Equitable distribution of benefits in social forestry and agroforestry     

R. J. Fisher 《Agroforestry Systems》1990,11(3):281-286

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森林经营中的地方分权和权力下放     

Fisher R.J  胡延杰 《林业与社会》2002,(2):26-28

一、引言 地方分权和权力下放，以及一系列相关的术语(如参与和权力)目前已被广泛用于有关林业政策的讨论中。但是这些术语过去常常被用来描述森林经营的各种方法和过程，并且常被错误地互换。本文的目的是界定这些术语和概念的含义；总结这些概念在实践中的应用方式，并依据已有的经验来指导将地方分权和权力下放这些概念应用于今后的森林经营实践。 二、定义和概念 地方分权和权力下放这两个术语常被互换，但区分二者之间的差别很重要。地方分权可以定义为：将地方的管理职能在当地进行重新分配，这并不一定意味着决策中心的改变或权力的…  相似文献   

Forest Ecology and Management 200 Volumes     

R.F. Fisher  G.M.J. Mohren 《Forest Ecology and Management》2004,200(1-3):1

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Forest soils education and research: Trends, needs, and wild ideas     

R.F. Fisher  T.R. Fox  R.B. Harrison  T. Terry 《Forest Ecology and Management》2005,220(1-3):1-16

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Agroforestry systems in North America   总被引：2，自引：0，他引：2  

T. H. Bandolin  R. F. Fisher 《Agroforestry Systems》1991,16(2):95-118

Agroforestry systems in North America vary widely in terms of components (tree, forb, graminoid, and shrub species) and outputs. Most of the agroforestry systems used in North America have emphasized wood and livestock production. The objective of each system has been to produce annual and long term economic returns and sustainable yields. Inputs such as fossil fuels, fertilizers, herbicides and pesticides are relatively low compared to those used in conventional agriculture.Major agroforestry system types in each of eight North American regions are described. The major species used as vegetational components in each system are enumerated by region. The numerous variations in how these components are mixed have created an almost endless number of actual systems. Management problems and solutions, economic concerns, and system comparisons have also been addressed for each region.  相似文献   

Effect of Scleroderma Spore Density and Age on Mycorrhiza Formation and Growth of Containerized Eucalyptus globulus and E. urophylla Seedlings     

Ying Long Chen  Bernard Dell  Nicholas Malajczuk 《New Forests》2006,31(3):453-467

Greenhouse trials with containerized Eucalyptus globulus and E. urophylla seedlings were made to determine effective inoculum spore densities (Scleroderma cepa from temperate Australia, and S. citrinum from sub-tropical China) and spore storage conditions (fresh spores or spores stored for 5 years at room temperature or at 4 °C; S. albidum, S. areolatum and S. cepa from Western Australia). Inoculation with 10⁶ or 10⁸ spores/seedling increased eucalypt growth by up to 46% in height and 42% in dry weight compared to non-inoculated seedlings at 12 weeks after inoculation. Mycorrhizal formation was poor at 10² spores/seeding. Spores stored at 4 °C for 5 years were as effective in forming mycorrhizas as freshly collected spores when a standard density of 10⁶ spores/seedling was applied. It is recommended that spore densities ≥10⁴ be used for inoculation of containerised eucalypts and that spores be stored at 4 °C until use.  相似文献   

Hydraulic conductivity and embolism in the mangrove tree Laguncularia racemosa     

Ewers FW  Lopez-Portillo J  Angeles G  Fisher JB 《Tree physiology》2004,24(9):1057-1062

We measured xylem pressure potentials, soil osmotic potentials, hydraulic conductivity and percent loss of conductivity (PLC) due to embolism, and made microscopic observations of perfused dye in the white mangrove tree, Laguncularia racemosa (L.) Gaertn. f., (1) to determine its vulnerability to air embolism compared with published results for the highly salt-tolerant red mangrove tree, Rhizophora mangle L., and (2) to identify possible relationships between air embolism, permanent blockage of vessels and stem diameter. Laguncularia racemosa was more vulnerable to embolism than reported for R. mangle, with 50 PLC at -3.4 MPa. Narrow stems (5-mm diameter) had higher PLC than larger stems (8.4- or 14-mm diameter) of the same plants. Basic fuchsin dye indicated that up to 89% of the vessels, especially in the narrow stems, had permanent blockage that could not be reversed by high pressure perfusion. Air embolism could lead to permanent vessel blockage and eventual stem mortality. Such vulnerability to embolism may restrict the growth of L. racemosa and limit its distribution to less salty areas of mangrove communities.  相似文献   

