Growth and yield of nine pine species in Angola

来源 :Journal of Forestry Research | 被引量 : 0次 | 上传用户:ab7268062
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
A species introduction experiment including several tropical pines and eucalypts was established in 1966/1967 in the Tchianga research station in Angolan Highlands. Despite 27 years of political conflict (1975-2002) and lack of management, the research experiment has remained relatively well conserved. We measured the best conserved plots that were 41 years old in 2007 to obtain information on the growth of different pine species. We calculated stand characteristics including basal area, dominant height, mean diameter, and stand volume for Pinus patula Schiede ex Schiltdl. Et Cham., Pinus pseudostrobus Lindl., Pinus kesiya Royle ex Gordon, Pinus devoniana Lindl., Pinus chiapensis (Martinez) Andresen, Pinus elliottii Engelm., Pinus greggii Engelm. Ex Parl., Pinus montezumae Lamb. and Pinus oocarpa Schiede ex Schltdl. The growing stock volume at 41 years was the highest in P. pseudostrobus, 1,325 m3·ha-1, followed by P. kesiya with 1,200 m3·ha-1. The widely planted P. patula had a growing stock volume of 892 m3·ha-1. P. oocarpa and P. pseudostrobus had the highest stand basal area, over 80 m2·ha-1. Using increment core analyses we studied the temporal development of stand characteristics. Analysis of the mean annual increment (MAI) showed that rotation lengths of 20-30 years would maximize wood production. With these rotation lengths, the MAI of P. pseudostrobus would be 35 m3·ha-1. Other productive species were P. kesiya, P. oocarpa and P. chiapensis. P. patula had a maximum MAI of 20 m3·ha-1. P. greggii had the lowest mean annual volume production, only about 13 m3·ha-1. A species introduction experiment in several tropical pines and eucalypts was established in 1966/1967 in the Tchianga research station in Angolan Highlands. Despite 27 years of political conflict (1975-2002) and lack of management, the research experiment has been relatively well conserved. We measured the best conserved plots that were 41 years old in 2007 to obtain information on the growth of different pine species. We calculated stand characteristics including basal area, dominant height, mean diameter, and stand volume for Pinus patula Schiede ex Schiltdl. Et Cham Pinus kosiya Royle ex Gordon, Pinus devoniana Lindl., Pinus chiapensis (Martinez) Andresen, Pinus elliottii Engelm., Pinus greggii Engelm. Ex Parl., Pinus montezumae Lamb. And Pinus oocarpa Schiede ex Schltdl. The growing stock volume at 41 years was the highest in P. pseudostrobus, 1,325 m3 · ha-1, followed by P. kesiya with 1,200 m3 · ha-1. The widely planted P. patula had a grow ing stock volume of 892 m3 ha-1. P. oocarpa and P. pseudostrobus had the highest stand basal area, over 80 m2 ha-1. Using incremental core analyzes we studied the temporal development of stand characteristics. Analysis of the mean With these rotation lengths, the MAI of P. pseudostrobus would be 35 m3 · ha-1. Other productive species were P. kesiya, P. oocarpa and P. chiapensis. P. patula had a maximum MAI of 20 m3 · ha-1. P. greggii had the lowest mean annual volume production, only about 13 m3 · ha-1.
其他文献
从事教学工作30多年,毕业生送走了一批又一批,有的成了行业的骨干精英,有的成了行业的翘楚。回首从教的历程,展望学生的成长经历,在学生良好行为习惯的培养方面深受启发,谈几
贵州省雷山县有“中国苗族文化中心”之誉,除了游人纷至的西江千户苗寨和郎德苗寨,还有许多苗寨隐藏在大山之间.略苗族多彩多姿的风情,莫过于到那里去过上个苗年,就有如沈从
随着教育改革的深入进行,高中政治课堂逐渐演变为中学阶段德育教育的重要场所,但是,当代高中生个性都十分明显,对于思想政治的学习并不是十分投入,高中政治教师应结合实际情
期刊
We improved the overall performance of fast-growing poplar by utilizing a low-cost, effective and simple method.The fast-growing poplar was modified by a vacuum
Windthrow problem is a difficult task for the forest managers in the Romanian Carpathians and especially in Iezer Mountains. The last windthrow, in July 2005, a
该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生、测量监控等方面人手,介绍了S226海滨大桥
期刊
该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生、测量监控等方面人手,介绍了S226海滨大桥
上市公司财务信息披露的质量,既关系着股东的利益,又关系着证券市场的稳定。上市公司信息披露上市公司信息披露一般是指上市公司从维护投资者权益和资本市场运行秩序出发,按
摘要 紫砂花器造型万千,一套花器套壶观之精美,其中创作要素甚多,紫砂艺人自身的制作技艺、人文修养、美术功底等缺一不可。套壶是有思想主题的完整艺术作品,而不是杂乱的堆砌,值得紫砂艺人不断地摸索、探究。现以紫砂“花开富贵套壶”为例,谈谈套壶的设计艺术。  关键词 花开富贵套壶;工艺设计;陶刻  宜兴紫砂陶是集陶瓷工艺与雕塑、绘画、书法、文学、金石艺术于一体的综合性艺术。紫砂壶、紫砂盖杯、礼品杯、茶道专
期刊