2000—2020年蒙古国植被净初级生产力时空演变特征及其影响因素

doi:10.12118/j.issn.1000-6060.2024.609

Abstract

Abstract:

Mongolia, China’s northern neighbor, has a grassland ecosystem that is highly susceptible to natural factors and human activities. A univariate linear regression model was used to analyze the spatiotemporal variations in net primary productivity (NPP) of vegetation in Mongolia from 2000 to 2020. A random forest regression model, combined with the Gridded Livestock of the World (GLW) dataset, was used to simulate livestock grazing density in Mongolia for 2020. The geographic detector method was then utilized to examine the factors influencing NPP changes at both national and provincial scales, incorporating indicators such as average annualland surface temperature, average annual precipitation, downward shortwave radiation, soil moisture, NO₂ emissions, and the human footprint index. The results indicated that: (1) From 2000 to 2020, the NPP in Mongolia exhibited spatial characteristics of increasing in the east and north and decreasing in the west and south. There is an overall increasing trend, dominated by nonsignificant increases, with nonsignificantly increasing areas accounting for 62.539% of Mongolia’s land area. (2) Single-factor analysis revealed that climatic factors were the primary drivers of NPP changes in Mongolia, with downward shortwave radiation (q=0.615) and average annual precipitation (q=0.602) showing the highest contribution. However, the interactions between the human footprint index or NO₂ emissions and climatic factors exceeded the explanatory power of individual factors. (3) At the provincial-scale, climate and topography remained the main drivers of NPP changes in the eastern and western regions of Mongolia. In contrast, NPP changes in the Central and Khangai regions of Mongolia were more influenced by the interaction between human activities (grazing density and NO₂ emissions) and natural factors, making these areas critical for the prevention and control of future grassland degradation risk. These findings provide scientific insights for the effective management of grassland ecosystems in various regions of Mongolia and for the formulation of sustainable development strategies.

Key words: NPP, spatial and temporal changes, influencing factors, grazing density, Mongolia

HUANG Jing, LI Ting, LI Pengfei, Altansukh OCHIR, YANG Meihuan, WANG Tao, LI Sha. Spatiotemporal evolution characteristics and its influencing factors of net primary productivity of vegetation in Mongolia form 2000 to 2020[J].Arid Land Geography, 2025, 48(9): 1541-1554.

Figures/Tables 9

Fig. 1

Tab. 1

Tab. 2

Types of interaction"

判断标准	交互作用类型
$q (X 1 ⋂ X 2 M i n [q (X 1), q (X 2)]$	非线性减弱
$q (X 1 ⋂ X 2 M a x [(q (X 1), q (X 2)]$	双因子增强
$q (X 1 ⋂ X 2) = q (X 1) + q (X 2$	独立
$M i n [q (X 1), q (X 2)] q (X 1 ⋂ X 2 M a x [(q (X 1), q (X 2)]$	非线性增强
$q (X 1 ⋂ X 2 q (X 1) + q (X 2$	单因子非线性减弱

Tab. 2

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

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数据类型	数据年份	空间分辨率	数据来源
蒙古国省域边界	-	-	蒙古国国家统计信息服务网（http://www.1212.mn/）
净初级生产力（NPP）	2000—2020	500 m	国家地球系统科学数据中心（https://www.geodata.cn/aboutus.html）
NO₂排放量	2000—2020	0.008°	美国国家航空航天局（NASA）（https://science.nasa.gov/solar-system/）
世界网格化牲畜数据集	2015	1 km	联合国粮食及农业组织（https://dataverse.harvard.edu/）
风速	2000—2020	1 km	谷歌地球引擎（https://code.earthengine.google.com/）
数字高程模型（DEM）	2020	30 m	国家冰川冻土沙漠科学中心（http://www.ncdc.ac.cn/portal/）
年均地表温度	2003—2019	1 km	青藏高原数据中心（https://data.tpdc.ac.cn/home）
实际蒸散发	2000—2020	1 km	青藏高原数据中心（https://data.tpdc.ac.cn/home）
年均降水量	2000—2020	1 km	欧洲气象卫星局（https://cds.climate.copernicus.eu/cdsapp#!/search?type=dataset）
土壤水分	2000—2020	1 km	谷歌地球引擎（https://code.earthengine.google.com/）
人类足迹指数	2000—2020	1 km	科学数据银行（https://www.scidb.cn/list）
夜间灯光	2000—2020	500 m	国家地球系统科学数据中心（https://www.geodata.cn/aboutus.html）
土地利用/覆盖	2000—2020	30 m	地球大数据科学与工程数据中心（https://data.casearth.cn/）
人口密度	2000—2020	1 km	美国国家实验室（https://landscan.ornl.gov/）
下行短波辐射	2000—2020	1 km	欧洲气象中心（https://www.ecmwf.int）

Spatiotemporal evolution characteristics and its influencing factors of net primary productivity of vegetation in Mongolia form 2000 to 2020

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