中国农业科学 ›› 2021, Vol. 54 ›› Issue (21): 4611-4622.doi: 10.3864/j.issn.0578-1752.2021.21.011

• 土壤肥料·节水灌溉·农业生态环境 • 上一篇    下一篇

地膜覆盖麦田土壤有机碳矿化特征及其温度敏感性

曹寒冰1,2(),谢钧宇1,2,刘菲1,高健永1,王楚涵1,王仁杰3,谢英荷1,李廷亮1,*()   

  1. 1山西农业大学资源环境学院/省部共建有机旱作农业国家重点实验室(筹),太原 030031
    2土壤环境与养分资源山西省重点实验室,太原 030031
    3全国蔬菜质量标准中心,山东潍坊 262700
  • 收稿日期:2021-07-26 接受日期:2021-09-16 出版日期:2021-11-01 发布日期:2021-11-09
  • 通讯作者: 李廷亮
  • 作者简介:联系方式:曹寒冰,E-mail: caohanbing119@163.com
  • 基金资助:
    山西农业大学省部共建有机旱作农业国家重点实验室自主研发项目(202105D121008-1-13);黄土高原特色作物优质高效生产省部共建协同创新中心基金项目(SBGJXTZX-25);山西省高等学校科技创新项目(2021L164);国家自然科学基金(41807102);国家自然科学基金(U1710255-3);山西省土壤环境与养分资源重点实验室开放基金项目(2019003);山西省土壤环境与养分资源重点实验室开放基金项目(2020001);山西农业大学科技创新基金(青年科技创新)项目(2019004);山西农业大学科技创新基金(博士科研启动)(2020BQ50);国家重点研发计划(2018YFD0200401);国家公益性行业(农业)科研专项(201503124)

Mineralization Characteristics of Soil Organic Carbon and Its Temperature Sensitivity in Wheat Field Under Film Mulching

CAO HanBing1,2(),XIE JunYu1,2,LIU Fei1,GAO JianYong1,WANG ChuHan1,WANG RenJie3,XIE YingHe1,LI TingLiang1,*()   

  1. 1College of Resources and Environment, Shanxi Agricultural University/State Key Laboratory of Sustainable Dryland Agriculture (in preparation), Taiyuan 030031
    2Key Laboratory of Soil Environment and Nutrient Resources of Shanxi Province, Taiyuan 030031
    3National Vegetable Quality Standards Center, Weifang 262700, Shandong;
  • Received:2021-07-26 Accepted:2021-09-16 Online:2021-11-01 Published:2021-11-09
  • Contact: TingLiang LI

摘要:

【目的】明确旱地土壤有机碳矿化对地膜长期覆盖的响应及有机碳矿化的温度敏感性,进而深入理解土壤有机碳的转化与稳定机制,为旱地土壤培肥和作物增产提供理论支撑。【方法】在黄土高原东南部2012年开始的旱地小麦田间地膜覆盖试验的基础上,采集不同覆盖栽培模式(常规施肥(不覆膜)、测控施肥(不覆膜)、垄膜沟播(覆膜)、平膜穴播(覆膜))试验的0—20 cm土层土壤样品,采用不同温度(15、25和35℃)进行室内有机碳矿化培养实验。在培养后的第1、3、5、7、14、21、28、35和42天运用碱液吸收法测定土壤有机碳矿化速率,结合双库指数模型拟合土壤活性和惰性有机碳库的容量及其分解速率,研究地膜覆盖对土壤有机碳矿化特征的影响及有机碳矿化对温度变化的响应规律。【结果】温度升高显著提高了土壤有机碳矿化速率、累积矿化量和惰性有机碳库(Cs)的矿化量,但是显著降低了温度敏感性系数(Q10)和活化能(Ea)。25℃和35℃时土壤有机碳矿化速率和累积矿化量均无显著差异,分别为15℃时的2倍,Cs的矿化量分别较15℃时提高了93.4%和105.3%。但是Q10(25-35℃)比Q10(15-25℃)降低了19.3%,Ea(25-35℃)比Ea(15-25℃)同步降低了68.0%。地膜覆盖显著提高了土壤有机碳累积矿化量、Q10、Ea以及Cs的矿化量。同常规施肥相比,垄膜沟播和平膜穴播均显著提高了土壤有机碳累积矿化量,增幅分别为26.5%—38.6%(25℃)和27.8%—64.4%(35℃),且以平膜穴播提升幅度最大;平膜穴播处理亦显著提高了Q10和Ea,其中Q10增幅分别为28.5%(15—25℃)和25.8%(25—35℃),Ea增幅分别为93.4%和193.1%;平膜穴播处理还显著提高了Cs的矿化量,增幅达115.8%—2 208.2%。【结论】黄土高原旱地麦田土壤上地膜覆盖加速了土壤有机碳矿化,尤其是平膜穴播,主要通过增加惰性有机碳库的矿化,进而显著提高了土壤有机碳累积矿化量及其温度敏感性。

