我县城区有一处占地约1200平方米的古豪宅,院内生长着山茶、桂花、女贞等树木,每年山茶、桂花盛开季节,艳丽多彩,芳香泗溢,吸引许多人驻足观光。由于近年城区中心广场扩建,拆除了周边围墙和房屋,这些树木长势逐渐衰退,叶色枯黄,花小色淡,枯枝增多,许多人都感到十分惋惜。那么,造成这种现象的原因究竟是什么呢? My county has an area of ​​about 1,200 square meters of ancient mansion, the hospital is growing camellia, sweet-scented osmanthus, privet and other trees, annual annual camellia, sweet-scented osmanthus bloom season, colorful, fragrant Yi overflow, attracting many people stop sightseeing. Due to the expansion of the urban center plaza in recent years, the surrounding walls and houses have been demolished. These trees are gradually declining. The foliage is yellowish, the flowers are light and the dead branches increase. Many people feel very sorry. So what is the cause of this phenomenon?