Effects of nitrogen and phosphorus addition on fine root morphological characteristics and biomass of Ligustrum lucidum in coastal new reclamation area
To explore the effects of nitrogen(N)and phosphorus(P)nutrient gradients on morphological characteristics and biomass of fine root(≤2 mm)of plant surface layer(0-10 cm)in new coastal reclamation areas,Ligustrum lucidum was used as the test material and the fertilization method of ingrown soil cores(volume 196.25 cm3)was used to conduct nitrogen and phosphorus addition experiments on the soil core of the soil surface layer(0-10 cm)of L.lucidum.Suppose the fertilization gradient was 0,1,3,5,7,9,11,13,15,17,20 g per hole.The effects of N and P nutrients on the functional traits of fine roots in the soil surface were studied.The results were as follows:(1)Compared with the control,when 3 g N was applied,the length,surface area,volume,root length density,root surface area density,and biomass of fine roots increased significantly,with the increases of 62.39%,120.87%,169.97%,59.19%,106.99%and 102.75%,respectively;when 5-11 g N was applied,the above indicators gradually decreased.When the amount of N was applied greater than 11 g,no root grew.(2)When 3 g P was applied,the total length,surface area,volume,root length density,root surface area density and biomass of the root system significantly increased,with the increases of 77.37%,111.15%,147.50%,73.87%,97.88%and 98.05%.When the amount of P was applied greater than 5 g,the above indicators of fine roots gradually decreased,but there was no rootless situation.Fertilization caused significant changes in the morphological indicators and biomass of fine roots,and plants improved the ability to acquire soil nutrients by changing the structure of fine roots.Therefore,applying 3 g of N or P respectively to the surface soil 1 m away from the trunk significantly can promote the growth of fine roots of L.lucidum.
nitrogen and phosphorus additionfine root morphologybiomassLigustrum lucidumnew reclamation areaShanghai
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