关键词: 土壤呼吸, 温度敏感性(Q₁₀), 经营措施, 毛竹林

Abstract: [Objective] Forest management is recognized as an important way to mitigate CO₂ emission from soils. Under the global warming, understanding the effects of different managements on temperature sensitivity of soil respiration is helpful to determine the response and adaptation of under-ground processes to climate change and to identify the positive/negative feedbacks of soil respiration to climate change. [Method] Our study included four treatments:control(Ⅰ), reclamation(Ⅱ), herbicide application(Ⅲ) and herb-chopping(Ⅳ). Trenching and litter removal were used to separate the components of soil respiration and LI-8100 was used to measure soil respiration and soil temperature at depth of 5 cm. Exponential model was employed to describe temperature sensitivity of soil respiration(Q₁₀). [Results] ① Components of soil respiration were exponential with soil temperature at depth of 5cm;② Q₁₀ of total soil respiration was in an order of Winter > Summer > Spring > Autumn. Reclamation, herbicide application and herb-chopping decreased Q₁₀ of total soil respiration. ③ The order of Q₁₀ of root respiration was Summer > Winter > Spring > Autumn. All managements reduced Q₁₀;④ Q₁₀ of litter respiration was in an order of Summer > Winter > Autumn > Spring. Reclamation, herbicide application and herb-chopping declined Q₁₀;⑤ Q₁₀ of mineral respiration was in an order of Spring > Winter > Summer > Autumn. Reclamation increased Q₁₀ while other two managements decreased Q₁₀. [Conclusion] Given mitigation of CO₂ emission and adaptation of soil respiration to global climate change, herbicide application may be a relatively reasonable management for Moso bamboo forest in this area.

Key words: soil respiration, temperature sensitivity (Q₁₀), management, Phyllostachy edulis