Study On Afforestation Technology Of Pinus Sylvestris Linn. Var. Mongolica Litv In Keerqin Sandy Land

We mainly studied the Balin right county which is located in the west of the Keerqin sandy land. We compared some advanced afforestation technologies such as plant sand barrier afforestation,plastics covering afforestation, Driwateric afforestation, keep water afforestation and ABT rooting powder afforestation and analyzed the effect of watering volume on survival rate of Pinus sylvestris Linn.var.mongolica Litv seedlings and growth. Then dedide the best methods of afforestation seedling cultivate and sand barrier sizes at this area.The result of comparing 8m × 24m, 12m× 24m, 16m × 24m and 20m × 24m sizes Salix gordjevii Chang et.Skv.sand barrier showed that 8m×24m size Salix gordjevii Chang et. Skv. sand barrier had the best fixing sand effect when Pinus sylvestris Linn. var. mongolica Litv row spacing was 4m×4m. This size of sand barrier not only fixed sand but protected Pinus sylvestris Linn. var. mongolica Litv seedling and the survival rate of it was higher than 20m×24m size 11.67 per cent.Plastic covering treatment not only maintained soil water content but increased the soil temperature. Therefore it increased the survival rate.This experiment result was that plastic covering treatment increased soil water content 0.5-1.5 per cent and soil temperature 1.5-6℃ and it's survival rate reached 96.92 per cent which higher than soil covered area 5.18 per cent .In order to avoiding reverse effect of plastic covering on seedling growth we ucncovered the covering before rainy season.Soil water content of Driwater afforestation higher 0.5-1.0 per cent than control's and survival rate of it reached 100 per cent which higher 11.9 per cent than control's.Driwater treatment significeantly increased the survival rate and saved water. The effect of Keeping water treatment was inconspicuousness because of large watering. So it's soil content higher 0.5 per cent than control's and survival rate only higher than control's 4.4 per cent.Seedling survival rate of rooting power treatment reached 95 per cent which higher than control's 6.9 per cent and survival of plastic covering of this treatment is 100 per cent.We found that seedling after treating with rooting powder must afforest immediatlly and containing seedling must uncover container. The result of different deep soil water content was that change of 20cm deep and 40cmdeep soil water content presented positive relationship. Soil water content of 40cm deep higher than 20cm deep 1.1 per cent, therefore it is benefit to use three years old Pinns sylvestris Linn. var. mongolica Litv seedling and transplant it deeply. Soil water content significiantlly effect met tall growth,but it no need to watering too much.