中国南部天然常绿阔叶林的地上生物量、净初级生产力、养分分布和养分利用效率

Above-ground Biomass,Net Primary Production,Nutrient Distribution and Nutrient Use Efficiency in Natural Evergreen Broad-leaved Forest in Southern China

在中国南部的江西九连山自然保护区,观测研究了天然常绿阔叶林的地上生物量、地上NPP(净初级生产力)、养分的积累和分布,以及不同生活型树种的养分利用效率。在两个样地,用相对生长回归法和收获法测定了地上生物量,数值各约为340和270t/hm 2,其中叶生物量约为9.6t/hm 2。地上NPP约为年9.9t/hm 2,其中叶生产力占44%。各种一般养分(N,P,K,Ca,Mg,Na)在森林生态系统中积累的特点是,Na和N在矿质土壤中有高的相对分布,K和Mg属中间地位,Ca和P则高分布于地上生物量中。氮的养分利用效率(NUE)、平均停留时间(MRT)和年生产力(A)表明,针叶树是氮的最高效的利用者,常绿阔叶树次之,落叶树在氮的利用上是最低效的。

Above-ground biomass,above-ground NPP(net primary production),nutrient accumulation and distribution,and nutrient use efficiency of different life forms in natural evergreen broad-leaved forest were measured in the Jiulianshan Natural Reserve,Jiangxi Province,the south of China.Above-ground biomass was measured in two plots using allometric regression with harvesting method.The values were about 340 t/hm2 and 270 t/hm2,respectively with about 9.6 t /hm2 of leaf biomass.Above-ground NPP was about 9.9 t/hm2·y...