| Jiangxi is one of the most polluted provinces in china,There are 26,600 square kilometres of land facing the threat of erosion,It accounts for 15.95%of the total land area。Severe water erosion is a constraint on the development of the local economy。In recent years,use of chemical products to prevent erosion becomes a new trend。he Polyacrylamide is accentuated by its improvement in soil structure,enhanced soil stabilization,and enhanced soil resistance,This is the prevailing plan now。In this study,polyacrylamide was introduced as the research object in the typical red soil of jiangxi province,and the experiment of indoor potted plant and artificial simulated rainfall was carried out.The soil is treated with four types of PAM(6 million,8 million,12 million and 16 million)first,with three.gradients(0g/m2,2g/m2 and 10g/m2)for each set of treatment.Based on the analysis of the effect of different PAM matching schemes on soil improvement and crop yield,this study determined the optimal allocation scheme.At the same time according to the scheme of optimal proportion of different lithology simulated rainfall experiment,red soil and sediment yield in the further analysis of the impact,so as to the southern red soil slope soil erosion prevention and control work to provide the theory basis of science.Main contributions of this work are as follows:1.Ratio of each scheme in terms of improvement of soil properties at PAM 1200-2 ratio scheme(namely the PAM molecular weight of 12 million,seems to 2 g/m2),the optimal,compared with the control group,the soil bulk density decreased by 6.63%,after the application of water stable aggregates increased by 17.9%,a 15.24%increase in the content of clay,organic matter,total phosphorus,available phosphorus,alkaline hydrolysis nitrogen indexes such as increased 15.24%,460%,100%and 460%respectively.2.The study found that soil for plant growth treated by PAM has a significant role in promoting,effect of fresh weight(four)from high to low in turn is PAM600-10,2,2 and PAM 1200 PAM800-PAM600-2,dry weight of effect(four)has high to low in turn is PAM800-2,PAM600-2,2 and PAM 1200 PAM 1600--2.Among them,the PAM 1200-2 ratio was compared to the control group,and its fresh dry weight increased by 71.62%and 12.2%respectively.3.Based on PAM on soil properties and crop growth,the influence of choosing PAM 1200-2 proportion plan was carried out on four different lithology of red soil artificial simulated rainfall test,the results found that runoff rate from big to small in turn for:quaternary red clay development,red sandstone to develop red soil slope,slope,and purple,and red soil slope shale development,development of granite red soil slope.The sand reduction rate from big to small is the red soil slope of the red soil in the red soil,the red soil slope of the purple shale,the red soil slope of the granite development,the red sandstone development of the red soil slope.In conclusion,PAM was able to improve the structure and nature of the soil and thus promote the growth of plants.the something-2 ratio was the best in the soil.This study has enriched the southern red soil,where PAM’s study of soil erosion provides the scientific rationale for improving the soil structure,maintaining soil fertiliser and promoting agricultural development. |
