Quantification of soil nutrient levels and enzyme activities in different grassland categories in karst mountains

doi:10.11686/cyxb2019519

Abstract

Abstract: In order to explore the soil properties of different grassland categories (wild grassland, farmland reverting to grassland, forest-grass intercropping land) in karst mountains, this study focuses on the changes in soil enzyme activity and soil nutrient content of different grasslands in Guizhou province. As expected, it was found that soil enzyme activity and soil nutrient content decrease with increasing soil depth. The ranking for catalase and phosphatase activities in the three grassland categories was: forest-grass intercropping land>wild grassland>farmland reverting to grassland. The ranking for urease activity in the 0-10 cm soil layer was as for phosphatase and catalase, while urease activities in the soil layer below 10 cm ranked: forest-grass intercropping land>farmland reverting to grassland>wild grassland, and the invertase activities ranked: wild grassland>forest and grass intercropping land>farmland reverting to grassland. The protease activity ranked: forest-grass intercropping land>farmland reverting to grassland>wild grassland. The soil polyphenol oxidase activity in the three grassland categories varied. The soil nutrient levels in the forest-grass intercropping land were higher than those of wild grassland and farmland reverting to grassland. It was found that the correlation between soil nutrient levels and soil enzyme activities differed in different grassland categories, being sometimes positive and sometimes negative. In summary, with the gradual restoration of surface vegetation and associated increase in biodiversity, the soil enzyme activities and soil nutrient levels in the forest grass intercropping land were higher, and the ecological environment in the karst mountain area is shown to have been gradually improved.

Key words: karst mountains, grasslands, vegetation restoration, soil enzymes, soil nutrients

HUANG Yu-fan, SHU Ying-ge, XIAO Sheng-yang, CHEN Meng-jun. Quantification of soil nutrient levels and enzyme activities in different grassland categories in karst mountains[J]. Acta Prataculturae Sinica, 2020, 29(6): 93-104.

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