【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NO^-₃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2.19～2.38μg·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NH⁺₄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-1.39μg·g^-1·h^-1).更多还原

【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, NO^-₃-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).更多还原