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土壤CO_2通量是陆地生态系统碳循环的第二大通量,其很小的变化就能严重改变大气CO_2浓度的平衡。本研究分析了土壤pH和EC对盐碱土土壤CO_2通量的重要组成—土壤无机CO_2通量的作用。实验于2010年6—9月在中国科学院新疆阜康荒漠生态站进行。采用高压灭菌的方法,将9种盐碱土的土壤无机CO_2通量从土壤CO_2通量中分离。结果表明,在土壤类型一定时,土壤无机CO_2通量主要受温度控制;低温有利于CO_2吸收,高温有利于CO_2释放。土壤pH可作为指示盐碱土土壤无机CO_2通量作用大小的指标;在低温和高温阶段,土壤pH对土壤无机CO_2通量的作用效果不同。土壤盐分较大的变化,才能造成土壤无机CO_2通量的显著差异。本研究分析了盐碱土土壤无机CO_2通量的特征,为盐碱土无机CO_2通量过程机制的推导提供证据。开展不同盐碱土土壤无机CO_2通量研究将极大促进干旱区盐碱土碳循环的解读。
Soil CO2 flux is the second largest flux of carbon cycle in terrestrial ecosystems, and its small change can seriously change the balance of atmospheric CO 2 concentration. This study analyzed the effect of soil pH and EC on the soil CO 2 flux, an important component of CO 2 flux in saline-alkali soil. The experiment was carried out at the Fukang Desert Ecological Station of Xinjiang Academy of Sciences from June to September in 2010. The method of autoclaving was used to separate soil inorganic CO 2 fluxes from 9 kinds of saline-alkali soil from soil CO 2 flux. The results showed that the soil inorganic CO 2 flux was mainly controlled by temperature at a certain soil type; low temperature was favorable for CO 2 absorption and high temperature was favorable for CO 2 release. Soil pH can be used as an indicator of soil inorganic CO 2 flux in saline-alkali soil. The effect of soil pH on soil inorganic CO 2 flux is different at low temperature and high temperature. Soil salinity larger changes in order to cause significant differences in soil inorganic CO 2 flux. This study analyzed the characteristics of inorganic CO_2 fluxes in saline soils and provided evidence for the derivation of the mechanism of inorganic CO_2 fluxes in saline soils. Carrying out studies on inorganic CO_2 flux in different saline soils will greatly promote the carbon cycle of saline soils in arid land.