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对巴西米纳斯吉拉斯州北部半干旱地区(15°09’S43°49’W)的赤桉(Eucalyptus camaldulensis)和大桉(Eucalyptus grandis)人工林的地上生物量、营养成分含量和菌根菌定植百分率进行了调查和分析。结果表明,赤按和大桉人工林的总地上生物量分别为33.6Mg·hm-2和153.1Mg·hm-2。赤桉树干、叶子、枝条和树皮的生物量分别占总生物量的64.4%,19.6%,15.4%,0.6%,大桉地上生物量的分配与赤按基本相同。赤桉叶子和枝条的干物质占其总生物量的35%,叶子和枝条中的N,P,K,Ca,Mg,and S的含量分别占总生物量这些营养元素的15.5%,0.7%,12.3%,22.6%,19%,1.4%。树干(包括树皮)中的营养成分累积相对比较低。与赤桉相比,大桉的营养含量变化较小。这2个树种的树干上部含有高浓度的磷,树皮也含有大量的营养物质,尤其是大桉;说明在半干旱地区,立地上脱落的植物性废物对降低树木生产力损失有重要意义。赤桉和大桉都有菌根营养。
Above-ground biomass, nutrient content and fungi of Eucalyptus camaldulensis and Eucalyptus grandis plantations in semi-arid areas of northern Minas Gerais (15 ° 09’S43 ° 49’W) Root colonization rate was investigated and analyzed. The results showed that the total aboveground biomass of A. xylostella and E. grandis plantation were 33.6Mg · hm-2 and 153.1Mg · hm-2, respectively. The biomass of red eucalyptus trunk, leaves, branches and barks accounted for 64.4%, 19.6%, 15.4% and 0.6% of the total biomass, respectively. The dry matter of leaves and shoots of Eucalyptus grandis accounted for 35% of the total biomass, and the contents of N, P, K, Ca, Mg and S in leaves and shoots accounted for 15.5%, 0.7% , 12.3%, 22.6%, 19%, 1.4%. The accumulation of nutrients in the trunk (including the bark) is relatively low. Eucalyptus compared with Eucalyptus small changes in the nutritional content. The two tree species had high concentrations of phosphorus in the upper part of the tree trunk and a large amount of nutrients in the bark, especially in Eucalyptus grandis. The results showed that the vegetation on the site in semi-arid area was of great importance to reduce the loss of tree productivity. Eucalyptus and eucalyptus have mycorrhizal nutrition.