Soil carbon mineralization following biochar addition associated with external nitrogen

Biochar has been attracting increasing attention for its potentials of C sequestration and soil amendment. This study aimed to understand the effects of combining biochar with additional external N on soil C mineralization. A typical red soil (Plinthudults) was treated with two biochars made from tw...

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Autores principales:	Zhao,Rudong, Coles,Neil, Wu,Jiaping
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2015
Materias:	Biochar carbon sequestration nitrogen soil amendment
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392015000500012
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spelling	oai:scielo:S0718-583920150005000122018-10-01Soil carbon mineralization following biochar addition associated with external nitrogenZhao,RudongColes,NeilWu,Jiaping Biochar carbon sequestration nitrogen soil amendment Biochar has been attracting increasing attention for its potentials of C sequestration and soil amendment. This study aimed to understand the effects of combining biochar with additional external N on soil C mineralization. A typical red soil (Plinthudults) was treated with two biochars made from two types of plantation-tree trunks (soil-biochar treatments), and was also treated with external N (soil-biochar-N treatments). All treatments were incubated for 42 d. The CO2-C released from the treatments was detected periodically. After the incubation, soil properties such as pH, microbial biomass C (MBC), and microbial biomass N (MBN) were measured. The addition of biochar with external N increased the soil pH (4.31-4.33) compared to the soil treated with external N only (4.21). This was not observed in the comparison of soil-biochar treatments (4.75-4.80) to soil only (4.74). Biochar additions (whether or not they were associated with external N) increased soil MBC and MBN, but decreased CO2-C value per unit total C (added biochar C + soil C) according to the model fitting. The total CO2-C released in soil-biochar treatments were enhanced compared to soil only (i.e., 3.15 vs. 2.57 mg and 3.23 vs. 2.45 mg), which was attributed to the labile C fractions in the biochars and through soil microorganism enhancement. However, there were few changes in soil C mineralization in soil-biochar-N treatments. Additionally, the potentially available C per unit total C in soil-biochar-N treatments was lower than that observed in the soil-biochar treatments. Therefore, we believe in the short term, that C mineralization in the soil can be enhanced by biochar addition, but not by adding external N concomitantly.info:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.75 n.4 20152015-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392015000500012en10.4067/S0718-58392015000500012
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Biochar carbon sequestration nitrogen soil amendment
spellingShingle	Biochar carbon sequestration nitrogen soil amendment Zhao,Rudong Coles,Neil Wu,Jiaping Soil carbon mineralization following biochar addition associated with external nitrogen
description	Biochar has been attracting increasing attention for its potentials of C sequestration and soil amendment. This study aimed to understand the effects of combining biochar with additional external N on soil C mineralization. A typical red soil (Plinthudults) was treated with two biochars made from two types of plantation-tree trunks (soil-biochar treatments), and was also treated with external N (soil-biochar-N treatments). All treatments were incubated for 42 d. The CO2-C released from the treatments was detected periodically. After the incubation, soil properties such as pH, microbial biomass C (MBC), and microbial biomass N (MBN) were measured. The addition of biochar with external N increased the soil pH (4.31-4.33) compared to the soil treated with external N only (4.21). This was not observed in the comparison of soil-biochar treatments (4.75-4.80) to soil only (4.74). Biochar additions (whether or not they were associated with external N) increased soil MBC and MBN, but decreased CO2-C value per unit total C (added biochar C + soil C) according to the model fitting. The total CO2-C released in soil-biochar treatments were enhanced compared to soil only (i.e., 3.15 vs. 2.57 mg and 3.23 vs. 2.45 mg), which was attributed to the labile C fractions in the biochars and through soil microorganism enhancement. However, there were few changes in soil C mineralization in soil-biochar-N treatments. Additionally, the potentially available C per unit total C in soil-biochar-N treatments was lower than that observed in the soil-biochar treatments. Therefore, we believe in the short term, that C mineralization in the soil can be enhanced by biochar addition, but not by adding external N concomitantly.
author	Zhao,Rudong Coles,Neil Wu,Jiaping
author_facet	Zhao,Rudong Coles,Neil Wu,Jiaping
author_sort	Zhao,Rudong
title	Soil carbon mineralization following biochar addition associated with external nitrogen
title_short	Soil carbon mineralization following biochar addition associated with external nitrogen
title_full	Soil carbon mineralization following biochar addition associated with external nitrogen
title_fullStr	Soil carbon mineralization following biochar addition associated with external nitrogen
title_full_unstemmed	Soil carbon mineralization following biochar addition associated with external nitrogen
title_sort	soil carbon mineralization following biochar addition associated with external nitrogen
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2015
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392015000500012
work_keys_str_mv	AT zhaorudong soilcarbonmineralizationfollowingbiocharadditionassociatedwithexternalnitrogen AT colesneil soilcarbonmineralizationfollowingbiocharadditionassociatedwithexternalnitrogen AT wujiaping soilcarbonmineralizationfollowingbiocharadditionassociatedwithexternalnitrogen
_version_	1714205353995927552

Soil carbon mineralization following biochar addition associated with external nitrogen

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