杨树栽植初期体内水分含量变化与大斑型溃疡病关系的研究

Study on the Relationship between Changes of Water in Stem and Incidence of Canker Disease during the Early Stage of the Planted Poplars

由Dothiorella gregaria Sacc.引起的杨树大斑型溃疡病是辽宁、河北、山西等地区杨树上的重要病害。近几年我们对该病的防治措施进行了研究,发现用截头法种植杨树,对减轻发病程度,提高造林成活率及生长量均有显著作用。在研究这种栽培技术的防病原理过程中,我们首先对树体内各部位水分的变化与发病的关系进行了探讨。

In the early stage of the planted Poplars, the changes of relative water content in cortex, xylem or trunk are different. For the cutting top Poplars and the checks, the change of relative water content in xylem is the biggest, and that in the cortex the smallest. Before the spread of the leaves, the main water loss is due to the trunk transpiration. The surface of the cutting top Poplar is smaller than that of the check, so the water loss in the treated Poplar is less than that of the check. This is one of of main reasons why the incidence of the Poplar canker disease was reduced in the cutting top Poplar plantation.