川西采伐迹地早期植被生物量与生产力动态初步研究

Vegetation Biomass and Biological Productivity Dynamics of Cutting-blanks in their Early Succession Stage in Western Sichuan

本文采用“空间代替时间”［１］的方法，对川西米亚罗林区采伐迹地早期天然植被生物量与生产力进行了测定与研究。结果表明：川西米亚罗林区采伐迹地天然植被恢复较快，伐后第１ 年植被总生物量为６５０．７ ｋｇ／ｈｍ ２，并以草本植物为主，到２９ 年时植被总生物量达５０ ２１０．４４ ｋｇ／ｈｍ ２，此时植被以乔木树种（红桦）占优势，并在演替中起主导作用。迹地早期被总生物量和乔木层生物量随迹地年龄增大而增加，灌木和草本层生物量基本成二次抛物线变化。文中还讨论了不同植被类型的生物生产力，迹地乔、灌、草生物量比的变化划分植被演替阶段。

The vegetation biomass and productivity of cutting blanks in their early sucession stage in Miyalo forest district are measured by using “space replacing time” method in this paper.The results have shown that the vegetation biomass of one year old cutting blank is 65.07 kg/hm 2 in which the herb biomass is important.The 29 years vegetation biomass will amount to 50210.44 kg/hm 2,in which the biomass is mainly contributed to tree species.The biomass of vegetation in cutting blank in its early succession stage increases with blank age,the biomasses of shrub and herb in cutting blank assume a quadratic parabola with age.The biological productivities of different vegetation types,the relations between the biomass,the coverage and densities of shrub and herb,and the ratios among the biomasses of tree layer,shrub and herb are also described in this paper.