Correlation between soil nutrient content and enzyme activity in Betula luminifera forests of different forest ages

doi:10.14088/j.cnki.issn0439-8114.2023.05.010

Abstract

Abstract: In order to explore the soil nutrient management and nutrient cycling of Betula luminifera forests of different forest ages, the soil of the Betula luminifera forests in the northwest of Guangxi Zhuang Autonomous Region at 3, 7, and 13 years old was used as the research object. The soil nutrient characteristics, soil enzyme activity characteristics, and the correlation between soil nutrient and soil enzyme activity were analyzed in the 0~20 cm and 20~40 cm soil layers of different forest ages. The results showed that in the 0~20 cm soil layer, the nutrient content and enzyme activity of Betula luminifera forests of different forest ages were higher than those in the 20~40 cm soil layer; as the forest age increased, except for the total phosphorus content and sucrase activity in the soil, all other indicators first decreased and then increased, reaching their maximum at 13 years old; the Betula luminifera forest showed a significant decrease in soil nutrient content and enzyme activity during the fast-growing period （7 a）. Research had shown that there was a close relationship between soil enzyme activity and soil nutrient content. Among them, the activities of catalase and urease were highly significantly positively correlated with ammonia nitrogen, available potassium, and available phosphorus in the soil, while the correlation between total phosphorus content and these four enzyme activities was relatively small. To sum up, forest age had a significant impact on the changes of soil nutrients and enzyme activities in Betula luminifera forest. With the increase of forest growth on the uptake of soil nutrients, soil fertility would decline.It was necessary to increase the input of nitrogen, phosphorus, and potassium elements through fertilization measures in the early stage of Betula luminifera forest, in order to meet the demand for soil nutrients in the fast-growing stage of Betula luminifera forest and accelerate forest growth.

Key words: Betula luminifera, forest age, soil, enzyme activity, nutrient

CLC Number:

S792

YU Chun-he, ZENG Zhu, WEI Qiu-si, LIU Shi-nan, YANG Mei. Correlation between soil nutrient content and enzyme activity in Betula luminifera forests of different forest ages[J]. HUBEI AGRICULTURAL SCIENCES, 2023, 62(5): 54-58.

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