Effectiveness of Protected Area Governance in the Conservation of Mt. Marsabit Forest Ecosystem,Kenya     

Ouko Achieng  Mulwa Richard  Kibugi Robert  Oguge Nicholas 《Journal of Sustainable Forestry》2020,39(5):477-493

ABSTRACT

Protected area systems (PAs) have the potential to conserve natural resources and provide social and economic benefits to local communities. Establishing and maintaining good governance and associated mechanisms is necessary for adaptive management of PAs. To test this hypothesis, we analyzed the relationships between various stakeholders and the effectiveness of PA governance of Mt. Marsabit forest ecosystem in Kenya. We used social network analysis (SNA) to assess the interactions between actors, and factor analysis to analyze the effectiveness of governance criteria. Governance of Mt. Marsabit forest ecosystem was complex with a multiplicity of stakeholders from diverse interests. Governance was moderately effective (61%) with positive indicators including the regulatory framework, delineation of areas under conservation, and reduction in poaching. The low level of interactions and associations among stakeholders suggest a weakness in the networks that may negatively affect the flow of information and other resources. This weakness was attributed to a lack of institutionalization of the links leading to poor coordination of processes. Local communities were inadequately represented in the governance of this PA despite being important actors. Our study finds that local ownership and strong linkages between actors are important ingredients for effective governance of PAs.  相似文献   

EARLY POSTOPERATIVE MAGNETIC RESONANCE IMAGING FINDINGS IN FIVE DOGS WITH CONFIRMED AND SUSPECTED BRAIN TUMORS          下载免费PDF全文

Kathleen Ella Chow  Dayle Tyrrell  Sam Nicholas Long 《Veterinary radiology & ultrasound》2015,56(5):531-539

Early postoperative neuroimaging has been performed in people for over 20 years to detect residual brain tumor tissue and surgical complications. The purpose of this retrospective study was to describe characteristics observed using early postoperative magnetic resonance imaging in a group of dogs undergoing craniotomy for brain tumor removal. Two independent observers came to a consensus opinion for presence/absence of the following MRI characteristics: residual tumor tissue; hemorrhage and ischemic lesions; abnormal enhancement (including the margins of the resection cavity, choroid plexus, meninges) and signal intensity changes on diffusion‐weighted imaging. Five dogs were included in the study, having had preoperative and early postoperative MRI acquired within four days after surgery. The most commonly observed characteristics were abnormal meningeal enhancement, linear enhancement at margins of the resection cavity, hemorrhage, and a thin rim of hyperintensity surrounding the resection cavity on diffusion‐weighted imaging. Residual tumor tissue was detected in one case of an enhancing tumor and in one case of a tumor containing areas of hemorrhage preoperatively. Residual tumor tissue was suspected but could not be confirmed when tumors were nonenhancing. Findings supported the use of early postoperative MRI as a method for detecting residual brain tumor tissue in dogs.  相似文献   

The increasing risk of Lyme disease in Canada     

Catherine Bouchard  Erin Leonard  Jules Konan Koffi  Yann Pelcat  Andrew Peregrine  Neil Chilton  Kateryn Rochon  Tim Lysyk  L. Robbin Lindsay  Nicholas Hume Ogden 《The Canadian veterinary journal. La revue veterinaire canadienne》2015,56(7):693-699

There is an increasing risk of Lyme disease in Canada due to range expansion of the tick vector, Ixodes scapularis. The objectives of this article are to i) raise public awareness with the help of veterinarians on the emerging and expanding risk of Lyme disease across Canada, ii) review the key clinical features of Lyme disease in dogs, and iii) provide recommendations for veterinarians on the management of Lyme disease in dogs.  相似文献