BIOMASS, ANNUAL NET PRIMARY PRODUCTION, AND DYNAMICS OF SIX MINERAL ELEMENTS IN A POST OAK-BLACKJACK OAK FOREST'
BIOMASS, ANNUAL NET PRIMARY PRODUCTION, AND DYNAMICS OF SIX MINERAL ELEMENTS IN A POST OAK-BLACKJACK OAK FOREST'
复制标题
后橡树-二十一点橡树林中的生物量、年净初级生产力和六种矿物元素的动态
作者：
F. L. Johnson;P. Risser
一个婴儿。采用量纲分析法对后栎-黑杰克栎（Quercus stellata-Q.位于俄克拉荷马州中部的一片森林。在各种植物组织中的6种矿物元素的浓度进行了测定，并与生物量和生产估计计算的N，P，K，Ca，Mg和Mn在森林中的年循环。林分有机质总量为24.5万kg/ha，其中叶占1.6%，活枝占26.4%，枯枝占5.9%，树干占44.8%，根占15.9%，林下植物占9.6%，凋落物占4.4%。年净初级生产量为14，900 kg/ha，分布如下：叶32.0%，枝和枝28.0%，干24.9%，根15.1%，和2.0%林下植物。最大叶面积指数为4.8。年平均凋落物量为5，400公斤/公顷，是明显的生物模式，高峰在11月和3月。生物量含有1，157 kg/ha N、101 kg/ha P、1，258 kg/ha K、4，549 kg/ha Ca、311 kg/ha Mg和124 kg/ha Mn。为这六种元素确定了年度矿物预算。不寻常的高值钙的生物量和矿物循环是由于高浓度的钙后橡树树皮（90,200 tg/g）。高的生物量和保留的矿物元素的增量的年度值表明，该立场还没有达到稳定状态，这一结论是证实了观察林分结构。
A bstract. Dimension analysis was used to estimate biomass and annual net primary production for a post oak-blackjack oak (Quercus stellata-Q. marilandica) forest in central Oklahoma. Concentrations of six mineral elements in various plant tissues were determined and used with biomass and production estimates to calculate the annual cycle of N, P, K, Ca, Mg, and Mn in the forest. Total organic material in the forest is 245,000 kg/ha, of which 1.6% is leaves, 26.4% live branches, 5.9% dead branches, 44.8% trunks, 15.9% roots, 9.6% understory, and 4.4% litter. Annual net primary production is 14,900 kg/ha, distributed as follows: 32.0% leaves, 28.0% twigs and branches, 24.9% trunks, 15.1% roots, and 2.0% understory. Maximum leaf area index was 4.8. Yearly mean litterfall is 5,400 kg/ha and is distinctly biomodal, with peaks in November and March. The biomass contains 1,157 kg/ha N, 101 kg/ha P, 1,258 kg/ha K, 4,549 kg/ha Ca, 311 kg/ha Mg, and 124 kg/ha Mn. Yearly mineral budgets were determined for the six elements. Unusually high values for Ca in the biomass and in the mineral cycle were due to high concentrations of Ca in post oak bark (90,200 tg/g). High annual values for increment of biomass and for retention of mineral elements indicate that the stand has not reached a steady state, a conclusion that is confirmed by observations of stand structure.