应用生态学报2017，Vol.28Issue(6)：1786-1792,7.DOI:10.13287/j.1001-9332.201706.027
雪被去除对川西亚高山云杉林土壤活性氮的影响
Effects of snow removal on soil labile nitrogen in a subalpine spruce forest of western Sichuan, China
摘要
Abstract
Warming-induced decrease in seasonal snow cover has a great potential to affect soil nitrogen cycle in alpine cold forest ecosystems.In this study,a wooden-shelter method was used to remove the snow accumulation.Soil nitrogen pools and mineralization rates in the snow removal and control plots were measured synchronously in three critical periods (early snow cover,deep snow cover and snow cover melting) in a subalpine spruce forest of western Sichuan,China.Seasonal snow cover kept soil from cold air temperature.Snow removal decreased average and minimum soil temperatures (5 cm) by 0.33 and 1.17 ℃,respectively.In addition,snow removal caused a positive effect on soil frost depth and freeze-thaw cycle.There was a significant dynamic in soil labile nitrogen pool among different periods.Snow removal on average increased NH4+-N,NO3--N and dissolved organic nitrogen (DON) contents by 38.6％,23.5％ and 57.3％,respectively,over the winter.Moreover,snow removal increased soil net nitrification and mineralization rates in the snow cover melting period.Overall,warming-induced decrease in snow cover could stimulate winter soil nitrogen cycle of subalpine forests.关键词
雪被去除/冻融循环/铵态氮/硝态氮/硝化速率/矿化速率Key words
snow removal/freeze-thaw cycle/ammonium/nitrate/nitrification rate/mineralization rate引用本文复制引用
李志杰,杨万勤,贺若阳,庄丽燕,杨开军,刘群,李婷婷,徐振锋..雪被去除对川西亚高山云杉林土壤活性氮的影响[J].应用生态学报,2017,28(6):1786-1792,7.基金项目
本文由国家自然科学基金项目(31570601,31570445,31500509)、国家重点研发计划项目(2016YFC0502505-03)和中国博士后科学基金项目(2014T70880)资助 This work was supported by the National Natural Science Foundation of China (31570601,31570445,31500509),the National Research and Development Plan (2016YFC0502505-03),and the Post-doe Foundation Program of China (2014T70880). （31570601,31570445,31500509）
