Water Use Strategy of Reaumuria Songarica Population in Steppe Desert Region Based on Spatial Distribution

Wang Ru; Li Jinrong; Dong Lei; Zhang Zhijie; Luo Xiangying; Li Yingkun; Han Zhaoen

doi:10.13961/j.cnki.stbctb.2023.05.032

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Water Use Strategy of Reaumuria Songarica Population in Steppe Desert Region Based on Spatial Distribution

- Water Use Strategy of Reaumuria Songarica Population in Steppe Desert Region Based on Spatial Distribution
- Bulletin of Soiland Water Conservation Vol. 43, Issue 5, Pages: 270-278(2023)
- 作者机构：
  
  1. 内蒙古农业大学沙漠治理学院,内蒙古,呼和浩特,010018
  2. 中国水利水电科学研究院内蒙古阴山北麓草原生态水文国家野外科学观测研究站,北京,100038
  3. 呼和浩特市气象局,内蒙古,呼和浩特,010018
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2023.05.032
  CLC： Q948.1
- Published：2023
- 稿件说明：
移动端阅览
Wang Ru, Li Jinrong, Dong Lei, et al. Water Use Strategy of Reaumuria Songarica Population in Steppe Desert Region Based on Spatial Distribution[J]. Bulletin of Soiland Water Conservation, 2023, 43(5): 270-278.
DOI：

Wang Ru, Li Jinrong, Dong Lei, et al. Water Use Strategy of Reaumuria Songarica Population in Steppe Desert Region Based on Spatial Distribution[J]. Bulletin of Soiland Water Conservation, 2023, 43(5): 270-278. DOI： 10.13961/j.cnki.stbctb.2023.05.032.

摘要

[目的] 研究区域尺度上荒漠灌木水分适应与分布格局相呼应关系，揭示干旱半干旱地区植物种群对环境响应的过程与机理，为深入理解植物与环境协同进化规律提供依据。[方法] 采用点格局分析方法和氢氧稳定同位素示踪技术，分析了红砂(Reaumuria songarica)种群的空间分布格局、水分利用策略。[结果] ①在完全空间随机零模型下，红砂种群在＜3 m尺度内均匀分布，在＞32 m尺度内聚集分布，种群内部生态关系由竞争向促进转变；消除生境异质性后，种群在＞30 m尺度下呈现随机分布，种内生态关系呈现减弱的趋势。红砂种群空间分布格局的形成过程中生境异质性在大尺度上起到了重要作用。②随着多年平均降水量的减少，红砂种群的水分利用深度由0—20 cm加深到60—100 cm；红砂种群的密度与多年降水呈现极显著负相关(p＜0.01)，样地的植被盖度变化主要受草本盖度影响，红砂植被盖度变化不显著。[结论] 随着多年平均降水量的减少，红砂种群的分布格局受环境异质性影响。通过增加植株密度，红砂可以利用更深层的土壤水分适应环境胁迫。

Abstract

[Objective] The relationship between water adaptation and the distribution pattern of desert shrubs at the regional scale was studied and the process and mechanism of plant population response to environment in arid and semi-arid areas was analyzed in order to provide a basis for further understanding the co-evolution relationship between plants and environments. [Methods] The spatial distribution pattern and water use strategy of Reaumuria songarica populations were analyzed by using point pattern analysis and hydrogen and oxygen stable isotope tracing techniques. [Results] ① Under the complete spatial randomness model

the R. songarica population was uniformly distributed at ＜3 m scale

and aggregated at ＞32 m scale. The intra-population ecological relationship changed from competition to promotion. After habitat heterogeneity was eliminated

the population showed random distribution at ＞ 30 m scale

and the intra-population ecological relationship showed a weakening trend

indicating that habitat heterogeneity played an important role in the formation of the spatial distribution pattern of the R. songarica population. This result indicated that habitat heterogeneity played an important role in the formation of the spatial distribution pattern of R. songarica populations at large scales. ② As the multi-year average precipitation decreased

the water use depth of the R. songarica population deepened from 0—20 cm to 60—100 cm. The density of the R. songarica population showed a highly significant negative correlation with multi-year precipitation (p＜0.01). The change in vegetation cover at the sample site was mainly influenced by the herbaceous cover

and the change in R. songarica vegetation cover was not significant. [Conclusion] As multi-year average precipitation decreased

the distribution pattern of R. songarica populations was affected by environmental heterogeneity

and R. songarica adapted to environmental stress by increasing plant density and using deeper soil moisture.

关键词

Keywords

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