نتایج جستجو برای: forest dynamics

تعداد نتایج: 539268  

Journal: :Global change biology 2013
Kristina J Anderson-Teixeira Adam D Miller Jacqueline E Mohan Tara W Hudiburg Benjamin D Duval Evan H Delucia

Forest regeneration following disturbance is a key ecological process, influencing forest structure and function, species assemblages, and ecosystem-climate interactions. Climate change may alter forest recovery dynamics or even prevent recovery, triggering feedbacks to the climate system, altering regional biodiversity, and affecting the ecosystem services provided by forests. Multiple lines o...

2002
Timo Kuuluvainen

In Fennoscandia, use of the natural forest as a reference for restoration and management of forest biodiversity has been widely accepted. However, limited understanding of the structure and dynamics of the natural forest has hampered the applications of the natural variability approach. This is especially the case in areas, where the natural forests have almost totally vanished. This review was...

2009
N. Khabarov E. Moltchanova M. Obersteiner

* Corresponding author. ** This research was performed in the framework of the EC project GEO-BENE (www.geo-bene.eu), led by IIASA. Abstract – In this paper we investigate how improvements in the weather observation systems help to reduce forest fires impact on population by targeting and monitoring places where ripe fires are likely to occur. For the purposes of population impact assessment we...

Journal: :Trends in ecology & evolution 2015
Jaboury Ghazoul Zuzana Burivalova John Garcia-Ulloa Lisa A King

Forest degradation is a global environmental issue, but its definition is problematic. Difficulties include choosing appropriate reference states, timescales, thresholds, and forest values. We dispense with many such ambiguities by interpreting forest degradation through the frame of ecological resilience, and with reference to forest dynamics. Specifically, we define forest degradation as a st...

Journal: :Journal of environmental quality 2012
Shiying Tian Mohamed A Youssef R Wayne Skaggs Devendra M Amatya G M Chescheir

We present a hybrid and stand-level forest ecosystem model, DRAINMOD-FOREST, for simulating the hydrology, carbon (C) and nitrogen (N) dynamics, and tree growth for drained forest lands under common silvicultural practices. The model was developed by linking DRAINMOD, the hydrological model, and DRAINMOD-N II, the soil C and N dynamics model, to a forest growth model, which was adapted mainly f...

2016
Malcolm S. Itter Andrew O. Finley Anthony W. D'Amato Jane R. Foster John B. Bradford

1 Abstract Changes in the frequency, duration, and severity of climate extremes are forecast to occur under global climate change. The impacts of climate extremes on forest productivity and health are complicated by potential interactions with disturbance events and forest stand dynamics. Such interactions may lead to non-linear forest growth responses to climate and disturbance involving thres...

Journal: :international journal of advanced biological and biomedical research 2013
yousef askari elmira kafash saei sehar delpasand dorna rezaei

spatial pattern of trees can possibly indicate stand history, population dynamics, and species competition. this research was investigated in the chahartagh forest reserve, ardal region, chaharmehal and bakhtiari province, central zagros forest, and southwest iranian state. in this study 53 hectare of the study area was selected and perfect inventory.  information includes the position and kind...

2014
WILLIAM F. LAURANCE ANA S. ANDRADE AINHOA MAGRACH JOSÉ L. C. CAMARGO MASON CAMPBELL PHILIP M. FEARNSIDE WILL EDWARDS JEFFERSON J. VALSKO THOMAS E. LOVEJOY SUSAN G. LAURANCE

Many contemporary ecosystems are likely to be affected by multiple environmental drivers, complicating efforts to predict future changes in those ecosystems. We studied long-term changes (1980–2012) in forest dynamics and liana (woody vine) abundance and biomass in fragmented and intact forests of the central Amazon. We did so by contrasting trends in 33 permanent 1-ha plots near forest edges (...

Journal: :Remote Sensing 2016
Xiaoyi Wang Huabing Huang Peng Gong Gregory S. Biging Qinchuan Xin Yanlei Chen Jun Yang Caixia Liu

Continuous monitoring of forest cover condition is key to understanding the carbon dynamics of forest ecosystems. This paper addresses how to integrate single-year airborne LiDAR and time-series Landsat imagery to derive forest cover change information. LiDAR data were used to extract forest cover at the sub-pixel level of Landsat for a single year, and the Landtrendr algorithm was applied to L...

Journal: :Environmental Modelling and Software 2015
Jean F. Liénard Dominique Gravel Nikolay S. Strigul

Forest dynamics are highly dimensional phenomena that are not fully understood theoretically. Forest inventory datasets offer unprecedented opportunities to model these dynamics, but they are analytically challenging due to high dimensionality and sampling irregularities across years. We develop a data-intensive methodology for predicting forest stand dynamics using such datasets. Our methodolo...

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