模拟酸雨对南亚热带典型森林土壤N_(2)O排放的影响  

Effects of simulated acid rain on soil N_(2)O emission from typical forest in subtropical southern China

作　　者：曹亚玲 俞梦笑 江军 曹楠楠 赵梦頔 王琛 张德强[1] 闫俊华[1] CAO Ya-ling;YU Meng-xiao;JIANG Jun;CAO Nan-nan;ZHAO Meng-di;WANG Chen;ZHANG De-qiang;YAN Jun-hua(Key Laboratory of Vegetation Restora-tion and Management of Degraded Ecosystems,South China Botanical Garden,Chinese Academy of Sciences,Guangzhou 510650,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院华南植物园,退化生态系统植被恢复与管理重点实验室,广州510650 [2]中国科学院大学,北京100049

出　　处：《应用生态学报》2021年第4期1213-1220,共8页Chinese Journal of Applied Ecology

基　　金：中国科学院战略性先导科技专项(XDA13010302);国家杰出青年科学基金项目(41825020);国家自然科学基金项目(31901296);中国博士后科学基金项目(2020M672863)资助。

摘　　要：基于长期模拟酸雨森林样地,利用箱式法同步测定了不同酸雨强度处理下森林土壤N_(2)O排放通量,研究了模拟酸雨对我国南亚热带针阔叶混交林和季风常绿阔叶林两种代表性森林土壤N_(2)O排放的影响。结果表明:连续5年(2014—2018年)观测周期内,两种林型土壤N_(2)O排放通量在各模拟酸雨处理下均表现出明显的季节变化特征,湿季排放通量高于干季,并且年际变化较大。受2017—2018年度降水减少的影响,此期间两种林型土壤N_(2)O排放通量普遍较低。两种林型土壤N_(2)O排放通量与土壤温度和土壤湿度呈显著正相关。季风常绿阔叶林对照样方土壤N_(2)O排放通量为12.6μg N_(2)O m^(-2)·h^(-1),与对照相比,pH 3.5和pH 3.0条件下土壤N_(2)O排放通量分别上升42.9%和61.1%,模拟酸雨显著增加了季风常绿阔叶林土壤N_(2)O排放通量;模拟酸雨同样有促进针阔叶混交林土壤N_(2)O排放的趋势,但各处理间差异不显著。在酸雨依旧严峻的形势下,我国南亚热带典型森林土壤N_(2)O排放通量将增加,且不同林型的增幅不同。Based on a long-term simulated acid rain experiment,soil N_(2)O emission fluxes were measured using static chambers and the gas chromatography method in a coniferous and broadleaved mixed forest and a monsoon evergreen broadleaved forest in southern China.During the five-year observation periods(2014-2018),soil N_(2)O emission fluxes in the two forests showed obvious seasonal variation.The soil N_(2)O emission fluxes in wet season were significantly higher than that in dry season,with a large annual variation.Due to the decreases of precipitation,soil N_(2)O emission fluxes of the two forests in 2017 and 2018 were generally low.Soil N_(2)O emission flux was positively correlated with soil temperature and soil moisture.In the monsoon evergreen broadleaved forest,soil N_(2)O emission flux in the control plot was 12.6μg N_(2)O·m^(-2)·h^(-1).Soil N_(2)O emission fluxes under the pH 3.5 and pH 3.0 treatments increased by 42.9%and 61.1%,respectively.Soil N_(2)O emission was significantly increased under simulated acid rain in the monsoon evergreen broadleaved forest.Acid rain promoted soil N_(2)O emission in the coniferous and broadleaved mixed forest,but without significant difference among the treatments.Under the scenario of increasing acid rain,soil N_(2)O emission fluxes in typical subtropical southern China forests would increase,and the magnitude of such increase was different among forest types.

关 键 词：土壤N_(2)O排放 模拟酸雨 南亚热带森林 

分 类 号：S714[农业科学—林学]