论文部分内容阅读
掘出（２．４ｍ）２，（１．２ｍ）２（０．６ｍ）２和（０．３ｍ）２四种栽植距离、嫁接于Ｍ９砧上的五年生金帅苹果，发现在较大的栽植距离下，根系是由水平的大根与少数垂直的次生吸收根构成，但在较小的栽植距离下，则以垂直的次生吸收根为主。与毗邻根系的交混程度随栽植密度的增大而增大。随栽植密度的增加，根系重量、长度、体积与表面面积则减少，但土中根系的密度增加。根与校梢的比率，不受栽植距离的影响。直径小于２ｍｍ的根，很少有助于根系重量和体积的增加，但对于长度和表面面积的增加是有利的。栽植距离影响根系的分布和深度，在栽植距离较小的情况下，根重的２５％在土层 ５０ｃｍ以下，但在较大栽植距离的情况下，只有１５％在土层５０ｃｍ以下。在所有各种深度中，根的密度随栽植距离的减小而增大、深度不同，细根（直径＜２ｍｍ）和主根（直径＞２ ｍｍ）的分布比例不同，在所有不同栽植距离情况下，主根在土壤的上部２５ｃｍ处数量较多。
Excavated four (2.4m) 2, (1.2m) 2 (0.6m) 2 and (0.3m) 2 four planting distance, grafted on M9 anvil five-year-old handsome apple, found in the larger Under the planting distance, the root system consisted of a horizontal root and a few vertical secondary root, but under the smaller planting distance, the root was mainly vertical secondary root. The degree of confluence with the adjacent roots increased with planting density. With the increase of planting density, root weight, length, volume and surface area decreased, but the density of soil root increased. Roots and school shoots the ratio, not affected by planting distance. Roots less than 2 mm in diameter rarely contribute to an increase in root weight and volume but are beneficial for increases in length and surface area. The planting distance affected the distribution and depth of the root system. When the planting distance was small, 25% of the root weight was below 50cm in the soil layer, but only 15cm below the soil layer under the larger planting distance. In all depths, the density of roots increased with decreasing planting distance. With different depths, the distribution proportion of fine roots (diameter <2 mm) and main roots (diameter> 2 mm) were different. Under all different planting distances , The main root in the soil at the upper 25cm at a larger number.