Chronological dataset of soil respiration fluxes from a seasonally dry forest in Northwest México

Soil respiration data was acquired and analyzed as described in Vargas-Terminel et al.[1]. Briefly, soil respiration was obtained by measuring changes in CO₂ concentrations with a portable soil flux system attached to a static chamber covering a portion of soil. Each measurement cycle in soil lasted 3 mins and was done monthly during a four-year period in 8 to 12 locations within three sites of tropical dry forest in Northwestern Mexico (a recent abandonment, a mid-secondary forest and an old-growth). Also, simultaneous soil temperature and volumetric soil water content measurements were carried with a thermocouple thermometer and a soil moisture sensor, respectively. Finally, soil respiration flux was calculated with commercial soil data processing software.

土壤呼吸数据的获取与分析参照Vargas-Terminel等人[1]的研究方法。简言之，本研究通过将便携式土壤通量系统（portable soil flux system）连接至覆盖部分土壤区域的静态箱（static chamber），测量二氧化碳（CO₂）浓度变化以获取土壤呼吸数据。单次土壤测量周期时长为3分钟，在四年监测周期内每月开展一次测量，测量覆盖墨西哥西北部三处热带旱林样地的8至12个采样点位，三处样地分别为近期弃耕样地、中度次生林样地与原始老龄林样地。与此同时，研究人员分别使用热电偶温度计（thermocouple thermometer）与土壤湿度传感器（soil moisture sensor），同步采集土壤温度与体积含水量数据。最终，借助商业化土壤数据处理软件计算得到土壤呼吸通量。