黄鹏,周爱国,马传明,刘左,张泽琛,白耀楠

• 1:中国地质大学(武汉)环境学院
• 2:中国地质大学(武汉)地质调查研究院
• 3:中国地质调查局天津地质调查中心
• 4:中国地质调查局华北地质科技创新中心

摘要(Abstract)：

中国北方农牧交错带是中东部地区重要的生态安全屏障，由于其系统结构脆弱、生态环境问题多发、土地沙化严重，开展生态修复工作显得十分重要。植物-土壤水分关系作为土地沙化区生态水文过程的重要组成部分，研究二者的转化过程对于了解植物吸水模式、确定生态修复的首选植物种非常关键。以河北省张家口市康保县北部为例，基于雨季的大气降水、地下水、土壤水和植物水的氢氧同位素特征，分析了主要植物的吸水层位、生态位宽度和水分竞争关系。结果表明，柠条以吸收80～100 cm深度土壤水为主，吸水比例最大可达87.7%,油菜花以吸收0～20 cm深度土壤水为主，吸水比例最大可达82.3%,狼针的吸水层位与土壤含水率有关，在含水率较高的深度吸水比例更大，栉叶蒿的吸水深度较为均衡，各植物种的生态位宽度均较大，但部分植物间存在较强的水分竞争关系。本研究为中国北方农牧交错带土地沙化区的植物水源来源识别和生态修复提供了科学依据。

关键词(KeyWords)： 农牧交错带;土地沙化区;典型植物;稳定氢氧同位素;水分来源;生态位宽度;相似性比例

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局地质调查项目(DD20190820-W03);; 中央高校基本科研业务费(CUGCJ1822)

作者(Author): 黄鹏,周爱国,马传明,刘左,张泽琛,白耀楠

DOI: 10.19509/j.cnki.dzkq.tb20210474

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