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获得具有最适叶面积生长图形的群体所需的若干条件叶面积达到每公顷4～5万平方米的、结构优良的群体应该吸收大量的太阳辐射能。可是即使在最好的情况下也有大部分的能(80～90%)变为热而引起强烈的蒸腾。近似的统计说明,形成优良的群体,要求供给为数达2,500～3,500立方米的水,以供群体吸收的1亿大卡能的蒸发之用。当群体不能得到这个数量的水分时,群体叶面积就发育得较小,吸收较少的能量,以与可能蒸发的水分相适应。由此可见,要获得结构优良的群体,供应它的水
Several conditions needed to obtain a population with the most suitable leaf area growth pattern A well-structured population with a leaf area of 4 to 50,000 square meters per hectare should absorb large amounts of solar radiant energy. But even in the best of circumstances, most of the energy (80-90%) turns into heat and causes strong transpiration. Approximate statistics show that good communities are formed, requiring a supply of up to 2,500 to 3,500 cubic meters of water for 100 million kcal absorbed by the community. When the population can not get this amount of water, the population develops a smaller leaf area that absorbs less energy to match the moisture that may evaporate. This shows that to get a good structure of the group, supply its water