福建长汀水土流失区重建植被马尾松和木荷夏秋季树干CO_2释放速率研究  

Stem CO_2 Efflux Rate of Pinus massoniana and Schima superba during Summer and Autumn in Vegetation Reconstruction of Soilerosion Area in Changting County,Fujian Province

作　　者：黄玮[1,2] 朱锦懋[1,2] 黄儒珠[1,2] 郑怀舟[1,3] 王健[1,3] 盛浩[1,3] 

机构地区：[1]湿润亚热带生态地理过程省部共建教育部重点实验室,福州350007 [2]福建师范大学生命科学学院,福州350108 [3]福建师范大学地理科学学院,福州350007

出　　处：《水土保持学报》2010年第3期222-227,共6页Journal of Soil and Water Conservation

基　　金：福建省自然科学基金项目(2009J01124);福建省教育厅B类基金项目(JB08058)资助

摘　　要：采用红外气体分析法,于2008年夏季和秋季,原位监测了福建长汀水土流失区不同恢复程度样地重建植被马尾松(Pinus massoniana)、木荷(Schima superba)树干CO2释放速率(stem CO2efflux rate,FCO2);并分析了FCO2与树干温度、气温、树干液流密度、空气相对湿度、树干可溶性糖和淀粉含量的关系。结果表明:植被重建对福建长汀水土流失区夏季和秋季FCO2值大小、FCO2日变化规律、以及FCO2与生理生态因子的关系均有不同程度的影响。植被重建后样地中植物FCO2显著提高,恢复程度低样地马尾松夏秋季节FCO2的平均值为1.18μmol/(m2.s),显著低于恢复程度高样地马尾松、木荷(夏秋季节FCO2平均值分别为1.85,5.28μmol/(m2.s)(p<0.05)。夏季,恢复程度低样地马尾松FCO2日变化规律为三峰型,且其与树干温度、气温、树干液流密度、空气相对湿度显著相关(p<0.05);但其余时间,两样地马尾松、木荷FCO2日变化均为双峰模式,与各生理生态因子相关性均不显著。植被重建后,样地中温度、土壤肥力等环境因子改善,使植物树干生长速率加快,是导致样地间FCO2存在以上差异的主要原因。By using infra-red gas analyzer（IRGA） method,stem CO2 efflux rate（FCO2） of Pinus massoniana,Schima superba under different habitats restored were measured in the soil erosion area of Changting county,Fujian province during summer and autumn.Stem temperature,air temperature,sap flow density,relative air humidity,stem soluble sugar and starch content were determined simultaneously.The result demonstrated that： vegetation reconstruction had effect on diurnal mean FCO2,characteristics of diurnal changes for FCO2,relationship between FCO2 and eco-physiology factors.There was a significant increase for diurnal mean FCO2 after vegetation reconstruction.The FCO2 of Pinus massoniana in low degree habitat was 1.18 μmol/（m2·s） during summer and autumn,was significantly lower than Pinus massoniana and Schima superba in high degree habitat（1.85 μmol/（m2·s） and 5.28 μmol/（m2·s）,respectively）（p0.05）.The diurnal variation of Pinus massoniana showed clearly three-peak pattern in low degree habitat in summer.At other time,the tendencies in diurnals of 2 tree species were double-peak pattern in different habitats restored.There was significant correlation between FCO2 and stem temperature,air temperature,sap flow density,relative air humidity for Pinus massoniana in low degree habitat in summer.But there was no correlation in FCO2 and these eco-physiology factors for Pinus massoniana and Schima superba in different habitats restored at other time.These differences in FCO2 between different habitats restored may be explained by environmental improvements after vegetation restoration,which resulted in the enhancement of growth rate of stem.

关 键 词：树干CO2释放速率 树干呼吸 植被重建 水土流失 福建长汀 

分 类 号：Q945[生物学—植物学] S718[农业科学—林学]