| Effects of biochar on soil water holding and infiltration characteristics of red soil slope cropland |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2025.02.19 |
| Key Words: red soil sloping cropland soil water holding capacity soil infiltration characteristics biochar |
| Author Name | Affiliation | | HU Yanmei | College of Water Conservancy, Yunnan Agricultural University, Kunming, Yunnan 650201, China
Engineering Research Center for Green Smart Farmland and Carbon Emission Reduction in Yunnan Universities, Kunming, Yunnan 650201, China | | CHEN Zhengfa | College of Water Conservancy, Yunnan Agricultural University, Kunming, Yunnan 650201, China
Engineering Research Center for Green Smart Farmland and Carbon Emission Reduction in Yunnan Universities, Kunming, Yunnan 650201, China | | YAN Keyu | College of Water Conservancy, Yunnan Agricultural University, Kunming, Yunnan 650201, China
Engineering Research Center for Green Smart Farmland and Carbon Emission Reduction in Yunnan Universities, Kunming, Yunnan 650201, China | | WANG Daoxiang | College of Water Conservancy, Yunnan Agricultural University, Kunming, Yunnan 650201, China
Engineering Research Center for Green Smart Farmland and Carbon Emission Reduction in Yunnan Universities, Kunming, Yunnan 650201, China | | DUAN Qingsong | College of Water Conservancy, Yunnan Agricultural University, Kunming, Yunnan 650201, China | | ZHANG Chuan | College of Water Conservancy, Yunnan Agricultural University, Kunming, Yunnan 650201, China |
|
| Hits: 4 |
| Download times: 0 |
| Abstract: |
| To examine the impact of biochar addition on water retention and infiltration characteristics in red soil slope cropland, four biochar application levels were established based on soil quality: 0% (S0), 1% (S1), 3% (S2), and 5% (S3).The physicochemical properties of the soil and the microstructural changes observed through electron microscopy under different biochar addition conditions were analyzed to assess the water retention characteristics. Simultaneously, the indoor double\|ring method was used to determine the infiltration characteristics of the soil, and a suitable soil infiltration model was selected. The results showed that: (1) With the increase of biochar addition, the content of soil micro\|aggregates (<0.25 mm) significantly decreased. During the entire growth period, the average micro\|aggregate content in the S1, S2, and S3 treatments decreased by 4.44%, 5.89%, and 15.82%, respectively, compared to the S0 treatment. In contrast, the content of macro\|aggregates represented by particle sizes of 0.25~0.5 mm and 0.5~1.0 mm significantly increased. During the entire growth period, the average content of macro\|aggregates in the S1, S2, and S3 treatments increased by 4.21%, 5.58%, and 14.99%, respectively, compared to S0. The average bulk density of the soil in the S1, S2, and S3 treatments decreased by 2.30%, 4.25%, and 6.48% compared to S0 (P<0.05). The total pore volume, water content, and organic carbon content of the soil significantly increased. During the entire growth period, the total pore volume for S1, S2, and S3 treatments increased by 1.37%, 2.21%, and 3.96%, respectively, while the water content increased by 10.04%, 16.62%, and 19.30%, and the organic carbon content increased by 14.01%, 38.26%, and 46.23% (P<0.05). (2) Electron microscopy showed that the microscopic particles of red soil exhibited a flaky structure, and with the increase of biochar addition, the specific surface area of soil particles significantly increased, facilitating the formation of pore channels between soil particles. (3) Adding biochar was beneficial for enhancing soil water retention, but it exhibited a notable hindrance effect on the soil infiltration process, which became more pronounced increasing biochar addition. (4) The Philip, Horton, Kostiakov, Green-Ampt, and NRCS models all described the soil infiltration process under biochar addition conditions well, with the Kostiakov model showing the best fitting results. |
|
|
|