Forestation Technique Study on Stump of Prunus armeniaca in Arid Middle Hills of Huzhu;

Experiment on cultivation with different density and stumping height of Ginkgo biloba, showed that fresh leaf weight yield was the highest when density was 100cm×40cm and stumped 50cm from the ground.

Stumped Ginkgo biloba have significant promotion on its leaf yield;leaf yield can increase by 13%;total length,numbers of long branch can be increased when stumped Ginkgo biloba is 30 cm;stump can increase flavonoids content by 17%-50%.

In order to cultivate high yield with good quality Ginkgo biloba leaf-producing plantation, coppice management of 1,2,3-year-old Dafuzhi seedling at different stump heights (or top bud pruning) were taken and some physiological and biochemical indexes and yield of Ginkgo biloba leaves were determined on May 15 and September 11.

The following conclusions were drawn on investigation of growth and tree shape at the end of the first year: (1) Coppice management could lower Gingko tree height, reduce crown height, and enlarge crown diameters and crown volumes for some treatments.

By employing nonrelativistic and four dimentional relativistic harmonic oscillator models, the effects of the interference cross section between tranverse and longitudinal photons on the nucleon spin structure function are calculated.