藏东南巨柏根系结构特征与环境因子研究

Analysis of Effect Factors on the Root Architecture of Cupressus Gigantea(Southeast Tibet )

摘要:

巨柏(Cupressus gigantea)是西藏特有珍稀物种，在雅鲁藏布江中下游区域的生态环境保护中具有重要的作用.本研究以朗县巨柏居群为研究对象，采用相关性分析和主成分分析法探究了巨柏根系结构特征与不同地类环境因子之间的关系.数据结果表明：水线岸边、岩石裸露区的主要影响因子分别是石砾含量和岩石裂缝，河岸阶地与坡麓地根系结构的主要因子有土壤肥料、pH值、土壤容重和土壤自然含水量；巨柏生存的适生环境为砂质土壤，微碱性，土壤含水量适中；在巨柏苗木培育、人工移植的过程中，河岸阶地与坡麓地是选择巨柏迁地保护的理想地类，同时应充分考虑土壤肥力和理化性质带来的影响，提高迁地保护的成活率.

Abstract:

Cupressus Gigantea which is one of the endemic and rare species in Tibet, play an important role for ecological environment protection near Yarlung Tsangpo River Valley. This study was based on Cupressus Gigantea of Lang County by using the method of principal component analysis and correlation analysis to explore the relationship between root system and soil environment. The results showed that rock gravel content and rock fracture were the main factors on the shore line and rock hare area respectively; while the main factors of the root architeefure of the terraces and the foot slope were soil fertility, pH, volume weight and natural water content. According to the test, the suitable living environment for Cupressus Gigantea was sandy soil, slight alkali and moderate soil water content. The terraces and the foot slope are the ideal areas for exsitu conservation. At the same time, the effects of soil fertility and soil physical properties should be considerd to improve the survival rate of Cupressus Gigantea planting.