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应用生态学报 ›› 2019, Vol. 30 ›› Issue (4): 1218-1226.doi: 10.13287/j.1001-9332.201904.007

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棉花长期连作结合秸秆还田对土壤颗粒有机碳及红外光谱特征的影响

常汉达, 王晶, 张凤华*   

  1. 石河子大学, 新疆生产建设兵团绿洲生态农业重点实验室, 新疆石河子 832003
  • 收稿日期:2018-09-28 出版日期:2019-04-20 发布日期:2019-04-20
  • 通讯作者: * E-mail: zfh2000@126.com
  • 作者简介:常汉达,男,1994年生,硕士研究生. 主要从事农田有机质转化及稳定性研究. E-mail: 961639428@qq.com
  • 基金资助:
    本文由公益性行业(农业)科研专项(201503120)和新疆生产建设兵团科技攻关与成果转化项目(2016AD022)资助

Effects of continuous cropping with straw return on particulate organic carbon and Fourier transform infrared spectroscopy in cotton field

CHANG Han-da, WANG Jing, ZHANG Feng-hua*   

  1. Xinjiang Production and Construction Group Key Laboratory of Oasis Eco-agriculture, Shihezi University, Shihezi 832003, Xinjiang, China
  • Received:2018-09-28 Online:2019-04-20 Published:2019-04-20
  • Contact: * E-mail: zfh2000@126.com
  • Supported by:
    This work was supported by the Public Welfare Industry (Agriculture) Research Project (201503120) and the Xinjiang Production and Construction Group Science and Technology Research and Achievement Transformation Project (2016AD022).

摘要: 以新疆玛纳斯河流域长期连作棉田为研究对象,采用傅里叶红外光谱技术(FTIR)分析不同连作年限[0(对照)、5、10、15和20年]棉田土壤红外光谱特征,分析连作结合秸秆还田对土壤有机碳结构和稳定性的影响.结果表明: 随连作年限增加,土壤有机质中多糖和芳香族基团相对峰强度下降,脂肪族和醇酚相对峰强度上升,脂肪族-CH/芳香族C=C逐年升高.连作5年土壤颗粒有机碳含量最高,比对照土壤高5.11倍,之后随连作年限增加颗粒有机碳含量逐渐降低;连作10年土壤矿物结合态有机碳含量最高,比对照高1.84倍,连作5年土壤颗粒有机碳与矿物结合态有机碳含量之比(ω(POC)/ω(MOC))最高,之后随连作年限增加开始下降.综上,棉田长期连作结合秸秆还田后土壤有机质结构趋于脂肪化,土壤矿物结合对有机质保护性升高,有机质稳定性升高.

Abstract: A long-term field experiment was conducted to investigate the effects of continuous cotton production years (0 as control, 5, 10, 15 and 20 years) and straw return on soil organic carbon (SOC) structure and stability by using Fourier transform infrared spectroscopy (FTIR) in Manas River valley of Xinjiang. The results showed that the relative peak intensity of polysaccharide and aromatics decreased with increasing continuous cropping years, whereas the aliphatic and alcoholic phenols relative peak intensity and the CH/C=C increased. The content of soil particulate organic carbon (POC) increased significantly in the 5-yr of cotton production farmland and then decreased with the increases of continuous cropping years. POC content was 5.11 times higher in 5-yr than that of the control. The content of mineral-bound organic carbon (MOC) was the highest in 10-yr farmland, being 1.84 times higher than that of the control. The highest value of the ratio of POC and MOC content (ω(POC)/ω(MOC)) was observed in 5-yr farmland. Together, long-term continuous cotton production with straw return led to SOC structure aliphatic and soil mineral binding increased the protection of organic matter, thus increasing the stability of soil organic matter.