巨尾桉人工林无机养分及其平衡机制研究

Eucalyptus have a strong ability to adapt, and the rapid growth, high yield, short growth cycle, straight trunk, high economic efficiency are the main features by Eucalyptus. It has about 1.7 million hectares of planted eucalyptus, and the rapid development of an annual increase of over 10% of the rate in Guangxi now. Eucalyptus production has become a pillar industry in Guangxi current and future forestry production development. There are a lot of problems in fertilizer selection and uses by Eucalyptus, not based entirely on eucalyptus nutrient regulation mechanism of the preparation and application of fertilizer, resulting in lower fertilizer use efficiency; leaching loss of fertilizer susceptible to rain, and likely to cause environmental pollution; Mostly fertilizer are inorganic acidic physiological salt，they are not conducive to soil fertility maintenance. This project using a variety of nutritional diagnostics and comparative proteomics technology to study the Eucalyptus grandis×E.urophylla forest nutrient cycling characteristics and its variation, revealing Eucalyptus grandis×E.urophylla plantations inorganic nutrient balance and its regulation mechanism and the problems to be solved; the eucalypt new developed suitable for the popularization and application of slow release long-term efficacy of fertilizer to provide a theoretical basis in order to solve the single function of the eucalyptus forest application of fertilizers, low fertilizer, low nutrient use efficiency, in order to improve the productivity of eucalyptus plantations and the economic, social and ecological benefits, should be made to promote the sustainable development of eucalyptus some contribution.

桉树，具有适应能力强，生长迅速，单产高、生长周期短、树干通直、用途广泛和经济效益高等特点，广西已种植桉树约170万公顷，且以每年递增超过10％的速度迅猛发展。桉树生产已成为当前和今后广西林业生产发展的重要支柱产业之一。 目前在桉树的肥料选择和使用中存在问题较多，没有完全根据桉树养分调控机理进行肥料的配制和施用，造成肥料利用率较低；肥料易被雨水淋溶流失，并容易造成环境污染；多为无机生理酸性盐肥料，不利于地力的维护。本项目运用各种营养诊断法和比较蛋白质组学技术，旨在研究巨尾桉人工林养分循环特征及其变化规律，揭示广西巨尾桉人工林无机养分平衡及其调控机理和亟待解决的问题；为研制出适宜于推广应用的缓释长效等功效的桉树新型肥料提供理论依据，以解决广西桉树林施用肥料功能单一，肥效低，养分利用率低等问题，以期提高桉树人工林的生产力及经济、社会和生态效益，为促进广西桉树的可持续发展作出贡献。

桉树，具有适应能力强，生长迅速，单产高、生长周期短、树干通直、用途广泛和经济效益高等特点，广西已种植桉树约170万公顷，且以每年递增超过10％的速度迅猛发展。桉树生产已成为当前和今后广西林业生产发展的重要支柱产业之一。 目前在桉树的肥料选择和使用中存在问题较多，没有完全根据桉树养分调控机理进行肥料的配制和施用，造成肥料利用率较低；肥料易被雨水淋溶流失，并容易造成环境污染；多为无机生理酸性盐肥料，不利于地力的维护。本项目运用各种营养诊断法，旨在研究巨尾桉人工林养分循环特征及其变化规律。分析不同施肥处理下巨尾桉的生长、生理、营养及土壤养分、土壤微生物、土壤酶活性等指标的差异，揭示不同氮磷钾配比施肥下巨尾桉生长生理的特性，不同氮磷钾配比施肥下巨尾桉养分积累及需求规律，不同配方施肥下土壤养分与土壤微生物数量及酶活性的关联性等。分析巨尾桉无机养分平衡及其调控机理，探讨不同配方施肥下，巨尾桉叶片及根系与植株生长、有机酸代谢酶活性等抗性生理指标之间的关联性，为今后大力桉树精准施肥，改善土壤结构、维护地力等功效的多功能肥料提供科学依据。