New directions in community and farm reforestation
Increased emphasis on environment, increased faith in private sector forests rather than government‐owned plantations, and improved techniques for tree growing have led to changes in reforestation policies, particularly in timber‐importing countries. Farm and community forestry has become more important, and often involves mixed broadleaved species and selective logging rather than clearfell. Private profitability is often low, but social returns may be considerably greater, warranting government support. While governments have experimented with a variety of instruments to encourage reforestation, policies have not necessarily addressed the main impediments. Measures to increase the share of resource rent gained by tree growers relative to other stakeholders in the timber production pipeline could accelerate plantings.
Community forests in Canada: An overview
A great deal of attention is being given in Canada at present to the idea of community forest. This is occurring at a time of unprecedented attention to forest management on one hand, and to community empowerment on the other. We conceive of a community forest as a tree-dominated ecosystem managed for multiple community values and benefits by the community.We review the literature and present examples of community forests in Europe and the United States. For Canada, we present an overview of community forest initiatives, policy developments, and research projects. For communities contemplating the concept of community forest, we present a series of considerations that need to be made early on: (a) landbase; (b) range of resources involved; (c) property rights and tenure options; (d) models of administration; (e) decision-making; (f) public participation; and (g) financing.The apparent growing interest in community forests in Canada has opened an exciting and challenging frontier for forest interests. We a...
An Ultrasensitive Analytical Method Based on Chemiluminescence Sensing Electrochemical Parallel Catalytic Reaction Event
An ultrasensitive electrochemiluminescence (ECL) method on the combination of electrochemical parallel catalytic reaction and chemiluminesence signal sensing was proposed for improving ECL analytical characteristics using vanadate(V) as a representative. Vanadate(V) could be electrochemically reduced to generate vanadate(II) which could be chemically oxidized by potassium periodate to regenerate vanadate(V) and give parallel catalytic wave effect. Then, the reduced product of potassium periodate could react with butyl-rhodamine B to emit a sensitive chemiluminescence signal. The chemiluminescence intensity was correlative with vanadate(V) concentration. The investigation on the electrochemical reaction rate constant (k0) confirmed that the speed of electrochemical reaction was faster than that of the subsequent chemiluminescence reaction. The possibility of the combination of electrochemical parallel catalytic reaction with chemiluminescence signal sensing was proved. The similar ECL behaviors could be observed at zirconia nanowires-Nafion modified electrode. Because of the separation and enrichment effect of the modified electrode on vanadate(V), the selectivity and sensitivity was further improved greatly. Based on these findings, a new concept on the combination of electrochemical parallel catalytic reaction and chemiluminesence signal sensing was proposed and an ultrasensitive ECL method for the determination of vanadate(V) was developed at zirconia nanowires-Nafion modified electrode. Under the optimum experimental conditions, the ECL intensity was linear with the concentration of vanadate(V) in the range of 2.0×10−12 mol/L–2.0×10−10 mol/L. The detection limit was 8.0×10−13 mol/L, which was more than 6 orders of magnitude lower than that observed by electrochemical current transduction for electrochemical parallel catalytic reaction at zirconia nanowires-Nafion modified electrode.