关键词: 旱地, 土壤有机碳矿化, 温度敏感性, 惰性有机碳库, 平膜穴播

Abstract:

【Objective】Clarify the response of dryland soil organic carbon (SOC) mineralization to long-term film mulching and its temperature sensitivity, and further understand the transformation and stabilization mechanism of SOC, providing theoretical support for dryland soil fertility and crop productivity. 【Method】Based on the dryland wheat field mulching experiment that began in 2012 in the southeastern of the Loess Plateau, soil samples of 0-20 cm layer for different mulching cultivation modes (farmer’s practice fertilization (no film mulching), monitoring fertilization (no film mulching), monitoring fertilization plus ridge mulching-furrow planting (mulching), and monitoring fertilization plus whole field film (mulching)) were collected, and then the soil samples were incubated at different temperatures (15, 25 and 35℃). The lye absorption method was used to determine the SOC mineralization rate at the 1st, 3rd, 5th, 7th, 14th, 21st, 28th, 35th and 42th days after incubation, combined with two component model to fit the cumulative mineralization and decomposition rate of soil active and recalcitrant organic carbon pool, investigate the effect of film mulching on SOC mineralization characteristics and the response of SOC mineralization to temperature.【Result】The results showed that the increasing temperature had significantly increased SOC mineralization rate, cumulative mineralization and the mineralization amount of recalcitrant organic carbon pool (Cs), but markedly decreased the temperature sensitivity (Q10) and activation energy (Ea). The mineralization rate and cumulative mineralization of SOC at 25℃ and 35℃ were about twice that at 15℃, and the mineralization of Cs increased by 93.4% and 105.3% respectively compared with that at 15℃. But Q10 (25-35℃) is 19.3% lower than Q10 (15-25℃), and Ea (25-35℃) is 68.0% lower than Ea (15-25℃). Plastic film mulching significantly increased the SOC cumulative mineralization, the mineralization of Q10, Ea and Cs. Compared with farmer fertilization treatment, both monitoring fertilization plus ridge mulching-furrow planting and monitoring fertilization plus whole field film treatments had significantly increased the SOC cumulative mineralization by 26.5%-38.6% (25℃) and 27.8%-64.4% (35℃), respectively, while monitoring fertilization plus whole field film treatment had the largest improvement. The monitoring fertilization plus whole field film treatment had also significantly increased Q10 by 28.5% (15-25℃) and 25.8% (25-35℃) and Ea by 93.4% and 193.1%, respectively. Furthermore, monitoring fertilization plus whole field film treatment had markedly increased the mineralization amount of Cs by 115.8%-2 208.2%. 【Conclusion】Therefore, film mulching accelerated the SOC mineralization in the dryland wheat field of the Loess Plateau, especially for monitoring fertilization plus whole filed filming treatment mainly increased the mineralization of recalcitrant organic carbon pool, and then significantly increased the cumulative mineralization of SOC and its temperature sensitivity.

Key words: dryland, soil organic carbon mineralization, temperature sensitivity, recalcitrant organic carbon pool, monitoring fertilization plus whole filed filming