检索结果-南通市图书馆

Impact of disturbance from roadworks on Pteleopsis suberosa regeneration in roadside environments in Burkina Faso, West Africa

引用

Journal of Forestry Research 2009年第4期20卷 355-361,I0007页

作者： Fidèle BOGNOUNOU Patrice SAVADOGO Adjima THIOMBIANO Mulualem TIGABU Issaka Joseph BOUSSIM Per Christer ODEN sita guinko Université de Ouagadougou Unité de Formation et Recherche en Sciences de la Vie et de la Terre Swedish Univ. of Agricultural Sciences Faculty of Forest Sciences Southern Swedish Forest Research Centre Centre National de la Recherche Scientifique et Technologique Institut de l’Environnement et de Recherches Agricoles Département Productions Forestières

The seedling population structure of Pteleopsis suberosa and their regeneration mechanisms were investigated in four roadside environments （graded, adjacent, intermediate and ungraded areas） along paved and unpaved roads in West Africa. A total of 203 quadrats of 2 m × 5 m in size were surveyed and placed along transects parallel to the roads. Within each quadrat, the total number of seedlings and the number of living shoots per seedling base were recorded. Regeneration mechanisms were determined by assessing basal and aerial sprouts and excavating the root systems below ground level. The results show that the total seedling density and the densities of single- and multi-stemmed individuals varied significantly （p 〈 0.05） among the four roadside environments. However, all seedlings were produced asexually; root suckers were predominant （98%） compared to water sprout （1%） and coppices （less than 1%）. This study demonstrates that an intermediate level of soil disturbance from grading along paved and unpaved roads may stimulate P. suberosa regeneration by root suck- ering. Road type （paved and unpaved） did not affect seedling density, but was a highly significant variable in relation to the coppicing ability of P. suberosa populations in roadside sites. In conclusion, P. suberosa is a disturbance-tolerant species which can proliferate mainly by root suckering after roadwork disturbance.

关键词： Pteleopsis suberosa roadwork disturbance, seedling, regeneration, root sucker

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Allometric prediction of above-ground biomass of eleven woody tree species in the Sudanian savanna-woodland of West Africa

引用

Journal of Forestry Research 2010年第4期21卷 475-481,524页

作者： Louis Sawadogo Patrice Savadogo Daniel Tiveau Sidzabda Djibril Dayamba Didier Zida Yves Nouvellet Per Christer Oden sita guinko Institut de l'Environnement et de Recherches Agricoles Département Productions Forestières Swedish University of Agricultural Sciences Faculty of Forest SciencesSouthern Swedish Forest Research Centre Ambassade de Suède 93Avenue Roi BaudouinKinshasa-GombeRépublique Démocratique du Congo Consulat Général de France à Pointe Noire (Congo) Valise Diplomatique 128 bis rue de l'Université 75351 Paris 07 SP France Université de Ouagadougou Unité de Formation et Recherche en Sciences de la Vie et de la Terre

Allometric models are necessary for estimating biomass in terrestrial ecosystems. Generalized allometric relationship exists for many tropical trees, but species- and region-specific models are often lacking. We developed species-specific allometric models to predict aboveground biomass for 11 native tree species of the Sudanian savanna- woodlands. Diameters at the base and at breast height, with species means ranging respectively from 11 to 28 cm and 9 to 19 cm, and the height of the trees were used as predictor variables. Sampled trees spanned a wide range of sizes including the largest sizes these species can reach. As a response variable, the biomass of the trees was obtained through destructive sampling of 4 754 trees during wood harvesting. We used a stepwise multiple regression analysis with backward elimination procedure to develop models separately predicting, total biomass of the trees, stem biomass, and biomass of branches and twigs. All species- specific regression models relating biomass with measured tree dimen- sions were highly significant （p 〈 0.001）. The biomass of branches and twigs was less predictable compared to stem biomass and total biomass, although their models required fewer predictors and predictor interac- tions. The best-fit equations for total above-ground biomass and stem biomass bad R2 〉 0.70, except for the Acacia species; for branches including twig biomass, R2-values varied from 0.749 for Anogeissus leiocarpa to 0.183 for Acacia macrostachya. The use of these equations in estimating available biomass will avoid destructive sampling, and aid in planning for sustainable use of these species.

关键词： allometry above-ground biomass indigenous woody species linear regression site specific equation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Agroforestry Trees Improve Water Infiltrability in Semi-arid Tropical Parklands in Burkina Faso

引用

Journal of Agricultural Science and Technology(A) 2018年第5期8卷 262-273页

作者： Zomboudré Georges Ilstedt Ulrik Gnankambary Zacharia Nyberg Gert SoméLéopold guinko sita Malmer Anders Department of Natural Resource Management Institute for Environment and Agricultural Research(INERA)04 BP 8645 Ouagadougou 04Burkina Faso Department of Forest Ecology and Management Swedish University of Agricultural SciencesSE-901 83Umea Sweden Laboratory of Biology and Plant Ecology University of Ouagadougou03 BP 7021 Ouagadougou 03Burkina Faso

Maintaining appropriate levels of soil infiltrability is important for avoiding undesirable levels of surface runoff and erosion and for maintaining adequate rates of soil and groundwater *** study was conducted with the aim of investigating the effects of Faidherbia albida(apple-ring acacia)and Vitellaria paradoxa(shea butter tree)trees and additions of inorganic fertilizer,leaves and compost on soil infiltrability in two agroforestry parkland systems in the western part of Burkina *** was measured before tilling both under and outside canopies of these trees,using tension disc and double-ring *** results show that infiltrability was 33%higher on average under than outside canopies in both agroforestry parkland *** compost,leaves and inorganic fertilizer did not improve infiltrability significantly during the study *** than 75%of the infiltrability estimates obtained using ring infiltrometers outside the canopies were lower than 40 mm/*** contrast,less than 10%of those obtained from under canopies were lower than *** could have highly significant effects on run-off,erosion and recharge since rain intensity measurements collected over three years at 30 min intervals showed that up to 35%of the annual precipitation fell with intensities≥40 mm/*** study demonstrates the potential of improving infiltrability and reducing surface runoff by managing trees appropriately in agroforestry systems in semi-arid tropics.

关键词： Agroforestry infiltrability semi-arid rainfall intensity Faidherbia albida Vitellaria paradoxa

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：