The Long-term Variations and Influencing Factors of Soil Saturated Hydraulic Conductivity in Terraces on the Loess Plateau

PENG Xin; NI Lingshan; JI Keyan; DAI Wei; WANG Zhuoxiao; CHANG Heng; FANG Nufang

doi:10.13870/j.cnki.stbcxb.2024.06.008

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The Long-term Variations and Influencing Factors of Soil Saturated Hydraulic Conductivity in Terraces on the Loess Plateau

更新时间：2025-02-18

- The Long-term Variations and Influencing Factors of Soil Saturated Hydraulic Conductivity in Terraces on the Loess Plateau
- Vol. 38, Issue 6, Pages: 122-129(2024)
- 作者机构：
  
  1. 西北农林科技大学水土保持科学与工程学院, 陕西杨凌,712100
  2. 中国科学院水利部水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨凌,712100
  3. 西北农林科技大学水利与建筑工程学院, 陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2024.06.008
  CLC： S152.7
- Published：2024
- 稿件说明：
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PENG Xin, NI Lingshan, JI Keyan, et al. The Long-term Variations and Influencing Factors of Soil Saturated Hydraulic Conductivity in Terraces on the Loess Plateau[J]. 2024, 38(6): 122-129.
DOI：

PENG Xin, NI Lingshan, JI Keyan, et al. The Long-term Variations and Influencing Factors of Soil Saturated Hydraulic Conductivity in Terraces on the Loess Plateau[J]. 2024, 38(6): 122-129. DOI： 10.13870/j.cnki.stbcxb.2024.06.008.

摘要

[目的] 探究黄土高原梯田土壤饱和导水率(Ks)的长期变化及其主控因素。[方法] 选取农田、果园及草地3种土地利用类型的梯田

以坡面为对照

采集坡面及修筑年限为7

40年梯田的土壤样品

测定Ks及土壤理化性质。使用Kruskal-Wallis H检验、Spearman相关性分析、偏最小二乘路径模型(PLS-PM)分析修筑梯田对Ks的影响、Ks随时间的变化及其影响因素。[结果] (1)不同利用类型梯田Ks随修筑年限增加表现出不同的规律。7

40年农田Ks持续增长

从0.18 mm/min增加至0.28 mm/min

增长率为55.56%。果园Ks先增加

30年后出现下降趋势

其中30年果园Ks显著高于7年果园Ks

从0.12 mm/min增加至0.35 mm/min

增长率为191.67%。草地Ks先增加

20年后则保持相对稳定

其中20年草地Ks显著高于7年草地Ks

从0.14 mm/min增加至0.31 mm/min

增长率为121.43%。(2)影响Ks的主要因素为土壤粒径分布、土壤质量密度、团聚体平均重量直径

其路径系数分别为-0.431

-0.561

0.226。[结论] 梯田利用类型对土壤性质影响程度的差异导致梯田Ks随修筑年限的增加呈现不同规律

研究结果可为梯田后续管理及发展高效旱作农业提供依据。

Abstract

[Objective] The long-term variations of soil saturated hydraulic conductivity (Ks) and its primary controlling factors in terraces on the Loess Plateau were explored. [Methods] Terraces were selected for three land use types

i.e. farmland

orchard

and grassland

with slope designated as the control. Soil samples were collected from slopes and terraces with construction ages of 7

30 and 40 years to determine the Ks and soil physicochemical properties. The Kruskal-Wallis H test

Spearman correlation analysis

and partial least squares path model (PLS-PM) were conducted to examine the impact of terrace construction on Ks and its temporal variations

as well as the influencing factors. [Results] (1) The Ks of terraces under different land use types exhibited varying patterns with increasing ages of terrace construction. The Ks of farmland increased continuously with construction age of 7

30 and 40 years

increasing from 0.18 mm/min to 0.28 mm/min

with a growth rate of 55.56%. The Ks of orchard increased with the increase of construction years firstly

then showed a decreasing trend after 30 years

and the Ks of orchard with a construction age of 30 years was significantly higher than that of orchard with a construction age of 7 years

increasing from 0.12 mm/min to 0.35 mm/min

with a growth rate of 191.67%. The Ks of grassland increased with the increase of construction years firstly

then remained relatively stable after 20 years

and the Ks of grassland with a construction age of 20 years was significantly higher than that of grassland with a construction age of 7 years

increasing from 0.14 mm/min to 0.31 mm/min

with a growth rate of 121.43%. (2) The primary factors influencing Ks included soil particle size distribution

soil bulk density

and mean weight diameter of aggregates

with the path coefficients being -0.431

-0.561 and 0.226

respectively. [Conclusion] The variation in the impact of terrace land use types on soil properties resulted in varying patterns of Ks with increasing ages of terrace construction. The results can provide a basis for the subsequent management of terraces and the development of efficient dryland farming.

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