Straw interlayer improves sunflower root growth:Evidence from moisture and salt migration and the microbial community in saline-alkali soil  

作　　者：Mengmeng Chen Guoli Wang Yupeng Jing Jie Zhou Jiashen Song Fangdi Chang Ru Yu Jing Wang Weini Wang Xia Sun Hongyuan Zhang Yuyi Li 

机构地区：[1]State Key Laboratory of Efficient Utilization of Arid and Semi-arid Arable Land in Northern China,Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences,Beijing 100081,China [2]Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences,Hohhot 010031,China [3]College of Agriculture,Nanjing Agricultural University,Nanjing 210095,China [4]Ordos Agriculture and Animal Husbandry Ecology and Resource Protection Center,Ordos 017001,China

出　　处：《Journal of Integrative Agriculture》2024年第11期3870-3881,共12页农业科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(U23A2054);the Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Sciences(CAAS-ZDRW202201);the earmarked fund for China Agriculture Research System(CARS-02-24);the Inner Mongolia Autonomous Region Research Project of China(NMKJXM202303-03 and 2021EEDSCXSFQZD011-03);the National Key Scientific Research Project of China(2023YFD200140401);the Ordos Science and Technology Major Project,China(ZD20232320)。

摘　　要：A straw interlayer added to soil can effectively reduce soil salinity effects on plant growth,however,the effects of soil moisture,salt and microbial community composition on plant growth under a straw interlayer are unclear.A rhizobox study was conducted to investigate the role of straw interlayer thickness on soil moisture,salt migration,microbial community composition,as well as root growth in sunflower.The study included four treatments:Control(no straw interlayer);S3(straw interlayer of 3.0 cm);S5(straw interlayer of 5.0 cm);S7(straw interlayer of 7.0 cm).Straw interlayer treatments increased soil moisture by 8.2–11.0%after irrigation and decreased soil salt content after the bud stage in 0–40 cm soil.Total root length,total root surface area,average root diameter,total root volume and the number of root tips of sunflower plants were higher under straw interlayer treatments than in the control,and were the highest under the S5 treatment.This stimulated root growth was ascribed to the higher abundance of Chloroflexi and Verrucomicrobia bacteria in soil with a straw interlayer,which was increased by 55.7 and 54.7%,respectively,in the S5 treatment.Addition of a straw interlayer of 5 cm thickness is a practical and environmentally feasible approach for improving sunflower root growth in saline-alkali soil.

关 键 词：saline-alkali soil RHIZOBOX soil water soil salt content bacterial community 

分 类 号：S565.5[农业科学—作物学]