Effects of Nutrient Addition and Seeding Method on Soil Aggregate Distribution and Stability of Highway Slope in Taihang Mountain
In order to define the effects of seeding method,soil organic matter and microbial content on the distribution and stability of soil aggregates in the slope of Taihang Mountain expressway under nutrient addition,by applying 9 nitrogen and phosphorus concentration ratios to 3 plant configurations of single-sowing tall fescue(G),single-sowing Medicago sativa L(Z)and mixed-sowing tall fescue+Medicago sativa L(H),after 2 months culture,the soil aggregate distribution is determined by dry sieving method,and the aggregate stability is quantitatively analyzed.The results show that:(1)mixed seeding can better increase the content of soil macro-aggregates and enhance the stability of soil aggregates than single seeding;(2)nitrogen application rate is positively correlated with organic matter content,and negatively correlated with actinomycetes and fungi contents,the amount of phosphorus application is positively correlated with the contents of actinomycetes and fungi;(3)the contents of soil organic matter,actinomycetes and fungi are positively correlated with R0.25,MWD,GMD,and negatively correlated with D;(4)organic matter is the main factor affecting the soil aggregate stability;and(5)the optimum ratio of nitrogen and phosphorus to increase the content of soil macroaggregates and enhance the stability of aggregates is N10P10.In conclusion,N10P10 is the most favorable for soil large aggregate content and stability,and should be mixed with needle-root and direct-root plants as much as possible.
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