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Evaluation of the nutrient content in biomass of Eucalyptus species from short rotation plantations in Uruguay
Biomass & Bioenergy ( IF 6 ) Pub Date : 2020-02-10 , DOI: 10.1016/j.biombioe.2020.105502
Fernando Resquin , Rafael M. Navarro-Cerrillo , Leonidas Carrasco-Letelier , Cecilia Rachid Casnati , Luis Bentancor

Forest biomass is an interesting option for bioenergy generation, however sustainability aspects should be carefully considered. In this context, the nutrient exportation is a key factor for reach a sustainable biomass production by an adequate harvest decision about what tree's fractions will export less nutrients of farms. In this work biomass production per fraction and nutrient export for three eucalypt species (Eucalyptus benthamii, E.dunnii and E.grandis) planted at four planting densities: 2220, 3330, 4440 and 6660 trees per hectare, in two different sites, were evaluated at the age of 76 months. The assessed nutrients were: P, Ca, Mg, K and N in bark, branches, leaves, and stemwood fractions. Nutrients use efficiency and the balance between available cations in the soil (Ca, Mg and K) vs their export in the different tree components were assessed. The effect of the interaction (species x planting density) for almost all the variables evaluated was not significant in both sites. The nutrients concentration is slightly affected by the planting density while the nutrient export is significantly related to this parameter in both sites. Bark is the fraction with the higher Ca and Mg concentration values, whereas the higher concentrations of N and K were found on the leaves, meanwhile debarked stemwood is the fraction with the lower nutrient concentration. In the short term, K would be the nutrient that will exhaust first, although the use of stemwood allows an important reduction in the use of cations. Even with low planting densities it is possible to obtain high biomass yields and similar to those achieved with the lowest spacing in particular at the Paysandú site.



中文翻译:

乌拉圭短时人工林桉树生物量养分含量的评估

森林生物质是产生生物能源的一种有趣的选择,但是应仔细考虑可持续性方面。在这种情况下,养分输出是通过适当的采伐决策来决定哪种树的部分将输出更少的农场养分,从而实现可持续的生物量生产的关键因素。在这项工作中,三种桉树物种(桉木,本氏和大木)的每部分生物量生产和养分出口)在76个月龄时评估了在两个不同地点种植的四种种植密度:每公顷2220、3330、4440和6660棵树。评估的养分为:树皮,树枝,叶子和茎木部分中的P,Ca,Mg,K和N。评估了养分的利用效率,并评估了土壤中可用阳离子(钙,镁和钾)与不同树种中的出口之间的平衡。几乎所有评估变量的相互作用(物种x种植密度)的影响在两个地点均不显着。养分浓度对养分浓度的影响很小,而两个地方的养分输出均与此参数显着相关。树皮是具有较高Ca和Mg浓度值的部分,而在叶片上发现了较高N和K浓度,同时,去皮茎木是营养成分含量较低的部分。在短期内,钾是最先排出的养分,尽管使用阔叶材可以大大减少阳离子的使用。即使种植密度低,也有可能获得较高的生物量产量,并且与以最小间距实现的产量相似,尤其是在Paysandú厂。

更新日期:2020-02-20
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