Forest harvesting effects on soil temperature, moisture, and respiration in a bottomland hardwood forest
Forest harvesting effects on soil temperature, moisture, and respiration in a bottomland hardwood forest
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DOI：
10.2136/sssaj1999.03615995006300030029x
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发表时间：
1999-05
影响因子：
2.9
通讯作者：
A. Londo;M. G. Messina;S. Schoenholtz
中科院分区：
文献类型：
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作者：
A. Londo;M. G. Messina;S. Schoenholtz
森林干扰对碳循环的影响已成为一个问题，因为人们担心大气中碳含量不断上升。我们研究了收获后6和22个月之间的收获强度在原位和实验室矿物土壤呼吸在东德克萨斯州的低地硬木林。处理包括皆伐、部分伐（其中去除约58%的基部面积）和未收获的对照。原位呼吸（CO2释放）采用碱石灰吸收法，室内矿质土壤呼吸采用湿碱法。土壤温度和水分含量也进行了测量。收获显着（P = 0.05）增加原位呼吸在大多数采样期间。这种影响归因于与采后重新植被相关的活根和微生物区系活动的增加。随着处理土壤温度的升高（平均范围8.3-29.1°C），原位呼吸呈指数增长（Q10关系），但在测量的土壤水分范围内遵循抛物线型模式（平均范围10.4-31.5%）。总体而言，皆伐地的平均CO2排放速率（7.15gCO2m2d-1）显著高于部分伐地（5.95gCO2m2d-1），而部分伐地的平均CO2排放速率（4.95gCO2m2d-1）又显著高于对照地。质量平衡估计表明，这些治疗差异将有很少或根本没有长期的影响，这些管理的森林固碳。
The effect of forest disturbance on C cycling has become an issue, given concerns about escalating atmospheric C content. We examined the effects of harvest intensity on in situ and laboratory mineral soil respiration in an East Texas bottomland hardwood forest between 6 and 22 mo after harvesting. Treatments included a clearcut, a partial cut wherein approximately 58% of the basal area was removed, and an unharvested control. The soda-lime absorption technique was used for in situ respiration (CO 2 efflux) and the wet alkali method (NaOH) was used for laboratory mineral soil respiration. Soil temperature and moisture content were also measured. Harvesting significantly (P = 0.05) increased in situ respiration during most sampling periods. This effect was attributed to an increase in live root and microflora activity associated with postharvesting revegetation. In situ respiration increased exponentially (Q 10 relationship) as treatment soil temperatures increased (mean range 8.3-29.1°C), but followed a parabolic-type pattern through the range of soil moisture measured (mean range 10.4-31.5% Mean rates of laboratory mineral soil respiration measured during the study were unaffected by cutting treatment for most sampling sessions. Overall, the mean rate of CO 2 efflux in the clearcuts (7.15 g CO 2 m -2 d -1 ) was significantly higher than that in the partial cuts (5.95 g CO 2 m -2 d -1 ), which in turn was significantly higher than that in the controls (4.95 g CO 2 m 2 d -1 ). Mass balance estimates indicate that these treatment differences will have little or no long-term effect on C sequestration of these managed forests.