In order to study the effects of litter decomposition on soil nitrogen Piceamongolica in different forest ages, young (0–5a), middle-aged (5–30a), and near-mature (30–40a) stands were selected Baiyinaobao National Nature Reserve. Litter was assessed using bag method. The seasonal vertical spatial variation characteristics total N, NH4+—N, NO3−—N caused by P. mongolica studied for stand ages. Re...

introduction in dry areas, water is the limiting factor in improving agricultural production. saving the annual precipitation in the soil is very effective in dryland farming. the amount of rainfall that infiltrates the soil depends on the amount of soil permeability and runoff. the surface remains will be able to better permeable prevent runoff and raindrops and reduce erosion. in addition, ev...

Extensive limb lengthening (ELL) was completed in 75 patients: 66 achondroplasia and 9 hypochondroplasia. The average 27 cm for (12–40 cm) 17 hypochondroplasia (range 10–25 cm). There were 48 females males. Lengthening done either by 2-segment (14 patients; both tibias and/or femurs) or 4-segment lengthenings (64 femurs at the same time). Most patients also had bilateral humeral lengthening. Pa...