生态学杂志2017，Vol.36Issue(6)：1548-1554,7.DOI:10.13292/j.1000-4890.201706.021
冻融对温带森林土壤碳、氮矿化作用的影响
Effects of freezing-thawing on soil carbon and nitrogen mineralization in temperate forest ecosystems
摘要
Abstract
In mid-high northern latitude and high altitude regions,a phenomenon of soil freezingthawing cycles generally occurs in the late autumn and early spring.With the global warming,effects of such freezing-thawing cycles on the processes of soil carbon (C) and nitrogen (N) cycling are attracting more attention.In the present study,we collected soil samples from different types of forest in Changbai Mountain,including Pinus koraiensis,Betula platyphylla and Larix olgensis.We carried out a laboratory incubation experiment to investigate how freezing-thawing cycles (-10 to 10 ℃) affect soil C and N mineralization at low soil water content (40％) and high water content (supersaturation).The results show that freezing-thawing cycles significantly restricted C mineralization rate under different water conditions (except for the P.koraiensis soil at low soil water content).Such restriction was more pronounced with increase in the frequency of freezing-thawing cycles.Freezing-thawing cycles interacted with soil water content to affect soil N mineralization;they increased N mineralization rate at the low water content,whereas such influence was different at the high soil water content.These results indicate that freezing-thawing cycles in the late autumn and early spring significantly drove soil C and N mineralization in Changbai Mountain,the extent of which depended on freezing-thawing frequency and soil water content.关键词
冻融循环/土壤水分/碳/氮矿化/温带森林/长白山Key words
freezing-thawing cycle/soil water content/carbon and nitrogen mineralization/temperate forest/Changbai Mountain引用本文复制引用
赵媛,周旺明,王守乐,周莉,于大炮,代力民..冻融对温带森林土壤碳、氮矿化作用的影响[J].生态学杂志,2017,36(6):1548-1554,7.基金项目
中国科学院沈阳生态所特色研究所项目(Y5YZX151YD)和中国科学院重点部署项目(KFZD-SW-305)资助. （Y5YZX151YD）
