生态环境学报 ›› 2022, Vol. 31 ›› Issue (10): 1993-2001.DOI: 10.16258/j.cnki.1674-5906.2022.10.007

• 研究论文 • 上一篇    下一篇

新丰江水库库区水源涵养林土壤饱和导水率特征

刘佩伶1(), 刘效东1, 冯英杰1, 苏宇乔2, 甘先华2, 张卫强2,*()   

  1. 1.华南农业大学林学与风景园林学院,广东 广州 510642
    2.广东省森林培育与保护利用重点实验室/广东省林业科学研究院,广东 广州 510520
  • 收稿日期:2022-06-23 出版日期:2022-10-18 发布日期:2022-12-09
  • 通讯作者: *张卫强(1976年生),男,博士,主要从事森林水文与生态修复研究。E-mail: 584674651@qq.com
  • 作者简介:刘佩伶(1996年生),女,硕士,主要从事森林生态水文研究。E-mail: liupl@scbg.ac.cn
  • 基金资助:
    广东省林业科技创新项目(2021KJCX003);国家林业和草原局林草科技创新平台运行补助项目(2022132250);国家林业和草原局林草科技创新平台运行补助项目(2022132249);广州市科技计划项目(202201010640);广东省林业科技创新平台项目(2022-KYXM-09)

Characteristics of Soil Saturated Hydraulic Conductivity of Water Conservation Forests in the Xinfengjiang Reservoir Area

LIU Peiling1(), LIU Xiaodong1, FENG Yingjie1, SU Yuqiao2, GAN Xianhua2, ZHANG Weiqiang2,*()   

  1. 1. College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, P. R. China
    2. Guangdong Key Laboratory of Silviculture, Protection and Utilization/Guangdong Academy of Forestry, Guangzhou 510520, P. R. China
  • Received:2022-06-23 Online:2022-10-18 Published:2022-12-09

摘要:

饱和导水率近似于土壤稳定入渗速率,是评估森林生态系统土壤水文功能的重要参数。以新丰江水库库区3种不同水源涵养林即针叶林、针阔叶混交林和常绿阔叶林为研究对象,采用恒定水头法测定水源涵养林不同层次土壤饱和导水率大小,同时测定土壤理化性质,利用相关分析和多元线性回归分析的方法,探讨了土壤饱和导水率的变化特征及其主要影响因素。结果表明,随着森林植被组成的复杂化,土壤饱和导水率呈上升趋势。0—100 cm土层范围内,常绿阔叶林饱和导水率的算术平均值[(0.24±0.06) mm·min-1]大于针阔混交林[(0.18±0.04) mm·min-1]和针叶林[(0.18±0.05) mm·min-1]的相应值。各林型土壤剖面上饱和导水率随着土层深度增加大致呈下降趋势,介于(0.05±0.02)—(0.41±0.13) mm·min-1之间。常绿阔叶林0—20 cm土壤饱和导水率达 (0.34±0.05) mm·min-1,是针阔混交林1.3倍[(0.26±0.06) mm·min-1]和针叶林的1.2倍[(0.29±0.09) mm·min-1]。Pearson相关性分析结果显示,土壤饱和导水率与容重(P=0.000)、非毛管孔隙度(P=0.009)、土壤有机质(P=0.000)和>0.25 mm水稳性团聚体质量分数(P=0.001)呈极显著相关关系。多元线性回归分析结果表明,土壤容重是影响土壤饱和导水率的主要因素,土壤饱和导水率随着土壤容重的增加而下降。总体上,森林植被结构的复杂化有利于土壤饱和导水率的提升并促进水分入渗。该研究揭示了新丰江水库库区水源涵养林土壤层的水分入渗能力,为森林生态系统水源涵养功能评估以及高质量水源涵养林建设提供参考。

关键词: 水源涵养林, 土壤饱和导水率, 土壤理化性质, 土壤水文功能, 新丰江水库库区

Abstract:

Saturated hydraulic conductivity is quite similar to the steady infiltration rate of the soil by water, and is important to evaluate the soil hydrological function of forest ecosystems. Therefore, the current experiment was performed to evaluate the potential of soil saturated hydraulic conductivity of different layers of water conservation forests by taking three kinds of water conservation forests in the Xinfengjiang Reservoir, namely, coniferous forest, coniferous and broad-leaved mixed forest, and evergreen broad-leaved forest. The soil saturated hydraulic conductivity of different layers in the water conservation forests was measured using the constant water head method, and the soil physical and chemical properties were also investigated. The variation characteristics of soil saturated hydraulic conductivity and its main influencing factors were analyzed using correlation and multiple linear regression analyses. The results showed that soil saturated hydraulic conductivity showed an upward trend by the forest vegetation composition being more complex. Compared with the coniferous and broad-leaved mixed forest [(0.18±0.04) mm·min-1] and the coniferous forest [(0.18±0.05) mm·min-1], the saturated hydraulic conductivity of the evergreen broad-leaved forest [(0.24±0.06) mm·min-1] was greater across the 0-100 cm depth. The saturated hydraulic conductivity generally decreased with increasing soil depth in different forests, ranging from (0.05±0.02) mm·min-1 to (0.41±0.13) mm·min-1. The saturated hydraulic conductivity for the 0-20 cm depth in the evergreen broad-leaved forest was (0.34±0.05) mm·min-1, which was 1.3 times greater in comparison with the coniferous and broad-leaved forest [(0.26±0.06) mm·min-1] and 1.2 times greater than the coniferous forest [(0.29±0.09) mm·min-1]. Pearson correlation analysis showed that the saturated hydraulic conductivity of soil was significantly correlated with the bulk density (P=0.000), non-capillary porosity (P=0.009), soil organic matter (P=0.000), and the mass fraction of >0.25 mm water stable aggregates (P=0.001). The results of the multiple linear regression analysis showed that soil bulk density was the main factor affecting soil saturated hydraulic conductivity, and soil saturated hydraulic conductivity decreased with the increase of soil bulk density. In general, the complexity of forest vegetation structure enabled the improvement of soil saturated hydraulic conductivity and promoted water infiltration. This study reveals the infiltration capacity of the soil layer in the water conservation forests of the Xinfengjiang Reservoir, and provides a support for the evaluation of the water conservation function of the forest ecosystems and the construction of high-quality water conservation forests.

Key words: water conservation forests, saturated hydraulic conductivity of soil, physical and chemical properties of soil, hydrological functions of the soils, Xinfengjiang Reservior Area

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