文章摘要
骆紫藤,牛健植,孟晨,张英虎,杜晓晴,蔺星娜,贾京伟.华北土石山区森林土壤中石砾分布特征对土壤大孔隙及导水性质的影响[J].水土保持学报,2016,(3):
华北土石山区森林土壤中石砾分布特征对土壤大孔隙及导水性质的影响
Effects of Distribution of Rock Fragment on Macropores and Saturated Water Conductivity in Forest Soil in Rocky Mountain Area of Northern China
投稿时间:2016-01-20  修订日期:2016-03-09
DOI:
中文关键词: 华北土石山区  石砾  大孔隙  饱和导水率
英文关键词: Rocky mountain area of northern China  Stone  Macropores  Saturated conductivity
基金项目:国家自然科学“林木根系对溶质优先运移影响机制研究”(41271044)
作者单位邮编
骆紫藤 北京林业大学水土保持学院 100083
牛健植 北京林业大学水土保持学院 100083
孟晨 北京林业大学水土保持学院 
张英虎 北京林业大学水土保持学院 
杜晓晴 北京林业大学水土保持学院 
蔺星娜 北京林业大学水土保持学院 
贾京伟 北京林业大学水土保持学院 
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中文摘要:
      华北土石山区土壤石砾含量丰富,对大孔隙形成及水分运移具有重要影响。为了探究土壤中石砾对大孔隙形成的作用及对土壤饱和导水率的影响,本文研究了京郊密云水库水源涵养林内土壤石砾分布特征、大孔隙分布特征以及与饱和导水率之间的关系。结果表明:(1)林区0-30 cm土壤层内石砾体积含量范围为7.10%~22.05%,质量含量范围为10.76%~38.20%,且石砾多集中分布于5~10 mm粒径范围内;石砾含量随坡向呈现阳坡>阴坡>半阴半阳坡的规律;(2)石砾含量与当量孔径>1.5 mm的孔隙密度呈现极显著相关关系(P<0.01),粒径>5 mm的石砾体积含量与大孔隙密度有显著相关性(P<0.05),说明砾石主要影响较大孔隙,特别是>5 mm的石砾对大孔隙的形成影响较大;(3)当量孔径>1.5 mm的孔隙数量仅占总空隙数量的1.41%,但对导水速率的贡献率为54.44%;饱和导水率与其呈线性关系。探究石砾对大孔隙及饱和导水率的影响,有助于更加全面地认识森林土壤水源涵养机理以及水文调节过程,为石质山区水源利用与保护,水文过程的模型建立提供理论基础。
英文摘要:
      The content of soil stone is rich in the rocky mountain area of North China, which has an important influence on the macropores and water transport. The study was carried on Miyun reservoir in Beijing, in order to explore the relationship among stones, macropores and the soil saturated hydraulic conductivity. The results showed that: (1) Volume content of stone is in the range of 7.10%~22.05%, while mass percent is range from 10.76% to 38.20%. Stones in the size of 5~10mm has highest content in soil. The percentage composition of stone with the slope aspect has regulation as follows: adret slope > semi shaded slope> shade slope; (2) The macropore density of equivalent pore >1.5mm showed very significant correlation relationship with stone content (P<0.01).The volume content of stones with the size >5mm has a significant correlation relationship with macropore density (P<0.05). It illustrate that stones mainly affect macropores with large size, and stones in size of >5mm have a key influence on the formation of macropores. (3) The amount of equivalent pores with size >1.5mm only accounted for 1.41% of the total macropores, but determined the 54.44% of the saturated conductivity. The hydraulic conductivity and the amount of equivalent pores with size >1.5mm has a linear relationship. Exploring the relationship among stones, macropores and saturated hydraulic conductivity can provide a comprehensive understanding of forest soil and water conservation mechanism and hydrological adjusting process. It can also provide theoretical basis to the water resource utilization and protection in Rocky Mountain, and the establishment of hydrological process model.
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