Study On The Improvement Of Coastal Saline-alkaline Land And Forestation Technology

It is a very difficult work for the improvement and afforestation in coastal saline-alkali land.This article was combined with reducing environment pollution, Promoting the use of renewable resources, exploring method of the improvement and afforestation in coastal saline-alkali land, by the means of theory and practice and take example by a large amount of research achievements at home and abroad to provide material support and technical reference for construction of ecological environment and the recycling of several calcium containing industrial wastes.The study area locates at the sets the eco and tech development of Cangzhou Herbei. The main research contents are as follows:First of all, the effection of Glomus mosseae improves the salt resistance of Trifolium riverdel and the salt tolerance by Glomus mosseae, Glomus etunicatum and the mixed fungi of them were studied. The results showed that:the infection rate of Glomus mosseae had been reduced with the gradually increasing of single salt stress; the Physiology of Glomus mosseae had been influenced seriously by salinity of 9‰; the Na+ absorption of Trifolium riverdel was increased by Glomus mosseae, most of them was gathered at the underground part thus the relative content of Na+was reduced, so the ionic equilibrium of the plant was improved; the effect of infection rate and growing by mixed fungi were better; though there were competitive relationships with different fungi, it would be complementary effect with sufficient nutrient.Secondly, the traditional theory and depth of gesso improved the soil were added,0-20 cm, 20-40 cm,40-60 cm,60-80 cm layers of 0-80 cm layers were divided and to be the designed improved layer, chemical reactions and various ions of the mixed soil column with quantitative gypsum were discussed to determined the optimal soil improvement depth. On this basis, the improvement effect of saline-alkali soil with three calcium industrial waste desulfurization gypsum, citric acid slag and fly ash were researched to propose the optimal Scheme. The results indicated that soil amelioration of Gesso to saline-alkali was mainly reflected on the replacement of alkaline ion and the generation of hard dissolved salts; improved result was bad when the improved level was shallow, while the greater number of reacted magnesium would also weaken the improvement effect and when it was deeper, so the advisable depth of gesso modified layer was 30-50 cm, considering other factors; soil PH and ESP could be reduced by fly ash, citric acid slag and desulfurization gypsum, alleviated the alkaline soil meanwhile combine with irrigation measures and must be paid attention to and the most efficiency would be expressed in 40 cm soil column.Thirdly, the comprehensive effect of desulfurization gypsum, fly ash, citric acid slag, magnetic fertilizer, biological organic fertilizer and common fertilizer to the improvement of saline-alkali land was studied. Multiple index after improved such as soil moisture content, soil bulk density, soil organic matter, soil salt and plant PHotosynthesis parameters were reduced to a few irrelevant comprehensive factors to be principal component analysis. The result showed that magnetic fertilizer> biological fertilizer>fly ash>citric acid slag>desulfurization gypsum>chemical fertilizer from the aspects of improved effect. All of desulfurization gypsum, fly ash and citric acid slag could improve soil and promote plant growth. The chemical fertilizer does not have the function of soil improvement, and extensive use of it can aggravate some harmful toxic effects of saline-alkali soil. So soil fertilization of coastal saline-alkali should be combined with improved materials, turned the waste into treasure.more magnetic fertilizer, organic fertilizer and manure should be used, while minimized the use of chemical fertilizers.Fourth, improvement of coastal saline soil and afforestation effects of 4 key afforestation technology such as rainwater harvesting project, clapboard of preventing side permeability and surface coverage technology were compared. The results indicated that with salt-isolated layer toxic effects of soil salinity on plant could be reduced to promote survival and growth of plant. Per unit area of rainfall was increased by rainwater harvesting project which had a significant impact on survival and growth of plants. The amount of soil water infiltration was increased by clapboard of preventing side permeability which was helpful for salt-leaching, and tamarix grew better.surface coverage technology had better conservation function, meanwhile it had certain compensation ability of soil total nitrogen, PHosPHorus and rapidly-available potassiumFifth, Relying on four years research, combined with the traditional fertilizer processing technology and the market demand, a new fertilizers was invented which realize the transformation of scientific and technological achievements.This new type of fertilizer referenced traditional magnetic fertilizer production process which closely around the ion exchange, magnetism, microorganism, organic matter and trace elements, thus it had double action of improving the soil and providing the effectiveness. The results showed that:unreasonable structure, lack of trace element, biological activities and fertility insufficiency were overcome by the new fertilizer on the market at present. So the fertilizer could improve soil PHysical and chemical properties, increase the soil structure group, affect the soil microbial environmental, effectively improve the plant absorption of nutrition, the fertilizer utilization ratio and crop yield which has the better benefits of economic, social and ecological.