| Haloxylon ammodendron is an important plant resource which is widely distributed in the northwest desert regions of China, it plays an important role in protecting desert environment.Yet, Haloxylon ammodendron plant resources have been severely damaged and a series of ecological and environmental problems have been occured due to human factors and the continuing deterioration of the environment. In recent years, studies have showed that an appropriate amount of Na+ play a very important role in growth and drought resistance of the dry desert plants. However, using Na+ in fertilizer application to enhance the drought resistance of desert plants has not been reported. Subsequently, through the method of indoor pot experiment, a kind of Na Compound Fertilizer was successfully developed which can significantly enhance the growth of desert plants and improve their drought resistance, and has applied for national invention patent recently. Based on the work in the above, this paper taken Haloxylon ammodendron as experimental materials preliminary studied the growth of Haloxylon ammodendron that have been trained for 3 months with Na Compound Fertilizer and then transplanted into sand field for 3 months through pot method in the wild; at the same time, studied the Long-standing growth effects, physiological changes and the impact on ecological environmental of field and pot Haloxylon ammodendron which were cultivated through Na Compound Fertilizer for a year and then transplanted into sand field for six months. the following results have already achieved:1. Compared with control(without any fertilizer) and application of (NH4)2HPO4 (containing the same amount of N, P with the Na Compound Fertilizer), The plant height of Haloxylon ammodendron cultivated through Na Compound Fertilizer for three month and then transplanted into sand field for three month increased by 26% and 12% respectively, the number of branches increased by 22% and 14%, stem diameter increased by 48% and 23%, root diameter increased by 37% and 24%, grown width increased by 57% and 28%, shoot ratio increased by 18% and 18%, fresh weight increased by 130% and 74%, dry weight increased by 154% and 74%, Na+ contents in shoot increased by 45% and 38%, Na+content in root increased by 15% and 12%, K+ content in shoot has no significant difference, but K+ content in root decreased by 28% and 31%.2. Compared with control and application of (NH4)2HPO4, through Na Compound Fertilizer in pot for one year cultivated Haloxylon ammodendron's plant height increased by 43% and 16%, main root length increased by 54% and 23%, crown width increased by 53% and 20%, dry weight increased by 114% and 24%.3. Compared with control and application of (NH4)2HPO4, through Na Compound Fertilizer in pot for one year cultivated Haloxylon ammodendron after transplanted into sand field for six months, it's survival rate increased by 17% and 12%; Compared with Na Compound Fertilizer's application in field for one year cultivated Haloxylon ammodendron's survival rate, Na Compound Fertilizer's application in pot for one year cultivated Haloxylon ammodendron's survival rate increased by 11%.4. Compared with control and application of (NH4)2HPO4, Na Compound Fertilizer in pot cultivated one year Haloxylon ammodendron in the end of sand field transplanting growth period, it's plant height increased by 42% and 16%, main root length increased by 45% and 27%, crown width increased by 51% and 29%, dry weight increased by 151% and 52%. Na Compound Fertilizer's application in pot cultivated one year Haloxylon ammodendron in the one year growth period of sand field, control,application of (NH4)2HPO4 and application of Na Compound Fertilizer's actual plant height increase were 6.64,7.07 and 8.73 cm/plant respectively, main root length of the actual increase in volume were 26.04,25.97 and 34.94 cm/plant, crown of the actual increase in volume were 36.13,30 and 53.12 cm2/plant respectively, the actual increase in dry weight, respectively, are 0.85,1.22 and 2.98g/plant. Growth and drought resistance of Haloxylon ammodendron cultivated in field through application of Na Compound Fertilizer has the same effect with the method of pot cultivation.5. The integrity of root system of Haloxylon ammodendron cultivated in field by using Na Compound Fertilizer were destructed and the survival rate were lower than pot when transplanted. Na Compound Fertilizer's application in pot cultivated Haloxylon ammodendron after sand transplanting for one year,54% of Na+ fertilizer has beenabsorbed by Haloxylon ammodendron in nursery pot,27% of the Na+ left in nursery pot that can also be used to continue to promote the growth of Haloxylon ammodendron,19% of the Na+ leached in the soil outside of the nursery pot,the total amount of leached Na+ only account for 8% of the Na+ content in soil before cultivating seedings.The cultivation of Haloxylon ammodendron in pot with application of Na Compound Fertilizer have minimal harm on the environment. This method can short the recovery period, increase the survival rate, and can effectively promote plant growth, resolve the problem of the difficulty of cultivating drought seedlings in desert and the problem of low survival rate of afforestation. Haloxylon ammodendron is very important resource specie in the desert regions of our country. Recently, it have been identified that Na+ plays an important role in the drought resistance of desert species. Sand culivation experiment confirmed that appropriate concentration of Na+not only can significantly promote the growth of desert plants overlord but also improve its anti-stress capability. A great number of studieds found that Si also plays an important role in the promotion of plant growth and increase resistance of plants. In the past there has been reports about the application of Na+ could promote the growth of desert plants and increase their resistance, but the application of Si or Na and Si interacte application on the promotion of desert plant growth and enhance their resistance have rarely been studied. Therefore, studied the effection of the application of NaCl, H2SiO3 and NaCl and H2SiO3 Interacte application on Haloxylon ammodendron's growth,physiological and ecological change and resistance. the following results has already achieved:1.The application of 0.3g/kg NaCl,0.2g/kg H2Si03 or 0.3g/kg NaCl and 0.1 g/kg H2SiO3 interaction application can not only promote the growth of Haloxylon ammodendron and increase it's drought resistance, but also 0.3g/kg NaCl and 0.1 g/kg H2SiO3 interaction application can even significantly promote Haloxylon ammodendron's growth and improve its drought resistance than the single application of 0.3g/kg NaCl or 0.2g/kg H2SiO3.2.When applied with NaCl,the application of 0.3g/kg NaCl compared with control makes Haloxylon ammodendron's plant height, crown diameter, fresh weight increased by 41.9%,91% and 61.9%; the shoot diameter,the root diameter,the root length increased 40%, 38.7% and 22.6% respectively.3.When applied with H2Si03,,the application of 0.2g/kg H2Si03 compared with control makes Haloxylon ammodendron's plant height, crown diameter, fresh weight increased by 36.3%,45.4% and 26.8%; the shoot diameter,the root diameter,the root length increased 23.3%,22.6% and 20.1% respectively.4. When NaCl and H2SiO3 interaction was applied, the effect of 0.3g/kg NaCl and 0.1 g/kg H2SiO3 appliation interaction for promoting Haloxylon ammodendron's growth and enhancing it's drought resistance are significantly higher than the single application of 0.3g/kgNaCl and 0.2g/kg H2Si03 treatment; Compared with the application of 0.3g/kg NaCl, 0.3g/kg NaCl and 0.1 g/kg H2SiO3 interaction treatment makes Haloxylon ammodendron's plant height, crown diameter, fresh weight increased by 8.6%,10% and 21%; the root length increased 11.7% respectively. Compared with the application of 0.2g/kg H2Si03,0.3g/kg NaCl and 0.1 g/kg H2SiO3 interaction treatment makes Haloxylon ammodendron's height, crown diameter, fresh weight increased by 9.5%,46.8%, and 48.2% respectively; the main stem diameter, root diameter and root length increased by 16.2%,18.4% and 16.5% respectively.
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