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首页> 外文期刊>Ecological research >Temporal variation in CO_2 efflux from soil and snow surfaces in a Japanese cedar(Cryptomeria japonica) plantation,central Japan
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Temporal variation in CO_2 efflux from soil and snow surfaces in a Japanese cedar(Cryptomeria japonica) plantation,central Japan

机译：日本中部雪松（Cryptomeria japonica）人工林土壤和雪表面CO_2外排的时间变化

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摘要

CO_2 efflux from soil and snow surfaces was measured continuously in a Japanese cedar {Cryptomeria japonica D. Don) forest in central Japan using an open dynamic chamber system. The chamber opens and closes automatically and records measurements based on an open-flow dynamic method. Between May and December, mean soil CO_2 efflux ranged from 1,529 mg CO_2 m~(-2) h~(-1) in September to 255 mg CO_2 m~(-2) h~(-2) in December. The seasonal change in CO_2 efflux from the soil paralleled the seasonal pattern of soil temperature. No marked diurnal trends in soil CO_2 efflux were observed on days without rainfall, whereas significant pulses in soil CO_2 efflux were observed on days with rainfall. In this plantation, soil CO_2 efflux frequently responded to rainfall. Measurements of changes from litter-covered soil to snow-covered surfaces revealed that CO_2 efflux decreased from values of ca. 250 mg CO_2 m~(-2) h~(-1) above soil to less than 33 mg CO_2 m~(-2) h~(-1) above snow. Soil temperature alone explained 66% of the overall variation in soil CO_2 efflux, but explained approximately 85% of the variation when data from two anomalous periods were excluded. Moreover, we found a significant correlation between soil CO_2 efflux and soil moisture (which explained 44% of the overall variation) using a second-order polynomial function. Our results suggest that the seasonality of CO_2 efflux is affected not only by soil temperature and moisture, but also by drying and rewetting cycles and by litterfall pulses.
机译：在日本中部的日本雪松（Cryptomeria japonica D. Don）森林中，使用开放式动态室系统连续测量土壤和雪表面的CO_2外流。腔室自动打开和关闭，并基于开放式动态方法记录测量结果。在5月和12月之间，平均土壤CO_2排放量从9月的1,529 mg CO_2 m〜（-2）h〜（-1）到12月的255 mg CO_2 m〜（-2）h〜（-2）。土壤中CO_2外排量的季节变化与土壤温度的季节变化趋势平行。在没有降雨的日子里，没有观察到土壤CO_2外排的明显的昼夜趋势，而在有降雨的日子里，观察到了土壤CO_2外排的明显脉动。在该人工林中，土壤CO_2的流出经常对降雨产生响应。测量从被垃圾覆盖的土壤到被雪覆盖的表面的变化表明，CO_2的流出量从ca的值开始降低。在土壤上方250 mg CO_2 m〜（-2）h〜（-1）至雪上方33 mg CO_2 m〜（-2）h〜（-1）。仅土壤温度就解释了土壤CO_2外流总体变化的66％，但是当排除两个异常时期的数据时，可以解释约85％的变化。此外，我们使用二阶多项式函数发现了土壤CO_2流出与土壤水分之间的显着相关性（这解释了总变化的44％）。我们的结果表明，CO_2外排的季节不仅受土壤温度和湿度的影响，还受干燥和再湿润周期以及凋落物脉冲的影响。

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