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Tree Species Composition and Diversity in the riparian forest of Lake Barombi Kotto, Cameroon

American Journal of Plant Sciences 2021年第1期12卷 127-145页

作者： Awo Miranda Egbe Pascal Tabi Tabot Fonge Beatrice Ambo Department of Plant Science University of Buea Buea Cameroon Department of Agriculture Higher Technical Teachers’ Training College Kumba University of Buea Buea Cameroon

Tree species composition and diversity were investigated in the riparian forest around Lake Barombi Kotto, Cameroon. This study aimed at determining the tree species composition, population structure, and providing evidence of anthropogenic disturbances in the riparian forest of Lake Barombi Kotto. The objectives were to determine the tree species composition and diversity in the riparian forest around Lake Barombi Kotto, to elucidate the forest structure and to document the anthropogenic disturbances in this forest. Five plots were laid within which the tree enumeration and measurement of dbh were carried out. Trees were identified using scientific identification keys in the Flora of West Africa. Disturbance scores were given to each site by qualitatively assessing various disturbances. A total of 340 trees belonging to 70 plant species, 63 genera and 28 plant families were enumerated. Shannon-Wiener diversity varied across sites, with the highest value (H = 3.45) recorded in Tung and the lowest (H = 2.21) in Malenda. Population structure differed across sites, the largest stand basal area of 43.78 m2/ha was recorded in Bondokombo while the smallest (2.15 m2/ha) was recorded in the Sacred Island. Cecropia

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Installation of a riparian forest by Means of Soil Bio Engineering Techniques—Monitoring Results from a River Restoration Work in Southern Brazil

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Open Journal of forestry 2014年第2期4卷 161-169页

作者： Hans Peter Rauch Fabricio Sutili Stephan Horbinger Department for Civil Engineering and Natural Hazards University of Natural Resources and Life SciencesInstitute of Soil Bioengineering and Landscape ConstructionViennaAustria Departamento de Ciencias Florestais Universidade Federal de Santa MariaSanta MariaBrazil

Soil bioengineering has been applied more and more in different regions of Brazil in recent years. The study in hand presents the installation of “new” riparian forest based on soil bioengineering techniques. This riverbank restoration work was implemented in the year 2010 and two onsite vegetation surveys, one shortly after the construction, and one in 2013. Besides that, the structures of reinforcement work, and its effectiveness were evaluated. By means of the vegetation survey, the applied species were examined for their ability to establish the riverbank in an environmentally sustainable way. Most notably, the species Calliandra brevipes Benth. (Fabaceae, Mimosoideae), Phyllanthus sellowianus Müller Arg. (Euphorbiaceae), Salix humboldtiana Willd. (Salicaceae), Bauhinia forficate Link (Leguminosae), Inga marginata Willd. (Mimosoideae) and Ateleia glazioveana Baill. (Leguminosae, Papilionoideae) showed a good growth development. The proportion of spontaneous vegetation increased significantly, with Pennisetum purpureum Schumach. becoming a dominating species. Resulting from that, the intervention can be assessed as functional and safe, but the strong increase of spontaneous vegetation is undesirable due to less flood resistance. The vegetated riprap could be the best to meet the expectations of the construction elements. Partly, the anchored willows showed as well a good growth development whereas the species used for the hedge brush layer could not develop as expected in large parts of the construction.

关键词： Soil Bioengineering Riverbank Restoration riparian forest Rio Grande do Sul

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Tree mortality and regeneration of Euphrates poplar riparian forests along the Tarim River,Northwest China

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forest Ecosystems 2021年第4期8卷 659-671页

作者： Ayjamal Keram Umut Halik Tayierjiang Aishan Maierdang Keyimu Kadeliya Jiapaer Guolei Li College of Resources and Environmental Science Key Laboratory for Oasis Ecology of Ministry of EducationXinjiang UniversityÜrümqi 830046China College of forestry Key Laboratory for Silviculture and Conservation of Ministry of EducationBeijing Forestry UniversityBeijing 100083China State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

