The density effect on the growth and yield of Daemonorops margaritae plantation has been analyzed on the basis of experiment of planting density including 3 m×3 m(A), 2 m×3 m(B), 1 m×3 m(C) and 1 m×2 m (D) 4 density levels.
Therefore,at the planting,the smallest plant density of pistachio is 4 m×4 m,the filed irrigating permeated profundity can get to about 60 cm,managing the soil can mainly use shallow plowing 10~15 cm,applying fertilizer profundity about 1.28 cm.
When the four factors of density, N, P, K are in the confidence limit of 95%, the excellent cultivating pattern for high yield as well as high quality is the following: planting density is 152～153N/667m~2, N is 54～61g/N, P is 48～49g/N, K is 45～52g/N.
Average richness (S)and diversity indices(H′)per month took on the following order: chestnut-tea intercrop(S=74, H′=1.33) > pear\|tea intercrop(S=49, H′=1.24)>3 row close planting (S=31, H′=1.03)> single row planting tea gardens(S=23, H′=0.89).
The optimum cultivation method is above 10×10~4 effective tiller/667m~2,38.3~40.4cm~2 of fix planting (density), 3.0~3.3 of number of inter-cultivation, 19.3~21.5 d of seedling age and 2.7~3.0 seed per hole.
The influence of woodland soil bulk density on the growth and distribution of fine root system of main planting tree species in the Weibei Loess Plateau was investigated by means of pot culture and field survey.
Besides, runoff and sediment produced in mixed planting of apple trees and crops were 16.14-fold and 2.96-fold than those of O.
Container stecklings are more likely to increase the planting survival rate.
Therefore, it is important to consider planting densities on the hillsides with slope gradients less than 10° for reconstructing vegetation.
To improve soil quality and maintain sustainable productivity, some measures, including planting mixed conifer with hardwood, preserving residues after harvest, and adopting scientific site preparation, should be taken.