草地学报

草地学报 ›› 2026, Vol. 34 ›› Issue (6): 2161-2172.DOI: 10.11733/j.issn.1007-0435.2026.06.019

• 研究论文 • 上一篇    

宁夏罗山不同海拔高度山地草原优势植物水分利用来源研究

马海涛1,2,3, 马瑞5, 韩梦洁1,2,3, 田小龙1,2,3, 马海燕1,2,3, 马红彬1,2,3,4, 沈艳1,2,3,4, 王国会1,2,3,4   

  1. 1. 宁夏大学农业农村部饲草高效生产模式创新重点实验室, 宁夏 银川 750021;
    2. 宁夏大学宁夏草牧业工程技术研究中心, 宁夏 银川 750021;
    3. 宁夏大学林业与草业学院, 宁夏 银川 750021;
    4. 宁夏大学西北土地退化与生态恢复省部共建国家重点实验室培育基地, 宁夏 银川 750021;
    5. 宁夏罗山国家级自然保护区管理局, 宁夏 吴忠 751999
  • 收稿日期:2025-09-16 修回日期:2025-12-07 发布日期:2026-06-02
  • 通讯作者: 王国会,E-mail:wanggh2022@nxu.edu.cn
  • 作者简介:马海涛(1999-),男,回族,宁夏银川人,硕士生研究生,主要从事草地生态、资源与环境方向研究,E-mail:1608562770@qq.com
  • 基金资助:
    国家自然科学基金青年基金项目（32301504）；宁夏重点研发计划项目（2023BSB03072）；宁夏罗山自然保护区第三次综合科考项目；宁夏自然科学基金项目（2023AAC05020）和宁夏青年科技人才托举工程培养项目资助

Study on Water Use Strategies of Dominant Plants in Mountainous Grasslands at Different Altitudes in Luoshan， Ningxia

MA Hai-tao1,2,3, MA Rui5, HAN Meng-jie1,2,3, TIAN Xiao-long1,2,3, MA Hai-yan1,2,3, MA Hong-bin1,2,3,4, SHEN Yan1,2,3,4, WANG Guo-hui1,2,3,4   

  1. 1. Key Laboratory of Innovative High Efficiency Production Mode of Forage Grass, Ministry of Agriculture and Rural Affairs, Ningxia University, Yinchuan, Ningxia 750021, China;
    2. Ningxia Grassland and Animal Husbandry Engineering Technology Research Center, Ningxia University, Yinchuan, Ningxia 750021, China;
    3. School of Forestry and Prataculture, Ningxia University, Yinchuan, Ningxia 750021, China;
    4. Cultivation Base of State Key Laboratory for Land Degradation and Ecological Restoration in Northwest China, Ningxia University, Yinchuan, Ningxia 750021, China;
    5. Ningxia Luoshan National Nature Reserve Management Bureau, Wuzhong, Ningxia 751999, China
  • Received:2025-09-16 Revised:2025-12-07 Published:2026-06-02

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摘要： 本研究以宁夏罗山自然保护区温性草原不同海拔优势植物（海拔2374 m—薹草（Carex aridula）、海拔2132 m—大针茅（Stipa grandis）、海拔1823 m—大针茅、海拔1566 m—短花针茅（Stipa breviflora））为对象，采集优势植物的木质部水、降水、0~100 cm土层的土壤水进行稳定氢（氘—δD）氧（δ18O）同位素的测定，结合贝叶斯MixSIAR混合模型定量分析植物对潜在水源的利用率。结果表明：土壤水δ18O空间分异显著，随海拔升高总体减小，高海拔土壤水同位素值显著低于低海拔。不同海拔优势植物在生长季（6—7月）的水分利用模式呈现显著差异。高海拔薹草由6月主要吸收40~60 cm（23.8%）转向7月0~20 cm（26.9%）；中海拔大针茅从6月对0~100cm 土壤水分吸收比例范围为15.9%~22.3%，转为7月集中于0~40 cm；低海拔短花针茅稳定利用0~20 cm土层（27.8%~32.4%）。本研究为罗山温性草原优势物种水分利用与水分平衡提供了重要的科学依据。

关键词: 温性山地草原, 海拔高度, 优势植物, 氢氧同位素, 水分利用来源

Abstract: This study was conducted in the temperate steppe of Ningxia Luoshan Nature Reserve. The dominant plant species at different altitudes were selected as research objects： Carex aridula at 2374 m， Stipa grandis at 2132 m and 1823 m， and Stipa breviflora at 1566 m. Xylem water from the dominant plants， precipitation， and soil water from the 0-100 cm layer were collected. The stable hydrogen （δD） and oxygen （δ18O） isotopic compositions were determined. The MixSIAR mixing model was employed to quantitatively analyze the utilization ratios of plants to potential water sources. The results showed that： （1） Soil water δ18O exhibited significant spatial heterogeneity， generally decreasing with increasing altitude， with significantly lower isotopic values in soil water at high altitudes compared to low altitudes. （2） The water use patterns of dominant plants at different altitudes showed significant differences during the growing season （June-July）. Carex aridula at high altitude shifted its main water absorption source from the 40-60 cm soil layer （23.8%） in June to the 0–20 cm layer （26.9%） in July. Stipa grandis at mid-altitude changed from absorbing water from all soil layers （0-100 cm） with proportions ranging between 15.9% and 22.3% in June to concentrating water uptake in the 0-40 cm layer in July. Stipa breviflora at low altitude stably utilized water from the 0-20 cm shallow soil layer， with a utilization proportion between 27.8% and 32.4%. This study provides an important scientific basis for understanding the water use strategies of dominant species and the water balance in the Luoshan temperate steppe ecosystem.

Key words: Temperate mountainous grassland, Altitude, Dominant plant, Hydrogen isotope, Water sources

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