Every year, forest fires and severe storms cause a great deal of damage to forests in the northwestern United States. One way of dealing with the aftermath of these disasters is called salvage logging, which is the practice of removing dead trees from affected areas and using the wood for lumber, plywood, and other wood products. There are several reasons why salvage logging is beneficial both to a damaged forest and to the economy.
First, after a devastating fire, forests are choked with dead trees. If the trees are not removed, they will take years to decompose; in the meantime, no new trees can grow in the cramped spaces. Salvage logging, however, removes the remains of dead trees and makes room for fresh growth immediately, which is likely to help forest areas recover from the disaster.
Also, dead trees do more than just take up space. Decaying wood is a highly suitable habitat for insects such as the spruce bark beetle, which in large numbers can damage live, healthy spruce trees. So by removing rotting wood, salvage logging helps minimize the dangers of insect infestation, thus contributing to the health of the forest.
Third and last, salvage logging has economic benefits. Many industries depend upon the forests for their production, and because of this a fire can have a very harmful effect on the economy. Often, however, the trees that have been damaged by natural disasters still can provide much wood that is usable by industries. Furthermore, salvage logging requires more workers than traditional logging operations do, and so it helps create additional jobs for local residents.
Salvage logging may appear to be an effective way of helping forests recover after a destructive fire or storm, but it can actually result in serious longer-term environmental damage Its economic benefits are also questionable.
First, cleaning up a forest after a fire or storm does not necessarily create the right conditions for tree growth. In fact, the natural process of wood decomposition enriches the soil and makes it more suitable for future generations of tree. The rapid removal of dead trees can result in soil that lacks the nutrients necessary for growth.
Second, it's true that rotting wood can increase insect populations, but is this really bad for the forest? In fact, spruce bark beetles have lived in Alaskan forest for nearly a hundred years without causing major damage. And of course dead trees do not provide habitats only for harmful insects. They are also used by birds and other insects that are important contributors to the long-term health of forests. In the long run, therefore, salvage logging may end up-doing more harm to forests than harmful insects do.
And third, the economic benefits of salvage logging are small and do not last very long, in severely damaged forests, much of the lumber can be recovered only by using helicopters and other vehicles that are expensive to use and maintain. Furthermore, jobs created by salvage logging are only temporary and are often filled by outsiders with more experience or training than local residents have.
Main points: Salvage logging is beneficial for several reasons.
Sub point 1: Remove dead trees and allow new trees to grow.
Sub point 2: Dead trees allow insects to grow.
Sub point 3: Dead tree can be used in industries and good for economic.
Attitude: It can result in environmental damage and questionable economic benefits.
Sub Point 1: Clean up a forest is no good for tree growth. (Decomposition enrich soil.)
Sub Point 2: Insect is not really bad for forest. (Beetles lived without major damage, can be used by birds.)
Sub Point 3: Expensive to remove dead trees. (Jobs are temporary.)
The lecturer and the reading passage hold completely different views toward the practice of salvage logging, which is the removal of dead trees from a forest after a fire or storm.
以L的观点为主要观点，指出L和R对于salvage logging意见完全相反，然后补充一句salvage logging是说在火灾或者风暴后移除死树。
First, the lecturer states that removing dead trees is not good for the health of a forest because it deprives it of nutrients necessary for future tree growth, which dead trees release into the soil as they decompose. In contrast, the reading passage states that removing old trees provides more space in which new generations of fresh trees can grow uninhibited by deadfall.
Second, the lecturer argues that some insects and birds that inhabit dead trees are beneficial for tree growth. Some others that are thought to be harmful have shown no evidence of causing significant damage to the forest. By eliminating both harmful and beneficial birds and insects, salvage logging may cause unwanted damage to the forest in the long run. The reading, however, mentions only harmful insects, the spruce bark beetle in particular. It points out that because clearing the forest of dead trees also destroys the habitat of these harmful insects, it ensures the healthy recovery of a forest after fires.
Finally with regard to economic impact, the lecturer argues against salvage logging because the dead trees can only be salvaged at a very high cost. Additionally, the employment opportunities associated with salvage logging are often temporary and are typically performed by non-native residents. On the other hand, the reading argues that this practice provides many industries with the wood necessary to sustain production and even offers employment opportunities to local people.
1. The lecturer and the reading passage hold completely different views toward(某政策), which is the (进一步解释政策).
2. The reading, however, mentions only…(观点和证据)
3. On the other hand (如何在段落中转折)