采用SRS-1000便携式土壤呼吸仪对四川省丹陵县集体林区巨桉短轮伐期1~6年生林分的土壤呼吸速率和5 cm土壤温度进行测量,并采用根钻法在不同季节测量所有年龄巨桉林活细根(<2 mm)生物量。结果表明: 1)不同年龄巨桉林每月初期土壤呼吸速率在0.35~1.71 μ mol·m-2 s-1间波动,季节趋势为,夏季(1.35)>秋季(1.16)>春季(0.62)>冬季(0.41 μmol·m-2 s-1)(P <0.01)。1~6年生的巨桉林土壤呼吸速率年均值表现出“高—低—高”的趋势(P<0.01),6年生巨桉林土壤呼吸速率最高; 2)土壤呼吸速率月变化与土壤温度存在显著相关性。用月初动态拟合的1~6年生林分土壤呼吸温度敏感性Q10大小为: 4年生(2.29)> 1年生(2.03)> 6年生(1.95)> 3年生(1.88)> 2年生(1.83)> 5年生(1.73)(P<0.01); 3)土壤温度和0~50 cm细根生物量与土壤呼吸速率具有二元线性回归关系(r=0.964 0),它们对土壤呼吸的季节变化贡献率基本相等。
This research examined monthly dynamics of soil respiration and their relationships with soil temperature at 5 cm depth (using Lci Portable Photosynthesis System (SRS-1000)) and seasonal variations of fine root (<2 mm) biomass in 0~50 cm depth (soil core method) in an age series (1~6-year-old) of Eucalyptus grandis. The results showed that monthly (early month) soil respiration rate (SRR) ranged from 0.35 to 1.71 μmol·m-2 s-1, and the seasonal values were different as following descending sequence: summer (1.55), autumn (1.16), spring (0.62), winter (0.41 μmol·m-2 s-1) (P<0.01), and in different ages showed that 6-year-old (1.10)>5(0.99)>2(0.93)>1 (0.82)>3(0.80)>4(0.67 μmol·m-2 s-1) (P<0.01). The relationship between early monthly dynamics of SRR and soil temperature at 5 cm depth was significant (R2=0.706 3~0.965 7, P<0.05). The exponential equation of Rs=a·e(b·T) and Q10=e10b were applied to search the relationships of monthly soil temperature at 5 cm depth and SRR, and the temperature sensitivity (Q10) was from 1.73 to 2.29. The binary linear regression between soil temperature at 5 cm depth, fine root (<2 mm) biomass in 0~50 cm depth and SRR is significant (P<0.01).
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