Close To Nature Forest Management Model On Tropical Coast Casuarina Equisetifolia Plantation

Sustainable forest management (SFM) is the main subject of Modern Forest Science and how to manage, protect and cultivate forest scientifically is a significant issue in current international forest field. State-owned forest farms, as the basic management department of SFM in China, are considered as the foundation and basis of national and regional SFM. Therefore, it is necessary to designing an appreciate management plan for basic level (state-owned forest farms) in order to forestry multiple-function and sustainable management, and even it is a significant way to develop the economic, ecological and community benefit, and it is a possible theoretical and practical path to scientific plantation management in the current global-warming background.This study illustrates the shortage of short-rotation clear cutting operation model by contrastive analysis forest multifunction on growth, carbon sequestration, naturalness, et al between pure plantation on Daodong forest farm and mixed forests on the similar site condition likes Daodong forest farm. In order to improve forest multifunction of Daodong forest farm, a series of close to nature forest transforms models were raised based on analysis of soil conditions, current dominate tree species, leading functions, et al. Combining diagnoses results of indigenous trees and mixed afforestation models by tree species relationship analyzing. These forest development types and operation methods were realized by computer language at last.(1) The status of forest resources, degree of naturalness, ability of carbon sink, and growth were analysis in order to demonstration the necessity of plantations transformation on Daodong forest farm. The results show that Casuarina equisetifolia plantations is the dominate species on Daodong forest farm, nearly 98% forest naturalness were lower than 1.5 far less than the ideal value (30) on this farm. Individual growth potential of Casuarina equisetifolia was limited by short-rotation clear cutting operation model, the height and diameter growth were degraded 15 years later. Forest volumes here were less than 75m3/hm~2 and lower than the average volume (85.88 m3/hm~2) in our country, these caused the ability of forest carbon sequestration was only 31.4t/hm~2 lower than the average forest carbon sequestration (71.5t/hm~2) in our country.(2) In order to demonstrate the feasibility of close-to-nature forest management which mainly based on tree species mixing, a series of relative analysis was taken between mixed and pure Casuarina equisetifolia forest. The results showed: Relative to even-pure forest, mixed forest had many economic and ecology advantages such as increasing the growth of height and diameter, carbon sink, improving soil condition (especially on organic matter and available N), accelerating litter decomposition and nutrient releasing, making forest structure complicated. Moverover, mixed forest can also raise the LAI and light efficiency. Indigenous tree survey was carried on for the purpose of making clear the native trees species which suitable for the sand soil site on Daodong forest farm. 62 tree species were recorded by the survey, among them Homalium hainanense, Dalbergia hainanensis, Dysoxylum binectariferum and Castanopsis hainanensis were high valueable economic species, while Calophyllum inophyllum, Hibiscus tiliaceus, Litsea glutinosa and Schefflera octophylla were ecological key species which could growth with Casuarina equisetifolia under coast protection forest.(3) A cluster analysis was taken among the 62 tree species based on soil condition, ecological and forestry characteristic. 12 tree species were selected for the later work. Taking casuarina equisetifolia and Acacia as the main species, the optimal combination for mixed afforestation between the 12 species and main species were analyzed based on the interspecies relation theory.(4) At last, the concept of forest development type (FDT) was raised and designed to support close to nature forest management on Daodong forest farm. Considering the soil condition, dominate tree species, leading functions and forest succession stage, 10 FDTs were designed and suitable stand operation methods were adopted to match the different FDTs. In order to simplify the judgment process of FDTs and operation methods on pure forest transformation, a decision module was developed based on Java 6.0, this module could improve the efficiency and reduce the mistaken on FDT designing.