Background:Tree mortality and regeneration(seedling and sapling recruitment)are essential components of forest dynamics in arid regions,especially where subjected to serious eco-hydrological *** recent decades,the mortality of the Euphrates poplar(Populus euphratica)along the Tarim River in Northwest China has ***,few studies have quantified the causes of mortality and regeneration in this azonal riparian forest ***:The present study describes the annual hydrological response of tree mortality and regeneration in forest gaps.A total of 60 canopy gaps were investigated in six replicate grid plots(50m×50 m)and the annual runoff and water consumption data during the period of 1955–2016 were collected from hydrological stations in the middle reaches of the Tarim *** compared the regeneration density of seedlings and saplings within the canopy gap areas(CGAs),undercanopy areas(UCAs),and uncovered riverbank areas(RBAs)through detailed field ***:Our study found that the mortality of young and middle-aged gap makers has increased remarkably over recent decades,particularly since the year *** main results indicated that regional water scarcity was the primary limiting factor for long-term changes in tree mortality,as shown by a significant correlation between the diameter at breast height(DBH)of dead trees and the annual surface *** average density(or regeneration rate)of seedlings and saplings was highest in the RBAs,intermediate in the CGAs,and lowest in the *** with the UCAs,the CGAs promote tree regeneration to some extent by providing favorable conditions for the survival and growth of seedlings and saplings,which would otherwise be suppressed in the ***,although the density of seedlings and saplings in the CGAs was not as high as in the RBAs,the survival rate was higher in the CGAs than in the ***:forest canopy gaps in floodplain areas can play a decisive role in t

关键词： Tree mortality Regeneration strategy Seedling and sapling recruitment Gap makers riparian forest Tarim River

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Comparable water use of two contrasting riparian forests in the lower Heihe River basin, Northwest China

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Journal of forestry Research 2018年第5期29卷 1215-1224页

作者： Tengfei Yu Qi Feng Jianhua Si Xiaoyou Zhang Haiyang Xi Chunyan Zhao Alxa Desert Eco-hydrology Experimental Research Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences Lanzhou 730000 China Key Laboratory of Eco-hydrology of Inland River Basin Chinese Academy of Sciences Lanzhou 730000 China Gansu Hydrology and Water Resources Engineering Research Center Lanzhou 730000 China

Understanding forest ecosystem evapotranspiration（ET） is crucial for water-limited environments,particularly those that lack adequate quantified data such as the lower Heihe River basin of northwest China which is primarily dominated by Tamarix ramosissima *** Populus euphratica ***,we selected the growing season for 2 years （2012 and 2014） of two such forests under similar meteorological conditions to compare ET using the eddy covariance（EC） *** the growing seasons,daily ET of *** ranged from 0.3 to 8.0 mm day^（-1） with a mean of 3.6 mm day^（-1）,and daily ET of *** ranged from 0.9 to 7.9 mm day^（-1） with a mean of 4.6 mm day^（-1） for a total of 548 and 707 mm,*** significantly higher ET of the *** stand was directly linked to high soil evaporation rates under sufficient water availability from *** the soil evaporation was disregarded,water use was comparable to two contrasting riparian forests,a *** forest with a total transpiration of 465 mm and a *** forest with 473 *** analysis demonstrated that climate factors accounted for at least 80% of ET variation in both forest *** conclusion,water use of the riparian forests was low and comparable in this arid region,that suggest the long-term plant adaptation to the local climate and conditions of water availability.

关键词： Eddy covariance Evapotranspiration Heihe River basin riparian forest

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Assessment of impact of water diversion projects on ecological water uses in arid region

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Water Science and Engineering 2013年第2期6卷 119-130页

作者： Song-hao SHANG Hui-jie WANG State Key Laboratory of Hydroscience and Engineering Tsinghua University Yellow River Engineering Consulting Co. Ltd.

