Abstract
Long term fluctuations of fine particulate organic carbon (FPOC) and nitrogen (FPON) were analyzed in two mountain streams located in the northern part of Gunma prefecture. Then transport yields were estimated by rating curve (LLQ) and the product of the concentration of FPOC or FPON and discharge (LCQ). Both transport yields of the FPOC and the FPON have about 12 ~ 20% difference between by LLQ and LCQ. LLQ underestimates the transport rate at low flow rates, on the other hand, LCQ underestimates the transport rate at no sampling during flood. Applying an appropriate monitoring method is important to estimate the transport yield of particulate organic matter. The influence of discharge on the transport yield of FPOC and FPON is large in both methods. In addition, CN ratio representing the quality of organic matter had no difference. Therefore, forest type difference has a subtle influence on the transport of particulate organic matter.
