Simulation of Soil Organic Carbon and Analysis on its Influencing Factors in Zhangye Grassland Based on CENTURY Model

doi:10.11733/j.issn.1007-0435.2023.04.027

Acta Agrestia Sinica ›› 2023, Vol. 31 ›› Issue (4): 1173-1185.DOI: 10.11733/j.issn.1007-0435.2023.04.027

Simulation of Soil Organic Carbon and Analysis on its Influencing Factors in Zhangye Grassland Based on CENTURY Model

WANG Xin-jing¹, ZHANG Mei-ling¹, YANG Min-cong¹, SUN Qian¹, XU Shi-bo¹, XU Yu-juan², HUANG Shan-feng², GAO Zhi-wen²

1. College of Science, Gansu Agricultural University, Lanzhou, Gansu Province 730070, China;
2. Climate Bridge (Shanghai) Ltd., Shanghai 200120, China

Received:2022-10-25 Revised:2023-01-26 Published:2023-04-28

基于CENTURY模型的张掖草地土壤有机碳模拟及影响因素研究

王鑫婧¹, 张美玲¹, 杨敏聪¹, 孙倩¹, 徐士博¹, 徐玉娟², 黄山枫², 高志文²

1. 甘肃农业大学理学院/数量生物学研究中心, 甘肃兰州 730070;
2. 环保桥(上海)环境技术有限公司, 上海 200120

通讯作者: 张美玲,E-mail:zhangml@gsau.edu.cn
作者简介:王鑫婧(1999-),女,汉族,河北张家口人,硕士研究生,主要从事生态与环境统计研究,E-mail:1638586881@qq.com
基金资助:
国家自然科学基金(32260353)；甘肃省重点研发计划(21YF5WA096)；科技部高端外国专家引进计划(G2022042009L)；横向基金(GSAU-JSFW-2022-20)；甘肃省自然科学基金项目(1606RJZA077,1308RJZA262)资助

Abstract

Abstract: Studying the spatial and temporal distribution and influencing factors of soil organic carbon in grassland is conducive to promoting the management of regional ecosystem carbon sinks,which is of great significance for achieving the goal of “dual carbon”. Taking the grassland of Zhangye district as the research object,the CENTURY model is used to simulate the soil organic carbon density of the grassland in Zhangye,and the structural equation model is used to analyze the action path and intensity of various environmental factors on the grassland soil organic carbon. The results show that the total soil organic carbon density showed an increasing trend from 1970 to 2022,which is consistent with the change trend of slow and inert soil organic carbon. Soil Organic carbon density shows high in southeast and low in northwest. The high-value areas of total organic carbon density are mainly located in the southeast of Sunan County and Minle County,the Gaotai，Linze and Ganzhou district are relatively low. Altitude and annual precipitation has positive effects on total soil organic carbon density,while annual average temperature,soil water content and pH value has negative effects. The direct effect of annual average temperature is the largest,and altitude indirectly affects soil organic carbon density by affecting precipitation,temperature and pH value,and precipitation not only has a direct impact on soil organic carbon density,but also indirectly affects soil organic carbon density by affecting soil water content and pH value.

Key words: Soil organic carbon density, CENTURY model, Spatiotemporal distribution, Kriging interpolation, Structural equation model

摘要： 研究草地土壤有机碳的时空分布及影响因素有利于推动区域生态系统碳汇管理，对实现“双碳”目标有重要意义。以张掖草地为研究对象，运用CENTURY模型模拟张掖草地土壤有机碳密度，采用结构方程模型分析各环境因子对草地土壤有机碳的作用路径及强度。结果表明：1970—2022年土壤总有机碳密度呈增长趋势，与缓性及惰性土壤有机碳的变化趋势较为一致；有机碳密度呈现东南高，西北低的空间分布格局；总有机碳密度的高值区主要是肃南县的东南部与民乐县，高台、临泽、甘州区相对较低；海拔、年降水量对土壤总有机碳密度存在正效应，而年均温度、土壤含水量、pH值是负效应。年均温度的直接效应最大，海拔通过影响降水、温度和pH值等间接影响土壤有机碳密度，降水量对土壤有机碳密度不仅有直接影响，还会通过影响土壤含水量、pH值等间接影响土壤有机碳密度。

关键词: 土壤有机碳密度, CENTURY模型, 时空分布, 克里金插值, 结构方程模型

CLC Number:

S812.2

WANG Xin-jing, ZHANG Mei-ling, YANG Min-cong, SUN Qian, XU Shi-bo, XU Yu-juan, HUANG Shan-feng, GAO Zhi-wen. Simulation of Soil Organic Carbon and Analysis on its Influencing Factors in Zhangye Grassland Based on CENTURY Model[J]. Acta Agrestia Sinica, 2023, 31(4): 1173-1185.

王鑫婧, 张美玲, 杨敏聪, 孙倩, 徐士博, 徐玉娟, 黄山枫, 高志文. 基于CENTURY模型的张掖草地土壤有机碳模拟及影响因素研究[J]. 草地学报, 2023, 31(4): 1173-1185.

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Simulation of Soil Organic Carbon and Analysis on its Influencing Factors in Zhangye Grassland Based on CENTURY Model

基于CENTURY模型的张掖草地土壤有机碳模拟及影响因素研究

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