Comparative Study on Planting Tamarisk Trees after Alkalized Soil Improvement

LI Qian; LIU Songtao; LI Ming; HE Jun; SUN Zhaojun

doi:10.13522/j.cnki.ggps.2017.0178

Abstract：[Objective]Study the character changes of alkalized soil after improvement and make a comparison of the trees growth before and after planting Tamarisk trees and choose a potimal combination of amendment.[Method]The by-product of flue gas desulphurization(BFGD)and furfural residue were taken as the alkalized soil amendments,and different amendments combination for treatments,a field plot experiment was conducted to study the soil improvement effect and Tamarisk trees growth status.The three treatment were as follows:T1(BF-GD 3.0 kg/pit+furfural residue 1.0 kg/pit),T2(BFGD 2.0 kg/pit+furfural residue 2.0 kg/pit)and T3(BFGD 1.0 kg/pit+furfural residue 3.0 kg/pit).[Result]The result showed that,with the extension of planting years,the pH, total salt and alkalinity(ESP)of the alkaline soil under different treatments were decreased to different degrees. T3 treatment had a greater impact on the soil pH and total salt,the pH of 0~40 cm soil layer decreased from 8.52 to 7.85,and the total salt decreased from 3.08‰to 1.56‰after planting 2 years.T1 treatment had the most signifi-cant effect on the soil ESP,the ESP of 0~40 cm and 40~80 cm soil maximum reduction reached to 30.42% and 22.75%.By analyzing the growth index of Tamarisk trees,T1 treatment was the most conducive to the growth of Tamarisk trees,the survival rate and preservation rate were 91.66% and 83.33% respectively,which were 37.48% and 66.66% higher than that of the control;The diameter at breast height and annual branches were 2.86 cm and 20.8 cm,which were 34.91% and 30.00% higher than that of the control.[Conclusion]The combination of BF-GD and furfural residue can effectively reduce the soil pH,total salt content and ESP,which is beneficial to the growth and development of Tamarisk trees,and T1 treatment is the best combination of amendment.