Effects of long-term straw return on soil organic carbon fractions and enzyme activities in a double-cropped rice paddy in South China
Long-term straw return is an important carbon source for improving soil organic carbon (SOC) stocks in croplands, and straw removal through burning is also a common practice in open fields in South China. However, the specific effects of long-term rice straw management on SOC fractions, the related...
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Format: | Article |
Language: | English |
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Elsevier
2021-01-01
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Series: | Journal of Integrative Agriculture |
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Online Access: | http://www.sciencedirect.com/science/article/pii/S2095311920633470 |
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Article |
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DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Wan HUANG Jian-fu WU Xiao-hua PAN Xue-ming TAN Yong-jun ZENG Qing-hua SHI Tao-ju LIU Yan-hua ZENG |
spellingShingle |
Wan HUANG Jian-fu WU Xiao-hua PAN Xue-ming TAN Yong-jun ZENG Qing-hua SHI Tao-ju LIU Yan-hua ZENG Effects of long-term straw return on soil organic carbon fractions and enzyme activities in a double-cropped rice paddy in South China Journal of Integrative Agriculture double-cropped rice paddy system straw return straw burned return SOC fractions soil enzyme activities |
author_facet |
Wan HUANG Jian-fu WU Xiao-hua PAN Xue-ming TAN Yong-jun ZENG Qing-hua SHI Tao-ju LIU Yan-hua ZENG |
author_sort |
Wan HUANG |
title |
Effects of long-term straw return on soil organic carbon fractions and enzyme activities in a double-cropped rice paddy in South China |
title_short |
Effects of long-term straw return on soil organic carbon fractions and enzyme activities in a double-cropped rice paddy in South China |
title_full |
Effects of long-term straw return on soil organic carbon fractions and enzyme activities in a double-cropped rice paddy in South China |
title_fullStr |
Effects of long-term straw return on soil organic carbon fractions and enzyme activities in a double-cropped rice paddy in South China |
title_full_unstemmed |
Effects of long-term straw return on soil organic carbon fractions and enzyme activities in a double-cropped rice paddy in South China |
title_sort |
effects of long-term straw return on soil organic carbon fractions and enzyme activities in a double-cropped rice paddy in south china |
publisher |
Elsevier |
series |
Journal of Integrative Agriculture |
issn |
2095-3119 |
publishDate |
2021-01-01 |
description |
Long-term straw return is an important carbon source for improving soil organic carbon (SOC) stocks in croplands, and straw removal through burning is also a common practice in open fields in South China. However, the specific effects of long-term rice straw management on SOC fractions, the related enzyme activities and their relationships, and whether these effects differ between crop growing seasons remain unknown. Three treatments with equal nitrogen, phosphorus, and potassium nutrient inputs, including straw/ash and chemical nutrients, were established to compare the effects of straw removal (CK), straw return (SR), and straw burned return (SBR). Compared to CK, long-term SR tended to improve the yield of early season rice (P=0.057), and significantly increased total organic carbon (TOC) and microbial biomass carbon (MBC) in double-cropped rice paddies. While SBR had no effect on TOC, it decreased light fraction organic carbon (LFOC) in early rice and easily oxidizable organic carbon (EOC) in late rice, significantly increased dissolved organic carbon (DOC), and significantly decreased soil pH. These results showed that MBC was the most sensitive indicator for assessing changes of SOC in the double-cropped rice system due to long-term straw return. In addition, the different effects on SOC fraction sizes between SR and SBR were attributed to the divergent trends in most of the soil enzyme activities in the early and late rice that mainly altered DOC, while DOC was positively affected by β-xylosidase in both early and late rice. We concluded that straw return was superior to straw burned return for improving SOC fractions, but the negative effects on soil enzyme activities in late rice require further research. |
topic |
double-cropped rice paddy system straw return straw burned return SOC fractions soil enzyme activities |
url |
http://www.sciencedirect.com/science/article/pii/S2095311920633470 |
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doaj-df55fd0b9bb24170933d756215c065212021-06-08T04:43:00ZengElsevierJournal of Integrative Agriculture2095-31192021-01-01201236247Effects of long-term straw return on soil organic carbon fractions and enzyme activities in a double-cropped rice paddy in South ChinaWan HUANG0Jian-fu WU1Xiao-hua PAN2Xue-ming TAN3Yong-jun ZENG4Qing-hua SHI5Tao-ju LIU6Yan-hua ZENG7Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Collaborative Innovation Center for the Modernization Production of Double Cropping Rice/College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, P.R.ChinaKey Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Collaborative Innovation Center for the Modernization Production of Double Cropping Rice/College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, P.R.ChinaKey Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Collaborative Innovation Center for the Modernization Production of Double Cropping Rice/College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, P.R.ChinaKey Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Collaborative Innovation Center for the Modernization Production of Double Cropping Rice/College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, P.R.ChinaKey Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Collaborative Innovation Center for the Modernization Production of Double Cropping Rice/College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, P.R.ChinaKey Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Collaborative Innovation Center for the Modernization Production of Double Cropping Rice/College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, P.R.ChinaKey Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Collaborative Innovation Center for the Modernization Production of Double Cropping Rice/College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, P.R.ChinaCorrespondence ZENG Yan-hua, Tel: +86-791-83850663; Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Collaborative Innovation Center for the Modernization Production of Double Cropping Rice/College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, P.R.ChinaLong-term straw return is an important carbon source for improving soil organic carbon (SOC) stocks in croplands, and straw removal through burning is also a common practice in open fields in South China. However, the specific effects of long-term rice straw management on SOC fractions, the related enzyme activities and their relationships, and whether these effects differ between crop growing seasons remain unknown. Three treatments with equal nitrogen, phosphorus, and potassium nutrient inputs, including straw/ash and chemical nutrients, were established to compare the effects of straw removal (CK), straw return (SR), and straw burned return (SBR). Compared to CK, long-term SR tended to improve the yield of early season rice (P=0.057), and significantly increased total organic carbon (TOC) and microbial biomass carbon (MBC) in double-cropped rice paddies. While SBR had no effect on TOC, it decreased light fraction organic carbon (LFOC) in early rice and easily oxidizable organic carbon (EOC) in late rice, significantly increased dissolved organic carbon (DOC), and significantly decreased soil pH. These results showed that MBC was the most sensitive indicator for assessing changes of SOC in the double-cropped rice system due to long-term straw return. In addition, the different effects on SOC fraction sizes between SR and SBR were attributed to the divergent trends in most of the soil enzyme activities in the early and late rice that mainly altered DOC, while DOC was positively affected by β-xylosidase in both early and late rice. We concluded that straw return was superior to straw burned return for improving SOC fractions, but the negative effects on soil enzyme activities in late rice require further research.http://www.sciencedirect.com/science/article/pii/S2095311920633470double-cropped rice paddy systemstraw returnstraw burned returnSOC fractionssoil enzyme activities |