YIN Xia, LI Dongmei, LI Yi, et al. Effects of Shrub Encroachment on Soil Hydraulic Properties in Alpine Meadow[J]. 2022, 36(5): 121-129.
DOI:
YIN Xia, LI Dongmei, LI Yi, et al. Effects of Shrub Encroachment on Soil Hydraulic Properties in Alpine Meadow[J]. 2022, 36(5): 121-129. DOI: 10.13870/j.cnki.stbcxb.2022.05.017.
Effects of Shrub Encroachment on Soil Hydraulic Properties in Alpine Meadow
shrub development of alpine meadow has become the main trend of landscape change in Qinghai-Tibet Plateau.In order to better understand the relationship between shrub and alpine meadow ecosystem
this paper taking shrub alpine meadow of Caragana Erinacea Kom and Potentilla Fruticosa in the eastern margin of the Qinghai-Tibet Plateau as an example
characteristics of soil water holding capacity and infiltration capacity during non-shrub
mild shrub
moderate shrub and severe shrub were studied by using ring knife soaking method and double ring infiltration method. The results showed that: (1) Soil bulk density was the lowest and total porosity was the highest in moderate shrub stage. (2) With the increase of degree of shrub
soil water content of two kinds of shrub meadows showed an increasing trend
and it was the highest in heavy shrub stage. Soil capillary water capacity
field water capacity and maximum water capacity showed a parabolic trend
and maximum water capacity was the highest in moderate shrub stage. (3) The initial infiltration rate
stable infiltration rate and infiltration rate of two kinds of shrub meadow showed an increasing trend with increase of degree of shrub
and infiltration rates in moderate and severe shrub stages was significantly higher than that in non-shrub stage. (4) Correlation analysis showed that soil infiltration index was significantly correlated with soil water content and non-capillary porosity. Therefore
changes of soil hydraulic properties usually occur in moderate and severe shrub stages during alpine meadow shrub development.
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references
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