荒漠草原自然和人工植被土壤养分及氮循环功能基因丰度特征研究  

Abundance characteristics of soil nutrients and nitrogen cycle functional genes in the natural and artificial vegetation of desert grasslands

作　　者：温淼 冒辛平 杨捷钧[1] 孙嘉忆 吴旭东 韩凤朋 WEN Miao;MAO Xinping;YANG Jiejun;SUN Jiayi;WU Xudong;HAN Fengpeng(College of Natural Resources and Environment,Northwest A&F University,Yangling 712100,Shaanxi,China;Institute of Agricultural Resources and Environment,Ningxia Academy of Agriculture and Forestry Sciences,Yinchuan 750002,Ningxia,China;National Observation and Experiment Station of Agricultural Environment,Yinchuan 750002,Ningxia,China;Institute of Forestry and Grassland Ecology,Ningxia Academy of Agricultural and Forestry Sciences,Yinchuan 750002,Ningxia,China;Research Center on Soil&Water Conservation,Institute of Soil and Water Conservation,Chinese Academy of Sciences Ministry of Water Resources,Yangling 712100,Shaanxi,China)

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]宁夏农林科学院农业资源与环境研究所,宁夏银川750002 [3]国家农业环境银川观测实验站,宁夏银川750002 [4]宁夏农林科学院林业与草地生态研究所,宁夏银川750002 [5]中国科学院水利部水土保持研究所,水利部水土保持生态工程技术研究中心,陕西杨凌712100

出　　处：《干旱区研究》2024年第12期2027-2034,共8页Arid Zone Research

基　　金：宁夏回族自治区重点研发计划项目(重点)课题(2022BBF02033);宁夏自然科学基金项目(2023AAC03436);第五批宁夏青年科技人才托举工程。

摘　　要：以7种荒漠草原适生物种为对象,通过野外采样和室内分析的方法,对荒漠草原区自然和人工植被土壤养分及其与氮循环之间的关系进行分析,结果表明:(1)猪毛菜和柠条养分含量较高,对养分具有固定作用,有利于研究区域养分含量恢复;同时显著提高根际土壤bac、AOA、AOB、nirS、nirk、nifH、nosZ基因丰度。(2)nifH基因丰度与土壤养分之间存在显著相关性。(3)研究区域土壤生态恢复受碳氮元素的共同作用,需调整施肥结构,改善土壤环境。自然植被猪毛菜和人工植被柠条在土壤养分固定和氮循环功能基因丰度上均优于其他植被,更适合在研究区域种植,这一结果也为压砂地生态修复植物的筛选具有参考意义。In this study,we examined seven species suited to desert grasslands and analyzed the relationship be-tween soil nutrients and nitrogen cycling in natural and artificial vegetation through field sampling and laboratory analysis.The results showed the following:(1)Salsola collina and Caragana korshinskii howed high nutrient content,which had a fixed effect on nutrients and was conducive to the restoration of nutrient content within the study area.Additionally,these species significantly increased the abundance of bac,AOA,AOB,nirS,nirK,nifH,and nosZ genes in the rhizosphere soil.(2)The abundance of the nifH gene was significantly correlated with soil nutrient levels.(3)The ecological restoration of soil in the study area is influenced by the combined effects of car-bon and nitrogen,necessitating adjustments to the fertilization structure and improvements to the soil environ-ment in the future.Overall,natural vegetation,such as Salsola collina,and artificial vegetation,such as Caraga-na korshinskii,outperformed other species in soil nutrient fixation and nitrogen cycling functional gene abun-dance,making them ideal for restoration in the study area.These findings provides valuable insights for selecting plant species in future ecological restoration of gravel-sand-mulched fields.

关 键 词：荒漠草原 植被恢复 土壤理化性质 氮循环 功能基因 

分 类 号：S812[农业科学—草业科学]