Evaluation of the Above-ground and Root Growth of Deciduous Trees When Different Root-wrapping Materials Are Used

27 Mar Evaluation of the Above-ground and Root Growth of Deciduous Trees When Different Root-wrapping Materials Are Used

View Original

Abstract

根巻の有無と根巻資材の相違が移植樹木の生育・発根に及ぼす影響を2樹種 (コブシ・クヌギ) の落葉樹木を対象に, 地上部生育量・発根量から明らかにすると共に, その影響について根巻資材の物理的障害要因である水分・地温及び資材分解状況より検討を行った。その結果, 移植経過28ケ月後では根巻の有無と資材の相違が, 移植樹木の生育と発根状況には影響がないことが認められた。それは, 試験期間中の土壌水分と地温の差が少なく, 埋設28ケ月後の各種根巻資材の重量分解率が69～88%程度に進行し, ほぼ無根巻区の場合と同等になることから, 根巻資材が移植樹木の生育と発根を抑制しないことが原因と考えられた。

English Abstract

This paper reports the results of a study of the effect of using different root-wrapping materials, or using none, on the above-ground and root growth of two types of deciduous trees (Magnolia kobus and Quercus acutissima). The study also monitored the soil temperature and soil water, which cause root-wrapping materials to biodegrade: during the test period, differences between the trees-in terms of soil temperature and the amount of soil water-were small. Results for both types of trees, 28 months after transplanting, showed that using different root-wrapping materials-or not using root wrapping-had no effect on the growth of transplanted trees. We found that the reason was that (after 28 months) between 69% and 88% by weight of the root-wrapping materials had biodegraded, so the conditions for trees with root wrapping were virtually the same as for those without. This indicates that root-wrapping does not interfere with the root development and growth of transplanted trees.