南亚热带森林凋落物对土壤呼吸的贡献及其影响因素

doi:10.11867/j.issn.1001-8166.2007.09.0976

应用静态箱—气相色谱法对鼎湖山南亚热带3种主要类型森林土壤呼吸（S+L和S）进行长达31个月的连续观测，结果表明：季风常绿阔叶林（BF）、针阔叶混交林（MF）和马尾松林（PF）凋落物对土壤呼吸年平均贡献率分别为27.82%、33.29%和36.35%，而且3个林型具有相同的季节动态特征，高峰期出现在雨季（4~9月），分别占全年贡献量的71.87%、61.89%和70.39%。土壤呼吸（S+L）与凋落物输入量的季节变化有极显著正相关性（P＜0.001）；土壤含水量与凋落物对土壤呼吸贡献的相关性均达到极显著水平（P＜0.001）；土壤温度与土壤呼吸通量呈显著的正相关关系，但与凋落物对土壤呼吸的贡献的关系并不明显；降雨天气凋落物对土壤呼吸贡献率分别为28.63%、38.20%和40.12%，显著高于晴朗天气。

关键词: 凋落物, 影响因素, 南亚热带森林, 土壤呼吸, 贡献

Three main types of Soil respirations(S+L and S) in southern subtropical forests in Dinghushan biosphere reserve were consecutively being monitored over 31 months by the approach of static chamber-gas chromatograph techniques. Research shows that: annual mean contribution rates of litter-fall to soil respiration in the monsoon evergreen broadleaf forest (BF), mixed broadleaf-coniferous forest (MF) and coniferous(pine) forest (PF) reached 27.82%、33.29%和36.35% respectively; Moreover, all three types of forests displayed the same seasonal dynamic features with the peaks contributions of them were from April to September, which accounts for 71.87%、61.89% and 70.39% of annual total contributions of litterfall to soil respiration respectively. Soil respiration(S+L) had an obviously positive relationship with the seasonal changes of litter-fall input（P<0.001; And soil water content had a significant impact on the contribution of litter-fall to soil respiration in the three types of forests (P<0.001); Soil temperature had positive correlativity with soil respiration flux, though it has no distinctive relationship with contribution of litter-fall to soil respiration; the contribution ratios of litter-fall to soil respiration on rainy days were 28.63%、38.20% and 40.12% respectively, which were significantly higher than those in the sunny days in the three types of forests.

Key words: Soil respiration, Litter-fall, Contribution, Affacting factor., Southern subtropical forest

中图分类号:

S718.5

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Contributions of Litter-fall to Soil Respiration and Its Affacting Factors in Southern Subtropical Forests of China