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Our study indicates that the model can be applied to study the interaction between land surface processes and atmospheric boundary layers over various underlying surfaces and their regional climate effects.
      
Regularities of wind-erosion of different land-use types in Yongding River sandy land, Beijing
      
The threshold wind velocity of a number of variables was studied in four different land-use types: farm land, forestland, wild grassland and a flood plain in the Yongding River sandy land in Beijing.
      
The following conclusions were drawn: 1) The order of decreasing threshold of wind speed for sand displacement and surface roughness were forestland, wild grassland, farm land, sparse wild grassland and flood plain.
      
At a height of 0-20 cm, the height increased while the sediment discharge percent of sand flux decreased; there were significant differences in the sand flow formation under different land-use types.
      
3) The mechanical composition of sand particles consisted mainly of silver sand in the flood plain and sparse wild grassland, and of silver sand, particle silver sand and floury sand in other land-use types.
      
4) The amounts of wind erosion and sand sediment were different among different land-use types.
      
Eco-emigration and the return of marginal agricultural land to forestry can be practiced.
      
Thirdly, based on gray cognate analyses of factors affecting runoff and sediment production in sloping land, the factors of stand canopy density and herb and litter biomass were the most significant ones, whose gray incidence degree exceeded 0.6.
      
The content of water stable aggregates in 18-year-old shrub land soil is higher than the 8-year-old shrub land, and the big aggregates (>amp;gt;5 mm) increased for the most part, by 67.4% and 59.0% in different layers, respectively.
      
The contents of aggregates of over 0.25 mm in two shrub land soils in the upper layer (0-20 cm) increased by 4.6% and 14.1% compared with farmland.
      
Nonrepresentative montane mossy dwarf forests (above 2,100 m) in the area are distributed in windward sides and in barren land on the mountain slopes.
      
Shear difference of both undisturbed and remolded soils was compared at the same vertical loading, under the condition of the same dry density and water content from the same forest land.
      
pseudoacacia and Caragana korshinkii, fallow land and P.
      
Many textural measures have been developed and used for improving land cover classification accuracy, but they rarely examined the role of textures in improving the performance of forest aboveground biomass estimations.
      
Sand-fixing effects of Caragana microphylla shrub in Horqin sandy land, North China
      
In the semi-arid Horqin sandy land of north China, Caragana microphylla, a leguminous shrub, is the dominant plant species and is widely used in vegetation reestablishment programs to stabilize shifting sand.
      
mangium forest was measured by using Granier's thermal dissipation probe for over two years in the hilly land of South China.
      
Factors affecting distribution of microbiotic crusts in the grain-for-green land of the loess region, northern Shaanxi, China
      
The average annual biomass of fine roots in ryegrass was twice that of the mixed natural grass-forest land.
      
 

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