Responses of soil active organic carbon and physicochemical characteristics to different vegetation restoration models in sloping land with purple soils in Hengyang
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.
维普
万方数据