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对土地的人工管理影响到土壤CO2的排放。西双版纳是中国橡胶主要种植区,施肥是橡胶林获取更好效益的主要管理措施之一。为探讨施肥对橡胶林土壤CO2排放的影响,选取西双版纳大面积种植的橡胶林,采用静态箱-气相色谱法开展了不同施肥处理试验。结果表明:(1)施肥处理没有改变西双版纳橡胶林土壤CO2排放的时间变化特征;(2)不同施肥处理和对照的西双版纳橡胶林土壤CO2排放均呈现出雨季大于干季的趋势,年排放总量在7.88~7.93 t C·hm-2·a-1;(3)不同施肥处理的土壤CO2月排放量大于对照;(4)施肥处理在一定程度上可促进土壤呼吸,使土壤CO2排放增加,但差异不显著(P>0.05)。本研究结果为进一步揭示西双版纳橡胶林生态系统碳循环过程及其机理提供支持,为把握橡胶林碳平衡动态和应对全球变化提供参考,也可为橡胶林的可持续利用提供科学依据。
Man-made land management affects soil CO2 emissions. Xishuangbanna is one of the main management measures for the rubber plantation in China, where rubber is the main planting area. In order to investigate the effect of fertilization on CO2 emission from rubber plantation soil, large-scale rubber plantations were selected in Xishuangbanna, and different fertilization treatments were carried out by static box-gas chromatography. The results showed that: (1) The fertilization treatment did not change the temporal variation of CO2 emission in the soil of Xishuangbanna rubber plantation. (2) The soil CO2 emission of Xishuangbanna rubber plantations with different fertilization treatments and control tended to be greater than the dry season in rainy season, (7.88- 7.93 t C · hm-2 · a-1). (3) The monthly CO2 emission of soils under different fertilization treatments was mainly on the basis of the annual discharge. (4) Fertilization could promote soil respiration to a certain extent and increase soil CO2 emissions, But the difference was not significant (P> 0.05). The results of this study will provide a reference for further revealing the carbon cycle process and mechanism of rubber plantation ecosystem in Xishuangbanna, and provide a reference for the carbon balance dynamics of rubber plantation and response to global changes. It can also provide a scientific basis for the sustainable use of rubber plantation.