Abstract:

It is very important for regeneration and transformation of Casuarina equisetifolia protection forest and making measurements for forest management to study the soil fertility of continuously planting forest. In the study, the pure C.equisetifolia plantation of first and second generation at Dongshan, the first, second, and third generation at Hui′an were selected as the studied objects. And the properties of soil collected from those plantations were compared. The results showed as follows: (1) It made decrease on pH value and increments on hydrolytic acidity, exchangeable acidity, exchangeable H⁺, and exchangeable Al³⁺ in soil to continuously planting C. equisetifolia in coastal areas; (2)The hydrolytic N, NH₂-N, available P, available K, total C, and total N in soil were decreased by continuously planting C.equisetifolia, and those nutrition content in the surface soil were decreased more than that in the deeper layer of soil, but there was no obvious effect on slow-leased K; (3) The CEC of soil were increased by continuously planting, and this was correlated with the increment of exchangeable Ca and exchangeable Mg; (4) The activities of phosphataese, polyphenol oxidase, and peroxidase were decreased by continuously planting C. equisetifolia, however, there was no obvious change on activity of urease.

Key words: Casuarina equisetifolia, Continuously planting, Soil nutrition content, Soil enzyme activity