Comparison of nutrient dynamics of throughfall and soil solution under bamboo (Phyllostachys pubescens) and Japanese cypress (Chamaecyparis obtusa) stands

概要

論文の詳細を見る
In the Japanese countryside, bamboo stands are spontaneously expanding and invading adjacent forests and farmlands due to poor management. In order to obtain basic information regarding the influences of this expansion on nutrient dynamics in forest ecosystems, this study monitored inorganic ion and Si concentrations as well as fluxes in incident precipitation, throughfall, and soil solution in an expanding bamboo stand, Phyllostachys pubescens (BB), in Kochi Prefecture in comparison to a planted Japanese cypress stand, Chamaecyparis obtusa (HN). The soil in BB was less acidic with higher contents of exchangeable bases-especially Ca-than in HN. The allocation of the incident precipitation into throughfall and stemflow, and the amount of percolating water did not differ much between HN and BB. The pH and EC levels, and K^+, Ca^<2+>, Cl^-, SO_4^<2->, H_2PO_4^-, and Si concentrations of throughfall and soil solution were much higher in BB than in HN-particularly from June to July, i.e. during and immediately after the leaf-fall season of the bamboo species. The differences were less obvious during winter. Nutrient fluxes in throughfall and soil solution gradually became larger in BB than in HN. These results can be attributed mainly to nutrient leaching from dead bamboo leaves that were still attached to the plants and subsequently fell to the ground.
2011-06-30