The effects of different mulching way on soil water thermal characteristics in pear orchard in the arid area Dynamics of soil nutrient contents in cutting forestlands of broad-leaved Korean pine forest on Changbai Mountains Efects of Conservation tillage and crop residues on soil nutrient contents Responses of contents of soil nutrient factors and water to stocking rates for yaks in Kobresia parva alpine meadow Ⅰresponses to contents of soil nutrient factors and water to stocking rates in summer pasture