Analysis of Soil Water Content of Main Afforestation Species in Western Shanxi of Loess Plateau

Soil water content change causing by vegetation construction in Loess area was more and more attracting researchers' notice.Forest water condition analysis was the basis of construction of stable vegetation structure.This paper analyzed forest water condition of the main afforestation species in western Shanxi of Loess Plateau such as Pinus tabulaeformis,Robinia pseudoacacia and Platycladus orientalis,according to the soil water characteristic curves and soil water dynamic changes.Through comparing variety plants,the Robinia pseudoacacia and its mixed forest stand have the most preventing drought abilities.Whether in wet year or in dry year,soil water content of all testing forest stand were all higher than its unavailable soil water threshold value during growing season,and forest stand could grow stable and healthy.