气候变化领域集成服务门户(CCPortal): Predicting water retention of biochar-amended soil from independent measurements of biochar and soil properties

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DOI	10.1016/j.advwatres.2020.103638
	Predicting water retention of biochar-amended soil from independent measurements of biochar and soil properties
	Yi S.; Chang N.Y.; Imhoff P.T.
发表日期	2020
ISSN	0309-1708
卷号	142
英文摘要	Biochar is black carbon produced from pyrolysis of biomass and may be added to soil to sequester carbon and improve soil water retention. To date models to predict changes in soil water retention with biochar amendment are still missing and therefore direct measurements are required for every biochar/soil combination, which can be time-consuming. Here, a predictive model for biochar's effect on soil water retention was developed and tested that includes water retained in biochar intrapores and biochar's impact on interpores between particles. The independently measured parameters needed for the model are the particle size distributions (PSDs) and particle densities for biochar and soil, water retention data for biochar-free soil, biochar intrapore volume distribution from mercury porosimetry, amount of biochar added, bulk density of the biochar/soil mixture, and dew point potentiometer measurements of biochar. The model was tested using poultry litter and wood biochars amended to two soils (sand and sandy loam) at 2 and 7% mass fraction. The model predicted changes in the soil water characteristic well for the biochar amendment, with RMSE decreasing by ~50% when the full model was used. Model predictions of the change in available water capacity with biochar amendment for eight biochar/soil combinations had an average absolute error of 0.017 ± 0.006 and an average relative error of 10¯0 ± 40%. The model correctly predicted the increase in available water content when sandy loam was amended with wood biochar, and the decrease if amended with poultry litter biochar. The model provides an improved understanding of the mechanisms by which biochar alters water retention, and a means to estimate the initial change in available water capacity for a particular biochar/soil combination if necessary biochar and soil properties are measured. © 2020
关键词	Carbon Forecasting Particle size Soil conditioners Soil moisture Voltage dividers Available water capacities Available water contents Average absolute error Average relative error Independent measurement Soil water characteristics Soil water retention Volume distributions Soil surveys biochar black carbon measurement method particle size prediction pyrolysis size distribution soil amendment soil property soil water water content water retention
语种	英语
来源机构	Advances in Water Resources
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/131757
推荐引用方式 GB/T 7714	Yi S.,Chang N.Y.,Imhoff P.T.. Predicting water retention of biochar-amended soil from independent measurements of biochar and soil properties[J]. Advances in Water Resources,2020,142.
APA	Yi S.,Chang N.Y.,&Imhoff P.T..(2020).Predicting water retention of biochar-amended soil from independent measurements of biochar and soil properties.,142.
MLA	Yi S.,et al."Predicting water retention of biochar-amended soil from independent measurements of biochar and soil properties".142(2020).