第八章 园林树木的栽植.ppt

* Ten simple steps to planting a tree. The goal when you are finished planting and ready to add mulch is shown in the photograph on the right. The arrow points to the side of the root ball raised above the surrounding landscape soil. * There were no roots evident where the trunk met the root ball. This indicated that the point where the top-most root met the trunk might have been too deep in the root ball. The black media on the ground to the left of the container was just removed from the top of the container to expose the top-most root and the swollen root flare. After cutting the circling roots growing at the base of the trunk, this tree is ready for planting. * There are no surface roots evident where the trunk meets the root ball. This indicates that the point where the top-most root emerges from the trunk might be too deep in the root ball. The moist, darkened area on the trunk base indicates the portion of the trunk that was buried with soil. Remove soil from on top of the ball so the point where the top-most root emerging from the trunk is within the top 2 inches of soil. In so doing, check for and cut roots that circle, those that are kinked, or those that cross over major roots. This could require a good bit of work and time, especially if the root ball is clay, or if the tree is a maple, birch, crapemyrtle or other dense, fibrous-rooted tree, or if the top-most root is more than a couple inches deep. * The point where the top-most root emerges from the trunk (see arrow) is at the surface after removing excess soil from the top of the root ball. Although exposing the top-most root is not necessary, it is a convenient method of checking for root defects such as circling roots. Now the root ball is ready to receive soil and/or mulch to cover the sides of the root ball. * These trees were struggling about ten years after planting. Roots grew through plastic or artificial burlap with little trouble as shown here. Note the size of the trunk compared to the r