渭北黄土丘陵区人工林类型对土壤属性的影响
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S714.2

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国家自然科学基金项目(41907053)、陕西省教育厅科研计划项目(20JK0971)和咸阳师范学院校级项目(XSYK19027)资助。


Effects of Artificial Forest Types on Soil Properties in Loess Hilly Area of Weibei of Shaanxi
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    摘要:

    为了研究渭北黄土丘陵区人工林类型对土壤属性的影响,选取位于同一坡面上的刺槐纯林、油松纯林和苹果园土壤为研究对象,分析了土壤结构稳定性,土壤有机碳、无机碳和土壤呼吸等土壤属性在3种人工林土壤剖面的变化特征,并探讨了土壤有机碳和无机碳在水稳性团聚体形成中的作用。结果表明:3种人工林土壤团聚体破碎率均较高,各团聚体水稳性指标值、土壤有机碳含量、土壤呼吸在3个样地的顺序均为油松林>刺槐林>苹果园,土壤无机碳含量的顺序为刺槐林>苹果园>油松林。土壤有机碳和无机碳含量之间呈负相关关系,且二者分别与团聚体水稳性呈正相关和负相关关系,但同时,无机碳含量存在一个阈值,当低于或高于这一阈值时,其含量与团聚体水稳性分别呈正相关或负相关关系,因此,当无机碳含量较高时,应降低其含量,并提高土壤有机碳含量,以改善土壤结构,降低土壤遭受侵蚀的风险;土壤结构稳定性各指标之间及其与土壤有机碳含量和土壤呼吸呈极显著正相关关系。可见,人工林类型显著影响各项土壤属性,油松林在提高土壤质量方面的作用大于刺槐林。

    Abstract:

    The soils were collected from Robinia pseudoacacia pure forest, Pinus tabulaeformis pure forest and apple orchard on the same slope, soil structure stability (aggregate composition), organic carbon, inorganic carbon and soil respiration were determined, and then the effects of artificial forest types on soil properties in the loess hilly area of Weibei of Shaanxi and the roles of soil organic and inorganic carbon in the formation of water stable aggregates were discussed. The results showed that disaggregation rates of soil aggregates were high under the three forest types. Water stability indexes of soil aggregates, soil organic carbon and respiration in the three forest types were in the order of Pinus tabulaeformis > Robinia pseudoacacia > Malus pumila, soil inorganic carbon was in the order of Robinia pseudoacacia > Malus pumila > Pinus tabulaeformis. Negative correlation existed between soil organic carbon and inorganic carbon, and they were positively and negatively correlated with water stability of aggregates respectively. Meanwhile, inorganic carbon had a threshold value, positive or negative correlation with water stability of aggregates existed when it was lower or higher than the threshold value. Therefore, when inorganic carbon is high, measures should be taken to decrease it and increase soil organic carbon for the improvement of soil structure and the alleviation of soil erosion. Significant positive correlations existed among different stability indexes of soil structure and between stability indexes of soil structure with soil organic carbon and respiration. In conclusion, artificial forest type can significantly affect soil properties and Pinus tabulaeformis is better than Robinia pseudoacacia in improving soil quality.

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董莉丽,寇萌.渭北黄土丘陵区人工林类型对土壤属性的影响[J].土壤,2021,53(4):841-849. DONG Lili, KOU Meng. Effects of Artificial Forest Types on Soil Properties in Loess Hilly Area of Weibei of Shaanxi[J]. Soils,2021,53(4):841-849

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  • 收稿日期:2020-06-23
  • 最后修改日期:2020-09-08
  • 录用日期:2020-09-10
  • 在线发布日期: 2021-08-20
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