典型岩溶区土壤呼吸作用的昼夜变化特征及其影响因素  

Diurnal variation characteristics of soil respiration and influencing factors in the Maocun karst area, Guilin

作　　者：吴夏[1] 潘谋成[1] 曹建华[1] 朱晓燕[1] 张美良[1] 杨会[1] 唐伟[1] 蓝高勇 WU Xia;PAN Moucheng;CAO Jianhua;ZHU Xiaoyan;ZHANG Meiliang;YANG Hui;TANG Wei;LAN Gaoyong(Institute of Karst Geology,CAGS/Key Laboratory of Karst Dynamics,MNR&GZAR,Guilin,Guangxi 541004,China)

机构地区：[1]中国地质科学院岩溶地质研究所/自然资源部广西岩溶动力学重点实验室

出　　处：《中国岩溶》2019年第2期157-163,共7页Carsologica Sinica

基　　金：国家自然科学基金项目(41501222,41530316,41701235);广西自然科学基金项目(2014GXNSFBA118227,2018GXNSFAA281320)

摘　　要：为揭示桂林毛村岩溶地区夏季表层土壤呼吸作用昼夜演变规律。本次研究选用静态暗箱/气相色谱法,监测了无降水影响下毛村岩溶区域的表层土壤呼吸通量的昼夜变化规律。同时野外监测表层土壤的温度、大气温度、大气压强等环境参数,以综合分析影响土壤呼吸作用昼夜变化的关键环境因子。结果表明:受到大气温度变化的影响,研究区域土壤表层温度呈现单峰型的昼夜变化规律,表层土壤呼吸作用也存在明显的昼夜变化特征。土壤呼吸最大值出现在12:40至14:40,最小值出现在4:40-6:40。土壤呼吸作用强度和变幅均是白天大于夜间。大气温度与土壤呼吸作用呈显著正相关关系(P<0.01),说明在土壤含水量未超过阀值时,大气温度是影响土壤呼吸作用昼夜变化的关键环境因子。本次研究明确了土壤呼吸作用在昼夜变化上的变异性,对精确估算整个生态系统的碳收支有重要意义。This work aimed to reveal the circadian variation of soil respiration in the karst surface zone during summer in the Maocun karst area,Guilin.Using the static camera obscura/gas chromatography,soil respiration diurnal change in the study area was monitored in the background without precipitation.Meanwhile oil temperature,atmospheric temperature,pressure and other the environmental parameters were measured.By virtue of these data,main controlling factors of soil respiration were analyzed statistically.Results show that diurnal variation of soil surface temperature has a single peak which is affected by the change of atmospheric temperature.Soil respiration also displays obvious diurnal change in the study area.The maximum soil respiration appears at 12:40 to 14:40,and the minimum value appears 4:40 to 6:40.The intensity and amplitude of soil respiration in the day are greater than the night.The diurnal variation of soil respiration is mainly influenced by atmospheric temperature in the condition without precipitation.Therefore,atmospheric temperature is the primary controlling factor of soil respiration on a short- term scale.These results can help accurately estimate the carbon budget of the whole ecosystem.

关 键 词：岩溶表层带 土壤呼吸作用 昼夜变化 响应滞后 

分 类 号：S154[农业科学—土壤学]