Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Ying Yong Sheng Tai Xue Bao. 2021 Feb;32(2):495-502. doi: 10.13287/j.1001-9332.202102.030.
Based on 98 Chinese pine () tree-ring width data, normalized diffe-rence vegetation index (NDVI) data and land cover data in the Helan Mountains, we used VS-oscilloscope model to simulate the radial growth process of Chinese pine and to examine the relationship between vegetation canopy phenology and tree cambium phenology. Results showed that the end of season (EOS) of the vegetation canopy was significantly correlated with the EOS of the Chinese pine cambium. Such correlation was stronger than that between grassland and cambium. The start of season (SOS) and EOS of Chinese pine were related to the averaged minimum temperature in May-June and August-September, respectively. When the average minimum temperature in May-June increased by 1 ℃, SOS would be advanced by 4.3 days. The averaged minimum temperature in August-September increased by 1 ℃, EOS would be delayed by 2.6 days. The correlation between the phenology of vegetation canopy and the phenology of the cambium in Chinese pine differed among vegetation types. Simulating tree growth dynamics only through a tree-ring physiology model might lead to biased results. Using remote sensing monitoring data to combine canopy development and cambium growth would help to more accurately understand tree growth dynamics.
基于贺兰山 98 株油松（Pinus tabulaeformis）的树木年轮宽度、归一化植被差异指数（NDVI）和土地覆盖数据，我们使用 VS-示波器模型模拟了油松的径向生长过程，并检验了植被冠层物候与树木形成层物候之间的关系。结果表明，植被冠层的生长季末期（EOS）与油松形成层的 EOS 显著相关。这种相关性强于草地与形成层之间的相关性。油松的生长季初期（SOS）和生长季末期（EOS）与 5-6 月和 8-9 月的平均最低温度分别相关。当 5-6 月的平均最低温度升高 1°C 时，SOS 会提前 4.3 天。8-9 月的平均最低温度升高 1°C，EOS 会延迟 2.6 天。不同植被类型的植被冠层物候与油松形成层物候之间的相关性存在差异。仅通过树木年轮生理学模型模拟树木生长动态可能会导致结果出现偏差。使用遥感监测数据结合冠层发育和形成层生长将有助于更准确地了解树木的生长动态。
