Soil Aggregate Stability of Poplar Farmland Shelter Belts in Black Soil Region

SUN Jiaxing; ZHAO Yusen; XIN Ying; ZHANG Jun

doi:10.13961/j.cnki.stbctb.2018.03.011

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Soil Aggregate Stability of Poplar Farmland Shelter Belts in Black Soil Region

- Soil Aggregate Stability of Poplar Farmland Shelter Belts in Black Soil Region
- Bulletin of Soiland Water Conservation Vol. 38, Issue 3, Pages: 66-73(2018)
- 作者机构：
  
  东北林业大学林学院,黑龙江,哈尔滨,150040
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2018.03.011
  CLC：
- Published：2018
- 稿件说明：
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SUN Jiaxing, ZHAO Yusen, XIN Ying, et al. Soil Aggregate Stability of Poplar Farmland Shelter Belts in Black Soil Region[J]. Bulletin of Soiland Water Conservation, 2018, 38(3): 66-73.
DOI：

SUN Jiaxing, ZHAO Yusen, XIN Ying, et al. Soil Aggregate Stability of Poplar Farmland Shelter Belts in Black Soil Region[J]. Bulletin of Soiland Water Conservation, 2018, 38(3): 66-73. DOI： 10.13961/j.cnki.stbctb.2018.03.011.

摘要

[目的]探究黑土区不同密度下杨树农田防护林带对林下土壤结构的影响，为合理配置当地农田防护林的栽植密度提供参考。[方法]以黑龙江省拜泉县株行距分别为1.5 m×1 m，2 m×1.5 m，3 m×1.5 m的不同密度杨树农田防护林带为研究对象，弃耕地作为对照，分析不同密度下不同径级团聚体的百分含量、团聚体破坏率（PAD）、平均质量直径（MWD）、几何平均直径（GMD）以及分形维数（D）。[结果]①各样地均表现为表层团聚体破坏率（PAD）最低，林带的存在降低了深层土壤的团聚体破坏率（PAD）。随着林带密度的降低，团聚体破坏率（PAD）整体呈现下降趋势。②平均质量直径（MWD）、几何平均直径（GMD）均随密度的降低而降低，随土层深度的增加而降低，各林带与对照之间差异显著（p<0.01）。③非水稳性团聚体分形维数和水稳性团聚体分形维数在0-20 cm土层随密度的减小而减小，在20-60 cm土层随密度的减小而增大。[结论]林带下土壤结构总体优于弃耕地，林带增加了土壤黏粒含量，增强了深层土壤稳定性。林带密度越大，对土壤的改良作用越明显，但会增大表层土壤的团聚体破坏度。

Abstract

[Objective] To explore the effects of poplar farmland shelter belts on the structure of soil under forest in order to provide guidance for rational allocation of tree planting density in black soil region.[Methods] This study investigated soil aggregate and analyzed the aggregates contents

percentage of aggregate disruption

mean weight diameter

geometric mean diameter and fractal dimension stability based on different space(1.5 m×1 m

2 m×1.5 m

3 m×1.5 m) in Baiquan County

Heilongjiang Province. Abandoned farmland was taken as control treatment.[Results] ① The percentage of aggregate disruption(PAD) of surface soil was the lowest and the percentage of aggregate disruption decreased with the decrease of forest belt density. The percentage of aggregate disruption in forest belt was less than control. ② With the increase of soil depths

mean weight diameter(MWD) and geometric mean diameter(GMD) decreased. There was a significant difference between forest belt and control(p<0.01). ③ At 0-20 cm depth

the dry-aggregates fractal dimension(D) and water-stable aggregates fractal dimension(D) decreased with the decrease of forest density

while an opposite trend was showed at 20-60 cm depth.[Conclusion] The structure of soil under the forest belt is better than the abandoned farmland. The forest belt increases soil clay content and enhances the stability of the deep soil. As the increase of forest belt density

the soil under forest will be improved effectively

but the aggregate disruption in surface soil will be increased.

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references

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