四川盆地丘陵及盆周低山区杉木实生林生长特点及提高产量的途径

四川盆地丘陵及盆周低山区杉木实生林受气候等环境条件的影响,速生期早而短,若立地条件差则很多林木因早熟而达不到培育目标。本研究在调查杉木主要分布区林分生长状况基础上,通过树干解析、生长过程对比分析,弄清了该地区杉木林分速生期持续的年限,并提出了以间作、合理施肥、合理密植为提高产量的主要措施。试验证明,这些措施具有明显的效果,既改良了林地土壤的理化性质、提高了土壤肥力,又延长了林分的速生期,提高林分蓄积并改善了木材的规格质量,其经济效益和社会效益都十分明显。

The Growing Characteristics and the Way to Promote the Growing Stock of Chinese fir Seedling Crop in Sichuan Basin Hillock Areas and the Lower Alti-tude Areas around the Basin.

The fast growing period of Chinese fir ( Cunninghamia Lanceolata Hook) seedling crop emerges early and Lasts shortly in Shichuan basin and the lower altitude areas around the basin, resulted from the influence of climate and other environment conditions, even it's hardly to reach the aim of silviculture at the sites with bad condition because trees will be premature. Based on the investigation of growing situation about Chinese fir standing in it's main distribution areas , how many years the fast growing period could last in those areas was clearly made by means of stem analysis, comparative analysis of growing process. and the main measures to promote growing stock are suggested, they were intercropping, reasonable fertilizing and rationalized dense planting respectively. The Testing results proved that there were significant effects in ameliorating the physical and the chemical properties of forest soil. improving the soil fertility, prolonging the fast growing period of stand, promoting the growing stock and the timber standars, and gaining so significant economic and social benefits by applying these measures.