Soil erosion on the Loess Plateau is serious due to precipitation

temperature

and other natural climate constraints and thus

determination of an appropriate stand density becomes very important. In this study

we conduct a systematic research on several aspects of the existing plantation in Caijiachuan

such as stand growth status

water storage capacity of forest litter

biodiversity

and physical properties of soils. Results show that

in order to improve the growth conditions

biodiversity

and soil physical properties

the best planting density of black locust

Panus

and the mixed forest should be 1 325

1 733

and 2 089 plant/hm2

respectively

whereas by considering the water storage capacity of the forest litter

the result turns out to be 2 133

2 222

and 2356 plant/hm2

respectively.Besides

the mixed forest has the highest biodiversity index and evenness index and the nor-capillary porosity and the capacity of the water conservation of forest soil in locust forest are also the host.