伪潜育土季节性滞水条件下大冷杉(Abies grandis Lindl.)毫根动态的研究

DYNAMIC OF FINE ROOTS OF GRAND FIR (ABIES GRANDIS LINDL. ) TO PERIODICAL WATERLOGGING IN A PSEUDOGLEY SITE.

摘要:

本文对一个25年生大冷杉林在伪潜育土至45cm矿质土壤里,从1987年晚秋滞水期至1988年生长旺盛期的毫根量动态及化学组成变化进行了研究。 滞水期土壤中死根量(5558kg DS/ha)显著高于活根量(3594kg DS/ha)。生长旺盛期初,活根量增加约50％,死根量降低约27％。经过夏季至生长旺盛期末,活根量仍略有增加,死根量继续降低。毫根化学组成分析显示,滞水期活根中K、Mg及Zn离子含量显著低于生长旺盛期,Mn离子含量则明显高于生长旺盛期。这一结果表明,除了与季节性相关的生长节奏因素外,大冷杉毫根生物量的变化主要是由滞水状况所致。

Abstract:

The dynamic of fine root biomass in mineral soil up to 45cm and their chemical composition were investigated in a 25 years old grand fir stand on a pseudogley soil from the waterlogged period to the vegetation period (November 1987-September 1988) . Under waterlogging the fine roots had considerably higher dead mass (5558 kg DS/ha) than living mass(3594 kg DS/ha). At the start of the vegetation period the total mass of the living fine roots increased by 50% and the total mass of the dead fine roots decrea...