基于Meta-analysis研究不同管理措施对中国农田土壤剖面有机碳的影响
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S152.4;S156.6

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国家重点研发计划项目(2017YFC0503906)、国家自然科学基金项目(41771253)和中国科学院科技服务网络计划(STS)项目(KFJ-STS-ZDTP-057)资助。


Effects of Different Management Measures on the Organic Carbon of Farmland Soil Profile in China Based on Meta-analysis
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    摘要:

    本研究收集了1980—2019年间国内外已发表有关中国农田管理措施对剖面有机碳(SOC)影响的文献,利用Meta-analysis整合分析不同农田管理措施对我国农田土壤剖面SOC变化的影响。结果表明,不同耕作条件下,免耕覆盖(NTS)对土壤剖面SOC的提升速率显著大于传统耕作(CT),年变化率达36.1%,深层土壤(>20 cm) SOC也明显增加约7%~31%,增加了深层土壤碳的输入量;与不施肥相比,不同施肥措施均能显著提高剖面SOC含量,其中MNPK处理(化肥与有机肥配施)对耕层(0~20 cm) SOC增长速率最大,约为0.52 g/(kg·a);常年水田耕作形成的淹水厌氧环境,可有效减缓有机物质的矿化分解、增加表层(0~20 cm) SOC累积,年增长率达24.84%;随耕作年限增加,表层土壤碳随耕作输入深层土壤,深层(>20 cm) SOC固定量增加约2.17%~20.29%。不同农田管理措施比较分析结果显示,MNPK、NTS和水田耕作处理通过保护土壤结构稳定、维持土壤环境不被破坏、增加土壤碳输入等手段,均可达到抑制SOC矿化分解和提升土壤固碳量的效果,其中,NTS对剖面SOC的年提升率达11%~36%,在管理措施中表现最佳,可广泛推广。

    Abstract:

    In this study, 313 literatures were collected at home and abroad from 1980 to 2019 on the effect of farmland management measures on soil profile SOC in China. The meta-analysis method was used to study the influence of the farmland management measures on soil profile SOC. The results showed that the increasing rate of surface SOC content was significantly higher under NTS (no tillage + straw) than that under CT (conventional tillage) among different tillage conditions, with an annual change rate of 36.1%. NTS also showed a significant increasing rate of SOC concentration (about 7%-31%) in deeper soil (<20 cm), and then improved the input of carbon. Compared with the no fertilization treatment, the fertilization measures could significantly increase SOC content in the whole profile. And, the MNPK treatment (combined application of chemical fertilizer and organic fertilizer) had the highest increasing rate of SOC in the surface layer (0-20 cm), which was about 0.52 g/(kg·a). The flooded anaerobic environment formed by perennial paddy field could effectively slow down the mineralization and decomposition of organic materials and significantly increase the SOC accumulation in the surface layer (0-10 cm), with an annual growth rate of 24.84%. The topsoil carbon was leached to deeper soil (<20 cm) during different tillage, the amount of SOC sequestration had an increasing trend (about 2.17%-20.29%) with the increase of tillage years. The comparative analysis results of different farmland management measures showed that the MNPK, NTS and the paddy cultivation treatment could inhibit SOC mineralization and enhance its sequestration by protecting soil structure and maintaining the soil environmental stability. Among agricultural management measures, NTS had the best effect of soil carbon sequestration, and the annual variation rate of soil profile SOC was 11%-36%, and it should be widely popularized.

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董丽,史学正,徐胜祥,王美艳.基于Meta-analysis研究不同管理措施对中国农田土壤剖面有机碳的影响[J].土壤,2021,53(6):1290-1298. DONG Li, SHI Xuezheng, XU Shengxiang, WANG Meiyan. Effects of Different Management Measures on the Organic Carbon of Farmland Soil Profile in China Based on Meta-analysis[J]. Soils,2021,53(6):1290-1298

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  • 收稿日期:2020-08-18
  • 最后修改日期:2021-03-10
  • 录用日期:2021-03-26
  • 在线发布日期: 2021-12-09
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