摘要
为了量化森林土壤N_2O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N_2O处理、添加N_2O好气鲜土处理、不添加N_2O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N_2O时具有较大的N_2O消耗潜势.在上述条件下进行培养的土壤N_2O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N_2O消耗,甚至出现N_2O排放现象(净通量高达2.19～2.38μg·g^(-1)·h^(-1));不添加外源N_2O也能显著降低土壤N_2O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N_2O消耗潜力(净通量约为-1.39μg·g^(-1)·h^(-1)).
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).
作者
朱思佳
马莹玲
高人
马红亮
尹云锋
杨柳明
ZHU Sijia;MA Yingling;GAO Ren;MA Hongliang;YIN Yunfeng;YANG Liuming(School of Geographical Science, Fujian Normal University, Fuzhou 350007;Fujian Provincial Key Laboratory for Plant Eco-physiology, Fuzhou 350007;Cultivation Base of State Key Laboratory of Humid Subtropical Mountain Ecology, Fuzhou 350007)
出处
《环境科学学报》
CAS
CSCD
北大核心
2019年第5期1673-1681,共9页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.31570607
31770659
41271282)
关键词
中亚热带
森林土壤
N2O消耗
反硝化作用
厌氧
the mid-subtropics
forest soil
N2O consumption
denitrification
anaerobic
