|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Diversity and structural composition of species in dipterocarp forests:a study from Fasiakhali Wildlife Sanctuary, Bangladesh显示文摘Fasiakhali Wildlife Sanctuary is a protected area composed of tropical remnant rainforest that harbor substantial number of large,old Garjan(Dipterocarpus spp.)trees.The present study assessed composition,structure and diversity of the species in this protected area.A total of 32 trees species were recorded with DBH ≥ 11 cm belonging to 24 genera and 19 families.The forest is low in plant diversity as represented by Shannon–Wiener diversity and Simpson Dominance indices.Dipterocarpus turbinatus was the most dominant species with maximum relative density,frequency,dominance,and importance value index.Syzygium firmum and Tectona grandis followed in terms of dominance.The structural composition indicated higher number of individuals in the medium growth classes(41 to < 511 cm DBH and 16–20 m height ranges),whereas D.turbinatus was the only species that dominated most of the growth classes.Poor stem density in lower growth classes indicated meager recruitment of regeneration which may be due to lower annual precipitation,increased grazing and encroachments.This study will help to understand the patterns of tree species composition and diversity in the remnant dipterocarp forests of Bangladesh.It will also contribute to identifying threatened plants to undertake D.turbinatus based conservation and sustainable management of the Fasiakhali Wildlife Sanctuary. | S.C.Das M.S.Alam M.A.Hossain | 2018 | Journal of Forestry Research2018，29，5： | 3 |
| 2 | 茶树组织培养:植株再生和在苗圃中的移植生长显示文摘在含0.5mg/1IBA的滤纸桥系统和液体振荡培养及在土壤:泥炭(1:1)混合物中,获得了根的产生.虽然用液体振荡培养方法其根的发生较快,但这些植株移植在土壤中的生长较差;在土壤和泥炭混合物中直接生根虽然较慢,但将植株定植在大气环境的土壤中生长较好.将植株用低温、漫射光和高湿度预处理,能使植株更加强壮,且提高了植株在苗圃中的移植成功率.本研究的目的在于:a)发展一种再生苗有效生根的技术;b)使生根苗成功地移植于土壤的技术标准化;c)使植株适应大田环境. | S.C.Das T.T.Barman R.Singh | 1990 | 茶叶科学技术1990，0，4： | 0 |
| 3 | 从含有机添加剂的氯化铅电解液中电积铅显示文摘对含添加剂的氯化铅电解液进行了电积铅的研究。添加剂分别为松香,镁絮凝剂,明胶,骨胶,β—荼酚以及骨胶加β—荼酚。初步研究表明,同时含骨胶及β—荼酚添加剂的氯化物电解液,可产出较致密的铅沉积物,且电流效率较高。研究了铅、骨胶与β—荼酚的浓度、溶液pH值,温度、电流密度等参数对电流效率,沉积物特性及阴极电位的影响。结果表明,当电解液含铅30g/l,骨胶2g/l β—荼酚0.1g/l,pH0.75~0.95,温度70℃及电流密度50A/m^2时,可获得致密铅,其电流效率约90%。搅拌电解液可提高电流效率约5%,并使沉积物特性得到改善。 | S.C.DAS 李义根 | 1990 | 有色矿冶1990，6，2： | 0 |
| 4 | 镍电积过程中杂质元素Co2+、Cu2+、Fe2+、Fe3+对电积产品质量的影响显示文摘本论文确定了在镍电积过程中杂质元素Co2+、Cu2+、Fe2+、Fe3+对电流效率、物理外观、纯度、结晶位相和表面极化以及沉积过程中极化行为的影响。同时研究了在这些杂质超过浓度范围的情况下电流效率没有显著的变化,然而在沉积过程中的物理外观和杂质元素之间有某种关系变化。在500ppm的情况下,CO2+的溶限最大,5ppm时最小,在任何杂质存在的情况下可以观察到从fee没有镍结构的偏移,但随着各种杂质元素的不同,不同结晶位相的峰值也不同,随着杂质浓度的增加,各种值也会发生变化。在有杂质元素存在的情况下,镍电解沉积的表面形态也发生了变化。在有除了CU2+外的杂质元素的存在的情况下,镍沉积的扫描曲线均发生的偏离。基于此结果,做了各种考察因素的影响以及相互关联方面的研究尝试。 | S.KGOGIA S.C.DAS 栾彩虹 孙甄燕 | 2014 | 金川科技2014，0，4： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员