在改造自然、驾驭自然的生产实践中,我国劳动人民创造和积累了人工修剪、控制树木生长的技术经验。这些技术经验,被现代科学技术所证明,并不断充实、提高和完整。自然界春、夏、秋、冬,循环往复。种子植物,在生存、繁衍和发展的过程中,经过大自然的严格选择,产生了适应自然气候变化的能力,出现春生、夏茂、秋实、冬眠的物候变化。我国劳动人 In the practice of transforming nature and mastering nature, the working people in our country have created and accumulated technical experience in artificial pruning and in controlling the growth of trees. These technical experiences have been proven by modern science and technology and are constantly enriched, enhanced and complete. Spring, summer, autumn, winter, the cycle of nature. Seed plants, in the process of survival, reproduction and development, have undergone a rigorous selection by nature and have developed their ability to adapt to the natural climate change. There are phenological changes in spring, summer, autumn and hibernation. China’s working people