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[1]PEI Yile,LI Taixing,WANG Keqin,et al.Effects of Returned Straw Composted Under Different Stockpile Methods on Nitrogen Balance of Flue-Cured Tobacco Farmland Ecosystem in Central Yunnan Province[J].Research of Soil and Water Conservation,2021,28(03):65-73.

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Effects of Returned Straw Composted Under Different Stockpile Methods on Nitrogen Balance of Flue-Cured Tobacco Farmland Ecosystem in Central Yunnan Province

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 03 Page number: 65-73 Column: Public date: 2021-04-20

Title:: Effects of Returned Straw Composted Under Different Stockpile Methods on Nitrogen Balance of Flue-Cured Tobacco Farmland Ecosystem in Central Yunnan Province

Author(s):: PEI Yile¹, LI Taixing², WANG Keqin¹, SONG Yali, DAI Li¹, WEN Changtao³, YANG Jinze¹; (1.College of Ecology and Environment, Southwest Forestry University, Kunming 650224, China;2.Soil and Water Conservation Workstation, Yuxi, Yunnan 653100, China;3.Soil and Water Conservation Workstation, Hongta District, Yuxi, Yunnan 653100, China)

Keywords:: straw returning; stockpile methods; nitrogen balance; farmland ecosystem; flue-cured tobacco

CLC:: S157

DOI:: -

Abstract:: In this study, the farmland ecosystem of flue-cured tobacco in the Erlongtan small watershed in central Yunnan Province was used as the research object. The control(CK)and eight treatments(straw returning of corn)under different stockpile methods were set up. Different treatments included two kinds of straw returning amount(0.75 or 1.5kg/m²), two kinds of straw particle size(1 or 5 cm)and two kinds of stockpile methods(water or mix water with urea). The effects of returned straw composted under different stockpile methods on nitrogen loss from runoff and sediment, soil nitrogen residues, nitrogen absorption in flue-cured tobacco, and nitrogen balance in flue-cured tobacco farmland were studied. The results show that:(1)TN loss from runoff and sediment increased with amount of rainfall and rainfall intensity, respectively;(2)application of 5cm thick straw(compared with 1 cm thin straw), and 1.5kg/m² returning amount(compared with 0.75 kg/m²)could effectively reduce the nitrogen loss from runoff by 0.32%～35.05% and 54.52%～77.23%, respectively;(3)straw returning significantly increased the contents of soil total nitrogen and nitrate nitrogen, and the contents of total nitrogen and nitrate nitrogen were 2.60%～20.33% and 0.35%～90.57% higher than CK, respectively;(4)the distribution characteristics of total nitrogen content in each organ of flue-cured tobacco were showed as the sequence: leaves>stems> roots, the total nitrogen content in the leaves, stems and roots increased by 67.69%, 25.33% and 42.27%, respectively, compared with CK; compared with water stockpile, mix water and urea significantly increased the nitrogen content of flue-cured tobacco by 6.60%～38.03%;(5)in the nitrogen balance, the nitrogen loss from runoff and sediment accounted for 14.36%～24.33% and 2.32%～14.32% of nitrogen input, respectively; the nitrogen loss was mainly caused by runoff nitrogen loss, followed by sediment loss; soil residues of nitrogen accounted for 4.97%～36.79% of nitrogen input; the absorption nitrogen amount of flue-cured tobacco accounted for 41.10%～71.64%, and the nitrogen absorbed by flue-cured tobacco accounted for the main part of nitrogen input. By using the reasonable configuration of mix water and urea, straw returning amount 1.5kg/m and straw particle size of 5cm can effectively maintain nitrogen balance in flue-cured tobacco farmland ecosystem, increase flue-cured tobacco yield, reduce nitrogen loss, and improve the economic and ecological benefits of the farmland ecosystem in this basin.

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Last Update: 2021-04-20