气候变化领域集成服务门户(CCPortal): Including soil depth as a predictor variable increases prediction accuracy of SOC stocks

CCPortal

DOI	10.1016/j.still.2024.106007
	Including soil depth as a predictor variable increases prediction accuracy of SOC stocks
	Li, Jiaying; Liu, Feng; Shi, Wenjiao; Du, Zhengping; Deng, Xiangzheng; Ma, Yuxin; Shi, Xiaoli; Zhang, Mo; Li, Qiquan
发表日期	2024
ISSN	0167-1987
EISSN	1879-3444
起始页码	238
卷号	238
英文摘要	Accurate estimates of soil organic carbon (SOC) stocks are important in understanding terrestrial carbon cycling. Based on the fundamental theorem of surfaces, an alternative method, high accuracy surface modelling (HASM) combined with soil depth information was applied to predict the spatial pattern of SOC stocks in Hebei Province, China. In this study, we collected 434 soil samples and key environmental covariates related to soil-forming factors (soil, climate, organisms, topography, and soil depth information) in the study area, and compared the accuracy of 16 spatial prediction models (including single models, hybrid models, and HASM combined with single or hybrid models) on the spatial distribution of SOC stocks. The results confirmed that the method of HASM combined with the generalized additive model (GAM) with soil depth covariate (HASM_GAMD) achieved a better performance than other methods at soil depths of 0-30, 0-100 and 0-200 cm. The root-mean-square error and coefficient of determination values of predicting the spatial pattern of SOC stocks by the HASM_GAMD model demonstrated a 43% and 49% improvement, respectively, compared with models without depth information. The prediction uncertainty of the HASM_GAMD model based on 90% prediction interval was lower than that of other models. The HASM_GAMD model excels in addressing not only the nonlinear relationship between covariates and SOC stocks, but also in incorporating point observation data that varies with soil depth. Furthermore, the model conducts modelling by integrating surface and optimal control theories. Results obtained from the HASM_GAMD demonstrated that the SOC stocks in Hebei Province amounted to 1449.08 Tg C. Our study introduces an alternative model for modelling of SOC stocks and our findings are a valuable reference for assessing carbon stocks in Hebei Province to support sustainable land management and climate change mitigation.
英文关键词	High accuracy surface modelling; Interpolation; Linear model; Machine learning model; Soil organic carbon stocks
语种	英语
WOS研究方向	Agriculture
WOS类目	Soil Science
WOS记录号	WOS:001174772600001
来源期刊	SOIL & TILLAGE RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/302511
作者单位	Chinese Academy of Sciences; Institute of Geographic Sciences & Natural Resources Research, CAS; Hebei Normal University; Hebei Normal University; Chinese Academy of Sciences; Nanjing Institute of Soil Science, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences; Institute of Geographic Sciences & Natural Resources Research, CAS; Landcare Research - New Zealand; Sichuan Agricultural University; Chinese Academy of Sciences; Institute of Geographic Sciences & Natural Resources Research, CAS
推荐引用方式 GB/T 7714	Li, Jiaying,Liu, Feng,Shi, Wenjiao,et al. Including soil depth as a predictor variable increases prediction accuracy of SOC stocks[J],2024,238.
APA	Li, Jiaying.,Liu, Feng.,Shi, Wenjiao.,Du, Zhengping.,Deng, Xiangzheng.,...&Li, Qiquan.(2024).Including soil depth as a predictor variable increases prediction accuracy of SOC stocks.SOIL & TILLAGE RESEARCH,238.
MLA	Li, Jiaying,et al."Including soil depth as a predictor variable increases prediction accuracy of SOC stocks".SOIL & TILLAGE RESEARCH 238(2024).