximum mean value of light intensity was shifted to the North-east edge, on the other hand, because of the influence of shade of the edge-arbor, second-west sites light intensity mildly increase, becoming source of low light intensity. Asymmetry of light is significant in the gap at noon. At the same time, horizontal gradient becomes significant. With the sun moved west-ward, because of the influence of the shade of tree at the edge of gap, spatial variation of light intensity is not significant in the study site. This result will provide references of studying forest dynamic and bio-diversity.

利用西双版纳雾凉季次生林林窗光照观测资料,探讨了林窗光照的时空变化特征。结果表明:由于天气现象(浓雾)和林窗树木的共同影响,林窗区域光强存在明显的差异;受浓雾影响的上午,光强的时间变化及水平梯度均不明显;11时后雾散日出,在太阳辐射的影响下,各测点光强均迅速上升,尤以林窗偏东侧林缘最为突出;中午的平均光强最大区域由林窗中心向东北侧林缘移动;但在林窗偏西侧,受树木遮蔽影响,光强增加较小,形成平均光强的低值区,使得中午林窗区域光照强度呈现显著的不对称性,同时造成光强水平梯度增大;下午由于太阳西进,林窗区域均受到树木遮蔽影响,光强降低,水平梯度变化趋于和缓。研究结果可为探讨林窗演替、更新机制及林窗生物多样性研究提供参考。

While areas covered with tropical secondary forests are growing fast,the knowledge about their ecological,economical and social benefits is scare.In studies,different definitions of secondary forests are used.This paper will 1)brief the status of the tropical secondary forests,2)go into more details about the most important results of research on dynamics of tropical secondary forests from all relevant disciplines,and 3)identify the research priorities...

While areas covered with tropical secondary forests are growing fast,the knowledge about their ecological,economical and social benefits is scare.In studies,different definitions of secondary forests are used.This paper will 1)brief the status of the tropical secondary forests,2)go into more details about the most important results of research on dynamics of tropical secondary forests from all relevant disciplines,and 3)identify the research priorities concerning the sustainable management of tropical secondary forests from the standpoints of ecology.

全球的热带次生林面积正快速增加 ,但人们对它们的生态、经济和社会效益的了解却十分有限 ,不同研究对次生林的理解和所使用的定义也不一样。在简要介绍热带次生林的现状之后 ,着重回顾热带次生林群落动态研究的主要成果 ,同时简述了现有研究中存在的问题和将来需要研究的重点课题及展望

 
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