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[1]RAN Jiaojiao,HUANG Ping,CHEN Chenglong,et al.Conversion of Rice Paddy into Dry Land and Its Influence on Nitrogen Fluxes in the Low Hilly Area[J].Research of Soil and Water Conservation,2022,29(02):70-75.

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Conversion of Rice Paddy into Dry Land and Its Influence on Nitrogen Fluxes in the Low Hilly Area

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 02 Page number: 70-75 Column: Public date: 2022-03-20

Title:: Conversion of Rice Paddy into Dry Land and Its Influence on Nitrogen Fluxes in the Low Hilly Area

Author(s):: RAN Jiaojiao¹², HUANG Ping², CHEN Chenglong³, CI En⁴, LV Mingquan²; (1.Chongqing Jiaotong University, Chongqing 400074, China; 2.Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China; 3.Changjiang Normal University, Chongqing 408100, China; 4.College of Resources and Environment, Southwest University, Chongqing 400715, China)

Keywords:: non-point source pollution; nitrogen loss; export coefficient model; small watershed of Three Gorges reservoir area; land use

CLC:: X524

DOI:: -

Abstract:: To explore the effect of the land conversion of rice paddy into dry land on regional nitrogen loss, the land use change from 2001 to 2019 was identified by using the transfer matrix of land use in the Quxi Basin of the Three Gorges reservoir area. The nitrogen loads of the basin from 2001 to 2019 were calculated and compared by the export coefficient model with the parameters modified by the measured nitrogen load data of the basin. The results showed that from 2001 to 2019 the overall shifting trend of land use in the basin was the conversion of rice paddy into dry land and dry land into woodland, and the conversion of rice paddy into dry land was the main trend. This land conversion resulted in 26% increase in nitrogen loss in 2019 compared with that in 2001, with an average increase of about 7.8 kg/hm². The results indicate that, in facing the rapid agricultural land-use change, the significant role of paddy field in purifying and intercepting non-point source nitrogen should be taken into account, paddy field area of given size shall be maintained, and paddy field shall be designed at some key nodes of nitrogen transport in the small watershed agricultural landscape. These results can provide a new insight of a regional control of non-point source pollution in coping with the environmental changes.

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Last Update: 2022-04-20