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首页> 外文期刊>New Forests >Soil fertility and fine root distribution after gypsum application in Eucalyptus plantations with different tolerance to water deficit
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Soil fertility and fine root distribution after gypsum application in Eucalyptus plantations with different tolerance to water deficit

机译：桉树种植园桉树种植型不同耐水性差异的土壤肥力和细根分布

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摘要

Most Eucalyptus plantations in Brazil are located in regions with low fertility soils and seasonal droughts. The main objectives of the present study were to evaluate the fine root distribution of Eucalyptus along the soil profile and the vertical distribution of Ca, Mg, S, and K in the soil in response to dolomitic limestone and gypsum application under severe water deficit conditions. The experiment was designed in randomized blocks. Two clones of the hybrid Eucalyptus urograndis (one clone was tolerant to water deficit and one clone was susceptible to water deficit) were used under two crop conditions (with and without gypsum application). Fine root density (FRD) and root length density (RLD) decreased gradually along the soil profile. Gypsum application increased RLD in some soil layers in the tolerant clone. The Ca, Mg, and S-SO42- content of the soil increased in both clones. Both clones showed an increase in wood volume in response to gypsum application. The Ca, Mg, and S-SO42- content of the soil increased in both clones. Both clones showed an increase in wood volume in response to gypsum application. At 46 months after planting, the wood volume increased by 17% in the susceptible clone and by 24% in the tolerant clone. The use of soil conditioners, such as gypsum and limestone, is important to improve soil fertility and root distribution for both clones, especially in a prolonged drought season.
机译：巴西的大多数桉树种植园位于具有低生育土壤和季节性干旱的地区。本研究的主要目的是评估桉树沿土壤曲线的细根分布和土壤中Ca，Mg，S和K的垂直分布，响应于严重水缺陷条件下的白云岩石灰石和石膏应用。实验是在随机块中设计的。在两种作物条件下使用两种杂交桉氟盐（一种克隆对水不足的克隆，一个克隆）（有没有石膏应用）。细根密度（FRD）和根长密度（RLD）沿土壤剖面逐渐降低。石膏应用在耐受克隆中的一些土层中增加了RLD。两种克隆都增加了土壤的Ca，Mg和S-SO42-含量。两种克隆响应于石膏应用而显示出木材体积增加。两种克隆都增加了土壤的Ca，Mg和S-SO42-含量。两种克隆响应于石膏应用而显示出木材体积增加。在种植后46个月，在易感克隆中，木材体积增加17％，耐受性克隆中的24％增加。使用石膏和石灰石等土壤调节剂的使用对于改善克隆的土壤肥力和根系分布，特别是在延长的干旱季节。

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