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《Ecology and Environmental Sciences》 2019-03
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Effect of Decomposition Agent Dosage, Moisture Content, and Initial C/N Ratio on Decomposition of Rice Straw

ZHU Yaqi;WANG Shan;LIU Yong;CHEN Yinglong;KARIMAN Khalil;LIANG Jinming;WEN Yuanming;ZHOU Dingzhi;CHEN Zhanhao;ZHANG Mu;YI Xiu;Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education/School of Environmental Science and Engineering,Chang'an University;Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture/Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation;Guangdong Key Laboratory of Integrated Agro-Environmental Pollution Control and Management/Guangdong Institute of Eco-Environmental Science &Technology;The UWA Institute of Agriculture/UWA School of Agriculture and Environment, The University of Western Australia;Zhongshan Agricultural Science and Technology Extension Center;Shaxi Agricultural Service Center of Zhongshan City;  
In the present study, the effect of different "Jinkuizi" decomposition agent dosages(Factor A: A_0, A_(0.5), and A_(1.0); %),moisture contents(Factor B: B_(50), B_(60), and B_(70); %), and initial C/N ratios(Factor C: C_(20), C_(22), and C_(25)) on rice straw decomposition was investigated using an orthogonal test design, in order to find out the best initial conditions for decomposing straw and provide a scientific basis for decomposed straw returning to the fields. Decomposition indicators such as pH, germination index(GI), C/N ratio, decomposing ratio(DR), dissolved organic carbon(DOC), and ultraviolet spectral parameters(SUVA_(280), E_2/E_3, and A_(226-400))were analyzed. Results showed that during the decomposition period, the GI and DR values for all treatments gradually increased as the decomposition progressed. The C/N ratios for the A_0 B_(70) C_(25) and A_(0.5) B_(70) C_(22) treatments continuously decreased, while those for the other treatments first increased and then decreased. The DOC contents for the A_0 B_(50) C_(20) and A_(1.0) B_(70) C_(20) treatments first increased and then decreased, while there was an increasing trend for the other treatments. The variation of aromatic structure and humification degree of dissolved organic matter was well linked to the variations of ultraviolet spectral parameters obtained from the rice straw compost. At the end of the decomposition period, the p H, GI, and DR values(7.05, 34.9%, and 30.7%, respectively) declined dramatically, whereas the C/N ratio(25.7) was very high in the incompletely decomposed A_0 B_(50) C_(20) treatment. For all the employed treatments(except A_0 B_(50) C_(20)), the pH values were found in accordance with the required standard of compost maturity(8.00-9.00),while the higher GI values indicated low toxicity(≥50%) or fully decomposed state(≥80%). The C/N ratios for the A_0 B_(70) C_(25),A_(0.5) B_(70) C_(22), and A_(1.0) B_(60) C_(25)(13.1, 14.4, and 16.4, respectively) treatments were consistent with the best-fit value(15.0), and the highest DR value(47.1%) was found in the A_(0.5) B_(70) C_(22) treatment. The GI value could be inferred from ultraviolet spectral parameter detection, which provided an alternative evaluation method for determining whether the rice straw compost was fully decomposed.Under such controlled experimental conditions, the optimal initial requirements for rice straw decomposition were determined to be a decomposition agent dosage of 0.5%, moisture content of 70%, and initial C/N ratio of 25. Further analysis showed that the decomposition agent dosage had the greatest influence on the DOC content; the moisture content had the greatest influences on the C/N ratio, DR, SUVA_(280), E_2/E_3, and A_(226-400) values; and the initial C/N ratio had the greatest influences on the pH and GI values.
【Fund】: 中山市广东省科学院技术转移专项(2016G1FC0014);; 广东省养分资源循环利用与耕地保育重点实验室/农业部南方植物营养与肥料重点实验室开放课题(ZHS2018-02);; 广东省科技计划项目(农村科技领域)(2015A020208009);; 国家自然科学基金面上项目(41471246)
【CateGory Index】: S141.4
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