土壤基质入渗驱动下桉树人工林地表氮淋失模拟研究

黄幼; 容清标; 廖煜亮; 赵明全; 潘天森; 吴沅桓; 杨钙仁; 黄钰涵

doi:10.13870/j.cnki.stbcxb.2023.03.039

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土壤基质入渗驱动下桉树人工林地表氮淋失模拟研究

更新时间：2025-03-12

- 土壤基质入渗驱动下桉树人工林地表氮淋失模拟研究
- Simulation Study on Nitrogen Leaching on the Surface of Eucalyptus Plantation Driven by Soil Matrix Infiltration
- 水土保持学报 2023年37卷第3期页码：304-311
- 作者机构：
  
  广西大学林学院, 广西森林生态与保育重点实验室,南宁,530004
- 作者简介：
  
  [ "黄幼(1997—)女,广西南宁人,硕士研究生,主要从事土壤水文研究。E-mail:huangyou_2569@163.com" ]
- 基金信息：
  
  广西自然科学基金项目(2021GXNSFBA196020);广西科技基地和人才专项(桂科AD22035032)
- DOI：10.13870/j.cnki.stbcxb.2023.03.039
  中图分类号： S154.3
- 纸质出版：2023
- 稿件说明：
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黄幼, 容清标, 廖煜亮, 等. 土壤基质入渗驱动下桉树人工林地表氮淋失模拟研究[J]. 水土保持学报, 2023,37(3):304-311.

HUANG You, RONG Qingbiao, LIAO Yuliang, et al. Simulation Study on Nitrogen Leaching on the Surface of Eucalyptus Plantation Driven by Soil Matrix Infiltration[J]. 2023, 37(3): 304-311.
黄幼, 容清标, 廖煜亮, 等. 土壤基质入渗驱动下桉树人工林地表氮淋失模拟研究[J]. 水土保持学报, 2023,37(3):304-311. DOI： 10.13870/j.cnki.stbcxb.2023.03.039.

HUANG You, RONG Qingbiao, LIAO Yuliang, et al. Simulation Study on Nitrogen Leaching on the Surface of Eucalyptus Plantation Driven by Soil Matrix Infiltration[J]. 2023, 37(3): 304-311. DOI： 10.13870/j.cnki.stbcxb.2023.03.039.

摘要

为探究土壤基质驱动下桉树人工林施肥措施对地下水体的影响

以短轮伐期内不同林龄桉树(1年、2年、3年、5年)表层土壤(0—20 cm)为研究对象

采用室内填土土柱模拟基质入渗驱动下铵态氮、硝态氮、总溶解态氮和溶解态有机氮的淋失过程

分析基质入渗特征参数与不同形态的溶解态氮淋失过程的变化关系及其影响因素。结果表明:(1)桉树表层土壤基质稳定入渗率和累积入渗量随林龄的增大呈增加—降低—增加的趋势

其中

2年生桉树表层土壤的稳定入渗率(143 mm/h)和累积入渗量(279 mm)最高。(2)不同形态溶解态氮淋失浓度在淋失开始时达到峰值

并随基质入渗率的降低而逐渐减小

且基质入渗率与不同形态溶解态氮淋失浓度的变化关系可用线性方程表示。(3)硝态氮和溶解态有机氮是桉树人工林表层土壤氮淋失的主要形态

砂粒含量增加促进氮淋失

而黏粒和有机质含量增加抑制氮淋失。同时

淋失初期铵态氮淋失浓度高于地下水质控制范围

是污染桉树人工林地下水水质的潜在威胁。综上

土壤基质入渗是桉树人工林表层土壤氮淋失的重要驱动因素

两者变化趋势一致并存在线性关系

同时

土壤砂粒、黏粒与有机质含量也是影响桉树人工林地表层土壤氮淋失的重要影响因素。

Abstract

Under the hydrological processes of soil matrix infiltration

the effect of fertilization measures of eucalyptus plantations during the short rotation period on groundwater needs a new understanding. The surface soil (0-20 cm) of differently aged eucalyptus plantations (1 year

2 years

3 years

and 5years) were used as the research object. Filled soil columns were used to simulate the leaching process of ammonium nitrogen

nitrate nitrogen

total dissolved nitrogen

and dissolved organic nitrogen driven by matrix infiltration. The change between the infiltration characteristic parameters and the leaching process of different forms of dissolved nitrogen and their influence factors were studied. Results showed that: (1) The steady infiltration rate and cumulative infiltration showed an increase-decrease-increase trend with plantation age increment

therein the steady infiltration rate (143 mm/h) and cumulative infiltration (279 mm) of on the suface soil of 2-years old eucalyptus plantation were the largest. (2) The concentrations of different forms of dissolved nitrogen in the leachate reached to the peaks at the beginning of leaching process and gradually decreased with the matrix infiltration rate decrease. Also

the matrix infiltration rates and the concentration of four nitrogen forms in the leachates showed the well linear relationships. (3) The nitrate nitrogen and dissolved organic nitrogen were the main forms of nitrogen leaching on the surface soil of eucalyptus plantations. The sand content increment promoted the nitrogen leaching

while the clay content and soil organic matters increment restrained the nitrogen leaching. Simultaneously

the concentrations of ammonium nitrogen at the initial leaching stage were higher than the threshold of groundwater quality

which was a potential threat causing the groundwater pollution in eucalyptus plantations. In summary

soil matrix infiltration was an important factor of nitrogen leaching of topsoil in eucalyptus plantations

and they had the coupling change trend and a linear relationship. The contents of sand

clay

and soil organic matters were the important factors affecting the nitrogen leaching on the surface soil of eucalyptus plantations.

关键词

Keywords

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