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Rashid, Md. Harun,Asaeda, Takashi,Uddin, Md. Nazim The Korean Society of Weed Science and The Turfgra 2010 Weed Biology and Management Vol.10 No.1
This study investigated the allelopathic effects of kudzu litter on the seed germination and early growth of Bidens pilosa and Lolium perenne. The bioassays, with various concentrations (10, 20, 30, 40, and 50 $g\;L^{-1}$) of aqueous kudzu litter leachate, significantly affected the germination percentages and radicle growth of both species. These parameters decreased progressively when the seedlings were exposed to increasing concentrations of leachate. The root and shoot length, dry weight, and chlorophyll concentration of the B. pilosa and L. perenne seedlings also were significantly affected when they were grown in leachate-amended soil. However, the chlorophyll fluorescence values of the seedlings subjected to different concentrations of aqueous kudzu litter leachate indicated that the mere presence of leachate in the soil was not stressful for the plants. The seedlings of both species were under stressful conditions only when they were grown in the soil that was treated with higher concentrations of leachate (30, 40, or 50 $g\;L^{-1}$). A 6 week decomposition study of the kudzu litter in soil was conducted to observe the retention of phenolic content in the soil. The results showed that, although the concentration of dissolved organic carbon decreased with increasing decomposition, the phenolic concentration was not significantly affected when the observation period ended. This suggests that the phytotoxic properties of kudzu litter remain stable in soil systems for a considerable amount of time after incorporation into the soil.
Development of A Simulation Model Considering Vegetation Growth and Flushing in Arakawa River
Hideaki Sekine,Kentaro Sakamoto,Tatuya Nishimura,Takashi Asaeda 대한토목학회 2012 KSCE Journal of Civil Engineering Vol.16 No.2
In the present study, we developed a simulation model that could predict the growth of trees and erbaceousplants for a long time. The growth of plants is formulated as the material processing of the plants, photosynthesis, respiration and mortality. Empirically obtained allometry relationship is also added in the tree model. While, the herb model was formulated by sucession of plants. Combined with the physical model, it was applied to the observed results of the vegetation succession on the sediment bar of Arakawa River after the record-breaking flood in 2007. The sufficient agreement was obtained for the vegetation succession. The model enable us to predict the growth pattern of vegetation successfully.