在青海省黄土丘陵区设立了72个山生柳标准样地,采集标准植株样品,测定其生物量,并研究了立地因子对区域山生柳生物量的影响。结果显示:样地山生柳生物量变幅较大,在0.34～31.19t/hm2,样地平均生物量为6.17t/hm2;山生柳地上部分生物量平均占总生物量的59.71%,地下部分平均占40.28%,不同土质类型中草甸土、灰褐土地区山生柳茎根比偏小,显示出山生柳根系的发育相对较强;山生柳林总生物量与盖度成正相关,与坡度、坡位没有明显正相关联系,在海拔为2 800～3 400m的陡坡、中坡位及阴坡条件下显示出明显的生长优势。
72 Salix oritrepha sample plots were set in loess hilly region of Qinghai province,samples were collected and the biomass were analyzed.The effects of site factors on the total biomass were analyzed systematically.Results showed that the biomass of Salix oritrepha forest had a large variation from 0.34t/hm2 to 31.19 t/hm2,the average biomass is 6.17t/hm2.The average percentage of biomass above the ground accounted for 59.71%of the total biomass,and underground part had an average of 40.28%,the proportion of stems and roots of Salix oritrepha in meadow soil and grey brown soil were smaller than other kinds of soil,which indicated strong root development.There was good positive relationship between the total biomass and the coverage,while there was no obvious relationship between the total biomass and slope gradient,or slope positions.Salix oritrepha showed obvious growth advantage at 2800 to 3400m elevation,steep slope,medium and shady slope .
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