| Hydrological functions of several vegetations in Diediegou valley in north Liupan Mountain |
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| DOI：10.7606/j.issn.1000-7601.2013.04.036 |
| Key Words: Larix principis-rupprechtii Hippophae rhamnoides Ostryopsis davidiana grassland canopy interception water holding capacity soil physical property |
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| Abstract: |
| The hydrological functions, in terms of canopy interception and water holding capacity of litters and soil layers, were assessed in several vegetations in the semi-arid region in north part of Liupan Mountain, Ningxia, China. The results indicated that the canopy interception differed notably among different vegetations, with the maximal value (24.80%) in the shrubs of Hippophae rhamnoides, followed by the plantations of Larix principis-rupprechtii(21.40%), and the minimal value (9.25%) in the shrubs of Ostryopsis davidiana. Conversely, the maximal stem flow ratio (33.1%) appeared in the shrubs of Ostryopsis davidiana, which exceeded the general range (2%～10%) of most shrubs in arid and semi-arid regions. From the aspect of seasonal variation, the maximal interception ratio appeared in June, then decreased from July to September, and increased again in October. However, the maximal interception amount appeared in July for all vegetations studied. The highest water holding capacity of litter layers was in the plantations of Larix principis-rupprec
htii, followed by the shrubs of Ostryopsis davidiana and Hippophae rhamnoides and the grassland, being the same as the sequence of litter stock. The soil bulk density in 0～100 cm layer was minimal in the shrubs of Ostryopsis davidiana, and maximal in the shrubs of Hippophae rhamnoides. The total porosity and water-holding capacity were maximal in the plantations of Larix principis-rupprechtii, while the capillary porosity and capillary water-holding capa
city were maximal in the shrubs of Ostryopsis davidiana, and the non-capillary porosity was maximal in the grassland; the worst soil porosities was found in the shrubs of Hippophae rhamnoides. Considering comprehensively the canopy interception, water holding capacity of litters and soil physical properties, the best hydrological functions appeared in the plantations of Larix principis-rupprechtii, then the shrubs of Ostryopsis davidiana and the grassland,
and the worst functions appeared in the shrubs of Hippophae rhamnoides. |
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