Responses of soil active organic carbon and physicochemical characteristics to different vegetation restoration models in sloping land with purple soils in Hengyang
[Objective]The objective of this study was to determine the responses of soil active organic carbon(SAOC)and soil physicochemical characteristics,elucidating the soil restoration in fertility and qual-ity under various vegetation restoration models.[Method]Soil physicochemical properties and the fractions of SAOC in the surface(0～10 cm)and subsurface(10～20 cm)layers were analyzed in five vegetation resto-ration models as follows:natural grassland(NG),tame grassland(TG),frutex and grassland(FG),frutex(FX),and arbor and frutex(AF)on sloping land with purple soils in Hengyang,South-central China.[Result]Our results showed that the soil pH in NG was significantly higher than in the other four vegeta-tion restoration models(P<0.05).Additionally,the soil bulk density in NG and FX was significantly higher than in the other three vegetation restoration models(P<0.05).The levels of soil organic carbon(SOC),alkali-hydrolyzable nitrogen(AN),and available phosphorus(AP)in TG and FG were higher compared to the other three vegetation restoration models(P<0.05).SMBC contents in TG and FG were significantly higher than in the other three restoration models(P<0.05).However,the SEOC contents,soil microbial en-tropy(qMB),and soil organic carbon activity in TG and FG were significantly lower than in the other three restoration models(P<0.05).SOC and AN were identified as the primary driving factors for the fractions of SAOC,with interactions with other soil physico-chemical factors having a collective impact on the changes in SAOC fractions.[Conclusion]The study indicated that TG(Melilotus albus—Crotalaria pal-lid)and FG(Amorpha fruticosa+Melilotus albus)were particularly effective in enhancing carbon density and SAOC content.This enhancement facilitated the recovery of available nutrients and soil function com-pared to other restoration models on sloping land with purple soils in Hengyang,South-central China.
万方数据
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