잠시만 기다려 주세요. 로딩중입니다.

Diurnal and seasonal patterns of nitrogen fixation in analnus hirsuta plantation of central Korea

한국식물학회지 2005년 48권 3호 p.332 ~ 337
 ( Lee Yoon-Young ) - Korea University Division of Environmental Science and Ecological Engineering

 ( Son Yo-Whan ) - Korea University Division of Environmental Science and Ecological Engineering

Abstract


We used an acetylene reduction assay to measure rates of nitrogen fixation on a 38-year-oldAlnus hirsuta plantation in central Korea. The diurnal pattern of acetylene reduction changed significantly during May, August, and October, typically varying by 3-fold throughout the course of the day. Maximum rates occurred at 3 p.m. in May and October, but at 6 p.m. in August. Increasing trends were evident during the early growing season, with sustained high rates from mid-May through late September; July had the highest rates, averaging 7.2 μmole g-1 dry nodule h-1. The average nodule biomass for this plantation was 220 kg ha ’. Rates of acetylene reduction were related to soil temperature, but not to soil moisture content. Combining these nodule biomass calculations with seasonal average acetylene reduction rates yielded an estimate of current annual nitrogen fixation of 60 kg N ha-1 for the plantation. This rate of annual nitrogen addition was very large in relation to the yearly nitrogen requirements of coniferous and deciduous forests in central Korea.

키워드

Alnus hirsuta; diurnal variation; nitrogen fixation; seasonal variation
원문 및 링크아웃 정보
 
등재저널 정보