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| Impacts of straw return coupled with nitrogen fertilization on the enzyme activities of rice rhizosphere soils |
| Received:September 07, 2022 |
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| KeyWord:straw return;rhizosphere;non-rhizosphere;nitrogen fertilizer application;enzyme activities |
| Author Name | Affiliation | E-mail | | CHEN Pei | Institute of Agricultural Resource and Environment, Jiangsu Academy of Agricultural Sciences/Key Agricultural Environment Laboratory of the Lower Yangtze River Plain of Ministry of Agriculture and Rural Affairs of China, Nanjing 210014, China
School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China | | | LUO Jialin | Institute of Agricultural Resource and Environment, Jiangsu Academy of Agricultural Sciences/Key Agricultural Environment Laboratory of the Lower Yangtze River Plain of Ministry of Agriculture and Rural Affairs of China, Nanjing 210014, China | | | HUANG Liying | Institute of Agricultural Resource and Environment, Jiangsu Academy of Agricultural Sciences/Key Agricultural Environment Laboratory of the Lower Yangtze River Plain of Ministry of Agriculture and Rural Affairs of China, Nanjing 210014, China
Suzhou Polytechnic Institute of Agriculture, Suzhou 215000, China | | | WANG Ning | Institute of Agricultural Resource and Environment, Jiangsu Academy of Agricultural Sciences/Key Agricultural Environment Laboratory of the Lower Yangtze River Plain of Ministry of Agriculture and Rural Affairs of China, Nanjing 210014, China
School of the Environment and safety Engineering, Jiangsu University, Zhenjiang 212001, China | wang.ning4113@163.com | | YU Jianguang | Institute of Agricultural Resource and Environment, Jiangsu Academy of Agricultural Sciences/Key Agricultural Environment Laboratory of the Lower Yangtze River Plain of Ministry of Agriculture and Rural Affairs of China, Nanjing 210014, China
School of the Environment and safety Engineering, Jiangsu University, Zhenjiang 212001, China | | | XUE Lihong | Institute of Agricultural Resource and Environment, Jiangsu Academy of Agricultural Sciences/Key Agricultural Environment Laboratory of the Lower Yangtze River Plain of Ministry of Agriculture and Rural Affairs of China, Nanjing 210014, China
School of the Environment and safety Engineering, Jiangsu University, Zhenjiang 212001, China | |
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| Abstract: |
| To explore the response mechanisms of enzyme activities of rhizosphere soils to straw return coupled with nitrogen fertilization, two types of paddy soils were collected, added to wheat straw, and used for rice seedling growth under greenhouse conditions. The specific objectives were to explore the effect of combination of straw return with nitrogen fertilizer addition on the activities of dehydrogenase, protease, urease, nitrate reductase, nitrite reductase, and hydroxylamine reductase in non-rhizosphere, as well as on the rhizosphere soils based on the rhizo-bags method. There were three treatments:straw return without nitrogen addition(S), straw return with conventional application ratio of nitrogen addition(SN), and straw return with higher application ratio of nitrogen addition(SHN). Results revealed that, compared to non-rhizosphere soil, the activities of dehydrogenase, urease, and hydroxylamine reductase in rhizosphere soils for all the treatments increased by 22.4%-48.7%, 13.4%-70.9%, and 12.4%-23.0%, respectively, and only the effect of S treatment on the increase of urease activity in the rhizosphere soil was not significant. Meanwhile, straw return combined with nitrogen fertilizer addition significantly increased the activities of protease for rhizosphere soil from Taizhou Jiangsu(TZ), nitrate reductase for rhizosphere soil from Changzhou Jiangsu(CZ), and nitrite reductase for TZ rhizosphere soil by 34.2%-44.7%, 243.8%-270.5%, and 49.6%-87.1%, respectively. Results also demonstrated that as nitrogen application rate increased, the activities of dehydrogenase, urease, and hydroxylamine reductase in rhizosphere and non-rhizosphere soils for all treatments increased by 14.2%-62.7%, 8.2%-54.4%, and 3.8%-18.0%(except urease in non-rhizosphere of CZ soil and hydroxylamine reductase of SN treatment in non-rhizosphere of TZ soil), respectively. In contrast from the above three soil enzyme types, the response of other types of soil enzyme to nitrogen fertilizer application varied between non-rhizosphere and rhizosphere. Principal component analysis revealed that soil type, rhizosphere, and nitrogen fertilizer application were important factors for influencing soil enzyme activities, and the application of nitrogen fertilizer significantly altered the enzyme activities of non-rhizosphere and rhizosphere soil. Variance partitioning analysis indicated that the three factors explained the variation in soil enzyme activities by 63.5%, and the roles of rhizosphere and nitrogen application were more important, explaining by 32.8% and 20.8% of the alteration in soil enzyme activities, respectively. |
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