奥地利中部阿尔卑斯山上部林线处瑞士石松林土壤呼吸的季节变化。

Seasonal variation of soil respiration in a Pinus cembra forest at the upper timberline in the Central Austrian Alps.

作者信息

Wieser Gerhard

机构信息

Federal Office and Research Centre for Forests, Forest Tree Physiology, Rennweg 1, A-6020 Innsbruck, Austria.

出版信息

Tree Physiol. 2004 Apr;24(4):475-80. doi: 10.1093/treephys/24.4.475.

DOI:10.1093/treephys/24.4.475

PMID:14757586

Abstract

Soil respiration (R) of a 95-year-old Pinus cembra L. forest at the alpine timberline was measured continuously from October 2001 to January 2003 with an automated multiplexing gas exchange system. There was significant spatial variability in soil respiration, and R at a soil temperature of 10 degrees C (R10) decreased by about 20% m(-1) with increasing distance from the trunk. Needle litter and fine root density also decreased. The spatially averaged annual soil CO2 efflux was 35 g C m(-2) year(-1) in 2002. About 70% of the temporal variation in soil respiration could be explained by variations in soil temperature, whereas the influence of soil water potential and thus soil water content was negligible because soil water availability was supra-optimal.

摘要

2001年10月至2003年1月期间，使用自动多路复用气体交换系统对高山林线处一片95年生的瑞士石松森林的土壤呼吸（R）进行了连续测量。土壤呼吸存在显著的空间变异性，在土壤温度为10摄氏度时的R（R10）随着距树干距离的增加而降低约20% m(-1)。针叶凋落物和细根密度也降低。2002年空间平均年土壤CO2通量为35 g C m(-2) 年(-1)。土壤呼吸的时间变化约70%可由土壤温度变化解释，而土壤水势及因此土壤含水量的影响可忽略不计，因为土壤水分有效性处于超优状态。