花岗岩侵蚀劣地不同种植年限果园土壤团聚体的稳定性

林哲; 黄智刚; 邓羽松; 黄婉霞; 蒋代华; 王玲

doi:10.13961/j.cnki.stbctb.2021.04.010

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花岗岩侵蚀劣地不同种植年限果园土壤团聚体的稳定性

试验研究

- 花岗岩侵蚀劣地不同种植年限果园土壤团聚体的稳定性
- Stability of Soil Aggregate in Orchards with Different Planting Years in Granite Eroded Poor Area
- 水土保持通报 2021年41卷第4期页码：69-76
- 作者机构：
  
  1. 广西大学农学院,广西,南宁,530004
  2. 中国农业科学院农业环境与可持续发展研究所,北京,100081
  3. 广西大学林学院,南宁,530004
  4. 华中农业大学资源与环境学院,湖北,武汉,430070
- 作者简介：
- 基金信息：
  
  国家重点研发计划项目“侵蚀退化红壤肥力提升与生态功能定向调控技术”（2017YFC0505402）;广西科技重大专项“集约化农区面源污染综合防控体系与示范”（桂科AA17204078-4）;国家自然科学基金重点项目（41630858）
- DOI：10.13961/j.cnki.stbctb.2021.04.010
  中图分类号： S157
- 纸质出版：2021
- 稿件说明：
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林哲, 黄智刚, 邓羽松, 等. 花岗岩侵蚀劣地不同种植年限果园土壤团聚体的稳定性[J]. 水土保持通报, 2021,41(4):69-76.

Lin Zhe, Huang Zhigang, Deng Yusong, et al. Stability of Soil Aggregate in Orchards with Different Planting Years in Granite Eroded Poor Area[J]. Bulletin of Soiland Water Conservation, 2021, 41(4): 69-76.
林哲, 黄智刚, 邓羽松, 等. 花岗岩侵蚀劣地不同种植年限果园土壤团聚体的稳定性[J]. 水土保持通报, 2021,41(4):69-76. DOI： 10.13961/j.cnki.stbctb.2021.04.010.

Lin Zhe, Huang Zhigang, Deng Yusong, et al. Stability of Soil Aggregate in Orchards with Different Planting Years in Granite Eroded Poor Area[J]. Bulletin of Soiland Water Conservation, 2021, 41(4): 69-76. DOI： 10.13961/j.cnki.stbctb.2021.04.010.

摘要

[目的] 对花岗岩侵蚀劣地不同种植年限果园土壤团聚体稳定性进行研究，为南方花岗岩丘陵区侵蚀劣地的综合治理工作提供科学参考。[方法] 以桂东南花岗岩丘陵区柑橘园土壤为研究对象，运用Le Bissonnais （LB）法测定了侵蚀区不同种植年限（0，3，7，12，16，21 a）果园土壤团聚体组成及其稳定性，探究团聚体稳定性随种植年限的变化趋势及其影响因素。[结果] ①随着种植年限的延长，土壤通透性改善，阳离子交换量、有机碳含量提高，细颗粒物质含量上升，土壤质地由砂质土逐步向壤质土转化。②在LB法3种处理下，>0.25 mm粒径的团聚体质量百分数均随着种植年限的增加而增加，到21 a时均达到了65.68%以上，较对照（0 a）增加9.18%，土壤团聚度升高。③土壤团聚体平均重量直径（MWD）随着种植年限延长显著提高，且相对消散指数（RSI），机械破碎指数（RMI）及可蚀性因子K值均有不同程度的下降，表明团聚体稳定性得到提高。④团聚体MWD与土壤有机碳含量、黏粒含量为极显著正相关关系，与阳离子交换显著正相关，与砂粒含量极显著负相关，表明土壤中有机碳、黏粒以及阳离子交换量的提高均可以显著提高团聚体稳定性；有机碳含量是影响团聚体稳定性的主要影响因素。[结论] 削坡开梯开垦柑橘园可以有效治理侵蚀劣地，且随着开垦年限的增加，土壤的结构趋于稳定，团聚体稳定性提高，土壤质量改善。

Abstract

[Objective] The stability of soil aggregate in orchard with different planting years in granite eroded poor land was studied to provide scientific reference for comprehensive management of eroded poor land in granite hilly area of South China. [Methods] The composition and stability of soil aggregate in orchards with different planting years (0

21 years) in eroded area were determined by using Le bissonnais (LB) method in granite hilly area of Southeast Guangxi Zhuang Autonomous Region

and to explore the variation trend of soil aggregate stability with planting years and its influencing factors. [Results] ① With the increase of planting years

soil permeability was improved

cation exchange content

organic carbon content and fine particulate matter content increased

and the soil texture gradually transformed from sandy soil to loam soil. ② Under three different LB methods

the soil aggregate mass percentage of >0.25 mm size increased with the prolongation of planting years

reached more than 65.68% at 21 years

which was 9.18% higher than that of control. ③ The mean weight diameter (WMD) of soil aggregate increased significantly with the prolongation of the planting years. And the RSI

RMI

and k values all decreased to different degrees

meaning that the aggregate stability was improved. ④ The MWD was extremely significantly positively related to soil organic carbon content and clay content. Cation exchange content was significantly positively related to MWD

and sand content was extremely significantly negatively correlated. This showed that the increase of organic carbon

clay and cation exchange content could significantly improved the soil aggregate stability. The content of organic carbon was the main factor affecting the stability of aggregates. [Conclusion] Cutting slope to form citrus orchard can effectively control eroded poor land

and with the prolongation of reclamation years

the soil structure tends to be stable

and then the aggregate stability and the soil quality are improved.

关键词

Keywords

references

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