13C富集玉米根、茎、叶添加对长期不施肥和施肥处理棕壤土壤呼吸的影响及其激发效应
作者:
作者单位:

沈阳农业大学

作者简介:

通讯作者:

中图分类号:

基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目)


Effects of Root, Stem and Leaf of Maize Enriched by 13C on Brown Earth
Author:
Affiliation:

Shenyang agricultural university

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    玉米根、茎、叶残体因含碳化学组分差异,还田后对不同肥力土壤呼吸及激发效应的影响存在差异性,为探究这种影响的田间差异性,采用13C标记玉米秸秆示踪方法,在沈阳农业大学棕壤长期定位试验站进行540天田间培养试验,共设置8个处理:低肥土壤(LF+CK)、低肥土壤+根(LF+R)、低肥土壤+茎(LF+S)、低肥土壤+叶(LF+L)、高肥土壤(HF+CK)、高肥土壤+根(HF+R)、高肥土壤+茎(HF+S)、高肥土壤+叶(HF+L)。结果显示:(1)培养期内,土壤呼吸通量、秸秆碳对土壤CO2-C排放的贡献率均呈下降趋势;(2)与不添加秸秆土壤相比,低肥土壤添加根、茎、叶处理的土壤CO2-C排放累积量分别增加134%、126%和95%,高肥土壤分别增加157%、189%和96%;(3)根、茎在高肥土壤中对土壤CO2-C排放的贡献显著大于叶,在低肥土壤中并无差异;(4)秸秆不同部位还田均会引起高低肥土壤的正激发效应,其中添加根、茎的激发效应显著强于叶,而秸秆不同部位对两种肥力水平土壤的激发效应均无显著影响。综上,秸秆不同部位还田对土壤呼吸的CO2累积排放量影响显著;玉米叶较玉米根、茎容易分解,但由于土壤自身养分差异,玉米叶还田初期在低肥土壤分解速率高于根、茎,而在高肥土壤小于根、茎。因此细化秸秆还田对农田土壤呼吸有重要意义,未来在秸秆还田研究中应考虑秸秆不同部位和土壤肥力间的交互影响。

    Abstract:

    Due to the differences in carbon chemical components among maize residues (root, stem and leaf), their return to cropland soils with different fertility levels will induce differences in soil respiration and priming.【Method】In order to explore these differences in the field, a 540-day in-situ field experiment with eight treatments of low fertilizer soil (LF+CK), low fertilizer soil + root (LF + R), low fertilizer soil + stem (LF + S), low fertilizer soil + leaf (LF + L), high fertilizer soil (HF+CK), high fertilizer soil + root (HF + R), high fertilizer soil + stem (HF + S) and high fertilizer soil + leaf (HF + L), was carried out at a long-term positioning station of brown earth in Shenyang Agricultural University using 13C labeled maize straw tracing method.【Result】Results showed that (1) the contribution rates of soil respiration flux and straw carbon to soil CO2-C emission showed downward trends over the in-situ incubation period. (2) Compared to the treatment without straw, the cumulative CO2-C released from low fertility soil with root, stem and leaf increased by 134%, 126% and 95%, respectively, while that from high fertility soil increased by 157%, 189% and 96%, respectively. (3) The contributions of root and stem to soil CO2-C emission in high fertility soil were significantly greater than that of leaf, but there was no difference in low fertility soil. (4) Different parts of maize straw returning to the field could cause the positive priming effects in both high and low fertility soils. Meanwhile, the priming effects of adding root and stem were significantly stronger than that of adding leaf, showing root and stem would cause more positive priming effects of soil CO2-C than the leaf. Moreover, there was no significant effect on the priming effect between straw parts and soil fertility.【Conclusion】Overall, this study enriched the theory of cropland soil respiration induced by straw returning, suggesting that the interaction of straw parts and soil fertility on soil respiration should be considered in straw returning.

    参考文献
    相似文献
    引证文献
引用本文

于雅茜,裴久渤,刘维,王萌萌,尹思佳.13C富集玉米根、茎、叶添加对长期不施肥和施肥处理棕壤土壤呼吸的影响及其激发效应[J].土壤学报,DOI:10.11766/trxb202110300587,[待发表]
Yu yaxi, PEI Jiu-bo, LIU Wei, WANG Meng-meng, YIN Si-jia. Effects of Root, Stem and Leaf of Maize Enriched by 13C on Brown Earth[J]. Acta Pedologica Sinica, DOI:10.11766/trxb202110300587,[In Press]

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2021-10-30
  • 最后修改日期:2022-07-16
  • 录用日期:2022-09-05
  • 在线发布日期: 2022-09-19
  • 出版日期: