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Characteristics of soil hydrological effects of alpine shrub meadow in western Sichuan(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2021 05
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Characteristics of soil hydrological effects of alpine shrub meadow in western Sichuan
L? Chen1 GONG Yuanbo1? GONG Wei1 CHE Mingxuan1 XU Manjing1 KANG Chengfang1 2 & WU Qiang3
1 College of Forestry, Sichuan Agricultural University, Chengdu 611130, China2 Gansu?Appraisal?Center?for?Eco-Environment?&?Engineering, Lanzhou 730000, China3 Luzhou Water Conservancy, Luzhou 646000, China
shrub meadow soil physical property water holding capacity infiltration performance

The hydrological functions of soil infiltration and water retention are foundational to forest water and soil conservation. In order to investigate the differences in soil physical and chemical properties and hydrological effects at different altitudes and slope aspects, alpine shrub meadow soil from Zheduo Mountain, China, was selected for characterization. The basic physical properties, water holding capacity, and infiltration performance of the soil were studied. The results were as follows: (1) The influence of slope aspect and altitude on soil physical properties was mainly observed on the leached layer. Soil bulk density was generally higher in the sediment layer and semi-shady aspects than in the leaching layer and semi-sunny aspects; it was maximal in the 4 000 m semi-shady slope samples (1.21 g/cm3), and minimal in the 4 000 m semi-sunny slope samples (0.77 g/cm3), whereas total soil porosity showed the opposite pattern. (2) The natural soil water storage capacity, maximum water holding capacity, capillary water holding capacity, and minimum water holding capacity were higher in the leaching layer than in the sedimentary layer, whereas soil storage rainfall and effective storage capacity were higher in semi-sunny aspects than in semi-shady aspects. Soil maximum water holding capacity, capillary water holding capacity, cumulated rainfall, and effective cumulated storage capacity were highest in the leached layer at semi-sunny slope aspects below 4 000 m, with values of 1 336 (± 24.66), 1 016 (± 14.14), 710 (± 26.98), and 390 (± 14.14) t/hm2, respectively. (3) The initial soil infiltration rate and steady infiltration rate were generally higher in the leaching layer and semi-sunny slope than in the sedimentary layer and semi-shady slope. The maximum value of the soil infiltration coefficient, K10, was observed in the 4 200 m semi-slope leaching layer (7.41 mm/min) and the minimum value was observed in the 4 000 m semi-shady slope sediment layer (0.57 mm/min). We observed a clear differentiation of soil physical properties and hydrological functions under different altitudes and slope aspects. Research on soil hydrological functions of soil-rock mixed media may be the focus of future research on soil hydrology in this area.


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Last Update: 2021-10-25