Vertical profiles of environmental factors within tropical rainforest, Lambir Hills National Park, Sarawak, Malaysia     

Tomo’omi Kumagai  Koichiro Kuraji  Hironori Noguchi  Yuri Tanaka  Katsunori Tanaka  Masakazu Suzuki 《Journal of Forest Research》2001,6(4):257-264

Environmental factors, such as global solar radiation, wind speed, air temperature, humidity, and CO₂ concentration, were measured above and within the canopy of a tropical rainforest in Lambir Hills National Park, Sarawak, Malaysia. Few data concerning the environment of this forest have been reported. Intensive observations were carried out in 1998, 1999, and 2000 with the following results: (1) The fraction of global solar radiation reaching the upper layer of the canopy varied with global solar radiation above the canopy. Even though the global solar radiation above the canopy fluctuated, the fraction of that reaching the lower canopy and the ground was constantly approximately 5%. (2) The fraction of wind speed reaching each layer of the canopy increased with wind speed above the canopy. Little wind was usually present at the lower canopy. (3) The daytime air temperature at the canopy top was higher than that near the ground. The maximum difference between the air temperature at the canopy top and that at the ground was about 5°C, and the diurnal temperature ranges at the canopy top and those at the ground were about 8°C and about 5°C, respectively. The highest daytime water vapor pressure occurred within the canopy and particularly near the ground. Vertical gradients of water vapor pressure during the day were steep, probably because of high transpiration. (4) In the 1998 observation the minimum and the maximum CO₂ concentrations were 360 ppm in the day and 450 ppm at night, while in the 2000 observation the minimum and the maximum CO₂ concentrations were 350 ppm in the day and 540 ppm at night. The higher CO₂ concentration in the daytime and the lower concentration at night observed during the 1998 observation period were probably due to reduced photosynthesis and soil respiration caused by exceptional dry conditions during the observation period.  相似文献   

Growth and yield prediction models for Acacia mangium grown in the plantations of the central region of Bangladesh     

Shah Newaz  M.  Millat-e-Mustafa  M. 《New Forests》2004,27(1):81-88

Acacia mangium is a very fast growing species belonging to the family Leguminosae that has been introduced in the plantations in Bangladesh for its faster growth and wide range of adaptability. The present study aimed at development of growth and yield prediction models for the species using simultaneous equation method. Models were selected for the species to estimate stand dominant height, stand diameter, stand basal area per hectare and total volume yield per hectare. Paired t-test, 45-degree line test, percent absolute deviation and biological principle of stand development were used for the validation of chosen models. The results suggest that the models derived were statistically and biologically acceptable and could be satisfactorily used for stands of Acacia mangium of ages 4–7 yrs based on a base age of 6 yr.  相似文献   

Canopy recruitment in the beech (<Emphasis Type="Italic">Fagus engleriana</Emphasis>) forest of Mt. Shennongjia,Central China     

Quanfa Zhang  Mingxi Jiang  Feng Chen 《Journal of Forest Research》2007,12(1):63-67

A dendrochronological technique was used to investigate canopy recruitment of beech (Fagus engleriana Seem.) trees in western Hubei Province of Central China by identifying growth releases through gap formation. The results indicated that 83% and 17% of the canopy trees regenerate in gaps and the understory, respectively. Radial growth analyses demonstrated that there are three modes for beech regeneration and canopy recruitment: (1) gap origin without suppression; (2) gap origin with period(s) of suppression; and (3) understory origin. Multiple periods of release and suppression imply that beech regeneration and canopy recruitment are very sensitive to gap formation.  相似文献   

江门市东湖公园北园区绿化景观设计   总被引：1，自引：0，他引：1  

陈霞  张杜明 《广东林业科技》2003,19(3):58-60

江门市东湖公园北园区是东湖公园的新扩区，在绿化景观设计上，突出自身特点，营造自然、鲜明的绿化景观，并与其它园区相协调和互相衔接，构建了优美的城市景观。  相似文献   

中东欧前社会主义国家森林私有化概况与发展趋势   总被引：2，自引：1，他引：2  

孔凡斌  宋诚英 《世界林业研究》2005,18(5):72-73

概括介绍了中东欧前社会主义国家林权私有化的现状、面临的种种挑战和发展趋势。  相似文献   

浅析唐山市玉田县中心广场景观设计     

刘凤敏  孙二海 《河北林果研究》2007,22(4):414-416

唐山市玉田县中心广场景观设计,结合了玉田的历史文化,努力做到与周围环境协调统一,构思新颖、布局合理、手法独特、材料创新,达到了理想的效果。该景观设计为小城镇中心广场的绿化设计提供了借鉴。  相似文献   

Effect of collection date on capsule moisture content and germination of Populus ciliata Wall. ex Royle from central Himalaya     

Pandit  Atul  Pant  Kavita  Ram  Jeet 《New Forests》2002,23(2):121-130

Seed maturity indices of Populus ciliata were investigated in collections from Sukhatal and Bhowali. Across both seed sources, mean capsule size varied from 68.0±1.5 mm² to 72.0±0.9 mm², while mean number of capsules/100 grams varied from 268±8 to 295±12. Mean weight of 100 capsules varied from 25.0±1.4 g to 27.0±1.4 g. Weight of 100 capsules among sources and individual trees differed significantly (P < 0.05), while number of capsules/100 grams and weight of 100 capsules was negatively correlated (r² = 0.69). As capsules matured moisture content decreased from 83.2±1.1% to 54.3±0.3% at Sukhatal and from 77.7±0.4% to 46.4±0.3% at Bhowali. The optimum germination was at 58–60% moisture content. Maturation was related to capsule colour changes as well as moisture content. These parameters were judged to be good indicators of when to collect P. ciliata seeds.  相似文献   

中原崛起与绿色中原建设   总被引：3，自引：0，他引：3  

曹庭珠 《林业资源管理》2007,(1):43-46

中原崛起对于中部地区崛起、全国区域经济协调发展具有全局意义。实现中原崛起,全面建设小康社会,必须全面贯彻落实科学发展观,加快环境友好型社会建设,发展林业,推进绿色中原建设。针对中原崛起中的生态环境问题,根据河南省经济发展态势、资源禀赋条件、林地利用状况,研究提出了绿色中原建设的目标任务、资源配置和保障措施。  相似文献   

基于火强度的西山国家森林公园主要可燃物类型划分     

王秋华  单保君  徐伟恒  李世友  刘世远 《防护林科技》2015,(5)

通过外业调查和室内测定,获得西山国家森林公园主要可燃物的相关参数,输入BehavePlus模型,得到潜在火行为参数,以火强度大小为主要指标划分主要可燃物类型,结果表明:在坡度分别为25°和35°情形下,高强度火的林分为地盘松林、麻栎林和云南油杉林,中强度火的林分是华山松林和滇青冈林,低强度火的林分只有旱冬瓜林。研究结果可合理划分火险等级,实施科学的火管理。  相似文献   

东莞国家城市湿地公园植物生态化管理与利用研究     

黄娜  吴鹏举  李翠丹 《林业调查规划》2015,40(2)

东莞国家城市湿地公园是人工修复重建型湿地的典型代表。针对湿地公园内植物构建成效,在实地调查和查找文献资料的基础上,分析湿地公园内植物的类型、分布以及植物构建现状和存在的问题,提出了湿地公园植物生态化管理与利用的对策建议。  相似文献