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基于侵蚀过程会导致树木生长环境变化,进而改变根系生长生理特征的基本研究思想,以金沙江干热河谷龙川江流域为典型区,从树根细胞解剖结构和组合特征的变异中提取土壤侵蚀信息,探索和发展了基于树木生理生态的土壤侵蚀研究新方法与技术。结果表明,不同侵蚀强度下根系的年轮分布特征不一致,其中偏心率大小顺序为:局部暴露根系>浅埋根系>完全暴露根系,且偏心率与根系以上土层厚度、暴露程度存在显著性相关;根系导管面积是反演侵蚀过程的敏感指标,早材导管面积的变异是确定根系暴露时间的重要依据之一;龙川江流域土壤流失厚度为1.47~4.47 mm/a,平均侵蚀模数约为3 692 t(/km2.a)。
Based on the basic research idea that the erosion process will lead to the changes of the growth environment of trees and then to the physiological characteristics of root growth, soil erosion information is extracted from the variations of the anatomical structure and combining characteristics of the root cells in a typical area of the Longchuanjiang River valley in the Jinsha River dry-hot valley. Explore and develop new methods and techniques of soil erosion research based on the tree ecophysiology. The results showed that the characteristics of annual rings distribution were different under different erosion intensities. The order of eccentricity was local exposed roots> shallow buried roots> completely exposed roots, and there was a significant correlation between eccentricity and soil thickness and exposure above root The root canal area is a sensitive index for the inversion of erosion process. The variation of early timber conduit area is an important basis for determining the root exposure time. The soil erosion thickness of Longchuanjiang River basin is 1.47-4.47 mm / a, and the average erosion modulus is about 3 692 t (/km2.a).