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The Study on Water and Salt Distribution Law of Chinensis Soil in Jilin Province and Regulation of Technology

Author: PanXuLiang
Tutor: LiuShuXia
School: Jilin Agricultural University
Course: Environmental Engineering
Keywords: water and salt transport organic materials field evaporation saturated hydraulic conductive
CLC: S812.2
Type: Master's thesis
Year: 2011
Downloads: 66
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Abstract

This paper takes qianan in jilin province as a study area,The L. chinensis grassland soil as the research object, used field experiment, pot experiment and laboratory simulation test combined,study of the Jilin chinensis variation of soil water and salt, effect of different fertilization on soil water and salt movement growth traits of L. chinensis, salt and water movement characteristics of Leymus chinensis grassland in the conditions of water infiltration, evaporation of soil water leaching, and with peat, decomposed manure, and organic and inorganic fertilizer as a control material to study different organic materials affect on the water and salt movement, To explore the best material for water and salt regulation. Aimed at a comprehensive understanding of salt and water movement in Leymus chinensis grassland in Jilin, for the regulation of salt and water movement technology measures proposed provide the basis theory, To protect and improve the ecological environment of salinization soil and promote sustainable development of Chinensis science.The results show that under the conditions of field evaporation, water and salt shows a different distribution law. Changes in surface soil water and salt is evident particularly, indicating that surface of water and salt subject most affected of the outside.The research also found a decrease in the same layer soil water but salinity increased, indicating that in the condition of field evaporation the increase in salinity result from evaporation.The affect of different amounts of different organic materials to electrical conductivity of the leachates is not the same. When the amount of peat from 4% to 8%, the conductivity of the leachates is essentially the same, When the amount of peat is 12% the conductivity of leachatesgets maximum, With the increase of the amount of peat and then the leachates gradually decrease the electrical conductivity of liquid; with the increase of the content of Organic andinorganic compound fertilizer, the conductivity of leachates increase the first, then Reduce, And then increase, the maximum of organic and inorganic fertilizer is 20%, the minimum is 12%;Conductivity of the leachates is measured under steady state, so the electrical conductivity ofleachates gets minimum, leachingof salt is best. When addition of peat is 4% the electrical conductivity of leachates gets minimum, so the best control effect is peat.So add peat, manure and organic and inorganic compound fertilizer addition level of 8%,4% and 12% get the best effect; the best of the three is peat.Evaporation leaching experiment using peat, organic and inorganic fertilizer, manure composting as materials to control soil salinity distribution, Experiment designed three different levels of organic material, there is difference in salt between organic material with different amounts, it is gradually increased, organic and inorganic fertilizer is even more evident changes in salinity, can increase salt 3 to 5 times. This may be because the salt of organic and inorganic fertilizer is higher. It is different between before leaching and after leaching, after 12 hours add organic and inorganic fertilizer leaching the salt distribution showed increase-decrease-increase. It may be because of surface salinity in the conditions of leaching to the bottom, However, the rate of downward movement of surface salinity is greater than the rate of downward movement of the bottom salinity, so it cause the salt of the bottom increaser. Have emerged in the soil layers with soil depth reduced salt rejection and even the situation of soil saltaccumulation. This may be due to the increase in soil solution concentration caused by reduced efficiencyof greater than desalination of water to reduce leaching efficiency caused by the increase in desalination.Experiments show that with the increase of salt content and plant height, stem diameter of L. chinensis have appeared before the distribution of increased and then decreased, indicating low salt content of plant height and stem diameter of L. chinensis are promoted, the maximum value and then slowly Reduced; the salt content of chlorophyll in the experimental design are presented under the salt content increases with the description of photosynthesis of L. chinensis was not affected.

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