秋茄红树林替代互花米草对土壤呼吸速率的影响  

作　　者：郭萍萍 

机构地区：[1]福建闽江河口湿地国家级自然保护区管理处,福建福州350200 [2]福建闽江河口湿地生态系统国家定位观测研究站(国家林业和草原局),福建福州350200 [3]福建农林大学菌草与生态学院,福建福州350002

出　　处：《环境保护与循环经济》2024年第10期54-58,74,共6页environmental protection and circular economy

基　　金：福建省红壤山地农业生态过程重点实验室开放课题“红树林湿地生态恢复过程中土壤温室气体排放规律及其影响因素研究”(Aephers-202301);福建省植物生理生态重点实验室开放课题“秋茄土壤CO_(2)和CH4排放的季节性变化规律研究”(2023ZWST001);福州市自然保护地科研监测项目“生态修复对闽江河口湿地碳汇功能变化的影响——以‘退养还湿’和红树林恢复为例”(2023RZRBHD03)。

摘　　要：土壤呼吸是大气CO_(2)的重要来源,对全球气候变化具有重要的影响。以闽江河口互花米草和治理后恢复的秋茄红树林湿地土壤为研究对象,开展秋茄红树林替代互花米草对土壤呼吸速率影响的研究。结果表明:互花米草和秋茄红树林土壤呼吸速率均呈单峰型,夏季最高,具有明显的季节变化趋势。秋茄红树林替代互花米草没有改变土壤呼吸速率季节性变化趋势,但是显著降低了土壤呼吸速率(p<0.05)。土壤呼吸速率与气温、土壤温度呈极显著正相关(p<0.01),与含水量呈极显著负相关(p<0.01)。互花米草土壤呼吸速率与空气湿度、秋茄红树林土壤呼吸速率与土壤pH呈极显著负相关(p<0.01)。Soil respiration is an important source of atmospheric CO_(2) and has an important impact on global climate change.In this study,it examined the effects of Kandelia obovata(K.obovata)mangrove substitution for Spartina alterniflora(S.alterniflora)on soil respiration rate by taking the wetland soil of S.alterniflora and restored K.obovata mangrove of Minjiang River Estuary after treatment as research objects.The results showed that the soil respiration rate of S.alterniflora and K.obovata mangrove showed a single peak occurring in summer with obvious seasonal variation trend.The replacement of S.alterniflora by K.obovata mangrove did not change the seasonal variation trend of soil respiration rate,but significantly reduced the soil respiration rate(p<0.05).The soil respiration rate was significantly positively correlated with air temperature and soil temperature(p<0.01),and significantly negatively correlated with water content(p<0.01).The soil respiration rate of S.alterniflora was negatively correlated with air humidity,which was the same as that of K.obovata mangrove with soil pH(p<0.01).

关 键 词：土壤呼吸速率 秋茄红树林 互花米草 闽江河口 

分 类 号：X171.1[环境科学与工程—环境科学]