Journal of Integrative Agriculture ›› 2024, Vol. 23 ›› Issue (11): 3870-3881.DOI: 10.1016/j.jia.2024.03.048

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秸秆隔层促进向日葵根系生长:来自盐碱地水分、盐分迁移和微生物群落的证据

  

  • 收稿日期:2023-09-28 接受日期:2024-01-29 出版日期:2024-11-20 发布日期:2024-10-10

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

Mengmeng Chen1, Guoli Wang1, Yupeng Jing2, Jie Zhou3, Jiashen Song1, Fangdi Chang1, Ru Yu1, Jing Wang1, Weini Wang4, Xia Sun4, Hongyuan Zhang1#, Yuyi Li1#   

  1. 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

  • Received:2023-09-28 Accepted:2024-01-29 Online:2024-11-20 Published:2024-10-10
  • About author:Mengmeng Chen, E-mail: mengmengchen2018@163.com; #Correspondence Yuyi Li, Tel: +86-10-82105057, Fax: +86-10-82106225, E-mail: liyuyi@caas.cn; Hongyuan Zhang, E-mail: zhanghongyuan@caas.cn
  • Supported by:
    This work was 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), and 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:

在土壤中添加秸秆隔层可以有效降低土壤盐分对植物生长的影响,但秸秆隔层下土壤水分、盐分和微生物群落组成对植物生长的影响尚不清楚。通过根箱试验,研究了秸秆隔层厚度对向日葵土壤水分、盐分迁移、微生物群落组成及根系生长的影响。试验分为4个处理:对照(无秸秆夹层);S3(秸秆间层3.0 cm);S5(秸秆间层5.0 cm);S7(秸秆中间层7.0 cm)。在0 - 40 cm土壤中,秸秆隔层处理可使灌水后土壤水分提高8.2% - 11.0%,降低含盐量。秸秆隔层处理的向日葵植株总根长、总根表面积、平均根径、总根体积和根尖数均高于对照,其中以S5处理最高。这种刺激根系生长的原因是秸秆隔层土壤中绿弯菌门和疣微菌门细菌的丰度较高,在S5处理下分别增加了55.7%和54.7%。在盐碱地中添加5 cm厚的秸秆隔层是改善向日葵根系生长的一种实用且环保可行的方法。

Abstract:

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.


Key words: saline-alkali soil , rhizobox ,  soil water ,  soil salt content ,  bacterial community