杨树人工林复合经营模式对土壤N2O与CO2排放的影响
Effects of compound management patterns in poplar plantations on the emissions of N2O and CO2 from the soil
宋子琪 1李野 1丁思惠 2田野 3方升佐3
作者信息
- 1. 南京林业大学林草学院, 南京 21003
- 2. 南京林业大学林草学院, 南京 21003;江苏省科技资源统筹服务中心, 南京 210008
- 3. 南京林业大学林草学院, 南京 21003;南京林业大学南方现代林业协同创新中心, 南京 210037
- 折叠
摘要
为探讨杨树人工林复合经营模式对土壤温室气体排放的影响,基于 11 年生"南林-895 杨"(Populus×euramericana'Nanlin-895')人工林,设置纯林、林下种植麦冬(Ophiopogon japonicas)和林下养鸡 3 种复合经营模式,采用静态箱-气相色谱法每月测定土壤N2O和CO2排放通量,同时测定土壤温湿度,分析复合经营模式对土壤N2O和CO2排放和产量的影响及与相关影响因子的关系.结果表明:不同复合经营模式林下土壤温、湿度存在显著差异;不同杨树复合经营模式间,土壤N2O和CO2 排放速率动态变化与年累积排放量存在显著差异,杨树林下种植麦冬的土壤N2O年累积排放量最高,为 233.47 mg·m-2·a-1,而林下养鸡的土壤CO2 年累积排放量最高,达 2328.87 g·m-2·a-1.总体来看,不同复合经营模式林地土壤温室气体(N2O 和 CO2)年累积排放量为林下养鸡>林下种植麦冬>杨树纯林;土壤温、湿度对土壤CO2 和N2O排放速率有显著影响,其中,土壤CO2 排放速率与土壤温度之间呈显著线型相关,而与土壤湿度呈现抛物线型关系;土壤N2O排放速率与土壤温、湿度的关系均可用抛物线型关系来描述.综上所述,不同杨树复合经营模式改变了林地土壤的温、湿度,进而对温室气体排放产生了显著的影响.从 1 年的研究结果看,种植麦冬和养鸡的杨树人工林林地土壤温室气体的年累积排放量高于纯林,表明林农复合经营增加了土壤温室气体的排放.
Abstract
To evaluate the effects of different compound management patterns on soil greenhouse gas emissions in poplar plantations,a field experiment was performed at the"Nanlin-895 Poplar"(Populus×euramericana'Nanlin-895')plantations of 11-year old.Three compound management patterns were conducted in this experiment as follows:pure poplar plantation(P),planting Ophiopogon japonicas under the plantation(L),raising chicken under the plantation(C).The characteristics of soil N2O and CO2 emission fluxes were monthly measured by static chamber technique,while the soil temperature and moisture were measured synchronously to analyze the impacts of compound management patterns on N2O and CO2 emissions and crop yield,as well as the relationships between the related impact factors.The results indicated that there were significant differences in soil temperature and moisture among the different management patterns,while the significant differences in the monthly emission rates and annual cumulative emissions of soil N2O and CO2 were also detected among different management patterns.The annual cumulative emission of soil N2O was the highest in the pattern of planting O.japonicus under poplar plantation,reaching 233.47 mg·m-2·a-1,whereas the annual cumulative emission of soil CO2 was the greatest in the pattern of raising chicken under poplar plantation,up to 2328.87 g·m-2·a-1.In general,the annual cumulative emission of soil greenhouse gases(N2O and CO2)in the different compound management patterns was as follows:raising chicken under the plantation>planting O.japonicas under the plantation>pure poplar plantation.Soil temperature and moisture had significant effects on soil CO2 and N2O emission rates,and there was a significant linear correlation between soil CO2 emission rate and soil temperature,while a parabolic relationship between soil CO2 emission rate and soil moisture.However,the relationships of N2O emission rate to soil temperature and moisture could be described by parabola.As mentioned above,different compound management patterns in poplar plantations modified the soil temperature and moisture,and then significantly affected the greenhouse gas emissions from the soils.Based on the results,the annual cumulative emissions of soil greenhouse gases in two agroforestry compound management patterns(planting O.japonicas in the plantation and raising chicken under the plantation)were higher than those in the pure plantation,indicating that poplar agroforestry patterns would increase the soil greenhouse gas emissions.
关键词
杨树人工林/气候变化/静态箱法/林农复合经营/温室气体Key words
poplar plantation/climate change/static chamber technique/agroforestry/greenhouse gas引用本文复制引用
基金项目
江苏省重点研发计划(BK20220017)
国家重点研发计划(2016YFD0600402)
江苏省大学生创新训练项目(201710298066Y)
出版年
2024
国家科技期刊平台
NSTL
万方数据