青海东部黄土丘陵区沙棘薪炭林研究简报

中国沙棘是青海东部黄土丘陵区最重要的薪炭林树种之一，研究表明：７年生中国沙棘薪炭林年均生物量达到最高峰，年均生长量为３．７５ｔ／ｈｍ＾３；生物量成熟龄为９年，地上部分蓄积量为２２．６４ｔ／ｈｍ＾２。沙棘薪材热值与其不同生长阶段关系密切。在速生期热值低，苗期和成熟期薪材热值高，平均为９５．１０ｋｊ／ｇ。根据立地生产力水平可将沙棘薪炭林立地条件划分为优良，较好，一般和不适宜四个类型。

STUDY ON HIPPOPHAE RHAMNOIDES FUEL WOODS IN LESS REGION OF EASTERN QINGHAI

Hippophae rhamnoides is one of the most important fuel wood in less regionof eastern Qinghai. The result shows that the peak of average biomass'is in seven years afterplanting,the annual biomass is 3. 75t/hm2. y,the adult in biomass periodis gotten nine years' later, the biomass on ground is 22. 64t/hm2 at same period. The relationship between en-erge of H. and different stage of growth is very high,it is lowcr at rapid growth stage, andhigher at yong and adult stage, the average energe is 95. 10kj/g. The site can be classified infour types: good,better, average and unfitable according to preduction.