朱思佳,马莹玲,高人,马红亮,尹云锋,杨柳明.中亚热带森林土壤N2O消耗潜势及其控制因素研究[J].环境科学学报,2019,39(5):1673-1681
中亚热带森林土壤N2O消耗潜势及其控制因素研究
- N2O consumption potentials and controlling factors in forest soils of mid-subtropical China
- 基金项目：国家自然科学基金（No.31570607，31770659，41271282）
- 朱思佳
- 福建师范大学地理科学学院, 福州 350007
- 马莹玲
- 福建师范大学地理科学学院, 福州 350007
- 高人
- 1. 福建师范大学地理科学学院, 福州 350007;2. 福建省植物生理生态重点实验室, 福州 350007
- 马红亮
- 1. 福建师范大学地理科学学院, 福州 350007;2. 湿润亚热带山地生态国家重点实验室培育基地, 福州 350007
- 尹云锋
- 1. 福建师范大学地理科学学院, 福州 350007;2. 湿润亚热带山地生态国家重点实验室培育基地, 福州 350007
- 杨柳明
- 1. 福建师范大学地理科学学院, 福州 350007;2. 湿润亚热带山地生态国家重点实验室培育基地, 福州 350007
- 摘要：为了量化森林土壤N2O消耗潜势并探讨其可能控制因素，选取中亚热带4种典型森林（建瓯的杉木人工林、罗浮栲天然林、米槠林及武夷山的米槠林）植被覆盖下的土壤，设置8个处理（预处理、基线处理、添加葡萄糖处理、添加NO3-处理、非淋洗处理、不添加N2O处理、添加N2O好气鲜土处理、不添加N2O好气鲜土处理）进行室内培养实验.结果表明，厌氧条件下，在水分饱和、氮有效性低及添加外源N2O时具有较大的N2O消耗潜势.在上述条件下进行培养的土壤N2O净通量在4种森林类型之间与两个土层之间均具有显著差异.添加外源硝态氮能显著降低土壤N2O消耗，甚至出现N2O排放现象（净通量高达2.19~2.38 μg·g-1·h-1）；不添加外源N2O也能显著降低土壤N2O消耗.建瓯米槠林表层土具有较大的TC、TN及NH4+含量，结果表明，该种土壤具有较大的N2O消耗潜力（净通量约为-1.39 μg·g-1·h-1）.
- Abstract：The N2O consumption potentials and the possible controlling factors were investigated for the soils growing four typical forests, including one natural forest dominated by Castanpsis carlesii (WCC) located at Wuyi Mont Nature Reserve and two natural forests dominated by Castanpsis carlesii (JCC) or by Castanopsis fabri (JCF) and a plantation of Cunninghamia lanceolata (JCL) at Jianou Wanmulin Nature Reserve, in the mid-subtropical regions of Southeastern China, with 8 treatments set up in the laboratory incubation experiments such as one pretreatment and other seven treatments of baseline, glucose-amended, NO3--amended, unleached, no N2O amended,N2O amended aerobic fresh soil, no N2O amended aerobic fresh soil. The large potential consumption of N2O occurred under conditions of anaerobic, moisture saturation, low nitrogen availability and N2O amendment,which were shown significant difference among the four forest types and between the two soil layers. The nitrate amendment treatment could significantly reduce soil N2O consumption, even presented N2O emission phenomenon (net flux as high as 2.19~2.38 μg·g-1 h-1). The no N2O amendment treatment could also significantly reduced soil N2O consumption. The surface soil of JCC, with larger contents of total carbon, total nitrogen and ammonium nitrogen,had a larger N2O consumption potential (net flux of about -1.39 μg·g-1 h-1).
