Study on the amelioration effect of forest litters on cohesive yellow loam soil in southern China
To study the improvement effect of litter on the cohesive yellow loam soil in south-ern China,different types of litter from four tree species,including hybrid Broussonetia pa-pyrifera,were used as test materials.A soil sample from Xinji Town,Yizheng City was used as the test soil;The decomposition and nutrient release characteristics of litter were studied using the mesh bag decomposition method;The indoor cultivation method was used to study the effect of litter decomposition on soil physicochemical properties.The results showed that the highest organic matter content was found in the branches of Cinnamomum camphora(826.8 mg/g),the highest total nitrogen(N)content was found in the branches of Osmanthus(42.54 mg/g),the highest total phosphorus(P)content was found in the bran-ches of Osmanthus(8.04 mg/g),and the highest total potassium(K)content was found in the branches of Osmanthus(93.72 mg/g).Among different types of litter,the fastest de-composition rate was seen in the leaves of hybrid B.papyrifera(1a),while the slowest de-composition rate was seen in the roots of C.camphora(2.98 a).During the decomposition process,carbon(C),N,P,and K all exhibited release states.Comparison between different tree species,the release rates of N and C differed significantly,while the differences in P and K were not significant.The correlation analysis showed that a higher N content in the same type of litter was beneficial for decomposition,while a higher C/N ratio was detrimental to litter decomposition.This study also showed that adding litter could reduce soil pH,while significantly increasing the content of organic matter,total N,alkali-hydrolyzable N,total P,available P,total K,and available K in the soil.Additionally,the addition of litter could significantly reduce soil bulk density,increase total soil porosity and field water holding ca-pacity.The decomposition rates of leaves,roots,and stems of hybrid Broussonetia were the fastest among different tree species.Therefore,the litter of hybrid Broussonetia could par-ticipate in the formation of soil aggregates faster and provide nutrients for the soil,making it suitable for application in the improvement of cohesive yellow loam soil in the south.
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