摘要
利用Granier热消散探针法(Thermal dissipation probes,TDP),对我国南亚热带鼎湖山针阔叶混交林中马尾松Pinus massoniana的树干液流变化进行了监测,结合同步监测的光合有效辐射、空气相对湿度、空气温度等环境因子进行了分析。研究表明:1)马尾松树干液流速率的日变化呈单峰型曲线,日间中午(13:00—14:00)的树干液流速率最高,湿季最高峰值为25.24 g·m^(-2)s^(-1),干季最高峰值为17.75 g·m^(-2)s^(-1),夜间也存在微量树干液流;2)马尾松树干液流速率主要受光合有效辐射和水汽压亏缺(vapor pressure deficiency,VPD)的影响,湿季中光合有效辐射起主要作用(P<0.001),干季中水汽压亏缺起主要作用(P<0.001);在干湿两季,树干液流速率滞后于光合有效辐射,提前于水汽压亏缺;3)湿季的蒸腾量显著高于干季(P<0.001);与森林恢复初期的马尾松树干液流相比,本地区树干液流速率相对较低,表明随着演替的进行,马尾松树干液流速率下降;4)研究结果揭示了华南地区的群落先锋树种马尾松在演替中期时的水分利用特征,对该地区森林恢复和生态环境建设提供了理论依据。
The sap flow density of Pinus massoniana was monitored by means of Granier’s thermal dissipation probes method in a mixed conifer-broadleaf forest at mid-succession stage in Dinghushan mountain,south China.The environmental factors,such as photosynthetically active radiation (RPAR),air temperature (T) and relative air humidity (HRAH) etc.,were recorded synchronously.The findings are as follows:1) The diurnal variation of sap flow rate of P.massoniana showed a single peak curve;the sap flow rate was the highest at noon (13:00 ~ 14:00),the highest in wet season was 25.24 g·m^-2s^-1,and the highest in dry season was 17.75 g·m^-2s^-1;There were also trace sap flow at night.2) The RPTSF of P.massoniana was mainly affected by RPAR and vapor pressure deficiency (DVPD);RPAR played a main role in the wet season (P < 0.001) and DVPD played a main role in the dry season (P < 0.001);In the dry and wet seasons, the RPTSF lagged behind the RPAR,while the RPTSF was earlier than the DVPD.3) The transpiration in wet season was significantly higher than in dry season (P < 0.001);Compared with P.massoniana in the early stage of re-vegetation,the sap flow in this area was lower, which indicated that the sap flow of P.massoniana decreased as the succession progressed.4) The results revealed the characteristics of water use in the middle succession of P.massoniana,the pioneer species in south China,and provided a theoretical basis for forest restoration and ecological environment construction.
作者
王立景
邓永红
曾小平
刘世忠
孟泽
李跃林
WANG Lijing;DENG Yonghong;ZENG Xiaoping;LIU Shizhong;MENG Ze;LI Yuelin(South China Botanical Garden,Chinese Academy of Sciences,Guangzhou 510650,Guangdong,China;Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2019年第3期82-90,共9页
Journal of Central South University of Forestry & Technology
基金
国家自然科学基金项目(31670453
41430529)
广东省自然科学基金项目(2014A030313746)
关键词
马尾松
针阔混交林
群落先锋树种
树干液流
演替中期
水分利用特征
鼎湖山国家级自然保护区
广东省肇庆市
Pinus massoniana
coniferous and broad-leaved mixed forest
community pioneer tree species
stem sap flow
midsuccessionstage
water utilization characteristics
Dinghushan Mountain National Nature Reserve
Zhaoqing city,Guangdong province
