干旱区研究

干旱区研究 >

2024 , Vol. 41 >Issue 5: 830 - 842

DOI: https://doi.org/10.13866/j.azr.2024.05.11

植物生态

典型固沙植物种子萌发和幼苗生长对土壤水分的响应

  • 杨竹青 ,
  • 王磊 ,
  • 张雪 ,
  • 申建香 ,
  • 张伊婧 ,
  • 李欣宇 ,
  • 张波 ,
  • 牛金帅
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  • 1.宁夏大学生态环境学院，宁夏 银川 750021
    2.西北土地退化与生态系统恢复国家重点实验室培育基地，宁夏 银川 750021
    3.西北退化生态系统恢复与重建教育部重点实验室，宁夏 银川 750021
    4.宁夏黄河湿地生态系统国家定位观测研究站，宁夏 银川 750021
    5.宁夏中卫沙坡头国家级自然保护区管理局，宁夏 中卫 755000
杨竹青（1998-），女，硕士研究生，主要从事可持续生态学研究. E-mail: yzq759521190@163.com
张雪. E-mail: zhxue323@163.com

收稿日期: 2023-11-04

  修回日期: 2024-01-02

  网络出版日期: 2024-05-29

基金资助

宁夏科技创新领军人才项目(2021GKLRLX13);宁夏重点研发计划项目(2022BEG02012);自治区重点研发项目(2021BEG030-08);宁夏自然科学基金项目(2020AAC03108)

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Seed germination and seedling growth of typical sand-fixing plants in response to soil moisture

  • YANG Zhuqing ,
  • WANG Lei ,
  • ZHANG Xue ,
  • SHEN Jianxiang ,
  • ZHANG Yijing ,
  • LI Xinyu ,
  • ZHANG Bo ,
  • NIU Jinshuai
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  • 1. School of Ecology and Environment, Ningxia University, Yinchuan 750021, Ningxia, China
    2. Breeding Base for Sate Key Lab oratory of Land Degradation and Ecological Restoration in Northwestern China, Yinchuan 750021, Ningxia, China
    3. Key La boratory for Restoration and Reconstruction of Degraded Ecosystems in Northwestern China of Ministry of Education, Yinchuan 750021, Ningxia, China
    4. The National Positioning Observation and Research Station for the Yellow River Wetland Ecosystem, Yinchuan 750021, Ningxia, China
    5. Ningxia Zhongwei Shapotou National Nature Reserve Administration, Zhongwei 755000, Ningxia, China

Received date: 2023-11-04

  Revised date: 2024-01-02

  Online published: 2024-05-29

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摘要

固沙植物种子萌发和幼苗生长是土地荒漠化治理的决定性环节，土壤水分是影响该环节的主要限制因子。本研究通过室内盆栽实验，以花棒（Hedysarum scoparium）、柠条锦鸡儿（Caragana korshinskii）和沙蒿（Artemisia desertorum）为研究对象，比较分析了不同水分梯度处理下（4%、6%、8%、10%、15%、20%和25%）3种固沙植物的种子萌发特性与幼苗生长过程中的表型特征差异，探讨固沙植物种子萌发和幼苗生长对土壤水分变化的响应。结果表明：（1） 随着土壤水分的增加，3种固沙植物的种子萌发特性均存在显著差异（P<0.05）。萌发率均随土壤水分的增加表现出先增加后降低的趋势。其中，花棒在土壤水分为15%、20%时萌发率最高，均为83%；柠条锦鸡儿在土壤水分为10%时萌发率最高，为73%；沙蒿种子萌发率在土壤水分为15%时达到最大值77.5%，随后慢慢降低，但变化不显著。（2） 3种植物的叶面积和根长均随土壤水分的增加呈现先增加后降低的趋势，比叶面积和根冠比呈现先降低后增加的趋势。（3） 花棒、柠条锦鸡儿、沙蒿幼苗分别在土壤水分为10%、8%、20%时生物量最高，分别为0.0733 g、0.1142 g和0.0363 g，且地上生物量显著高于地下生物量（P<0.05），但柠条锦鸡儿幼苗对地下生物量分配较花棒和沙蒿更高。（4） 3种固沙植物的SOD活性、POD活性、CAT活性、Pro含量、SS含量以及Chl含量均随土壤水分的增加呈先增高后降低的趋势，而MDA含量、膜透性以及相对含水量呈先降低后升高的趋势。基于以上结果，通过隶属函数法分析得出3种固沙植物分别在土壤水分为15%、8%和8%时幼苗长势最好。因此，后续采用这3种固沙植物进行植被恢复时，除考虑种子自身性状外，还应充分考虑由降雨条件引起的土壤水分的变化，以提高出苗率和幼苗生长的成功率。

关键词： 土壤水分胁迫; 盆栽试验; 种子萌发; 幼苗生长; 表型

本文引用格式

杨竹青 , 王磊 , 张雪 , 申建香 , 张伊婧 , 李欣宇 , 张波 , 牛金帅 . 典型固沙植物种子萌发和幼苗生长对土壤水分的响应[J]. 干旱区研究, 2024 , 41(5) : 830 -842 . DOI: 10.13866/j.azr.2024.05.11

Abstract

Seed germination and the seedling growth of sand-fixing plants are decisive aspects of land desertification management, and soil moisture is the main limiting factor affecting these aspects. In this study, we compared and analyzed the seed germination of three sand-fixing plants under different moisture gradients (4%, 6%, 8%, 10%, 15%, 20%, and 25%) in an indoor potting experiment using Hedysarum scoparium, Caragana korshinskii, and Artemisia desertorum to investigate the response of seed germination and seedling growth of sand-fixing plants to changes soil in moisture. The results showed that: (1) significant differences (P<0.05) were observed in the seed germination characteristics of the three sand-fixing plants as the soil moisture increased. The germination rates tended to increase and then decrease as the soil moisture increased. C. scoparium had the highest germination rate at 15% and 20% soil moisture (83.00% in both); C. korshinskii had the highest germination rate at 10% soil moisture (73.00%); and the seed germination rate of A. desertorum reached the maximum value of 77.50% at 15% soil moisture, and then slowly decreased, although the change was not significant. (2) The leaf area and root length of the three plants showed tended to first increase and then decrease as the soil moisture increased, and the specific leaf area and root:crown ratio tended to decrease and then increase. (3) The highest biomass of C. scoparium, C. korshinski, and A. desertorum seedlings was 0.0733 g, 0.1142 g, and 0.0363 g at 10%, 8%, and 20% soil moisture, respectively, and the aboveground biomass was significantly higher than the belowground biomass (P<0.05), although the allocation of belowground biomass by C. korshinski seedlings was higher than that of C. scoparium and A. desertorum. (4) The SOD activity, POD activity, CAT activity, Pro content, SS content, and Chl content of the three sand-fixing plants tended to increase and then decrease as the soil moisture increased, whereas the MDA content, membrane permeability, and relative water content tended to decrease and then increase. Based on the above results, it was concluded that the three sand-fixing plants of C. scoparium, C. korshinski, and A. desertorum had the best seedling growth at 15%, 8% and 8% soil moisture, respectively, through the analysis of the affiliation function method. Therefore, when these three sand-fixing plants are used for vegetation restoration, the changes in soil moisture caused by rainfall conditions should be fully considered in addition to the seeds’ own traits to improve the seedling emergence rate and the success of seedling growth.

Key words： soil moisture stress; pot experiment; seed germination; seedling growth; phenotype

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