| The conservation and sustainable management of forest resources are the focus of attention and study, the forest multi-function management can realize the rational disposition, and satisfied the diversity need of forest function for society, then improve the sustainable management. The study area is located at the Jingouling experimental forest farm, Wangqing forestry bureau, Jilin province, situated on the middle lower hill region of Changbai Mountain in Northeast China. Making use of the physical and value assessment method, which supported by geographical information system, and based on the ground sample investigation and statistical method, the effect and benefits of multi-function of the forest ecosystems were assessed, which included the landscape pattern, carbon sequestration benefits, water conservation, soil conservation, forest purifying the environment, and the value of biological diversity protection, at the same time, the multi-function decision of forest comprehensive benefit were evaluated by using analytic hierarchy process. In this paper, The main results showed that:The main landscape type was forest land, which accounts for more than 90% of the total area, and the other types occupied small part; The forest land was divided into four types according to the stand and environmental factors, namely Mixed forest, Coniferous forest, Broadleaf forest and Artificial Pure Coniferous forest. Each type was the forest ecosystem of relatively consistent internal characteristics and significant difference between each other; The complex landscape was dominated by mixed forest and supplemented by other forest types, which four types common controlled the evolution of the ecological environment. Coniferous forest were on the rise since the implementation of Natural Forest Protection Project and Planting Conifers and Protecting Broad-leaves Trees, which had an area of 38.2156 hm2 and increased to 43.2870 hm2 from 1997 to 2007; The forest landscape showed a large number of patches and large PSCV values, with the diversity index and evenness index were all below 1.0 and the fractal dimension values between 1.280 to 1.333, indicating that the forest landscape was strongly affected by human activities; The transformation trend suggested a development towards mixed coniferous and broadleaved forests, which indicated that the future change of forest landscape pattern could be simulated by this model. The conclusion would reveal an understanding of how forests change over time in response to succession, natural disturbances, and management practices such as timber harvest. These results provided supplementary benefits to the management and restoration of the forest.The total carbon storage in the forest ecosystems were 7621.8422 t and 8018.1259 t respectively in 1997 and in 2007, Middle-aged forests and nearly mature forest had a greater proportion than the forests in other age classes, so the carbon sequestration would be in a state of sustained growth and potentially huge carbon pool; The age structure of forest showed direct proportion with carbon density approximately, the average vegetation carbon density in this field were 47.54 Mg c/hm2and 50.18 Mg c/hm2 respectively in 1997 and in 2007; The forest vegetation on this farm had the annual average accumulation amount of 39.63 t C·hm-2·a-1 and the annual average accumulation rate of 0.51%; The carbon sink benefit was evaluated and the economic values were 2627.6453 million Yuan and 2764.2649 respectively in 1997 and in 2007. It meant that the measures of forest conservation, degraded forest ecosystem restoration could significantly increase the potential of forest carbon sequestration in this area.The value of the water conservation of the forest ecosystems were 17018.97 and 14820.07 ten thousand Yuan respectively in 1997 and in 2007, middle-aged forests and nearly mature forest had a greater proportion than the forests in other age classes, which as the main body; The economic value of soil conservation for forest vegetation was respectively 626.7767 and 632.1438 ten thousand Yuan in 1997 and in 2007, and showed increasing trend; The economic value of forest purifying the environment was respectively 59160.1466 ten thousand Yuan and 59704.2859 ten thousand Yuan, a net increased 544.1393 ten thousand Yuan, and showed the increasing trend; The tree growth value was used to measure the economic value of forest landscape, the estimation of the economic value of forest products was 69080.0644 ten thousand Yuan in 1997 and 75300.7186 ten thousand Yuan in 2007, a net increasing of 6220.6542 ten thousand Yuan; The value accounting of biodiversity protection from 1997 to 2007 was respectively 12595.7750 and 13457.9421 ten thousand Yuan, a net increasing of 862.1671 ten thousand Yuan,In this paper, the author used the analysis hierarchy process to determine the weight of each index, which was obvious differences, the weight of ecological indicator for 0.8218, while the economic benefits only for 0.1782. In the weights of ecological indicator, the weight of biodiversity protection index was the maximum of 0.2244. The size order of comprehensive benefit evaluation was Artificial Pure Coniferous forest<Broadleaf forest<Coniferous forest<Mixed forest. |
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