Approach Of Seedling Nursery For Afforesting In Seashore Saline Land

Taking a badly seashore saline land in the city of Tangshan as the No.1 research object, adopting some measures, such as sowing by seedling nursery to breed seedlings, building stair-fields, diging open drains, constructing isolate layers, transplanting seedlings in carrying soil columns etc, and exploring a new technology of seedling nursery for afforesting from some aspects like the seedling nursery material allocated proportion, the choice of suitable survival tree and land preparation measures in seashore saline land.The results showed that the seedling nursery had a certain function of anti-salt. Vermiculite and pearlite had a better effect than peat in the rate of emergence, and the seedling nursery that was made by carrying soil, peat, vermiculite and pearlite in the volume ratio of 5:1:2:2 had the highest rate of emergence in 2007. In 2008, mainly because of the tree seed, the seedling nursery' rate of seedlings emergence were different, and the bond had a remarkable influence in the seedlings emergence of seedling nursery, while the seaweed fertilizer didn't have its influence.Seedling nursery' formula for seedlings' latter growth was depend on the type of seedlings, on the analysis of the height of Robinia pseudoacacia, Fraxinus americana, Ailanthus altissima and Robinia salsula , the addition of seaweed fertilizer had a significant effect on the late growth of Fraxinus americana, which was a negative correlation between the addition of seaweed fertilizer and the late growth of Fraxinus americana , but on the other three species had no significant impact. The addition of bond had a significant effect on the late growth of three tree species of Robinia pseudoacacia, Fraxinus Americana and Ailanthus altissima, and in the design level, the add volume of bond had a positive correlation with the late seedling growth, but it had on significant influence for the late growth of Robinia salsula.In addition, the seedling nursery seedlings that had a high rate of emergence transplanted into the wild stair-fields, the survival rate and the latter growth were not necessarily high, compared with other tree species, Fraxinus Americana, Robinia salsula and Ailanthus altissima had better latter growth ,which were better adapt to the outside suroundings.Through observing the dynamic situation of moisture and salinity contents of stair-fields, basically get the change rule.of moisture and salinity contents of the stair-fields. Precipitation and evaporation had main influence on the condition of the stair-fields, the precipitation is not big in April, May and October, evaporates intensely, the soil moisture content are relatively few, Soil moisture changes unstable property. The soil salinity content was high, the change fluctuation of the soil salt content was also strong, some raise and some fall. The precipitation was abundant in July and in August, the soil moisture content achieved the year season upper limit level, soil salinity content also correspondingly reduced, desalts obviously.The difference of the moisture and salinity condition of different styles of stair-fields was remarkable. The isolate layer of slag was better than the one of construction waste in anti-salt, and the stair-field with a slag layer in the shape of two stripes from south to north and one strip from east to west had the best effect in the anti-salt.The carrying soil nutrient seedling nursery could prevent transplanting seedlings from the harmful effects of salt, which made most of the transplanted seedlings survive. The carrying soil seedling nursery internal nutrient environment stair-field holard salt movement influence. Generally, when soil salinity contents of stair-fields which was moderate or in the below level, the plant in the carrying soil seedling nursery was easy to obtain a high growth quantity. But, when soil salinity content of stair-fields which are high or in the above level, the plant in the carrying soil seedling nursery would have difficulties to survive, and assumed the inverse correlation relations with the stair-field soil salt chemicals level. The height of carrying soil nutrient seedling nursery mulberry seedling, the seedling survival percentage, the conductivity and the soil moisture content as 4 variables are carried on the multiple regression analysis, which obtains the equation of motion, H=-7.532Ec + 114.816 and P=-1.841Ec + 104.272 (H is the height of seedling, Ec is conductivity, P is survival percentage).The seashore saline land seedling nursery afforested technology was a systems engineering, including the growth of seedling nursery seedlings, stair-field desalinization, the seedlings transplanted in the carring soil seedling nursery etc. The seedling transplanted in the carring soil seedling nursery was mainly to realize a preliminary afforested effect as soon as possible, the final afforested effect must depend on the seedling nursery seedling's natural growth to realize for the big tree. The stair-fields' leading role was through the nature rainfall, the artificial irrigation and draining water downplayed the soil salinity, and reduced the soil salinity to the seedling nursery seedling's coercion level. The seedling nursery seedling had no function to improve the sodium soil in early time, after treating the root system grows out of the seedling nursery, with the lapse of time, the seedling nursery seedling's function to the soil physics and chemistry nature's improvement will be getting more and more obvious.The results could provide a certain technical support for anti-salt and afforesting in Seashore Saline Land, the purpose of the test is to popularize the use of the seedling nursery for affforesting in seashore saline land.