吸烟会使皮肤渐渐丧失养分和富氧能力，从而导致吸烟者的面色暗淡，某些还
Smoking chronically deprives the skin of oxygen and nutrients. So
异质养分环境中的根系具有较高的养分吸收效率主要缘由在富养斑块中对N、P、K大量的吸收。
Higher efficiency of nutrient acquisition of root in heterogeneous nutrient environment mainly attributed to large absorption of n, p, K in rich nutrient patch.
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