Effects of different tillage management on rhizosphere soil nitrogen mineralization and its extracellular enzyme activity in a double-cropping rice paddy field of southern China,Land Degradation & Development

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Effects of different tillage management on rhizosphere soil nitrogen mineralization and its extracellular enzyme activity in a double-cropping rice paddy field of southern China
Land Degradation & Development ( IF 4.7 ) Pub Date : 2021-08-28 , DOI: 10.1002/ldr.4081
Haiming Tang ₁ , Chao Li ₁ , Kaikai Cheng ₁ , Lihong Shi ₁ , Li Wen ₁ , Weiyan Li ₁ , Xiaoping Xiao ₁

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Soil extracellular enzyme activity plays an important role in regulating the process of nitrogen (N) mineralization in the paddy field. However, there is still limited information about how rhizosphere N mineralization and its extracellular enzyme activities respond to different tillage treatments in a double-cropping rice paddy fields of southern China. Therefore, the effects of 6-year (short-term) tillage management on rhizosphere soil acid hydrolysable N and its fractions, N mineralization, and its extracellular enzyme activities in a double-cropping rice paddy fields of southern China were studied and reported in this article. The field experiment included four tillage treatments: conventional tillage with crop residue incorporation (CT), rotary tillage with crop residue incorporation (RT), no-tillage with crop residue retention (NT), and rotary tillage with crop residue removed as a control (RTO). The results showed that rhizosphere soil total acid hydrolysable N and its fractions with CT, RT and NT treatments were higher than those with RTO treatment. Compared to RTO treatment, the rhizosphere soil total acid hydrolysable N content with CT and RT treatments was increased by 19.17% and 17.74%, respectively. Compared to RTO treatment, the rhizosphere soil aerobic and anaerobic N mineralization rates with CT and RT treatments were increased by 100.00% and 80.65%, and 43.02% and 33.72%, respectively. Rhizosphere soil extracellular enzyme activities with CT and RT treatments were higher than those with NT and RTO treatments. There was a positive correlation between rhizosphere soil amino sugar N, amino acid N, total acid hydrolysable N contents, L-glutaminase activity and N mineralization rate. The principal component analysis results indicated that rhizosphere soil organic carbon, amino sugar N, amino acid N and total acid hydrolysable N contents, soil β-glucosaminidase, β-glucosidase and L-glutaminase activities were the main factors affecting rhizosphere soil aerobic and anaerobic N mineralization rates. As a result, rhizosphere soil acid hydrolysable N and its fractions, N mineralization, and its extracellular enzyme activities were significantly increased under the combined application of conventional tillage and rotary tillage with the crop residue incorporation condition.

更新日期：2021-08-28

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