片断化的森林，林地面积减少，边缘地带面积的比例增加。
Forest fragmentation results in the reduce of central forest area and the increase of forest edges.
结果表明，影响最大的参数为温室覆盖材料对太阳辐射和热辐射的透射率以及作物占温室土壤表面积的比例。
The results show that the solar and thermal infrared transmittance of the cover and the proportion of soil surface occupied by vegeta (?) appear as the most influential parameters.
长江流域的自然保护区占全流域面积的5． 74％，比我国自然保护区占国土面积的比例低1．9个百分点。
The nature reserves cover 5. 74 % of the total area in the Yangtze Basin, which is 1. 9 % lower than the overall mean rate in China.
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