Methods of evaluating soil bulk density: Impact on estimating large scale soil organic carbon storage
Xu, L; He, NP; Yu, GR
2016
Source PublicationCATENA
ISSN0341-8162
Volume144Pages:94-101
AbstractBulk density (BD) is one of the most important parameters used to calculate soil organic carbon (SOC) storage. Differences in the methods available to substitute missing BD data, including mean, median, and pedo-transfer functions (PTFs), are considered the main reason for the high uncertainty in SOC storage estimations at large scales. In this study, we used the measured BD and SOC contents of 1007 soil profiles to evaluate the accuracy of six BD substitution methods (two mean methods, a median method, and three PTF5). The results showed that PTFs underestimated SOC storage by 8% in the 0-20 cm soil layer, while mean and median methods overestimated SOC storage by 45% and 51%, respectively. Furthermore, the accuracy of PTFs estimates decreased with increasing soil depth. Relative to the measured values, and based on mean errors; root mean square errors, and method efficiency, the PFTs estimates were more accurate than those of the mean and median methods. Estimation bias increased with increasing SOC content for all methods, but differed among different soil types. The results of this study demonstrate that PTFs provide mote accurate estimates of SOC storage when the extent of Missing BD is substantial. Furthermore, the results provide new insights into establishing optimized PTFs, which contain more soil properties and piecewise functions of SOC content, in order to improve SOC storage estimates at large scales. (C) 2016 Elsevier B.V. All rights reserved.
SubtypeJournal
KeywordSoil organic carbon Pedo-transfer functions Mean Median Bulk density Soil type
Subject AreaGeology ; Agriculture ; Water Resources
WOS Subject ExtendedGeosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS KeywordPEDOTRANSFER FUNCTIONS ; VERTICAL-DISTRIBUTION ; CHEMICAL-PROPERTIES ; FOREST ECOSYSTEM ; CHINA ; MATTER ; QUALITY ; SYSTEM ; STOCKS
Indexed BySCI
Language英语
WOS IDWOS:000379375900010
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44193
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Xu, L,He, NP,Yu, GR. Methods of evaluating soil bulk density: Impact on estimating large scale soil organic carbon storage[J]. CATENA,2016,144:94-101.
APA Xu, L,He, NP,&Yu, GR.(2016).Methods of evaluating soil bulk density: Impact on estimating large scale soil organic carbon storage.CATENA,144,94-101.
MLA Xu, L,et al."Methods of evaluating soil bulk density: Impact on estimating large scale soil organic carbon storage".CATENA 144(2016):94-101.
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