文献类型：期刊文献

中文题名：干旱对暖温带锐齿槲栎林根系分泌物代谢特征的影响

英文题名：Drought Effects on the Metabolic Characteristics of Root Exudates in A Warm-temperate Oak Forest

作者：高小敏[1,2] 聂秀青[1,2] 王一[3] 邸雅平[3] 陈志成[1,2] 牛保亮[1,2] 刘晓静[4] 刘世荣[1,2]

第一作者：高小敏

机构：[1]中国林业科学研究院森林生态环境与自然保护研究所,国家林业和草原局森林生态环境重点实验室,北京100091;[2]河南宝天曼森林生态系统研究站,南阳474350;[3]国际竹藤中心竹藤资源与环境研究所,国家林业和草原局竹藤科学与技术重点实验室,北京100102;[4]河南宝天曼国家级自然保护区管理局,南阳474350

年份：2025

卷号：5

期号：3

起止页码：1-14

中文期刊名：陆地生态系统与保护学报

外文期刊名：Terrestrial Ecosystem and Conservation

基金：“十四五”国家重点研发计划项目(2021TFD220405);国家自然科学基金重点项目(31930078)。

语种：中文

中文关键词：干旱;锐齿槲栎林;根系分泌物;土壤理化性质;根系性状

外文关键词：drought;oak forest;root exudates;soil physicochemical properties;root traits

分类号：S714.3

摘要：【目的】了解和系统研究根系分泌物分泌速率和化学组分对长期干旱的响应机制。【方法】基于暖温带锐齿槲栎天然林长期穿透雨减雨控制试验,探究干旱对根系分泌物分泌速率和组分的影响及主要驱动因子。【结果】干旱显著影响暖温带锐齿槲栎根系分泌物的分泌代谢特征,其中根系分泌物碳(C)和总糖的分泌速率增加,总氨基酸的分泌速率降低,而对总有机酸的分泌速率无显著影响。根系性状对根系分泌物C及其主要组分(糖类、氨基酸和有机酸)变异的解释度达49.78%,其中细根生产力和细根平均直径是关键驱动因子。根系分泌物C分泌率与细根生产力显著正相关,与细根平均直径显著负相关。除此之外,土壤氮酶活性与根系分泌物C分泌速率显著正相关。【结论】研究表明,锐齿槲栎在干旱胁迫下通过调节根系性状改变根系分泌物分泌特征,进而增强与氮循环相关酶活性的协同作用,以提升其水分和养分利用效率,从而增强抗旱适应性。揭示了干旱调控下根系分泌物与根-土壤互作机制,为理解森林碳循环对全球变化的响应提供了新视角。
【Objective】Our purpose is to understand and systematically study the response mechanism of root exudates secretion rates and chemical components to long-term drought.【Method】Based on a throughfall reduction experiment in a warm-temperate Quercus aliena var.acuteserrata forest,we investigated the effects of drought on the quantity and composition of root exudates and explored their driving mechanisms.【Result】Drought significantly altered the metabolic characteristics of root exudates,increasing root exudate carbon(C)and total sugar exudation rates while decreasing total amino acid exudation,with no significant effect on total organic acid exudation.Root traits explained 49.78%of the variation in root exudate C and its main components(sugars,amino acids,and organic acids),with fine root production and mean root diameter being key drivers.Root exudate C exudation was positively correlated with fine root production and negatively correlated with mean root diameter.In addition,soil nitrogen-related enzyme activity was positively correlated with root exudate C exudation rate.【Conclusion】Under drought stress,oak forest adjusts root traits to modify root exudate exudation,which synergistically enhances nitrogen-related enzyme activity,thereby improving water and nutrient use efficiency and enhancing drought adaptation.This study highlights the mechanisms by which drought regulates root exudates and root-soil interactions,providing new insights into forest carbon cycling responses to global change.