| 引用本文: | 杨 乐,曹 辉,付媛媛,等.灌水量与灌水方式对夏玉米土壤CO2排放和产量的影响[J].灌溉排水学报,2023,42(11):31-39. |
| YANG Le,CAO Hui,FU Yuanyuan,et al.灌水量与灌水方式对夏玉米土壤CO2排放和产量的影响[J].灌溉排水学报,2023,42(11):31-39. |
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| 摘要: |
| 【目的】探寻灌水量和灌水方式对夏玉米农田土壤CO2排放及产量的影响，提出节水稳产减排的灌溉管理措施。【方法】设置常规滴灌（DI）和交替滴灌（ADI）2种灌水方式，灌水量设置为36 mm和27 mm，共4个处理，分别记为36DI、27DI、36ADI、27ADI。采用Li-8100A测定土壤CO2排放通量，研究灌水量和灌水方式对玉米农田土壤CO2排放通量、累积排放量、土壤酶活性和玉米产量的影响，分析土壤CO2排放与土壤充水孔隙度（WFPS）和土壤温度的关系。【结果】与DI处理相比，ADI处理土壤CO2累积排放量显著降低12%~17%。36 mm灌水量较27 mm增加了CO2累积排放量，但增加幅度受灌水方式影响。土壤CO2排放通量与0~10 cm的WFPS、土壤温度及其交互作用间存在显著相关关系。灌水量与灌水方式通过影响WFPS、土壤温度来改变土壤酶活性，是其影响土壤CO2排放的调控机制之一。灌水量、灌水方式及其交互作用显著影响玉米产量。27ADI处理的产量较36DI处理降低8.7%，但CO2累积排放量减少19%。【结论】27ADI处理在保证玉米产量同时减少了玉米生育期内的土壤CO2累积排放量，是一种节水稳产减排的灌水模式。 |
| 关键词: 夏玉米；交替滴灌；CO2排放；土壤酶活性；产量 |
| DOI：10.13522/j.cnki.ggps.2023027 |
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| The Effects of Irrigation Amount and Method on Soil CO2 Emission and Yield of Summer Maize |
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YANG Le, CAO Hui, FU Yuanyuan, GAO Yang, LIU Zhandong
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1. Institute of Filed Irrigation, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China;
2. Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100082, China
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| Abstract: |
| 【Objective】Maize is an important staple crop in central and northern China, and during certain seasons, its cultivation needs irrigation. This paper studied]s the intertwined effect of irrigation amount and method on soil CO2 emissions and the yield of summer maize.【Method】The field experiment compared two irrigation methods: conventional drip irrigation (DI) and alternating drip irrigation (ADI). For each irrigation, there were two irrigation amounts: 36 and 27 mm. In each treatment, we measured CO2 emission using the Li-8100A. We also measured soil enzymatic activity, soil water content and temperature, and grain yield, from which we analyzed the dependence of soil CO2 emission on soil water-filled porosity (WFPS) and soil temperature.【Result】Compared to DI, ADI reduced cumulative soil CO2 emission by 12% to 17%. Increasing irrigation amount from 27 mm to 36 mm increased cumulative soil CO2 emissions, despite the increase depending on irrigation method. A notable correlation was found between soil CO2 emission and WFPS and soil temperature in the 0~10 cm soil layer. The impact of soil water and temperature on CO2 emission was intertwined. Irrigation amount and method both affected soil enzyme activity via their effect on WFPS and soil temperature, which serve as a regulatory mechanism impacting soil CO2 emissions. Irrigation amount and method also significantly affected maize yield. Compared with DI with irrigation amount of 36 cm, ADI with irrigation amount of 27 mm reduced the yield by 8.7%, but it reduced the cumulative CO2 emission by 19%. 【Conclusion】ADI with 27 mm of irrigation was most effective to ensure maize yield while reducing soil CO2 emissions. It is a water-saving and emission-reducing irrigation method and can be used as an improved agronomic practice for maize production in the studied region. |
| Key words: maize; alternate drip irrigation; CO2 emissions; soil enzymatic activity; yield |
