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植物生态学报 >

2024 , Vol. 48 >Issue 9: 1202 - 1212

DOI: https://doi.org/10.17521/cjpe.2023.0295

研究论文

基于稳定同位素示踪的不同覆砂厚度下枣树水分利用策略

  • 李蓓蓓 ,
  • 张明军 ,
  • 车存伟 ,
  • 刘泽琛 ,
  • 钟晓菲 ,
  • 张园园 ,
  • 张宇
展开
  • 西北师范大学地理与环境科学学院, 甘肃省绿洲资源环境与可持续发展重点实验室, 兰州 730070
*张明军(mjzhang2004@163.com)

收稿日期: 2023-10-19

  录用日期: 2024-04-08

  网络出版日期: 2024-04-12

基金资助

国家自然科学基金(41771035);甘肃省基础研究创新群体项目(22JR5RA129)

收起

Water utilization strategy of Ziziphus jujuba under different sand cover thicknesses based on stable isotope tracing

  • LI Bei-Bei ,
  • ZHANG Ming-Jun ,
  • CHE Cun-Wei ,
  • LIU Ze-Chen ,
  • ZHONG Xiao-Fei ,
  • ZHANG Yuan-Yuan ,
  • ZHANG Yu
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  • College of Geography and Environmental Sciences, Northwest Normal University, Key Laboratory of Resource Environment and Sustainable Development of Oasis in Gansu Province, Lanzhou 730070, China

Received date: 2023-10-19

  Accepted date: 2024-04-08

  Online published: 2024-04-12

Supported by

National Natural Science Foundation of China(41771035);Gansu Province Basic Research Innovation Group Program(22JR5RA129)

Fold

摘要

干旱区覆砂条件显著影响土壤水分状况, 进而影响植被对土壤水分的吸收和利用。然而, 对于枣树(Ziziphus jujuba)在不同覆砂条件下的吸水策略及其对输入水的动态响应仍知之甚少。该研究于2023年5月利用氢氧稳定同位素方法结合贝叶斯混合模型(MixSIAR)研究了枣树在不同覆砂厚度下的水分利用策略及其对输入水的响应。结果表明: 不覆砂样地在灌溉后第2天出现土壤含水量(SWC)峰值, 覆砂5 cm的样地在灌溉后第4天出现峰值, 覆砂10和15 cm的样地在灌溉后第6天出现峰值, 覆砂显著提高了SWC, 增强了土壤的保水性。不覆砂样地的氧稳定同位素比值(δ18O)和氢稳定同位素比值(δ2H)分别为-5.4‰- -2.2‰和-76.1‰- -61.0‰, 覆砂样地的δ18O和δ2H分别为-5.6‰- -3.0‰和-61.0‰- -75.7‰。灌溉后第2、4、6天, 0-10 cm土层不覆砂样地枣树水分利用比例(16.2%、9.1%、10.0%)相较覆砂5、10、15 cm样地(73.0%、54.5%、37.0%; 49.0%、46.2%、22.8%; 27.1%、36.1%、21.4%)稳定且覆砂措施增加了枣树对0-10 cm土壤水的利用, 即枣树对深层土壤水的利用存在滞后效应。以上结果说明了覆砂措施能够有效提高土壤的保水性, 影响植物水分利用策略, 有利于植物适应当地的干旱条件以及应对其他的环境变化。

关键词： 同位素; 覆砂厚度; 贝叶斯模型; 土壤水分; 枣树; 水分利用

本文引用格式

李蓓蓓 , 张明军 , 车存伟 , 刘泽琛 , 钟晓菲 , 张园园 , 张宇 . 基于稳定同位素示踪的不同覆砂厚度下枣树水分利用策略[J]. 植物生态学报, 2024 , 48(9) : 1202 -1212 . DOI: 10.17521/cjpe.2023.0295

Abstract

Aims Sand cover conditions in arid zones significantly affect soil water status, which in turn affects the utilization of soil water by vegetation. However, little is known about the water uptake strategies of Ziziphus jujuba under different sand cover conditions and its dynamic response to input water.

Methods In this study, the water utilization strategies of Z. jujuba under different sand cover thicknesses and their responses to input water were investigated using the hydroxide stable isotope method combined with a Bayesian mixed model (MixSIAR).

Important findings We found that the peak of soil water content (SWC) appeared on the 2nd day after irrigation in the non-sand-covered sample plots, on the 4th day after irrigation in the 5 cm sand-covered sample plots, and on the 6th day after irrigation in the 10 and 15 cm sand-covered sample plots. Sand cover significantly increased the SWC, and enhanced the water retention of the soil. The oxygen stable isotope composition (δ18O) and hydrogen stable isotope composition (δ2H) were -5.4‰- -2.2‰ and -76.1‰- -61.0‰ in the non-sand-covered sample plots, and -5.6‰- -3.0‰ and -61.0‰- -75.7‰ in the sand-covered sample plots, respectively. The 2nd, 4th, and 6th day after irrigation, the percentage of water utilization by Z. jujuba in the 0-10 cm soil layer without sand cover (16.2%, 9.1%, 10.0%) was stable compared with that in the 5, 10, 15 cm sand-covered sample plots (73.0%, 54.5%, 37.0%; 49.0%, 46.2%, 22.8%; 27.1%, 36.1%, 21.4%) and sand-covering measures increased the date palm’s water utilization of the 0-10 cm soil water. The sand mulching measures increased the utilization of 0-10 cm soil water by Z. jujuba, i.e. there was a lag in the utilization of deep soil water by Z. jujuba. The above results show that sand mulching can effectively improve the water retention of soil and influence the water utilization strategy of plants, which has implications for the adaptation of plants to local drought conditions and other environmental changes.

Key words： isotopes; sand cover thickness; Bayesian modeling; soil water; Ziziphus jujuba; water utilization

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