太行山地区荆条灌木"肥岛"对外源氮响应机制及保育作用研究

项目名称： 太行山地区荆条灌木"肥岛"对外源氮响应机制及保育作用研究

项目编号： No.31270750

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 农业科学

项目作者： 赵勇

作者单位： 河南农业大学

项目金额： 80万元

中文摘要： 【意义】干旱半干旱地区，合理利用灌木的保护效应能加快群落的演替速度，是困难条件下森林植被恢复的有效和便捷的途径之一。灌木"肥岛"效应是一种普遍现象，合理利用灌木"肥岛"的保育作用对干旱地区造林和植被恢复具有积极意义。【问题】但其空间分布格局不清；"肥岛"效应可以通过人工外加氮源得到提升和加强，但它对外源氮如何响应不明确。【研究内容】本项目以太行山地区主要灌木荆条为对象（1）从土壤理化性质和土壤微生物分析入手，分析灌木"肥岛"效应对外加氮源的响应及其空间变化特征；（2）根据地上的植物生长指标、小气候观测和地下土壤养分分析，探讨灌木的"肥岛"效应对林木幼苗保育效果。【预期结果】得到"肥岛"效应的空间格局和外加源氮下"肥岛"效应的变化特征；找出对施氮响应的敏感生态因子；最优化发挥灌木"肥岛"效应对林木幼苗保育作用的营养形成机制。

中文关键词： 肥岛；外源氮；土壤养分；微生物；保育作用

英文摘要： Creating forest surroundings is one of the the ultimate goals in Taihang Mountain.For efficient and convenient recovering forest cover in tough circumstances, making good use of protective effect of shrub could be applied to speed up the succession of community. Fertile island effect of shrub was a common phenomenon in arid and semi-arid region. This effect could be increased and enhanced by applying artificial nitrogen source. It was positive to reasonably use shrub fertile island for forestation and vegetation restoration in arid region. The research took shrubs communities of Vitex negundo var. heterophylla for example, studying the spatial framework of the fertile island effect, discussing the characteristic changes of this effect in condition of artificial nitrogen source, finding out sensitive ecological factors to applying artificial nitrogen source and learning the function of this effect to forest seedling conservation. The main contents were as follows: (1) From the analysis about soil physical and chemical properties and soil microorganism, this article analyzed the response of shrub fertile island under the conditions of artificial nitrogen source and the features of changes in space; (2) According to the growth indicators of aboveground vegetation、making microclimate observation and analysis of unde

英文关键词： fertile island；exogenous nitrogen；soil nutrient；microorganism；protective function