增温对亚热带森林土壤可溶性有机碳影响的比较

issolved organic carbon (DOC) is very sensitive to climate change, and thus plays a vital role in the carbon cycle in the forest ecosystem. In the present study, the soil warming (+4℃) technology is employed to observe and compare the effects of warming on the concentration of DOC extracted by the cold water (hereafter CDOC), the hot water (hereafter HDOC), and the salt solution (hereafter SDOC) in young Chinese fir (Cunninghamia lanceolata) plantations of subtropics, mature Chinese fir plantations and the natural forest. The results indicate that for young Chinese fir plantations, CDOC at the soil depth of 0-10cm and HDOC at the soil depth of 0-10cm and 10-20cm decreases significantly after soil warming, while SDOC does not differ much at all soil depths. For mature Chinese fir plantations, CDOC decreases significantly at the soil depth of 0-10cm and 10-20cm after soil warming. However, HDOC and SDOC does not differ much at all soil depths. For the natural forest, the concentration of DOC by these three methods reports no significant change at all soil depths after soil warming. The findings also reveal that under the condition of the soil warming, the concentration of DOC has a large change in young Chinese fir plantations at the surface soil and in mature Chinese fir plantations at the deep soil, while it changes the least in the nature fir forest. Hence, it provides references and data for further deep understanding of the impact of the future warming on dissolved organic carbon.