Seasonality of sprouting in the exotic treeRobinia pseudoacaciaL. in Hokkaido, northern Japan

Abstract

Robinia pseudoacacia L., one of the major invasive tree species in Japan, has been used for coppice wood production worldwide. However, we have little knowledge of the species' sprouting characteristics. Here, we tested seasonality in R. pseudoacacia sprout development. We removed aboveground parts of R. pseudoacacia at different times throughout the year (spring, summer, autumn, and winter) and censused sprout demographics for three consecutive growing seasons thereafter. The most vigorous sprouting was observed among trees cut in winter, while sprouting was lowest among those cut in summer. Sprout abundance in the spring-and autumn-cut treatments was intermediate between that of winter-and summer-cut treatments. Both trunk diameter and season affected stump sprout biomass after three growing seasons, following the same seasonal pattern as above. We found a negative relationship between the herbaceous vegetation cover height and the biomass of root suckers. Both trunk removal in summer and consecutive sprout-clipping treatments contributed to the decline of living stumps. Our results show that R. pseudoacacia trees should be cut during the dormant season to facilitate coppicing and in the summer to facilitate control or removal. Conservation of herbaceous vegetation cover, together with consecutive sprout clipping, will aid the complete removal of this species.

Effect of Explant Source on Phenotypic Changes of In Vitro Grown Cannabis Plantlets over Multiple Subcultures

“…Therefore, it can be concluded that explants derived from basal and near-basal parts of the mother plant are considerably more appropriate initial explants for in vitro rejuvenation and multiplication. Similar to our results, previous studies using other plant species showed that the source of the explants plays a pivotal role in successful in vitro rejuvenation [ 26 , 64 , 65 , 66 , 67 , 68 , 69 , 70 ].…”

Photosynthetic nitrogen utilization of Robinia pseudoacacia, an invasive species, grown in contrasting light conditions: A leaf scale approach

“…We have frequently found severe problems in plant communities where R. psudoacacia was introduced. This species is highly invasive, and its escape from its original planted site threatens the native forest vegetation in Japan (Masaka et al, 2015; Sakio, 2009; Yamada & Masaka, 2007). Recent global climate changes such as the increase in wildfires in central Europe or the frequency of typhoons in East Asia are creating large areas of disturbed land, and consequently providing R. psudoacacia trees many chances to invade other areas in the forests (Koike et al, 2009; Nicolescu et al, 2020; Puchałka et al, 2021; Sakio, 2009; Vítková et al, 2017).…”

Effect of damaged horizontal roots caused by forestry vehicles on the root sucker emergence of <i>Robinia pseudoacacia</i> in a coastal <i>Pinus thunbergii</i> forest

“…N N 萌芽により群落を拡大することが知られている 6) 。根萌芽に は，若い根から恒常的に発生して個体の分布を拡大させるも ののほか 6， 11) ，地上部の伐採等の攪乱によって発生するもの もある 13) 。 海岸マツ林に生育しているニセアカシアの場合，根萌芽の 発生のほとんどは水平根の伸長に伴う恒常的なものであると されているが 6) 表-2 全詳細調査区における損傷タイプ別の水平根の総本数 Table 2 The total number of horizontal roots in each damaged class in the minute observation plots…”