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| DOI：10.13522/j.cnki.ggps.2024399 |
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| Soil water infiltration in Pinus tabuliformis plantation in the Ziwuling |
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MA Wenchang, SUN Yubo, LIN Fei, LUO Chengjiang, WANG Dengjie, QIAO Bin
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1. School of Agriculture and Bioengineering, Longdong University, Qingyang 745000, China;
2. Gansu Key Laboratory of Protection and Utilization for Biological Resources and Ecological Restoration,
Qingyang 745000, China; 3. Gansu Ziwuling Ecological System Observation and Research Station, Qingyang 745000, China
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| Abstract: |
| 【Objective】Soil water infiltration is critical for moisture retention, vegetation growth and long-term ecosystem stability, particularly in ecologically fragile areas like the Loess Plateau. Pinus tabuliformis is a key species used in regional reforestation and plays a vital role in soil hydrological processes. This paper investigates soil water infiltration in P. tabuliformis plantations with different stand densities in the Ziwuling region of the Loess Plateau.【Method】Field experiments were conducted in August 2023 at the Lianjiabian Forest Farm, Heshui County, Gansu Province. Five stand densities, 2 222, 3 200, 4 802, 6 250 and 7 503 plants/hm2, were selected. Soil water infiltration in each stand was measured using the double-ring infiltrometer method. Five models were evaluated for their ability to simulate water infiltration: the General Infiltration Model, the Jiang Dingsheng Model, the Horton Model, the Philip Model, and the Kostiakov Model.【Result】① With increasing stand density, the initial infiltration rate, steady infiltration rate, average infiltration rate and cumulative infiltration showed unimodal trends, all peaking at stand density of 4 802 plants/hm2; their corresponding average values were 18.27 mm/min, 11.31 mm/min, 13.57 mm/min, and 143.45 cm, respectively. ② Cumulative infiltration under different stand density ranked (from high to low) in the order of 4 802＞6 250＞7 503＞3 200＞2 222 plants/hm2. ③ Overall, soil infiltration capacity, based on all indicators, ranked with stand density in the order of 4 802＞6 250＞3 200＞7 503＞ 2 222 plants/hm2. ④ The R2 value of the general infiltration model, the Jiang Dingsheng model, the Horton model, the Philip model and the Kostiakov model was 0.985, 0.966, 0.951, 0.867 and 0.760, respectively.【Conclusion】Among all stand densities of Pinus tabuliformis plantations, the density 4 802 plants/hm2 had the highest water infiltration capacity, showing superior water conservation potential. The general infiltration model proved to be the most suitable for simulating soil water infiltration processes in this region. |
| Key words: Pinus tabuliformis plantation; density gradient; soil infiltration characteristics; infiltration model; Ziwuling |
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