The Role of Phosphorus on Plant Succession of Grassland in Andosol Region I. P-cycle in annual and perennial plant communities

강산성 화산회토양에 있어서 초원의 천이에 미치는 인산의 역할 I. 일년생 및 다년생 목초 군락에 있어서 인의 순환

Phosphorus(P) cycle of Miscanthus sinensis, Sasa palmata and Artemicia princeps for perennial plants and Polygonwn thunbergii for annual plant were investigated in natural plant communities established in Andosol region. 1. Perennial plants contained about 50-80 % P of the maximum accumulated in whole plant in under ground parts as reserve P before wintering. On the other hand, annual plant returned the most part of P in plant tissues to soil and wintered with a small amount of P in only seed. 2. The storage percentage of K was low compared to P in both perennial and annual plants. And the return of K from litter to soil proceeded rapidly because of easy leaching of K. 3. Perennial plants stored a large amount of P in reserve organs before wintering and carry it over next generation, and P holded in an individual showed a yearly increase. Consequently, P was less susceptible to depressive factor for growth of perennial plants even in poor P circumstances like Andosol region, compared to annual plant.