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干旱区地理 ›› 2026, Vol. 49 ›› Issue (2): 301-315.doi: 10.12118/j.issn.1000-6060.2025.204 cstr: 32274.14.ALG2025204

• 生态与环境 • 上一篇    下一篇

青海湖流域草地植被生物量空间分布格局研究

裴若颖1,2(), 曹生奎1,2,3(), 侯瑶芳1,2, 雷义珍1,2, 王江1,2, 刘振梅1,2, 丁辰深1,2   

  1. 1.青海师范大学地理科学学院,青海省自然地理与环境过程重点实验室,青海 西宁 810008
    2.青海师范大学青藏高原地表过程与生态保育教育部重点实验室,青海 西宁 810008
    3.青海省人民政府-北京师范大学高原科学与可持续发展研究院,青海 西宁 810008
  • 收稿日期:2025-04-14 修回日期:2025-06-16 出版日期:2026-02-25 发布日期:2026-02-27
  • 通讯作者: 曹生奎(1979-),男,教授,主要从事生态水文与水资源学等方面的研究. E-mail: caoshengkui@163.com
  • 作者简介:裴若颖(2001-),女,硕士研究生,主要从事生态水文与水资源学等方面的研究. E-mail: peiruoying2001@163.com
  • 基金资助:
    青海省自然科学基金项目(2023-ZJ-924M)

Spatial distribution pattern of grassland vegetation biomass in the Qinghai Lake Basin

PEI Ruoying1,2(), CAO Shengkui1,2,3(), HOU Yaofang1,2, LEI Yizhen1,2, WANG Jiang1,2, LIU Zhenmei1,2, DING Chenshen1,2   

  1. 1. Qinghai Key Laboratory of Physical Geography and Environmental Process, College of Geographic Sciences, Qinghai Normal University, Xining 810008, Qinghai, China
    2. Key Laboratory of Tibetan Plateau Surface Processes and Ecological Conservation, Ministry of Education, Qinghai Normal University, Xining 810008, Qinghai, China
    3. Plateau Science and Sustainable Development Institute, Beijing Normal University, Qinghai Provincial Government, Xining 810008, Qinghai, China
  • Received:2025-04-14 Revised:2025-06-16 Published:2026-02-25 Online:2026-02-27

摘要:

草地植被生物量是衡量草地生态系统生产力和碳储量的重要指标,其空间分布格局及其驱动机制对于理解区域草地生态系统结构与功能的维持及其应对气候变化具有重要科学意义。以青海湖流域为研究对象,基于2023年7—8月的实地采样数据与遥感数据,采用数理统计、相关分析和结构方程模型等多种方法研究了青海湖流域草地植被生物量(包括地上和地下生物量)的空间分布特征及其驱动路径。结果表明:(1) 不同草地植被类型生物量差异显著,草甸类高于草原类,地上生物量(AGB)以山地灌丛草甸最高(311.54 g·m-2),山地泥流草甸最低(64.67 g·m-2);地下生物量(BGB)以矮生嵩草草甸最高(3534.05 g·m-2),红景天荒漠最低(339.12 g·m-2)。(2) AGB高值主要集中于沙柳河流域中下游和环湖地区南部,BGB和总生物量(TB)高值区主要位于布哈河中游、泉吉河流域、恰当曲流域和沙柳河中游;低海拔地区具备更适宜的温度和肥沃的土壤,促进地上部分生长;高海拔地区因寒冷和土壤贫瘠,植物倾向于增强根系发育以提高资源获取能力。(3) 生态系统碳利用效率(CUE)(总效益-0.44)和土壤容重(BD)(总效益-0.59)是影响草地植被AGB和BGB的直接因子。综上,青海湖流域草地植被受植被类型和区域环境的共同影响,CUE和BD是主要因素。研究结果可为深入认识青海湖流域草地植被生物量空间规律和生态系统保护与恢复提供基础数据和科学依据。

关键词: 根冠比, 空间分布, 地上-地下生物量, 青海湖流域

Abstract:

Grassland vegetation biomass is a key indicator of grassland ecosystem productivity and carbon storage. Its spatial distribution pattern and driving mechanisms are of great scientific significance for understanding the maintenance of regional grassland ecosystem structure and function and their responses to climate change. Taking the Qinghai Lake Basin as the study area, this research integrates field sampling data (collected in July-August 2023) and remote sensing data to analyze the spatial distribution characteristics of grassland vegetation biomass (including aboveground and belowground components) and to explore its driving pathways using statistical analysis, correlation analysis, and structural equation modeling. The results reveal (1) Significant differences in biomass among different vegetation types, with meadow types demonstrating higher values than steppe types. Aboveground biomass is highest in mountain shrub meadows (311.54 g·m-2) and lowest in mountain solifluction meadows (64.67 g·m-2), whereas belowground biomass is highest in dwarf kobresia meadows (3534.05 g·m-2) and lowest in rhodiola desert (339.12 g·m-2). (2) High aboveground biomass values are primarily concentrated in the middle and lower reaches of the Shaliu River Basin and the southern region surrounding the lake, whereas the high-value areas for belowground and total biomass are primarily located in the middle reaches of the Buha River, the Quanji River, the Qiadangqu River Basin and middle reaches of the Shaliu River. Lower altitude areas provide more suitable temperatures and fertile soil, thereby promoting the growth of aboveground parts. Conversely, due to colder conditions and poorer soils, higher altitude regions drive plants to enhance root system development and improve resource acquisition capacity. (3) Structural equation modeling revealed that ecosystem carbon use efficiency (total effect: -0.44) and soil bulk density (total effect: -0.59) were direct factors affecting both aboveground and belowground biomass of grassland vegetation. In conclusion, vegetation type, and regional environment collectively affected grassland vegetation in the Qinghai Lake Basin, identifying ecosystem carbon use efficiency and soil bulk density as the primary determinants. This study provides critical data and scientific support for understanding vegetation biomass spatial patterns and for guiding grassland conservation and restoration in the Qinghai Lake Basin.

Key words: root-shoot ratio, spatial distribution, above-ground biomass, Qinghai Lake Basin