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- Title
秸秆还田配施氮肥对水稻根际土酶活性的影响.
- Authors
陈佩; 罗佳琳; 黄丽颖; 王宁; 于建光; 薛利红
- 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.
- Subjects
CHANGZHOU (Jiangsu Sheng, China); JIANGSU Sheng (China); NITROGEN fertilizers; NITRITE reductase; NITRATE reductase; SOIL classification; FERTILIZER application; SOIL enzymology
- Publication
Journal of Agro-Environment Science, 2023, Vol 42, Issue 10, p2264
- ISSN
1672-2043
- Publication type
Article
- DOI
10.11654/jaes.2022-0899