In arid regions, large-scale water diversion from rivers leads to significant changes in river flow regimes, which may have large impacts on ecological water uses of river-dependent ecosystems, such as river, lake, wetland, and riparian ecosystems. To assess the integrated impact of water diversion on ecological water uses, we proposed a hierarchy evaluation model composed of four layers representing the evaluation goal, sub-areas of the influenced region, evaluation criteria, and water diversion schemes, respectively. The evaluation criteria for different types of ecological water uses were proposed, and the analytical hierarchy process was used for the integrated assessment. For a river ecosystem, the percentage of mean annual flow was used to define the grade of environmental flow. For a lake ecosystem, water recharge to the lake to compensate the lake water losses was used to assess the ecological water use of a lake. The flooding level of the wetland and the groundwater level in the riparian plain were used to assess the wetland and riparian ecological water uses, respectively. The proposed model was applied to a basin in northern Xinjiang in northwest China, where both water diversion and inter-basin water transfer projects were planned to be carried out. Based on assessment results for the whole study area and two sub-areas, an appropriate scheme was recommended from four planning schemes. With the recommended scheme, ecological water uses of the influenced ecosystems can be maintained at an acceptable level. Meanwhile, economical water requirements can be met to a great extent.

关键词： arid region water diversion project environmental impact assessment ecological water use environmental flow riparian forest analytic hierarchy process

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Microcoring and dendrometer-detected intra-annual wood formation of Populus euphratica in the Ejina Oasis,northwestern China

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Research in Cold and Arid Regions 2017年第1期9卷 54-66页

作者： XiaoMei Peng ShengChun Xiao GuoDong Cheng QuanYan Tian HongLang Xiao Key Laboratory ofEcohydrology of Inland River Basin Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China University of the Chinese Academy of Sciences Beijing 100049China

Seasonal stem radial growth and wood formation of trees have become research hotspots because of their significance for dendroclimatological and dendroecological studies. However, until recently, these studies concentrated on coniferous tree species in high-altitude and high-latitude regions,while detailed information on arid-zone riparian forests is scarce. The main focus of this study is to monitor the intra-annual dynamics of radial growth and tree ring formation in a deciduous species, Populus euphratica. In 2013, we combined the dendrometer and microcoring methods to study this species in the riparian forest of the Ejina Oasis, in arid northwestern China. Vessel enlargement began in early May, and the maximum rate of cell production occurred in early June. The cell division then ceased from early to mid-July. The dendrometer method failed to reliably detect the date of growth initiation and cessation, but succeeded to detect the time of maximum growth rate just like the microcoring method did. We found that weekly stem radial increment data described xylem growth more accurately than daily datasets. Based on correlation analysis among climatic and hydrologic variables, and weekly stem radial increment, weekly ring width increase dataset, the depth to groundwater was the main factor that limited tree ring growth. From a practical perspective, such studies of intra-annual wood formation can provide empirical guidance for seasonal water allocations within a river basin.

关键词： stem radial growth xylem growth climate groundwater depth riparian forest Heihe River northwestern China

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Trees and Shrubs of Zerafshan State National Reserve, Uzbekistan

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American Journal of Plant Sciences 2020年第11期11卷 1698-1705页

作者： Muqaddas Kholbutayeva Hislat Haydarov Flora Kabulova Husniobod Akhmedova Jizzakh State Pedagogical Institute Jizzax Uzbekistan Samarkand State University Samarkand Uzbekistan

The riparian (tugai) forest ecosystems of Central Asia are a biodiversity hotspot with unique many trees and shrubs. Intense human pressure and global warming have caused habitat destruction in Zerafshan State National park and it’s 23.5 ha. There grow more than 300 higher plants. We analysed the wild flora and the remains of the species diversity that previously existed on the site of the forestry enterprise, the modern biodiversity of trees and shrubs in the described territory are represented by 52 species from among representatives of 21 plant families. These monitoring and results indicated that some tree species might in the near future become extinct in the wild. We therefore recommend that the local people be encouraged to stop using these trees.

关键词： riparian forest Tugai Ecosystem Monitoring Human Pressure Trees

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