论文部分内容阅读
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。
Infrared gas analysis was used to monitor the stem CO2efflux (Pinus massoniana) and Schima superba (Trichoderma spp.) Stem regeneration in plots of restoration of soil erosion in Changting, Fujian Province in summer and autumn 2008, rate, FCO2). The relationship between FCO2 and trunk temperature, air temperature, trunk flow density, air relative humidity, soluble sugar content and starch content were also analyzed. The results showed that both the FCO2 value and FCO2 daily variation of FCO2 in summer and autumn in Changting, Fujian Province, as well as the relationship between FCO2 and ecophysiological factors, were affected by vegetation restoration. The FCO2 of the plots increased significantly after vegetation reconstruction. The average recovery of FCO2 in summer and autumn was 1.18μmol / (m2.s), which was significantly lower than that in the high restoration plots of Masson pine and Schima superba FCO2 averaged 1.85 and 5.28μmol / (m2.s), respectively (p <0.05) .In summer, the daily variation of FCO2 was lower in the three-peaked plots than in the low-level plots, and its correlation with the trunk temperature, air temperature, (P <0.05). However, for the rest of the years, the daily variation of FCO2 in Pinus massoniana and Schima superba was bi-mode and had no significant correlation with physiological and ecological factors. After vegetation reconstruction, Environmental factors such as temperature, soil fertility and other environmental factors to improve the growth rate of plant trunks to speed up, is the main reason for the above differences between the FCO2.