2011 Fiscal Year Final Research Report

Effects of P limitation on nutrient cycling intemperate forests

Research Project

Project/Area Number	21580073
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Plant nutrition/Soil science
Research Institution	Hokkaido University
Principal Investigator	NAKAHARA Osamu 北海道大学, 大学院・農学研究院, 准教授 (10253519)
Co-Investigator(Kenkyū-buntansha)	SHIBUYA Masato 北海道大学, 大学院・農学研究院, 准教授 (10226194)
Project Period (FY)	2009 – 2011
Keywords	養分制限 / 窒素制限 / リン制限 / アロフェン / イモゴライト
Research Abstract	We examined nutrient limitation in 26 stands of larch forest onvolcanic parent material deposited 300-20,000 y BP at Mt. Shirahata, Sapporo, Japan.Root-ingrowth bioassay showed that of the 26 stands examined 13were N limited,3were Plimited, and 10 were N and P colimited. Nitrogen limitation was common in stands with afoliar N:P ratio<16. In stands with foliar N:P ratio>16, colimitation by N and P dominated,but P limitation was observed at three stands.