东北地区几种不同林分土壤呼吸组分的差异性

利用壕沟隔断法对老山实验基地的4种主要林分(落叶松、红松、樟子松和白桦)的土壤呼吸进行了研究，探讨了组成土壤呼吸各组分间的差异。结果表明：微生物呼吸占整个土壤呼吸的比例最高。平均在60％以上；根系呼吸在土壤呼吸中所占的比例次之，平均为20％～30％；枯枝落叶的呼吸速率占的比例较小。约为10％。不同处理下的土壤呼吸在季节变化上基本一致，与温度呈指数相关，但与土壤湿度的相关性较差。有、无根系土壤呼吸的Q10平均值分别为3．35和2．81。

The Difference between Different Components of Soil Respiration in Several Types of Forests in Northeastern China

Soil respiration was measured in four forest stands (larch, Korean pine, Sc otch pine and birch) by trenching-box in Laoshan Station, Northeast Forestry Uni versity, in order to investigate the difference among the components of soil res piration. The result showed that the highest proportion to total soil respiratio n was microbial respiration (above 60%), the second one was root respiration (20 %~30%), and the lowest was litter respiration (10%). The variation of soil respi ration under different treatments was exponentially correlated with soil tempera ture. There was no obvious correlation between respiration and soil moisture. Q 10 values of root respiration and microbial respiration were 3.35 and 2 .81 respectively.