青海黄土丘陵区退耕还林地沙棘林生物量研究

基于标准株全收获法和平均生物量法，对青海黄土丘陵区退耕还林地沙棘林生物量进行研究．结果表明，生物量变幅在2953．18～9018．92kg／hm2，10a沙棘〉8a沙棘〉3a沙棘，地上部分占56．32％～72．65％，地下部分占27．35％～43．68％，各器官生物量顺序是根〉枝〉干〉叶，生物量随树龄的增长符合Logistic生长模型．降雨量与生物量变化一致，水分有效性高的种群觅养生长格局倾向于聚集型，水分有效性低的种群觅养生长格局倾向于游击型．

Biomass of Hippophae rhamnoides Forest on Converted Land in Loess Hilly Plateau of Qinghai Province

Based on the harvesting of standard trees and the average biomass method in sample plots, biomasses of Hippophae rhamnoides L. -forest on converted land was studied in hilly loess plateau in Qing- hai province. The results showed that its biomass ranged from 2953. 18kg/hm2 to 9018.92kg/hm2 , lOa 〉8a 〉3a. The ration of the biomass of above ground parts is 56.32% -79.65% , and the others is 27.35% -43.68%. The biomass distributing sequence of different organs is root 〉 trunk 〉 branches 〉 Leaves. Rainfall and biomass changes were consistent. The index of clonal growth form of the population at high level of soil moisture supply were higher than that of the population at low level of soil moisture supply.