Factors Affecting Macropore Flow in Unsaturated Soil
| Autor: | ZHANG Jinhua, LI Mingsi, HAN Han, LIU Xingshuang, XU Qiang, LAN Mingju |
|---|---|
| Jazyk: | čínština |
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Guan'gai paishui xuebao, Vol 41, Iss 7, Pp 70-77 (2022) |
| Druh dokumentu: | article |
| ISSN: | 1672-3317 34974121 |
| DOI: | 10.13522/j.cnki.ggps.2022023 |
| Popis: | 【Objective】 Preferential flow in macropores is a common hydrological phenomenon in soil. The purpose of this paper is to elucidate the factors that could affect macropore flow. 【Method】 The experiment was conducted in tanks repacked with a fine sandy loam soil. Macropores with diameter of 4 mm were artificially created in the soil with their top ends either exposed to the soil surface or hidden in the soil. The length of the macropores varied from 50 cm to 70 cm, and the initial soil water content varied from 5.7% to 13.3%. The tanks were drip-irrigated by 50 L, 60 L and 70 L of water, respectively. Occurrence of macropore flow was judged by appearance of liquid water on the wall of the macropores at different depths, as well as matric potential in the soil matrix. 【Result】 Macropore flow did occur but varied with soil depth. The probability of its appearance was 2.08%~7.14% in the top 0~30 cm of soil, and 14.58%~19.05% in the 40~70 cm of soil. It was also found that the probability of macropore flow occurring in the macropores which stretched to the soil surface was 13.04%, less than the 27.54% in the macropores hidden in the soil. The factors that affected macropore flow more significantly was ranked in the descending order: pore depth (length) >initial water content >irrigation amount. 【Conclusion】 The vertical length of the macropores affected the occurrence of macropore flow in unsaturated soil most; macropore flow is more likely to occur in the subsoil than in the topsoil. |
| Databáze: | Directory of Open Access Journals |
| Externí odkaz: |
|