摘要
植物功能性状组合的权衡是植物适应土壤环境的重要机制,它也通过对根际效应的调控进而影响着根际过程和生态系统功能。以位于宁夏盐池县的典型荒漠草原为研究区域,通过对灰钙土、黑垆土和风沙土中蒙古冰草功能性状和根际效应的对比分析,探究不同土壤对蒙古冰草功能性状和根际效应的影响以及它们之间的关系。结果表明:(1)不同土壤中蒙古冰草根际和非根际土壤理化性质存在显著差异,根际土壤理化性质的变化与非根际土壤性质有关。(2)不同土壤中的根际效应大小存在差异,不同因子的根际效应大小因土壤而异,总体表现为风沙土最大,灰钙土最小;土壤理化性质是影响蒙古冰草根际效应的主要因素,可解释根际效应变异的69.5%。(3)土壤理化性质与蒙古冰草功能性状密切相关,其对根长和根冠比的影响最大;蒙古冰草功能性状与根际效应大小密切相关,根长和根冠比是影响根际效应的主要因子。研究表明蒙古冰草通过根际效应改善了土壤性质,进而提高土壤质量,这种作用受土壤理化性质和植物功能性状等因子的共同影响。
The balancing of plant functional traits combination is an important mechanism for plants to adapt to the soil environment,and it also affects rhizosphere processes and ecosystem functions by regulating rhizosphere effects(RE).The typical desert steppe in Yanchi County of Ningxia was selected as the study area.The effects of different soils on the functional traits and RE of Agropyron mongolicum and their relationships were explored through comparing the functional traits and REs of A.mongolicum in sierozem soil,dark loessial soil and aeolian soil.Results highlighted that:(1)there were significant differences in the physicochemical properties of the rhizosphere and non-rhizosphere soils in different soil types,and the changes of physicochemical properties of rhizosphere soil were related to the properties of non-rhizosphere soil.(2)There were differences in the RE in different soils,and the RE size of different factors varied with soil.The overall performance of RE was the largest in aeolian soil and the smallest in sierozem soil.Soil physicochemical properties were the main factors affecting the RE of A.mongolicum,which could explain 69.5%of the variation of RE.(3)Soil physicochemical properties were closely related to the functional traits of A.mongolicum,which had the greatest impact on root length and root-shoot ratio.The functional traits of A.mongolicum were closely related to the RE size,and root length and root-shoot ratio were the main factors affecting RE.This study indicated that the A.mongolicum improved soil properties and soil quality through RE,which was regulated by soil physicochemical properties and plant functional traits together.
作者
李云飞
张雪
刘智贤
王培源
刘秉青
杨昊天
刘立超
吴旭东
LI Yunfei;ZHANG Xue;LIU Zhixian;WANG Peiyuan;LIU Bingqing;YANG Haotian;LIU Lichao;WU Xudong(Shapotou Desert Research and Experiment Station,Northwest Institute of Eco Encironment and Resoures,Chinese Academy of Sciences,Lanzhou 730000,China;Unitersity of Chinese Academy of Sciences,Beijing 101408,China;Ningxia Zhonguei Shapotou District Meteorological Bureau,Zhonguei 755000,China;College of Ecological Encironment,Ningxia Uninersity,Yinchuan 750002,China;Institute of Forestry and Grassland Ecology,NingXia Academy of Agricultural and Forestry Sciences,Yinchuan 750002,China)
出处
《生态学报》
CAS
CSCD
北大核心
2023年第21期8683-8691,共9页
Acta Ecologica Sinica
基金
宁夏回族自治区农业科技自主创新资金项目(NGSB-2021-14-04)
宁夏回族自治区重点研发计划项目(2022CMG03049)
宁夏回族自治区科技惠民专项(2022CMG03005)。
关键词
蒙古冰草
功能性状
根际效应
土壤理化性质
Agropyron mongolicum
functional trait
rhizosphere effect
soil physicochemical properties
