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割胶和刺激增产都会使胶乳中的糖含量长期降低,因而在常规割胶的情况下,乳管中糖的供应就成为制约产量的因素。割胶之所以有降低糖分的作用,一方面是由于胶乳的形成要消耗糖,另一方面是由于糖的运输受到阻碍。很明显,割胶把韧皮组织割去后,同化物的运输就受到了阻碍,这种阻碍作用随着割线上方割去的树皮面积增大而加剧。化学刺激能加强胶乳的代谢作用,因此也促进糖朝着被刺激的组织运输。但促进运输的作用比因韧皮部被割去而发生的阻碍运输的作用小得
Both tapping and stimulation of production increase the sugar content of the latex for a long period of time, so in the case of conventional tapping, the supply of sugar in the milk tube becomes a factor that restricts production. The reason that there is a role to reduce the sugar tapping, on the one hand due to the formation of latex to consume sugar, on the other hand is hindered by the transport of sugar. Obviously, tapping the phloem tissue, the transport of the assimilate is hampered, and the impediment is exacerbated by an increase in the bark area cut off above the secant. Chemical stimulation enhances the metabolism of the latex and therefore also promotes the transport of sugar towards the stimulated tissue. However, the role of transport promotion is less than the obstruction of transport that occurs when the phloem is cut off