膜下滴灌连作棉田土壤有机碳及其活性变化分析

doi:10.6048/j.issn.1001-4330.2021.09.005

摘要/Abstract

摘要： 【目的】研究不同连作年限膜下滴灌棉田土壤有机碳变化特征,为连作棉田有机碳储量估算、固碳潜力分析提供支撑。【方法】采用田间调查、取样测定方法,分析不同连作年限下(L₅、L₁₂、L₁₇、CK)0~40 cm土层土壤有机碳含量、易氧化有机碳、有机碳密度、土壤容重及碳库活度和碳库管理指数变化。【结果】随连作年限的延长,棉田土壤有机碳含量在时间尺度上表现为先增后降,连作1~5a时土壤总有机碳增加,连作5~17 a时总有机碳显著下降;在空间尺度上,有机碳含量表层0~20 cm大于20~40 cm土层含量;不同连作棉田土壤易氧化有机碳和土壤有机碳密度也表现出与总有机碳相同的变化趋势。随种植年限增加各土层土壤容重变化趋势总体为逐渐增大,L₁₇＞L₁₂＞L₅＞CK在空间尺度上,土壤容重随土层深度增加逐渐增大。在时间和空间尺度上,土壤碳库活度均表现为逐渐减小。【结论】长期膜下滴灌,短期连作可以提高土壤总有机碳、易氧化有机碳含量,随着连作年限延长,土壤有机碳和活性有机碳含量均显著下降,土壤碳库管理指数下降,土壤质量降低,土壤肥力受影响。

关键词: 棉田; 连作; 有机碳; 碳库活度

Abstract: 【Objective】 To elucidate the variation characteristics of soil organic carbon in cotton fields under drip irrigation in different continuous cropping years in the hope of provilding data and theoretical support for estimation of organic carbon reserves and analysis of carbon sequestration potential in continuous cropping cotton fields.【Methods】 Field investigation and sampling were used to analyze the changes of soil organic carbon content, oxidizable organic carbon, organic carbon density, soil bulk density, carbon pool activity and carbon pool management index in 0-40 cm soil layer in different consecutive cropping years (L₅, L₁₂, L₁₇ and CK).【Results】 With the increase of continuous cropping years, the soil organic carbon content in cotton fields showed a trend of increasing and then decreasing on the time scale. The total organic carbon content in cotton fields increased when continuous cropping was 1-5 a, and decreased significantly when continuous cropping was 5-17 a. On the spatial scale, the surface layer of organic carbon content was the largest, which decreased layer by layer with the increase of soil layer thickness. The total organic carbon content of 0-20 cm soil layer was greater than 20-40 cm soil layer. The soil organic carbon and soil organic carbon density of different continuous cropping cotton fields also showed the same trend as the total organic carbon. With the increase of planting years, the overall trend of soil bulk density changes in each soil layer was gradually increasing: L₁₇ > L₁₂ > L₅ > CK. In spatial scale, soil bulk density increased gradually with the increase of soil depth. In time and space scale, soil carbon pool activity decreased gradually.【Conclusion】 In the context of long-term drip irrigation under the membrane, short-term continuous cropping could improve the soil total organic carbon and oxidizable organic carbon content. With the extension of continuous cropping years, soil organic carbon and active organic carbon content significantly decreased, soil carbon bank management index decreased, soil quality decreased, and soil fertility was affected.

Key words: cotton field; continuous cropping; organic carbon; carbon library activity

中图分类号:

S153

高文翠, 杨卫君, 史春玲, 陈磊. 膜下滴灌连作棉田土壤有机碳及其活性变化分析[J]. 新疆农业科学, 2021, 58(9): 1603-1609.

GAO Wencui, YANG Weijun, SHI Chunling, CHEN Lei. Study on Soil Organic Carbon and Its Change of Activity in Continuous Cropping Cotton Field under Mulched Drip Irrigation[J]. Xinjiang Agricultural Sciences, 2021, 58(9): 1603-1609.

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