Abstract
English
Highlights
Soils with high rock fragment content are widespread throughout the world, accounting for about 30% of the land area in Western Europe, for example
The increase of the volumetric content of rock fragments in the soil causes increase in the mean radius of the macropores, especially in the density of macropores with radius>1.4mm,but has little effect on the density of macropores with radius
The results indicate that the rock fragment content and its standard error increase with soil depth (Table 2)
Summary
Soils with high rock fragment content are widespread throughout the world, accounting for about 30% of the land area in Western Europe, for example. In the mountain meadows around Beijing, for example, the content of rock fragments is higher than 22% on the surface of the coarse brown soil (Fu, 2005). In the Gongga Mountains of Sichuan province, rock fragment content is higher than 18.22% at soil depth of 0 to 30 cm (Cheng et al, 2004). Rock fragments play an important role in the physical properties of soils including bulk density, hydraulic properties (Torri et al, 1994; Valentin, 1994; Ingelmo et al, 1994; Pérez, 1998), hydrological processes such as infiltration (Brakensiek and Rawls, 1994) and soil evaporation (Li et al, 2006), in runoff and soil erosion (Descroix et al, 2001; Cerdà, 2001), and in soil degradation (Valentin, 1994; Poesen and Lavee 1994)
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