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the black soil
In this paper, a typical small watershed named Tongshuang in the black soil region of northeast China, which was subjected to drastic erosion before 1980 and was managed subtly after 1980, was chosen as a study area.
      
Formation causes and recovery of the "Black Soil Type" degraded alpine grassland in Qinghai-Tibetan Plateau
      
The formation causes and ecological rebuilding of the "Black Soil Type" degraded alpine grassland are summarized.
      
The formation of the "Black Soil Type" degraded grassland was caused mainly by climate warming, decreasing glaciers, overgrazing, and damage by rats.
      
The ecological restoration of the "Black Soil Type" degraded alpine grassland relies not only on grassland building, but also on reasonable management and planning of grassland resources.
      
We found that soil erosion rate over long slopes in the black soil region changed alternatively along the slope and creates alternative zones of intensive erosion and week erosion.
      
Spatial variability of soil properties in relation to land use and topography in a typical small watershed of the black soil reg
      
Soil degradation resulted from unreasonable land use and erosion has been a serious problem in the black soil region of northeastern China.
      
The black soil derived from volcanic ash had high sulfate adsorption capacity and showed no release of sulfate, while some of the surface horizons of the other soils desorbed sulfate.
      
In the brown and the dark brown soils, which are more arid than the black soil zone, trees had 60.6% and 65.5%, respectively, of the biomass and carbon content of trees and shrubs in the black soil zone.
      
Spatial Variability of Soil Organic Carbon in Relation to Environmental Factors of a Typical Small Watershed in the Black Soil R
      
A total of 292 soil samples were taken from surface soil (0-20 cm) of a typical small watershed-Tongshuang in the black soil region of Heilongjiang province, northeast China in June 2005 for examining the concentration of soil organic carbon (SOC).
      
Soil Fertility Quality and Agricultural Sustainable Development in the Black Soil Region of Northeast China
      
The black soil in northeast China is considered one of the most fertile soils in China.
      
Consequently, the black soil region has become one of the most important regions for cereal grain production in China.
      
North Carolina rock phosphate used in this study was as good as superphosphate in the laterite and red soils, but was also as poor as control in the black soil.
      
As the black soil contained enough of CaCO3 initially the addition of CaCO3 even upto 16% is not effective.
      
The silica content and uptake in the crop was low in all except the black soil.
      
Results indicated greater uptake of106Ru and125Sb from the black soil than from the laterite.
      
In contrast, the uptake of144Ce and137Cs was greater in the laterite than in the black soil.
      
 

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