CAJ | 학술논문

以大兴安岭落叶松林土壤为研究对象，设置8℃恒温和-5~8℃冻融循环（1个冻融循环为在-5℃培养24 h，后在8℃培养24 h）2个处理，进行30 d的室内培养实验，探讨了寒温带针叶林土壤在冻融交替时期的碳氮矿化过程及其相互关系。结果表明，培养温度和培养时间对土壤碳矿化速率和碳矿化累积量均有显著影响。第1次和第5次冻融循环后，冻融处理土壤的碳矿化速率显著高于恒温培养下土壤的碳矿化速率；第7次和第15次冻融循环后，冻融土壤碳矿化累积量显著低于恒温土壤的碳矿化累积量。土壤氮矿化速率没有受到培养温度、培养时间以及二者交互作用的影响，但培养时间和培养温度对土壤净氮矿化累积量有显著的影响。第5、7、15次冻融循环后，冻融处理的土壤无机氮净矿化累积量低于恒温培养的土壤无机氮净矿化累积量。经过30 d的培养，恒温处理下的土壤碳、氮矿化累积量（碳累积量：92.82μg·g-1，氮累积量73.76 mg·kg-1）是冻融处理下（碳累积量：65.51μg·g-1，氮累积量33.45 mg·kg-1）的1.42倍和2.21倍。土壤碳矿化累积量与土壤净氮矿化累积量均为正相关关系，但在相同的碳释放量下冻融循环处理土壤累积的无机氮较少。以上结果表明，冻融循环减少了大兴安岭寒温带落叶松林土壤碳排放和无机氮的累积，有利于土壤碳的固持和减少养分的流失。
이대흥안령락협송림토양위연구대상，설치8℃항온화-5~8℃동융순배（1개동융순배위재-5℃배양24 h，후재8℃배양24 h）2개처리，진행30 d적실내배양실험，탐토료한온대침협림토양재동융교체시기적탄담광화과정급기상호관계。결과표명，배양온도화배양시간대토양탄광화속솔화탄광화루적량균유현저영향。제1차화제5차동융순배후，동융처리토양적탄광화속솔현저고우항온배양하토양적탄광화속솔；제7차화제15차동융순배후，동융토양탄광화루적량현저저우항온토양적탄광화루적량。토양담광화속솔몰유수도배양온도、배양시간이급이자교호작용적영향，단배양시간화배양온도대토양정담광화루적량유현저적영향。제5、7、15차동융순배후，동융처리적토양무궤담정광화루적량저우항온배양적토양무궤담정광화루적량。경과30 d적배양，항온처리하적토양탄、담광화루적량（탄루적량：92.82μg·g-1，담루적량73.76 mg·kg-1）시동융처리하（탄루적량：65.51μg·g-1，담루적량33.45 mg·kg-1）적1.42배화2.21배。토양탄광화루적량여토양정담광화루적량균위정상관관계，단재상동적탄석방량하동융순배처리토양루적적무궤담교소。이상결과표명，동융순배감소료대흥안령한온대락협송림토양탄배방화무궤담적루적，유리우토양탄적고지화감소양분적류실。
To investigate the mineralization of soil carbon (C) and nitrogen (N) of cold-temperate coniferous forest soil and their relationships during freeze-thaw cycles, we collected Larix gmelinii forest soil in the Daxinganling region and conducted a 30d laboratory incubation experiment with two treatments of control (constant 8 ℃) and freeze-thaw (each cycle:-5 ℃ in 24 h and then 8 ℃ in 24 h). Our results showed that incubation temperature and time had significant effects on soil C mineralization rates and C mineralization accumulated. After the 1st and 5th freeze-thaw cycles the soil C mineralization rates were higher in the freeze-thaw treatment than in the control. The amounts of C mineralization accumulated in the freeze-thaw treatment were lower than those in the control after the 7th and 15th freeze-thaw cycles. Incubation temperature and time had no effect on soil N mineralization rates while the N mineralization accumulated was significantly affected by both two factors. After the 5th, 7th, and 15th freeze-thaw cycles the amounts of net N mineralization accumulated were higher in the control than in the freeze-thaw treatment. After 30d incubation the amounts of C and N mineralization accumulated were 1.42 and 2.21 times higher respectively in the control (C accumulated:92.82μg·g-1, N accumulated 73.76 mg·kg-1) as against the freeze-thaw treatment (C accumulated:65.51 μg·g-1, N accumulated 33.45 mg·kg-1). Net N mineralization accumulated was positively correlated with C mineralization accumulated in both control and freeze-thaw treatments. But with the same carbon emission, N mineralization accumulated was less in the freeze-thaw treatment compared with control. Consequently, freeze-thaw cycles can decrease C emission and inorganic N accumulation of the cold-temperate coniferous forest soil in the Daxinganling region, which might improve soil C storage and decrease nutrient loss.