关键词: 多源遥感数据, 无人机, 叶面积指数, 植被指数, 经验回归模型, 反演

Abstract: Quercus wutaishanica seeds were collected from Liupan Mountains of Ningxia, Northwest China to study their germination under effects of different soil burial depths (0, 30, and 50 cm) and durations (2, 4, 6, 8, 10, and 12 weeks), aimed to explore the safe storage condition and long storage potential of the seeds and to provide reference for the seedling reproduction of Q. wutaishanica and the recovery of degraded Q. wutaishanica shrubs. During the early period (two weeks) of soil burial, the seed germination of Q. wutaishanica was inhibited, but with the extending of burial duration, the germination percentage increased, germination rate accelerated, and germination index and vigor index presented a fluctuated increase. After burial for 12 weeks, the germination percentage of the seeds buried under 30 cm and 50 cm soil depths was 90.1% and 96.8%, respectively. The seed rot rate was increased with increasing burial depth and extending burial duration. After buried for 2 weeks, the seeds germinated spontaneously. After 12 weeks burial, the germination percentage of the seeds buried under 30 cm and 50 cm depths was 24.5% and 43.0%, respectively.

Key words: multi-source remote sensing data, unmanned aerial vehicle (UAV), leaf area index (LAI), vegetation index, empirical regression model, retrieving.