Comparison of Canopy Phenology and Productivity in Two Tropical Forests from Southwestern China and Northern Thailand
Authors:
- Boonsiri SawasdchaiBoonsiri Sawasdchai
- Montri SanwangsriMSMontri Sanwangsri
- Phongthep HanpattanakitPHPhongthep Hanpattanakit
- Patipat VongruangPVPatipat Vongruang
- Pimsiri SuwannapatPSPimsiri Suwannapat
- Amnat ChidthaisongACAmnat Chidthaisong
- Sirinthornthep TowprayoonSTSirinthornthep Towprayoon
- Wittanan TammadidWTWittanan Tammadid
- Yaqi LiuYLYaqi Liu
- Huixu ZhengHZHuixu Zheng
- Jing ZhangJZJing Zhang
- Linjie JiaoLJLinjie Jiao
Open Access
- 1 December 2024
- journal article
- Published by China Science Publishing & Media Ltd. in EARTH AND ENVIRONMENT
Abstract
为了探究物候指数与涡度相关技术获取的通量数据之间的关系,本研究比较了中国西南部热带雨林(BNS)和泰国干性龙脑香林(DPT)通量塔获取的两年的监测数据。研究周期从2020年1月到2022年4月。基于红、绿、蓝数字值(RGBDN)提取的冠层颜色指数分为RGB色坐标(RGBCC;RCC、GCC、BCC)、绿色绝对指数(GEI)、植被对比指数(VCI)的RGBratio、绿红比(GRr)和红蓝比(RBr)。结果显示,植被指数呈现明显的季节变化,表征了热带森林的物候特征。在BNS站点,植被指数与总初级生产力(GPP)呈显著正相关关系(GRr: R2=0.91, GEI: R2=0.90, GCC:R2=0.88, VCI: R2=0.87; P<0.05),而DPT站点显示出比BNS更弱的关系(VCI: R2=0.77, GCC: R2=0.77, GEI: R2=0.71, GRr: R2=0.45)。BNS(热带雨林)对物候变化的敏感性高于DPT(干性龙脑香林),同时热带雨林的GPP (5.92~7.79 gC/(m2·day)) 高于干性龙脑香林的 (4.64~5.63 gC/(m2·day)) 。土壤温度可能是驱动BNS物候变化的重要因素,而相对湿度可能对DPT森林的物候具有更重要的影响。 长期数字相机观测为GPP评估和理解树冠物候对气候变化响应提供了宝贵数据,未来研究应加强对热带森林生态系统冠层物候变化和生态系统碳交换量的定量关系的理解。Keywords
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