应用生态学报2017，Vol.28Issue(6)：1743-1752,10.DOI:10.13287/j.1001-9332.201706.033
干湿交替对科尔沁沙地人工林叶凋落物分解和养分释放的影响
Effects of drying-rewetting on leaf litter decomposition and nutrient releases in forest plantations in Horqin Sandy Land, China
摘要
Abstract
Soil drying-rewetting is a common phenomenon in arid and semi-arid regions.Under the background of global climate change,it is predicted that the intensity of soil drying-rewetting cycle in Horqin Sandy Land will be further strengthened in the future.In this study,we conducted an insitu soil column incubation experiment for 180 days to investigate the effects of soil drying-rewetting on leaf litter decomposition and nutrient releases of Populus simonii and Pinus sylvestris var.mongolica in Horqin Sandy Land.There were three treatments:Constantly moist treatment (CM,60％ water holding capacity during whole incubation period),mild drying-rewetting treatment (DW1,gradual drought for 10 days plus 60％ WHC for 20 days) and heavy drying-rewetting treatment (DW2,gradual drought for 20 days plus 60％ WHC for 10 days).To evaluate their delayed effects,leaf litter in all three treatments were incubated for 60 days under same and constant humid condition (60％ WHC) after four cycles of soil drying-rewetting.The responses of litter decomposition to soil drying-rewetting cycles and nutrient releases of P.simonii and P.sylvestris var.mongolica were similar during the drying and rewetting period.Litter mass loss and the release of C,lignin and total phenol were decreased by 17.4％,23.8％,35.2％ and 32.7％ in DW2 treatment compared with CM reatment.There was no significant difference in release of leaf litter N or P among the drying-rewetting treatments.There were consistent changes of litter mass loss and nutrient releases among the treatments at the end of drying-rewetting and delayed incubation period.However,litter decomposition rate and litter C and lignin release rates were increased in DW2 treatment compared with CM treatment during the delayed incubation period,indicating a short-term delayed effect.关键词
干湿交替/凋落物分解/养分释放/半干旱区/科尔沁沙地Key words
drying-rewetting/litter decomposition/nutrient release/semi-arid region/Horqin Sandy Land引用本文复制引用
黎锦涛,孙学凯,胡亚林,赵珊宇,曾德慧..干湿交替对科尔沁沙地人工林叶凋落物分解和养分释放的影响[J].应用生态学报,2017,28(6):1743-1752,10.基金项目
本文由国家自然科学基金项目(41271318,41401262)资助 This work was supported by the National Natural Science Foundation of China (41271318,41401262). （41271318,41401262）
