关键词: 仔幼犬, 仔幼犬, 死因, 治疗, 提高成活率, 措施

Abstract:

Based on the riparian forest in the anabranch of wenyu river’s upstream, the standing stock of litters in three different types of riparian forest (pure L. principis-rupprechti forest, pure spruce forest and mixed forest of principis-rupprechti with spruce) had been identified. The method which combined field investigation, sample collection, fixed position test with laboratory analysis was employed to study the extant amount and composition of the litter in the different riparian forest and the decomposition condition of standing stock of litters in forestry community was analyzed. The result showed that the extant amount of litter in different types of forest, and the different components of standing stock of litters showed various patterns. The pure L. principis-rupprechti forest had most standing stock of litters, followed by the mixed forest, and the pure spruce forest had the litters. The amount of defoliation occupied the absolute superiority in three different types of forest. The bioclast as a main composition made up the humus layer, and the average thickness of the bioclast layer was 5.7 cm in pure L. principis-rupprechti forest, 5.1 cm in pure spruce forest, and 6.3 cm in the mixed forest. Sorting the forest stands by thickness of the bioclast layer from greatest to least, was the mixed forest, the pure L. principis-rupprechti forest, and the pure spruce forest. There also showed significant difference among the standing stock of litters in different types of forest, in different seasons, in different tree species and different habitats.