Long-term evaluation of soil-warming effect on carbon and nitrogen dynamics of Japanese forest soils

为了评价土壤变暖对土壤碳、氮动态的长期影响，在日本的6个森林中进行了土壤变暖试验。还对柏树和柳杉幼树进行了升温试验，以评价升温对其生长的影响。土壤变暖增强了6种林分的异养呼吸，但土壤水中溶解有机碳和氮含量的增加仅在寒温带混交林中观察到。在4个月的试验期内，增温降低了幼树的CO2和H2O交换，但没有改变幼树的生长速度。

Soil warming experiment was conducted in 6 Japanese forests to evaluate long-term effectof soil warming on the soil carbon and nitrogen dynamics. Warming experiment was also conducted to Japanese cypress and cryptomeria saplings to evaluate the effect of warming on the growth. Soil warming enhanced heterotrophic respiration at all of 6 forests, but the increase in the dissolved organic carbon and nitrogen content in the soil water was only observed at a cool-temperate mixed forest. Warming decreased CO2 and H2O exchanges of saplings, but did not change the growth rate within 4-month experimental period.