Effects of reforestation on soil chemical properties and microbial communities in a severely degraded sub-tropical red soil region
Taking the long-term reforestation experimental base established in a severely degraded sub-tropical hilly red soil region in Taihe County of Jiangxi Province in 1991 as the object, this paper studied the changes of soil nutrients and microbial communities after 19 years reforestation of Pi-nus elliottii forest, Liquidambar formosana forest, and P. elliotti-L. formosana forest, with the naturally restored grassland as the control. The soil organic carbon content in the L. formosana and P. elliottii-L. formosana forests (15. 16±3.53 and 16.42±0. 49 g·kg-1, respectively) was significantly higher than that in the control (9.30±l.13 g·kg-1) , the soil total phosphorus content was in the order of the control (0. 30+0. 02 g·kg-1) > P. elliottii-L. formosana forest (0. 22±0. 04 g·kg-1) > L. formosana forest (0. 14±0. 01 g·kg-1) , while the soil available phosphorus content was 1. 66+0. 02 mg·kg-1 in L. formosana forest, 2.47±0. 27 mg·kg-1 in P. elliottii-L. formosana forest, and 1. 15±0. 71 mg·kg-1 in P. elliottii forest, being significantly higher than that in the control (0. 01 ±0. 00 mg·kg-1). The total amounts of soil microbes, the amount and percentage of soil bacteria, and the amount of inorganic and organic phosphate-solubilizing microbes in L. formo-sana forest and P. elliottii-L formosana forest were all significantly higher than those in P. elliottii forest and the control, while the amount and percentage of soil fungi and the percentage of soil acti-nomycetes in L. formosana forest and P. elliottii-L. formosana forest were significantly lower than those in the control. The soil organic carbon content was significantly positively correlated with the percentage of soil bactera, but negatively correlated with the percentage of soil fungi and actinomy-cetes, while the soil available phosphorus content was significantly positively correlated with the amount of organic phosphate-solubilizing microes, but not with the amount of inorganic phosphate-solubilizing microbes. It was suggested that L. formosana forest and P. elliottii-L. formosana forest could be the recommended reforestation models in sub-tropical degraded red soil region.
hilly red soil regionreforestationsoil nutrientmicrobe
国家科技期刊平台
NSTL
万方数据
维普
