水保所知识产出(1956---)知识库

Plant residual is of great importance in retarding soil wind erosion in the agro-pastoral
ecotone. However, few studies have determined the effects of sand plant residual on wind
erosion resistance. Based on field surveys, the influences of Salix residual biomass of 200,
400, 600, and 800g m −2 , soil incorporated with a residual thickness of 0.5, 1.0, and
2.0 cm, and typical proportion of residual branches and leaves (2:1, 1:1, and 1:2) on wind
erosion resistance were investigated using a simulated wind tunnel. The results showed
the following: 1) The soil loss amount ranged from 1.56 to 40.8 kg m −2 as Salix residual
biomass decreased from 800 to 0 gm −2 , with a critical residual biomass value of
400 gm −2 . 2) As the thickness of soil-incorporated residual increased, the soil loss
amount reduced rapidly, especially for 0–9cm above the surface accounting for 84.6%
of the total. 3) Salix branch residual is more important in resisting soil wind erosion as
compared with its leaves. This kind of study may provide theoretical explanations for the
optimal reconstruction of sandy vegetation in the northern wind-sand regions.