Mathematics – Logic
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3424s22w&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 24, CiteID L24S22
Mathematics
Logic
2
Hydrology: Eco-Hydrology
Scientific paper
Improving structure of soils found at 0-5 cm depth, and increasing the thickness of biological soil crusts are both associated with sand dune revegetation-stabilization in arid northwestern China. Since 1956, research on sand dune stabilization has included the use of straw chequer-boards to facilitate development of soil structure. One method to gauge the degree of stabilization is to compare undisturbed soil hydraulic properties, including water retention [h($\theta$)] and hydraulic conductivity [K(h)] functions, with properties from stabilized sites of different ages. This study examined properties at five experimental sites of different ages since revegetation (51, 42, 34, 20 and 0 years). Saturated hydraulic conductivity (K s ) was determined in-situ from all five sites, and the h($\theta$) curve was determined from samples collected from three sites. A significant negative correlation existed between K s and the clay, silt and organic matter contents. Differences in most van Genuchten parameters for h($\theta$) were observed between the revegetated plots and the migrating sand dune area. Results of this long-term study show that changes in soil hydraulic properties and improvement in soil structure were associated with migrating dune stabilization.
Li Xiang-Ru
Wang Xue Ping
Young Michael H.
Yu Zhenbao
Zhang Zhou-Sheng
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