Subjects: Biology >> Botany >> Applied botany submitted time 2023-07-13 Cooperative journals: 《广西植物》
Abstract： In order to explore the effect of enzyme activities of plant root exudates on rhizosphere soil enzyme activities and nutrients in a karst ecosystem, the activities of β-1,4-glucosidase (βG), β-N-acetylglucosaminidase (NAG), leucine aminopeptidase (LAP), and acidic phosphatase (ACP) of fine root exudates and rhizosphere soils in four vegetation restoration stages, which are shrub-grassland, shrubland, shrub-arbor forest and arbor forest, were measured. And, their relationships were also analyzed. The results showed that the four enzyme activities of rhizosphere soils and root exudates were significantly higher in the late stage of vegetation restoration than in the early stage of vegetation restoration. The enzyme activities C:P to N:P ratios of root exudates in arbor forest were significantly higher than those of other three stages, while the two parameters of rhizosphere soils were opposite. Correlation analysis showed that the enzyme activities of root exudates were positively correlated with the corresponding soil enzyme activity. Compared with the enzyme activities of root exudates, the correlation between soil enzyme activity and related nutrients had become significantly stronger. In addition, the activities of βG, NAG and LAP in rhizosphere soils and root exudates were positively correlated with organic carbon (SOC) and total nitrogen (TN) in rhizosphere soil, while the activity of ACP in rhizosphere soils and root exudates were positively correlated with available phosphorus (AP) in rhizosphere soil. The above results indicated that vegetation restoration had a positive effect on increasing activities of root exudates and soils. The enzymes of root exudates were the indispensable supplement for soils, and it played an important role in promoting carbon, nitrogen and phosphorus nutrient cycling. It will be that the regulation of root exudates and its enzyme activities may provide a new perspective for vegetation restoration in karst ecosystem.
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