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
Treeline as one of the most important indicators of climate change has been extensively researched for the past years. Elucidation of past and present treeline formation can help us to understand how rising temperatures influence the treeline pattern and to predict treeline response to future climate change. On the other hand, global treeline positions have been considered to advance or retreat because of human disturbance and / or changes in local environmental factors combined with climate warming. Every natural treeline has a common convergence characteristic, namely, a limitation of tree height growth because of low temperature or other stress conditions, and this causes a gradual change to elfin or shrubby trees along an elevation gradient. Thus, elucidation of the functional differences between trees and alpine shrubs will facilitate an understanding of the alpine treeline. The spatial distribution pattern is an indicator of the selective adaption of a population to a specific environment, and it is considered to be a crucial character for describing the relative spatial location of the population. The extent to which plant individuals are aggregated can reflect the dispersal strategies of a species and determine how this species utilizes resources. The point process theory provides several statistics containing Riply忆 s K鄄
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.