The forest ecosystem has a variety of natural and social service functions. It plays an important role in ecological security, biological species protection, conservation of the living environment, and realizing the sustainable development of economy and society. Based on the " Forest Ecosystem Services Assessment Standards

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The Natural Forest Protection Program ( NFPP ) , which aims at protecting ecological resources and achieving sustainable forest management, has been implemented for 10 years in Northeast China. Under the program forest ecosystems in the region have been divided into three management areas-Key conservation, General conservation and Commercial forest. Each of these three types of forest land is subject to different management measures ( protecting or logging ) .Estimating carbon storage of forest vegetation in these areas is important both for understanding the capacity of forests in the Northeast region for carbon sequestration and as an aid to assessing the effectiveness of the NFPP in meeting its goals. To address this important need, this study selected five major forest types in the Northeast forest region-larch forest, birch forest, coniferous mixed forest, broadleaved mixed forest, coniferous and broadleaved mixed forest. Each forest type was divided into four age classes-young, mid鄄aged, premature and over mature forest. Tree biomass was calculated through

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