雷州半岛实荣村风水林植物调查及现状分析

断奶日龄的选择对养猪生产至关重要。在现代养猪生产中，早期断奶是制约规模化养猪的瓶颈问题，往往造成仔猪断奶后食欲差、消化不良、腹泻、免疫功能下降等“仔猪早期断奶综合症”，严重制约养猪业的发展，而产生这一后果的主要原因是断奶使肠粘膜屏障受损。因此，选择适宜的仔猪断奶日对养猪生产具有重要的意义。本文综述了断奶日龄对仔猪生产性能和肠粘膜屏障的影响，以期为实际生产中确定适合的断奶日龄提供参考依据。

South Subtropical Crop Research Institute, CATAS, Zhanjiang, Guangdong 524091

Shirong Village is located in the Leizhou Peninsula and preserves about 10 hectares of natural secondary forest in its vicinity as geomantic woods based on local customs. There are two types of geomantic woods in the village, geomantic woods in village homestead and geomantic woods in cemetery. The former geomantic woods were fully conserved with a complete structure of plant populations, abundant tree species and more virgin big trees and old trees, whereas the latter had a simple plant structure with luxuriant shrubs, grasses and climbing vines and fewer big trees. The plant species of the geomantic woods in the Shirong Village are abundant, totaling 183 species under 70 families, with distinct plant flora in the tropics and pantropics, indicating an obvious transit from subtropics to tropics. The geomantic woods in the Shirong Village is a repository of native plant species and local Chinese medicinal plants in Leizhou Peninsula, China.