Analysis of Water Infiltration Characteristics and Hydraulic Parameters of Sierozem Soil under Humic Acid Addition
The farmland in Yinchuan is composed of sierozem soil, which is characterized by high sand content and low organic matter content, resulting in poor water-holding capacity and weak soil structure. Humic acid is a natural organic polymer soil amendment. It is critical to study how humic acid affects...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-05-01
|
| Series: | Water |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4441/15/10/1915 |
| _version_ | 1797597994906812416 |
|---|---|
| author | Xian Ma Yiru Bai Xu Liu Youqi Wang |
| author_facet | Xian Ma Yiru Bai Xu Liu Youqi Wang |
| author_sort | Xian Ma |
| collection | DOAJ |
| description | The farmland in Yinchuan is composed of sierozem soil, which is characterized by high sand content and low organic matter content, resulting in poor water-holding capacity and weak soil structure. Humic acid is a natural organic polymer soil amendment. It is critical to study how humic acid affects soil water infiltration in sierozem soil at the microlevel. A one-dimensional vertical infiltration experiment was conducted to explore how adding different amounts of humic acid (0, 1%, 2%, 3% and 4%) affected the infiltration characteristics and hydraulic parameters of the sierozem soil. The results revealed that the wetting front and cumulative infiltration decreased with the increase in humic acid addition. When the infiltration time was 90 min, the wetting front of the 1%, 2%, 3% and 4% treatments was 6.50%, 10.00%, 15.00% and 21.00% lower than CK (0 for CK), and the cumulative infiltration volume was 4.50%, 11.14%, 18.42% and 23.60% lower than CK, respectively. Among the three infiltration models created by Philip, Horton and Kostiakov, the Kostiakov model (R<sup>2</sup> > 0.95) could more accurately describe the soil water infiltration process in the study area. After infiltration, the moisture content of each soil layer increased with the increase in humic acid, which improved the water-holding capacity of the sierozem soil. Using Hydrus-1D to calculate soil hydraulic parameters, we found that the humic acid addition affected the hydraulic parameters. With the increase in the amount of humic acid addition, the retention water content <i>θr</i> and saturated water <i>θs</i> were positively correlated with the humic acid addition amount and negatively correlated with the saturated water conductivity <i>Ks</i> and the reciprocal of air-entry <i>α</i>. The results showed that humic acid could increase the water-holding capacity of soil and improve the rapid water loss and poor water-holding capacity of sierozem soil. |
| first_indexed | 2024-03-11T03:13:08Z |
| format | Article |
| id | doaj.art-1ba47efce05441f9b871e1de744d3031 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-11T03:13:08Z |
| publishDate | 2023-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-1ba47efce05441f9b871e1de744d30312023-11-18T03:42:17ZengMDPI AGWater2073-44412023-05-011510191510.3390/w15101915Analysis of Water Infiltration Characteristics and Hydraulic Parameters of Sierozem Soil under Humic Acid AdditionXian Ma0Yiru Bai1Xu Liu2Youqi Wang3School of Geography and Planning, Ningxia University, Yinchuan 750021, ChinaSchool of Geography and Planning, Ningxia University, Yinchuan 750021, ChinaSchool of Geography and Planning, Ningxia University, Yinchuan 750021, ChinaSchool of Geography and Planning, Ningxia University, Yinchuan 750021, ChinaThe farmland in Yinchuan is composed of sierozem soil, which is characterized by high sand content and low organic matter content, resulting in poor water-holding capacity and weak soil structure. Humic acid is a natural organic polymer soil amendment. It is critical to study how humic acid affects soil water infiltration in sierozem soil at the microlevel. A one-dimensional vertical infiltration experiment was conducted to explore how adding different amounts of humic acid (0, 1%, 2%, 3% and 4%) affected the infiltration characteristics and hydraulic parameters of the sierozem soil. The results revealed that the wetting front and cumulative infiltration decreased with the increase in humic acid addition. When the infiltration time was 90 min, the wetting front of the 1%, 2%, 3% and 4% treatments was 6.50%, 10.00%, 15.00% and 21.00% lower than CK (0 for CK), and the cumulative infiltration volume was 4.50%, 11.14%, 18.42% and 23.60% lower than CK, respectively. Among the three infiltration models created by Philip, Horton and Kostiakov, the Kostiakov model (R<sup>2</sup> > 0.95) could more accurately describe the soil water infiltration process in the study area. After infiltration, the moisture content of each soil layer increased with the increase in humic acid, which improved the water-holding capacity of the sierozem soil. Using Hydrus-1D to calculate soil hydraulic parameters, we found that the humic acid addition affected the hydraulic parameters. With the increase in the amount of humic acid addition, the retention water content <i>θr</i> and saturated water <i>θs</i> were positively correlated with the humic acid addition amount and negatively correlated with the saturated water conductivity <i>Ks</i> and the reciprocal of air-entry <i>α</i>. The results showed that humic acid could increase the water-holding capacity of soil and improve the rapid water loss and poor water-holding capacity of sierozem soil.https://www.mdpi.com/2073-4441/15/10/1915humic acidsoil water-holding capacityHydrus-1Dhydraulic parameters |
| spellingShingle | Xian Ma Yiru Bai Xu Liu Youqi Wang Analysis of Water Infiltration Characteristics and Hydraulic Parameters of Sierozem Soil under Humic Acid Addition Water humic acid soil water-holding capacity Hydrus-1D hydraulic parameters |
| title | Analysis of Water Infiltration Characteristics and Hydraulic Parameters of Sierozem Soil under Humic Acid Addition |
| title_full | Analysis of Water Infiltration Characteristics and Hydraulic Parameters of Sierozem Soil under Humic Acid Addition |
| title_fullStr | Analysis of Water Infiltration Characteristics and Hydraulic Parameters of Sierozem Soil under Humic Acid Addition |
| title_full_unstemmed | Analysis of Water Infiltration Characteristics and Hydraulic Parameters of Sierozem Soil under Humic Acid Addition |
| title_short | Analysis of Water Infiltration Characteristics and Hydraulic Parameters of Sierozem Soil under Humic Acid Addition |
| title_sort | analysis of water infiltration characteristics and hydraulic parameters of sierozem soil under humic acid addition |
| topic | humic acid soil water-holding capacity Hydrus-1D hydraulic parameters |
| url | https://www.mdpi.com/2073-4441/15/10/1915 |
| work_keys_str_mv | AT xianma analysisofwaterinfiltrationcharacteristicsandhydraulicparametersofsierozemsoilunderhumicacidaddition AT yirubai analysisofwaterinfiltrationcharacteristicsandhydraulicparametersofsierozemsoilunderhumicacidaddition AT xuliu analysisofwaterinfiltrationcharacteristicsandhydraulicparametersofsierozemsoilunderhumicacidaddition AT youqiwang analysisofwaterinfiltrationcharacteristicsandhydraulicparametersofsierozemsoilunderhumicacidaddition |