STUDY ON THE IMPACT OF SOIL AND WATER ENVIRONMENT ON GROWTH AND STRUCTURAL INDEX OF Sonneratia alba J. Smith PLANTED IN THUA THIEN HUE PROVINCE

Abstract

Research on the impact of soil and the water environment on growth of S. alba forests in newly planted forests in Thua Thien Hue province, including studies on the growth of S. alba on different three sites; soil under the canopy of planted forests, relationship between planted forests with soil and water. Research methods arrange experiments on different sites; Determine soil and water properties under the forest canopy, analyzed the relationship of some soil and water properties with growth. Research results determine forest growth on different sites of planted forest; Comlexility and competiveness indexes of forest, wood reserves and biomass; the influence of site location on forest stability; element of the soil under the forest canopy; Relationship between water and planted forests. Relationship between planted forests and soil and water characteristics. Propose application of site research results; cultivation techniques; afforestation to protect river and coastal environments. The conclusion of the project is that site one (I) and site tơ (II) are effective, planting forest can change Al³⁺ and SO₄^2- improving the environment at the soil layer from 0 – 50 centimeters; water properties that also have the ability to improve the environment are Al³⁺, Fe²⁺ and SO₄^2-; plantation forest growth depends on the content of N, P and Al³⁺ in the soil layer from 0 - 50 centimeters; plantation growth depends on water element such as salinity %, Al³⁺, Fe²⁺, SO₄^2- content. The above issues contribute to orienting the selection of sustainable plants for afforestation in Thua Thien Hue province and other regions in Central Vietnam with similar mangrove soil conditions.