CHAPTER SUMMARIES
(1) 自然界的生態平衡是如何展現呢？人類的活動又如何破壞生態平衡？
(2) 人類和自然的關係應該如何平衡？
Human should not interfere with any of the relation between life and the earth. (F)
Which factor enables sage to survive the long ages of natural selection in the dry West? Its small grey leaves can hold moisture.
Grouse, Mule deer, Antelope depend on the sage
Land management agencies decide to eliminate the sage to satisfy the demand of grazing land
Immediate side effect of spraying on sagebrush, as illustrated in the example of Bridger National Forest : The willows were killed
Subsequent side effect : The beavers disappeared , the waterfowl disappeared, the lake drained away
Negative consequence of using sprays : The tourists made negative comments to the place
Functions of roadside vegetation : Providing food for birds, Pollinating insects, providing nesting area for birds
Selective spraying can achieve a long term control of tree growth based on fact that the shrubs are highly resistant to the invasion by trees
Advantages of selective spraying : The natural beauty is preserved. The effect of a single spraying can last longer. It reduces potential harm to wildlife.
The plants sprayed with “2, 4-D” (a herbicide) are dangerous for cattle because the cattle will suffer from the lack of oxygen
Roses grow better with marigolds than growing alone because an excretion released by marigolds kills nematodes in the soil.
The functions of plants which are considered as weeds : The weeds and the soil mutually benefit each other. The weeds indicate the condition of soil. To satisfy the need to preserve some plant communists.
After the spraying of “2,4-D”, the grasses have become “weeds” because there are less plants to compete with them. (T)
The reason that blanket spraying results in more ragweed : The chemicals kill the protective vegetation, making it easier for the weeds to invade
Without plants, we would not be able to live. Yet people tend to treat plants recklessly. If a plant is
(2) 人類和自然的關係應該如何平衡？
Human should not interfere with any of the relation between life and the earth. (F)
Which factor enables sage to survive the long ages of natural selection in the dry West? Its small grey leaves can hold moisture.
Grouse, Mule deer, Antelope depend on the sage
Land management agencies decide to eliminate the sage to satisfy the demand of grazing land
Immediate side effect of spraying on sagebrush, as illustrated in the example of Bridger National Forest : The willows were killed
Subsequent side effect : The beavers disappeared , the waterfowl disappeared, the lake drained away
Negative consequence of using sprays : The tourists made negative comments to the place
Functions of roadside vegetation : Providing food for birds, Pollinating insects, providing nesting area for birds
Selective spraying can achieve a long term control of tree growth based on fact that the shrubs are highly resistant to the invasion by trees
Advantages of selective spraying : The natural beauty is preserved. The effect of a single spraying can last longer. It reduces potential harm to wildlife.
The plants sprayed with “2, 4-D” (a herbicide) are dangerous for cattle because the cattle will suffer from the lack of oxygen
Roses grow better with marigolds than growing alone because an excretion released by marigolds kills nematodes in the soil.
The functions of plants which are considered as weeds : The weeds and the soil mutually benefit each other. The weeds indicate the condition of soil. To satisfy the need to preserve some plant communists.
After the spraying of “2,4-D”, the grasses have become “weeds” because there are less plants to compete with them. (T)
The reason that blanket spraying results in more ragweed : The chemicals kill the protective vegetation, making it easier for the weeds to invade
Without plants, we would not be able to live. Yet people tend to treat plants recklessly. If a plant is