施石灰对杉木人工林土壤呼吸及其温度敏感性的影响  

Effects of liming on soil respiration and its sensitivity to temperature in Cunninghamia lanceolata planta⁃tions

作　　者：田宁 黄雪梅 陈龙池[2,3] 黄苛 陶晓 TIAN Ning;HUANG Xuemei;CHEN Longchi;HUANG Ke;TAO Xiao(College of Forestry and Landscape Architecture,Anhui Agricultural University,Hefei 230036,China;Huitong Experimental Station of Forest Ecology,Key Laboratory of Forest Ecology and Management,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China;Hunan Key Laboratory for Structure and Ecosystem Service of Subtropical Forest,Huitong 418300,Hunan,China)

机构地区：[1]安徽农业大学林学与园林学院,合肥230036 [2]中国科学院沈阳应用生态研究所,中国科学院森林生态与管理重点实验室,中国科学院会同森林生态实验站,沈阳110016 [3]亚热带森林生态系统结构与服务功能湖南省重点实验室,湖南会同418300

出　　处：《应用生态学报》2023年第5期1194-1202,共9页Chinese Journal of Applied Ecology

基　　金：国家重点研发计划项目(2022YFF1303003);郴州国家可持续发展议程创新示范区建设专项(2021sfq19-1);国家自然科学基金项目(42077094,U22A20612)资助。

摘　　要：我国酸沉降主要分布区域与杉木人工林主要分布区域重合,石灰添加是改良酸化土壤的有效措施。为探究酸沉降背景下施石灰对土壤呼吸及其温度敏感性的影响,本研究以杉木人工林土壤为对象,在2018年6月一次性添加0、1和5 t·hm^(-2)的氧化钙,于2020年6月开始进行为期一年的原位土壤呼吸速率观测。结果表明:与不施石灰相比,施石灰显著提高了土壤pH值和交换性Ca^(2+)含量,不同石灰施用量之间无显著差异。杉木人工林土壤呼吸及其组分具有明显的季节差异,表现为夏季最高,冬季最低,施石灰未显著改变其季节动态特征。施石灰显著降低了土壤异养呼吸速率,提高了自养呼吸速率,最终导致施石灰对土壤呼吸无显著影响。土壤呼吸月动态变化与温度月动态变化基本保持一致,土壤呼吸与土壤温度呈显著的指数关系,施石灰后土壤呼吸及自养呼吸的温度敏感性(Q_(10))呈上升趋势,土壤异养呼吸的Q_(10)呈下降趋势。综上,施石灰提高了杉木人工林土壤自养呼吸,显著降低了土壤异养呼吸,这有利于杉木人工林土壤固碳。The primary distribution area of acid deposition coincides with areas of Chinese fir(Cunninghamia lan⁃ceolata)plantations.Liming is an effective method of restoring acidified soil.To understand the effects of liming on soil respiration and temperature sensitivity within the context of acid deposition,we measured soil respiration and its components in Chinese fir plantations for one year beginning in June 2020,with 0,1 and 5 t·hm^(-2) calcium oxide being added in 2018.The results showed that liming considerably increased soil pH and exchangeable Ca^(2+) concen⁃tration,and that there was no significant difference among different levels of lime application.Soil respiration rate and components in the Chinese fir plantations exhibited seasonal variations,with the highest values during the sum⁃mer and the lowest values during the winter.Although liming did not alter seasonal dynamics,it strongly inhibited heterotrophic respiration rate and increased autotrophic respiration rate of soil,with minor effect on total soil respi⁃ration.The monthly dynamics of soil respiration and temperature were largely consistent.There was a clear exponen⁃tial relationship between soil respiration and soil temperature.Liming increased temperature sensitivity Q_(10) of soil respiration and autotrophic respiration but reduced that of soil heterotrophic respiration.In conclusion,liming pro⁃moted soil autotrophic respiration and strongly inhibited soil heterotrophic respiration in Chinese fir plantations,which would facilitate soil carbon sequestration.

关 键 词：施石灰 土壤呼吸 温度敏感性 土壤异养呼吸 杉木人工林 

分 类 号：S714.6[农业科学—林学]