The exudates of plant roots influence on the seed germination abilities in their neighboring areas. The effects of exudates on seed germination depend on the host plants and environmental conditions. Once seeds germinate, the ovestory plants continue to influence the growth of seedlings by changing soil nutrient status.
Common mycorrhizal network (CMN) also plays a vital role in the early succession after severe disturbances that lack nutrients in soil. Therefore, the interspecific underground interactions should be clarified more to understand the successional traits.
After the 1929 eruption on Mount Koma, northern Japan, an introduced tree, Larix kaempferi, regenerated more than native trees, such as Betula platyphylla. Salix renii facilitated the establishment of other species, including L. kaempferi, by the improvement of microclimate and soil nutrient status, seed immigration and mycorrhizal formation. I focused on my research underground interactions between them, especially how improved soil nutrient status and common mycorrhizal network(CMN) are favored by L. kaempferi seedlings.
I also surveyed the interactions between Carex oxyandra and Polygonum sachalinense of Mt. Usu. Two species are generally known as non-mycorrhizal plants. So their interactions will be studied in a point of exudates including allochemicals and soil ameliation.
To get clues for the above points, I have been carrying out greenhouse experiment since January 2012. And the harvesting and data collection is going on. I would like to discuss some results and research plans