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[1]GAO Zechao,PAN Yanfei,XU Qinxue,et al.Effect of Straw Mulch on Runoff and Sediment Production in Young Citrus Orchards in Southwest Karst[J].Research of Soil and Water Conservation,2022,29(01):36-43.

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Effect of Straw Mulch on Runoff and Sediment Production in Young Citrus Orchards in Southwest Karst

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 01 Page number: 36-43 Column: Public date: 2022-02-20

Title:: Effect of Straw Mulch on Runoff and Sediment Production in Young Citrus Orchards in Southwest Karst

Author(s):: GAO Zechao^1,2, PAN Yanfei^1,2, XU Qinxue^2,3, ZHANG Shuaipu^1,2, FU Zhiyong³, CHEN Hongsong³; (1.Key Laboratory for Theory and Technology of Environmental Pollution Control in Guangxi, Science and Technology Innovation Base, Guilin University of Technology, Guilin, Guangxi 541004, China; 2.Guangxi Collaborative Innovation Center for Water Pollution Control and Safety in Karst Area, Guilin University of Technology, Guilin, Guangxi 541004, China; 3.Huanjiang Karst Ecosystem Observation and Research Station, Chinese Academy of Sciences, Huanjiang, Guangxi 547100, China)

Keywords:: runoff and sediment production; citrus orchards; simulated rainfall; karst; straw mulch

CLC:: S157.4

DOI:: -

Abstract:: The young sloping citrus orchard in karst area is prone to soil erosion because of the severe factitious disturbance. Straw mulch is a common measure to conserve water and soil on sloping land, but the efficiency of straw mulch in the soil and water conservation of citrus orchards on sloping land in karst area is not clear. The present study used simulated rainfall experiment to study the effects of straw mulch on runoff and sediment production in young citrus orchards in sloping fields of karst area. Two rainfall intensities(60 mm/h and 120 mm/h)and four levels of straw cover rates(0, 20%, 50%, and 80%)were set up. The results show that:(1)the effect of Straw mulch on reducing surface runoff coefficient is controlled by rainfall intensity; under the condition of medium rainfall intensity(60 mm/h), straw mulch can effectively reduce the coefficient of surface runoff; under the condition of high rainfall intensity(120 mm/h), only 20% coverage can reduce the runoff coefficient;(2)under moderate rainfall intensity(60 mm/h), 20% and 50% straw mulch can significantly increase interflow and underground runoff, and under heavy rainfall intensity(120 mm/h), 20% straw mulch significantly increases interflow, the effects of 50% and 80% straw coverage on interflow are not significant;(3)straw mulch can effectively reduce the total amount of soil erosion; the total soil erosion and straw mulch are negatively correlated;(4)straw mulch reduces the sediment carrying capacity of surface runoff, and the sediment carrying capacity of surface runoff decreases significantly at 50% and 80% straw mulching levels. This study can provide the scientific basis for the rational arrangement of water and soil conservation measures in young citrus orchards in sloping land of karst area.

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Last Update: 2022-02-20