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- Title
长期缺素施肥及石灰石膏施用对江西鹰潭红壤 反硝化微生物功能基因丰度的影响.
- Authors
段春健; 宛 颂; 叶桂萍; 樊剑波; 王全成; 贺纪正; 林永新; (
- Abstract
The abundance of denitrifying functional genes plays a key role in driving the soil nitrous oxide ( N2O) emission potential. Nitrite reductase genes (nirK and nirS) and nitrous oxide reductase genes (nosZI and nosZII) arc the dominant denitrifying functional genes. ln this study, real-time quantitative PCB. was conducted to evaluate the effects of 32-ycar imbalanced fertilization and lime and gypsum additions on the abundances of nirK, nirS, nosZ I and nosZ II genes in an Ultisol al Yingtan, Jiangxi Province. We further explored the underlying driving factors. The results showed that, compared with the balanced fertilization treatment, fertilization without phosphorus (P) significantly decreased the abundances of nirK, nirS, nosZ I and nosZ II genes. Fertilization without nitrogen (N) significantly reduced the abundances of nirK, nosZ I and nosZ II, but did not affect the abundance of nirS. Fertilization without potassium ( K) did not affect the abundances of all denitrifying functional genes. Results of stepwise regression analysis and random forest analysis showed that soil pH was a key environmental factor affecting the abundances of nos ZI and nos Z II. The application of lime or lime + gypsum significantly increased soil pll, which subsequently increased the abundances of nosZ II and nosZ Il/nosZ I by 150%-231% and 127%-155%, respectively. Our results suggested that application of lime or lime + gypsum favored nosZ II more than nosZ I in upland Ultisols, which might enhance the relative importance of nosZ II in N/) reduelion. Overall, fertilization without P would reduce denitrifying gene abundances, while the application of lime or lime + gypsLtm enriched nosZ II and increased ratio of nosZ Il/nosZ I, which might be beneficial for reducing N 2 0 emission polential in the Ultisols.
- Subjects
JIANGXI Sheng (China); NITRITE reductase; RANDOM forest algorithms; ULTISOLS; NITROUS oxide; SOIL acidity; GYPSUM; POTASSIUM fertilizers
- Publication
Yingyong Shengtai Xuebao, 2021, Vol 32, Issue 6, p2209
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/J.1001-9332.202106.033