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• W2313432040 abstract "PDF HTML阅读 XML下载 导出引用 引用提醒 水肥耦合对欧美108杨幼林表土层细根形态及分布的影响 DOI: 10.5846/stxb201308032013 作者: 作者单位: 北京林业大学省部共建森林培育与保护教育部重点实验室,北京林业大学省部共建森林培育与保护教育部重点实验室,北京市共青林场,北京林业大学省部共建森林培育与保护教育部重点实验室,北京林业大学省部共建森林培育与保护教育部重点实验室 作者简介: 通讯作者: 中图分类号: 基金项目: 国家林业公益性行业科研专项经费重大项目(201004004) Coupling effect of water and nitrogen on the morphology and distribution of fine root in surface soil layer of young Populus×euramericana plantation Author: Affiliation: The Key Laboratory of Silviculture and Conservation of Ministry of Education,Beijing Forestry University,The Key Laboratory of Silviculture and Conservation of Ministry of Education,Beijing Forestry University,Gongqing Forest Farm of Beijing,The Key Laboratory of Silviculture and Conservation of Ministry of Education,Beijing Forestry University,The Key Laboratory of Silviculture and Conservation of Ministry of Education,Beijing Forestry University Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:采用根钻法对水肥耦合条件下(地表滴灌和随水施肥)欧美108杨幼林(Populus×euramericana cv.‘Guariento’)林地0-30 cm表土层细根形态及分布进行了系统研究。田间试验设计3个灌溉水平(灌溉土壤水势起始阈值为-75、-50、-25 kPa)和3个养分水平(施N150、300、450 g 株-1 a-1),组合成9个水肥耦合处理,另设1个对照处理(CK)。研究结果表明:(1)垂直方向上,10个处理下欧美108杨幼林细根生物量、表面积、体积和根长密度均随着土壤深度的增加而递减(且多数处理达到显著水平),而比根长则在低水和中水处理下表现出0-10 cm土层显著小于10-20 cm和20-30 cm土层,在高水和CK处理下各土层之间差异不显著(P < 0.05)。从表征细根分布特征的多数指标来看,水肥耦合没有改变欧美108杨幼林细根的垂直分布格局,其细根主要分布在0-10cm土层,该层生物量和根长密度分别是10-20 cm土层的1.25-5.05倍和1.05-2.05倍、分别是20-30 cm土层的2.8-13.06倍和1.99-4.99倍。(2)欧美108杨幼林细根生物量、根长密度、表面积和体积均表现出:低肥量下的3个滴灌水平处理均与CK无显著差异,中肥和高肥量下的6个处理均显著大于CK,尤其高水高肥处理促进细根生长的效果最显著,其3个土层细根生物量较CK分别显著提高了316%、 386%和442%,根长密度较CK分别显著提高了345%、176%、132%(P < 0.05);各处理比根长均随着滴灌和施肥量的增加而减小。(3)同一滴灌水平下各土层细根生物量随施肥量变化的回归方程拟合具有较高R2(0.702-0.891),P < 0.0001,而同一施肥水平下各土层细根生物量随滴灌量变化的回归方程拟合度较低,说明欧美108杨幼林细根的趋肥性强于向水性,故在对其水肥经营管理中应该将施肥措施放在首位。 Abstract:Root system plays an important role in uptake of water and nutrients by Poplar trees. Understanding the coupling effect of water and nitrogen on the morphology and distribution of fine roots will assist in making efficient water and nutrient management strategies for fast-growing and high-yield Populus×euramericana cv.‘Guariento’ plantations. In this study, drilling method is used to investigate the morphology and distribution of fine roots in 0-30 cm soil layers in a young poplar plantation under the surface drip irrigation and fertilization technology. The trial includes nine treatments, which were different combinations among three irrigation treatments (drip irrigation was initiated when soil water potential (ψsoil) reaches -75, -50,or -25 kPa) and three fertilization treatments (nitrogen application rates are respectively 150, 300, or 450 g tree-1 a-1). A control non-irrigation and non-fertilization treatment (CK) is also included. Results showed that, for the vertical direction, the biomass, surface area, the volume and length density of fine roots were significantly decreased with increased soil depth in all treatments. In -50 and -75 kPa treatments, specific root length in 0-10 cm soil layer is significantly lower than those in 0-10 and 20-30 cm soil layers. Whereas, in -25 kPa and CK treatments, no significant differences in root length density are detected among various soil layers. According to the distribution of most fine root parameters, the vertical distribution pattern of fines is not affected by the interaction between water and fertilizer. Fine roots were mainly distributed in 0-10cm, where the biomass and root length density was 1.25-5.05 and 1.05-2.05 times as high as that in 10-20 cm, and 2.80-13.06 and 1.99-4.99 times as high as that in 20-30 cm. The biomass, root length density, surface area and volume of fine roots in the three irrigation treatments were significantly larger than CK under middle and high fertilizer level, but this was not found under low fertilizer level. Especially, fine roots biomass under both high water and fertilizer level, which significantly promoted the growth of fine roots best. Compared with CK, the fine roots biomass of three soil layers were significantly improved 326%, 386% and 442%, respectively, and the root length density was significantly increased by 345%, 176% and 176%, respectively. Each water and fertilizer treatments showed that the amount of specific root length decreased as the amount of drip irrigation and fertilization increased. Fine root biomass changed with the fertilization varied by a regression equation which was fitted with high a value of R2(0.702-0.891), under the same fertilization level in each soil layer but was fitted with low relationship under the same drip irrigation in each soil layer. It illustrates that the response to the coupling effect of water and fertilizer of fine root growth and distribution has a stronger trend to fertiliertaxis than hydrotropism of poplar plantation. 参考文献 相似文献 引证文献" @default.
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• W2313432040 title "Coupling effect of water and nitrogen on the morphology and distribution of fine root in surface soil layer of youngPopulus×euramericanaplantation" @default.
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