Cutting a tree down to its base ensures the tree remains alive and smaller shoots can quickly grow for harvesting. Coppicing is the practice of cutting trees and shrubs to ground level, promoting vigorous re - growth and a sustainable supply of wood for future generations. This means new trees don't need to be planted. Coppicing involves cutting down trees in a way that lets them grow back. b) two types of coppicing: coppicing and rotational coppicing. c) it may not involve the prevention of human access or interference.ġ1) a) sustainable timber production methods for small - scale timber production: coppicing and pollarding. b) it may involve active management in the ecosystem. d) a sustainable technique may be conservation rather than preservation because: a) the technique involves sustainable development. Preservation: doesn't involve sustainable development. Preservation: protection of an ecosystem from human interference, so that it remains in its original state. Conservation: involves sustainable development. c) conservation: active management of an ecosystem. We have a moral duty for future generations to conserve the wide variety of existing ecosystems. Ethical: many believe that we shouldn't have the right to decide which organisms live or die. Social: many enjoy the natural beauty of wild ecosystems as well as using them for activities which are beneficial to health by providing a means of relaxation and exercise. Eg, rainforest species provide medicinal drugs, so they must be conserved. b) economic: to provide resources that humans need to survive and to provide income. More prey organisms survive and reproduce, increasing the prey population, causing the cycle to start again.ĩ) a) economic, ethical and social. d) the second incline of the prey curve: reduced predator numbers results in less of the prey population being killed. Interspecific competition between different species of predator that feed on the same prey increases, resulting in a decrease in the size of the predator population. c) the first decline of the predator curve: the reduced prey population can no longer support the predator population. The death rate of the prey population is greater than its birth rate, so the prey population falls. b) the first decline of the prey curve: the increased predator population eats more prey, causing a decline in the prey population. This, in turn, results in an increase in the predator population. b) a) the first incline of the predator curve: an increase in prey population provides more food for the predators, allowing more to survive and reproduce. 2) a) predator populations are always smaller than prey populations.
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