图解降真香香格的产生过程。⋯降真香的藤质导管多而密,其作用是输送营养,当受外界伤害时,比如闪电、大风、虫害侵袭了植物的肌体,为了抵抗疾病及死亡威胁,出于本能,其神经系统便会发出信号,自行分泌出异常稠厚的红褐色“体液”–树脂,缓缓沉积于伤口上,堵住其受感染的导管或树身病变的部位,进行自我修复疗伤,当树脂充满导管后,导管也丧失了输送养分的功能,其部位颜色变黑,密度变大,从而成了一块香格。因降真香分泌的树脂性味甘甜,所以很容易吸引蚁虫或真菌寄生于心材,进而产生共生变化,更因虫蚁菌种及其他因素影响不同,使香格从而产生各种香型。当然,降真香结香要求非常高,即使在同个山头,南面比北面结香多很多,它们只在特定的纬度,海拔,气候,土壤等条件下,甚至特定的地域才结香,一般在北纬19度至21度之间,而且大部分在海南南部及缅甸中部。 从降真香的结香原理来看,降真香的结香方式和沉香是一样,不同点是,沉香是木本结香,降真香属藤本结香。古代的古沉香有十五种,降真香是其中之一,在东南亚,降真香还一直沿用着藤沉香的名称。![](https://imgsa.baidu.com/forum/w%3D580/sign=3a61ff904ded2e73fce98624b701a16d/e9673d1001e939012d249d2a7cec54e736d1963a.jpg)
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