Study on the vegetation-enbironment interaction in the rooting zone of disturbed area.

本研究旨在阐明生长于严重干扰区植物根区的植被-环境相互作用，以期将其应用于植被重建工程。为了解释植被与环境的相互作用，我们选择了乌苏山为2000年喷发的火山扰动区，萨特苏奈加瓦河岸为河岸扰动区，日达卡地区的山坡为大规模侵蚀扰动区。在乌苏山新火山口周围的火山干扰地，记录了植被恢复过程的早期阶段，调查了侵染植物根系的外生菌根(ECM)或丛枝菌根(AM)类型。在河岸扰动区，除调查河岸带营养状况外，还对其林分动态和生长特性进行了调查。在此基础上，对沙柳幼苗根部的侵染率、侵染类型和侵染季节动态进行了调查，并对可用于植被工程的树苗基质进行了调查。我们成功地在半开放条件下人工感染了ECM。这些都是根际植被-环境相互作用系统应用于高级工作的一定进展。

This study was carried out to elucidate the vegetation-environment interaction in the rooting zone of plants growing on heavily disturbed area for the purpose of applying the relationships to revegetation works. To explain the vegetation-environment interaction, we selected the disturbed areas such as Mt.Usu for volcanic disturbed site which erupted in 2000, river side of Satsunai-gawa for riparian disturbed area, and mountain slopes of Hidaka district for large scale erosion disturbance area. The survey were conducted in each site for the disturbance resume, revegetation process, growth analysis of invaded trees, mycorrhiza infection to the plant roots and physical and chemical site conditions.On the volcanic disturbed site around the new craters of Mt.Usu, early stage of vegetation recovery process was recorded and ectomycorrhiza (ECM) or arbuscular mycorrihza (AM) types which infected to the plant roots were investigated. On the disturbed area of river sides, we investigated the stand dynamics and growth characteristics of Chosenia arbutifolia in addition to the nutrient condition of riparian zone. Further, the infection ratio, the types of ECM and seasonal dynamics of ECM infection on the roots of Salix sachalinensis seedlings were surveyed.And also, we investigated the culture medium of tree seedlings which expected to use for vegetation works. We succeeded in artificial infection of ECM in semi-open condition. These are the certain progress for the application to the advanced works of the vegetation-enbironment interaction systems in the rooting zone.