农业生态环境-土壤微生物合辑Agro-ecosystem & Environment—Soil microbe
|Effects of long-term straw return on soil organic carbon fractions and enzyme activities in a double-cropped rice paddy in South China
|HUANG Wan, WU Jian-fu, PAN Xiao-hua, TAN Xue-ming, ZENG Yong-jun, SHI Qing-hua, LIU Tao-ju, ZENG Yan-hua
|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.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 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.
Received: 01 January 2020
|Fund: This work was supported by the National Key Research and Development Program of China (2017YFD0301601), the China Postdoctoral Science Foundation (2016M600512), the Open Project Program of State Key Laboratory of Rice Biology, Ministry of Science and Technology, China (20190401), and the Jiangxi Province Postdoctoral Research Project Preferential Grant, China (2017KY16).
Correspondence ZENG Yan-hua, Tel: +86-791-83850663, E-mail: zyh74049501 @163.com
|About author: HUANG Wan, E-mail: email@example.com;
Cite this article:
HUANG Wan, WU Jian-fu, PAN Xiao-hua, TAN Xue-ming, ZENG Yong-jun, SHI Qing-hua, LIU Tao-ju, ZENG Yan-hua.
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, 20(1): 236-247.
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