Research On The Soil Water Condition And Growth Characteristics Of Salix Psammophia Forest In Different Sand Of Etuoke Qian Qi

Present thesis analysis climate features of Etuoke Qian Qi, measuring on the soil water condition and discussing relationship between growth characteristics of Salix Pasmmophia Forest in different sand and soil water condition. Results indicate as follows:(1) Different site difference of soil moisture during the growing season is: fixed sand (5.85%)> the interdune lowland (5.69%)> semi-fixed dune lee slope (3.40%)> semi-fixed sandy land on the windward slope (2.89%); Overall differences in soil moisture levels in growing season are: between 0 ~ 20cm, soil moisture content decreases from the lowland, fixed sand, semi-fixed sandy windward to leeward semi-fixed sandy land; and between 40 ~ 100cm, soil moisture content decreases gradually from fixed sand dune slack, semi-fixed sandy leeward to windward slope of semi-fixed sandy land.(2) Average height of shrub Salix in four site types-- fixed sandy land, semi-fixed sandy leeward slopes, dune slacks and windward slope were 2.59m, 2.56m, 2.30m and 1.69m, respectively, branch basal diameter was 2.11cm , 1.68cm, 1.51cm and 1.07cm respectively and crown was 10.28 m~2, 10.17 m~2, 4.88 m~2 and 3.22 m~2. The relationship between Salix growth factors can be indicated as y=a+bx. The relationship between crown and branch basal diameter was the most relevant.(3) The content of Salix single cluster biomass was: fixed sandy land (20.7kg)> semi-fixed sandy leeward slope (19.1 kg)> the interdune lowland (10.4 kg)> semi-fixed sandy land on the windward slope (1.7 kg); were significant linear positive relationship exists in Salix single branch total biomass and the composite factor D~2H (D, basal diameter; H, branch height), single cluster biomass and complex factors SH.(4) The total biomass of Salix twig, branch biomass, leaf number, leaf area and soil moisture have a significant positive correlation. There was a growing trend that the growth factor in all subjects increased with soil moisture trends.(5) In the four site types, the fixed sandy land has the highest soil moisture, the best growth conditions, and it was the most suitable for the growth of Salix.