Spatial Variability Characteritics and Driving Mechanism of Vegetation Productivity of the Northern Grassland in Inner Mongolia， China

doi:10.11733/j.issn.1007-0435.2025.08.027

Acta Agrestia Sinica ›› 2025, Vol. 33 ›› Issue (8): 2677-2684.DOI: 10.11733/j.issn.1007-0435.2025.08.027

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Spatial Variability Characteritics and Driving Mechanism of Vegetation Productivity of the Northern Grassland in Inner Mongolia， China

CHEN Meng-jiao^1,2, NIE Ze-xu³, HE Feng-yuan^1,2, LIU Xin-yan^1,2, REN Fei¹

1. State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining, Qinghai Province 810016, China;
2. College of Eco-Environmental Engineering, Qinghai University, Xining, Qinghai Province 810016, China;
3. College of Resource and Environment, University of Chinese Academy of Sciences, Beijing 101408, China

Received:2025-04-23 Revised:2025-04-29 Online:2025-08-15 Published:2025-08-27

中国北方草地植被生产力空间分异特征及驱动机制

陈梦娇^1,2, 聂泽旭³, 何丰媛^1,2, 刘鑫燕^1,2, 任飞¹

1. 青海大学省部共建三江源生态与高原农牧业国家重点实验室, 青海西宁 810016;
2. 青海大学生态环境工程学院, 青海西宁 810016;
3. 中国科学院大学资源与环境学院, 北京 101408

通讯作者: 任飞, E-mail:fei_ren2016@qhu.edu.cn
作者简介:陈梦娇(1996-),女,汉族,河南郑州人,硕士研究生,主要从事草地生态学研究,E-mail:mengjiao_chen@qhu.edu.cn
基金资助:
国家自然科学基金项目（U21A20185， 31901171）；青海省“昆仑英才·高端创新创业人才”项目资助

Abstract

Abstract: Based on multi-source remote sensing data， through the calculation of various parameters during the rapid growth period， combined with methods such as analysis of variance， correlation analysis and structural equation model， in this study we analyzed the distribution characteristics and driving mechanisms of the total primary productivity of vegetation in meadow steppe， typical steppe and desert steppe in Inner Mongolia region of northern China from 2000 to 2018. The results showed that the total primary productivity of meadow steppe is the highest （767.5 g·m^-2）， significantly higher than that of typical steppe （429.1 g·m^-2） and desert steppe （112.7 g·m^-2）. Crucially， productivity regulation was principally mediated through growth rate modulation during the rapid growth phase （R²=0.90）， rather than the length of the rapid growth period. Soil moisture emerged as the paramount environmental controller of rapid growth phase dynamics， exhibiting differential influence along the aridity gradient-strongest in moisture-abundant meadow steppe （path coefficient=0.81） and progressively attenuated in typical steppe （0.73） and desert steppe （0.64）. These findings establish a hierarchical environmental control pathway： soil moisture → rapid growth rate → productivity， while demonstrating an inverse relationship between regulatory intensity of growth rate on productivity and ecosystem aridity （desert>typical>meadow）. The study further identifies diminishing moisture limitation on growth rates with increasing environmental aridity， providing critical insights for developing spatially differentiated grassland management strategies in water-limited ecosystems.

Key words: Steppe types, Fast growth phase, Growth rate, Spatial variability

摘要： 本研究基于多源遥感数据，通过快速生长期各参数计算，结合方差分析、相关分析和结构方程模型等方法，分析了中国北方草地内蒙古地区草甸草原、典型草原和荒漠草原2000—2018年植被总初级生产力的分布特征及驱动机制。结果显示：草甸草原的总初级生产力最高（767.5 g·m^-2），显著高于典型草原（429.1 g·m^-2）和荒漠草原（112.7 g·m^-2）。本区域草地植被总初级生产力主要由快速生长期的生长速率调控（R²=0.90），而非快速生长期长度。不同草地类型快速生长期生长速率的主导驱动因子均为土壤湿度，且草甸草原土壤湿度对生长速率的影响最高（路径系数为0.81），而荒漠草原最小（路径系数为0.64）。环境因子对中国北方草地内蒙古地区草地植被生产力的调控路径为“土壤湿度→快速生长期生长速率→生产力”，快速生长期生长速率对生产力的调控强度沿水分梯度呈现显著分异（荒漠草原>典型草原>草甸草原），土壤湿度对生长速率的限制效应随干旱程度加剧而衰减。

关键词: 草地类型, 快速生长期, 生长速率, 空间分异

CLC Number:

S812

CHEN Meng-jiao, NIE Ze-xu, HE Feng-yuan, LIU Xin-yan, REN Fei. Spatial Variability Characteritics and Driving Mechanism of Vegetation Productivity of the Northern Grassland in Inner Mongolia， China[J]. Acta Agrestia Sinica, 2025, 33(8): 2677-2684.

陈梦娇, 聂泽旭, 何丰媛, 刘鑫燕, 任飞. 中国北方草地植被生产力空间分异特征及驱动机制[J]. 草地学报, 2025, 33(8): 2677-2684.

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Spatial Variability Characteritics and Driving Mechanism of Vegetation Productivity of the Northern Grassland in Inner Mongolia， China

中国北方草地植被生产力空间分异特征及驱动机制

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