Rhizosphere Soil Properties Of Casuarina Equisetifolia Protection Forest On Coastal Sand

On the base of grasping the dynamic of studies on rhizosphere soil of trees, and aim at the total present conditions and problems existing in studing C.equisetifolia protection forest, this article put forward the importance of studing rhizosphere soil properties of C.equisetifolia, and then researching the rhizosphere soil properties of C.equisetifolia detailedly in Dongshan Chishan Protection Forest Farm of Fujian province. The main study results were as follows:1. Rhizospere soil properties in different stages of C.equisetifolia: (1). In different stages of C.equisetifolia protection forest development, the pH value in rhizosphere soil was lower than that in non-rhizosphere soil and it shows the trend of declination in both rhizosphere soil and non-rhizosphere soil; The contents of organic matter, total N and Hydrolytic N in rhizosphere soil was more than those in non-rhizosphere soil; Hydrolytic N shows the trend of declination in both rhizosphere soil and non-rhizosphere soil form half-mature stage to mature-stage; the content of total P and available P decreases from young stage to near-mature stage, and rehabilitate a little at mature stage; the content of total K and available K increases in rhizosphere soil. (2). In different stages of C.equisetifolia plantation development, the CEC, Hydrolytic acidity and exchange Mg²⁺ in rhizosphere soil were more than those in non-rhizosphere soil, except for exchange Ca²⁺ in young C.equisetifolia protection forest; the CEC of soil arrive its max in half-mature stage. (3). As for the variation of the soil enzyme activity in different stages of C.equisetifolia protection forest, phosphataese, peroxidase and polyphenol oxidase were more active in rhizosphere soil than in non-rhizosphere soil; there was no obvious change on activity of urease; during stages of C.equisetifolia forest development, the active of phosphataese shows the trend of increase in both rhizosphere soil and non-rhizosphere soil, moreover, the difference between rhizosphere soil and non-rhizosphere were more obviously; the active of polyphenol oxidase in rhizosphere soil was more than that in other stages.2. Rhizosphere soil properties of the first-planting and second-planting C.equisetifolia protection forest: The chemical properties and biochemical activities of the rhizosphere and non-rhizosphere soil were studied on the first-planting and second-planting Casuarina equisetifolia. The result showed that the...