Effects of Different Amounts of Drip Irrigation under Mulch Film on Soil Respiration and Organic Carbon in Soybean Field

doi:10.6048/j.issn.1001-4330.2021.03.008

Abstract

Abstract: 【Objective】 To study the effects of different amounts of drip irrigation under mulch film on soil organic carbon of summer soybean in the hope of providing theoretical basis for high-yield and accumulation of soil organic carbon of summer soybean.【Methods】 In this study, six amounts of drip irrigation under mulch film: 4,200 m³/hm² (W₀), 3,780 m³/hm²(W₁), 3,360 m³/hm²(W₂), 2,940 m³/hm² (W₃), 2,520 m³/hm²(W₄), 2,100 m³/hm² (W₅), and one no mulch treatment 4,200 m³/hm² (CK) were conducted in 2019.respectively to research the impacts of amounts of drip irrigation under mulch film on the contents of soil CO₂ respiration, soil total organic carbon (SOC)and soil carbon pool management index (CPMI) of summer soybean.【Results】 The results showed that contents of soil CO₂ respiration of summer soybean in the measurement period followed the sequence of W₂>W₃>W₄>W₅>W₁>W₀, with no significant difference between W₂ and W₃ treatment (P<0.05).With the increasing irrigation volume, the variation of soil organic carbon content, soil active organic carbon content and soil carbon pool management index all increased first and then decreased, the indicators of W₂ or W₃ treatments were better than those of other treatments.The yields was the highest in W₃ treatment, which was 3,304.90 kg/hm², increased by 7.45%, 5.16%, 0.77%, 8.42% and 18.68% in comparing with that of W₀, W₁, W₂, W₄ and W₅.Besides, the plastic mulching treatments of each physiological indicators were higher than those of no mulching treatment (CK).【Conclusion】 Therefore, 2,940-3,360 m³/hm² can increase the content of soil SOC and AOC in the tillage layer (0-30 cm) for high yield of summer soybean.

Key words: summer soybean; amount of drip irrigation under mulch film; soil CO₂ respiration; organic carbon; soil carbon pool management index

摘要： 【目的】 研究膜下减量滴灌对土壤有机碳的影响,评价出复播大豆高产稳产又能促进土壤有机碳积累的最佳膜下滴灌量。【方法】 于2019年,田间设置4 200 (W₀)、3 780 (W₁)、3 360 (W₂)、2 940 (W₃)、2 520 (W₄)、2 100 (W₅) m³/hm² 6个膜下滴灌量和未覆膜滴灌量4 200 m³/hm²处理 (CK),研究膜下不同滴灌量对复播大豆土壤CO₂呼吸、土壤有机碳及碳库管理指数的影响。【结果】 覆膜条件下,不同测定时期各处理土壤中CO₂排放速率基本表现为W₂>W₃>W₄>W₅>W₁>W₀,且W₂和W₃处理之间均无差异;土层0~ 30 cm的SOC、AOC、CPMI含量均随着滴灌量的增加呈现“先增后降”的趋势,均以W₂或W₃处理达到最大,其大豆产量以W₃处理最高,为3 304.90 kg/hm²,较W₀、W₁、W₂、W₄、W₅处理分别提高了7.45%、5.16%、0.77%、8.42%和18.68%。同等滴灌量条件下,覆膜W₀处理的各指标均高于未覆膜CK处理。【结论】 复播大豆采取地膜覆盖且滴灌量为2 940~3 360 m³/hm²时可增加耕作层(0~30 cm)土壤SOC和AOC的含量,提高产量。

关键词: 复播大豆, 膜下滴灌量, 土壤CO₂呼吸, 有机碳, 土壤碳库管理指数

CLC Number:

S565.1

DU Xiaojing, AN Chongxiao, XU Wenxiu, TANG Jianghua, FANG Yanfei, ZHANG Na, LI Ling. Effects of Different Amounts of Drip Irrigation under Mulch Film on Soil Respiration and Organic Carbon in Soybean Field[J]. Xinjiang Agricultural Sciences, 2021, 58(3): 457-466.

杜孝敬, 安崇霄, 徐文修, 唐江华, 房彦飞, 张娜, 李玲. 膜下不同滴灌量对复播大豆农田土壤呼吸及有机碳的影响[J]. 新疆农业科学, 2021, 58(3): 457-466.

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