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笔者的榕树、七叶树、橡皮树等,每到阴雨连连的梅雨季节便会长出许多白色的气根,但好景不长,雨过天晴后,这些气根就很快干瘪死亡。后来在海南、云南等地看到独木成林的大榕树以及行道树上挂满了垂柳一样的气根,灵光一闪:提高空气湿度不就可以培养裸根(通常是用培土法培养裸根,但不能用于气根)了吗?为此,我试用了两种保湿法:一是用黑色塑料薄膜包裹,但毛细根太多,影响主根的生长;二是用硬质透明塑料套根,效果较好。具体做法是,当气根长出2～3厘米时,将卷扎好的硬质透明塑料筒把气根套上,下部埋入土中,再将浸透清水的纱布条,装入塑料筒内,上边露出一点,以防滑落。纱布非常保水,不必经常喷水,筒内空气湿度保持在80%以上。这种硬质透明塑料的好处是:1.可随时观察气根生长情况,入土后即可解套;2.质地硬,不会因碰撞、大风等原因损伤气根;3.因根有背日性、向水性,在透光的情况下,不生或少生毛细根。
The author’s banyan tree, horse chestnut, rubber tree, rainy season, every rainy season will grow many white roots, but the good weather is not long, after the storm, these roots quickly died of deflated. Later, in Hainan, Yunnan and other places to see single-tree forest banyan trees and trees covered with the same weeping willow, a flash of Emmanuel: to improve the air humidity can not cultivate bare roots (usually cultivated by soil culture bare root , But can not be used for air root) yet? For this reason, I tried two kinds of moisturizing method: First, wrapped with black plastic film, but the capillary root too much, affecting the growth of the main root; Second, The effect is better. Specifically, when the air root grows 2 to 3 cm, the roll of rigid transparent plastic tube to the root of gas sets, buried in the lower part of the soil, and then soaked gauze, into the plastic tube, Above exposed a little to prevent slipping. Gauze is very water-conserving, do not often have to spray water, keep the air humidity in the barrel above 80%. The benefits of this rigid transparent plastic are: 1. Observed at any time the growth of gas roots, soil can be set after release; 2. Texture hard, not because of collisions, winds and other reasons damage the roots; 3. Roots and backs On the nature, to the water, in the case of light, no or less raw hairy roots.