Research On The Key Techniques Of Salix Psammophila Cultivation In The Hobq Desert

Salix psammophila is one of important bushes in the Hobq Desert .It owns the qualities of drought resistance, wind-erosion resistance, sand-buried resistance, fastgrowing, sand-fixation, water and soil conservation. Salix psammophila was used as an excellent material in papermaking and artificial board due to its good fiber morphology As industrial timber it plays an important role in sand-land region Based on experiment and field investigation, the seed life, germination, seedling development, afforestation, natural rejuvenation, and cultivation for industrial use, of Salix psammophila were studied in the recent three years.The results showed that:1. Longivty of Salix psammophila seed can be prolonged through proper storage. Longivty of Salix psammophila seed exposed to outdoor condition was about 30d. Longivty of Salix psammophila seed stored under indoor condition was about 80d. And that of Salix psammophila seed stored at 10℃and -10℃was about 300 and 360 days, respectively.2. Seed germination characters of Salix psammophila were affected by several factors. Seed of Salix psammophila could not be germinating when soil moisture was below 2%.Covering with film was benefitable to water conservation in sand,and it could promote seed germination during low soil moisture. Seed germination was significantly restrained by all kinds of NaCl application. However, branches growth were stimulated by NaCl. The optimal sand thickness covering seeds was 1.0mm-4.0mm . When the sand was thicker than 7mm , seed germination would be restrained. The most suitable temperature for seed germination was 25℃.When the temperature was higher than 40℃, germination rate was reduced seriously. Same thing would happen when the temperature was lower than 10℃. Although Seed of Salix psammophila could germinate when the temperature was 5℃, it could not grow.3. The more likely to the original soil the cultivated soil for the Salix growth became, the better the Salix cuttings grow. Proper permeability of the sand soil was good to the cutting survival. Cutting seedlings of Salix psammophila grow fast for the first two year. Then, It would be growing slowly in the third years. [0]4. After correlation analysis of Salix psammophila root diameter and above-ground biomass, the following predictive model of seedlings was established. y= 28.879x-22.537 (P<0.005) Y: biomass (g) X: branch height (cm)5. Upward growth of Salix psammophila root along within the top sand was noticed in the windward slope. This was quite possibly due to the variation of soil moisture, wind erosion and temperature. Quantitative description of this process and related factors will be carried out in the future.6. Compared to CK, water-retaining agent could significantly promotes the survival rate, biomass and branch number of salix psammophila germinated in the second year (P<0.05). The survival rate and branch number germinated in the second year, treated with water-retaining agent, was increased by 61.0﹪and 70.4﹪, respectively. All four treatments put significant impacts on the growth of Salix cuttings, with fertilizer better to height growth and sand barrier more effective to stem diameter growth.