Acta Agrestia Sinica ›› 2021, Vol. 29 ›› Issue (9): 2067-2073.DOI: 10.11733/j.issn.1007-0435.2021.09.025

Previous Articles     Next Articles

Spatial Heterogeneity of Gymnocarpos przewalskii Population in the Gobi Desert in the Middle Part of the South Foot of the Tianshan Mountains

DING Jie, ZHANG He-yu, LI Zhi-peng, ZHANG Pu, FENG Yi-ming   

  1. Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China
  • Received:2021-03-30 Revised:2021-05-26 Online:2021-09-15 Published:2021-10-14

天山南麓中段戈壁区裸果木种群空间异质性特征

丁杰, 张和钰, 李志鹏, 张谱, 冯益明   

  1. 中国林业科学研究院荒漠化研究所, 北京 100091
  • 通讯作者: 冯益明,E-mail:fengym@caf.ac.cn
  • 作者简介:丁杰(1992-),女,汉族,河北固安人,博士研究生,主要从事荒漠生态方面研究,E-mail:yixuandj@163.com
  • 基金资助:
    国家自然科学基金项目(31770764)资助

Abstract: Gymnocarpos przewalskii is one of the important constructive species of the Gobi desert. Studying spatial heterogeneity characteristics of G. przewalskii population has positive significance for the ecological restoration and sustainable development of Gobi desert. Through field experiments, geostatistical methods were used to analyze spatial heterogeneity characteristics of G. przewalskii population. The results showed that:Spatial distribution of G. przewalskii population showed a patchy distribution at the alluvial fan top and a stripe distribution at the alluvial fan middle and bottom. From the alluvial fan top to the alluvial fan bottom, the plant height and crown of G. przewalskii dencreased firstly and then increased. The average plant heights of G. przewalskii population at the alluvial fan top, middle and bottom were 33.13 cm, 21.71 cm, and 31.25 cm, respectively, and the average plant crown were 0.38 m2, 0.23 m2, 0.37 m2, respectively. The optimal fitting models for the semi-variograms of the plant height and crown of G. przewalskii population at the alluvial fan top and middle were both exponential models, but was linear model at the alluvial fan bottom. The spatial heterogeneity caused by the spatial autocorrelation was higher at the alluvial fan top and middle than at the alluvial fan bottom. The spatial distribution pattern at the alluvial fan top and middle was simpler than at the alluvial fan bottom. From the alluvial fan top to the alluvial fan bottom, the anisotropy of G. przewalskii population was gradually significant in a small spatial scale. The plant height of G. przewalskii population was significantly positive correlation with SWC (P<0.05). Soil moisture was critical to the spatial heterogeneity for G. przewalskii population.

Key words: South foot of Tianshan mountains, Gobi desert, Gymnocarpos przewalskii, Population pattern, Spatial heterogeneity

摘要: 裸果木(Gymnocarpos przewalskii)是戈壁区植被的重要建群种之一,研究其种群空间异质性特征对戈壁区生态恢复及其可持续发展具有积极意义。本研究通过野外试验调查,并采用地统计学方法分析了裸果木种群空间异质性特征。结果表明:扇顶裸果木种群空间分布表现为斑块状分布,扇中、扇底均表现为带状分布;从扇顶到扇底,裸果木种群植株高度和冠幅均表现为先减小后增大的变化趋势;扇顶、扇中和扇底植株高度均值依次为33.13 cm,21.71 cm,31.25 cm,植株冠幅均值依次为0.38 m2,0.23 m2,0.37 m2;裸果木种群植株高度和冠幅在扇顶、扇中半变异函数最优拟合模型均为指数模型,在扇底均为线性模型;扇顶、扇中由空间自相关导致的空间异质性高于扇底,空间分布格局比扇底简单;从扇顶到扇底,较小空间尺度内各向异性逐渐显著;裸果木种群植株高度与土壤含水量呈显著正相关关系(P<0.05)。土壤水分对裸果木种群空间异质性分布至关重要。

关键词: 天山南麓, 戈壁区, 裸果木, 种群格局, 空间异质性

CLC Number: