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Afforestation/reforestation (or forestation) has been implemented worldwide as an effective measure towards sustainable ecosystem services and addresses global environmental problems such as climate change. The conversion of grasslands, croplands, shrublands, or bare lands to forests can dramatically alter forest water, energy, and carbon cycles and, thus, ecosystem services (e.g., carbon sequestration, soil erosion control, and water quality improvement). Large-scale afforestation/reforestation is typically driven by policies and, in turn, can also have substantial socioeconomic impacts. To enable success, forestation endeavors require novel approaches that involve a series of complex processes and interdisciplinary sciences. For example, exotic or fast-growing tree species are often used to improve soil conditions of degraded lands or maximize productivity, and it often takes a long time to understand and quantify the consequences of such practices at watershed or regional scales. Maintaining the sustainability of man-made forests is becoming increasingly challenging under a changing environment and disturbance regime changes such as wildland fires, urbanization, drought, air pollution, climate change, and socioeconomic change. Therefore, this Special Issue focuses on case studies of the drivers, dynamics, and impacts of afforestation/reforestation at regional, national, or global scales. These new studies provide an update on the scientific advances related to forestation. This information is urgently needed by land managers and policy makers to better manage forest resources in today’s rapidly changing environments.

simulation modeling --- shear strength --- stand structure --- vegetation restoration --- surface runoff --- soil and water conservation function --- soil enzymes --- riverbank --- evapotranspiration --- human activity --- afforestation --- Artemisia ordosica --- forest cover --- precipitation variation --- soil bioengineering --- base flow --- Poyang Lake Basin --- in situ calibration --- quantification --- chlorophyll fluorescence --- photoprotection --- remote sensing --- root distribution --- ecosystem model --- CASA --- afforestation ecosystem --- phenophase --- vegetation cover change --- soil characteristics --- Robinia pseudoacacia L. and Pinus tabulaeformis Carr. mixed plantations --- composted pine bark --- water-energy balance --- sediment load --- soil respiration --- energy partitioning --- soil microbial biomass --- transpiration --- net primary productivity --- spatio-temporal scales --- seedling quality --- peat moss --- fresh pine sawdust --- understory plants --- ring-porous trees --- different climatic conditions --- dye tests --- structural equation model --- Loess Plateau --- evapotranspiration (ET) --- Pinus engelmannii Carr. --- empirical statistics --- heat dissipation probes --- MODIS --- slope change ratio of cumulative quantities (SCRCQ) --- soil water balance --- LAI --- climate fluctuation --- BTOPMC model --- living brush mattress --- vegetation greening --- streamflow

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The long-term productivity of forest ecosystems depends on the cycling of nutrients. The effect of carbon dioxide fertilization on forest productivity may ultimately be limited by the rate of nutrient cycling. Contemporary and future disturbances such as climatic warming, N-deposition, deforestation, short rotation sylviculture, fire (both wild and controlled), and the invasion of exotic species all place strains on the integrity of ecosystem nutrient cycling. Global differences in climate, soils, and species make it difficult to extrapolate even a single important study worldwide. Despite advances in the understanding of nutrient cycling and carbon production in forests, many questions remain. The chapters in this volume reflect many contemporary research priorities. The thirteen studies in this volume are arranged in the following subject groups: • N and P resorption from foliage worldwide, along chronosequences and along elevation gradients; • Litter production and decomposition; • N and P stoichiometry as affected by N deposition, geographic gradients, species changes, and ecosystem restoration; • Effects of N and P addition on understory biomass, litter, and soil; • Effects of burning on soil nutrients; • Effects of N addition on soil fauna.

Research & information: general --- Biology, life sciences --- Forestry & related industries --- leaf stoichiometry --- Cyclocarya paliurus --- geographic variations --- natural populations --- climate variables --- nitrogen --- phosphorus --- N:P ratio --- soil stoichiometry --- soil nutrient --- nutrient limitations --- natural grassland --- natural forest --- soil fauna --- N addition --- soil profile --- community structure --- food resources --- poplar plantations --- experimental nitrogen addition --- understory plant growth --- plant nutrient --- nonstructural carbohydrates --- Alpine treeline --- Nitrogen --- Non-structural carbohydrates --- Phosphorus --- Potassium --- Remobilization --- Storage --- Upper limits --- nutrient resorption --- nitrogen and phosphorous --- planted forests --- climate zones --- plant functional types --- precipitation --- green leaf nutrient --- nitrogen deposition --- N and P colimitation --- leaf N:P stoichiometry --- soil N:P stoichiometry --- seasonal variations --- nutrition resorption --- ecological stoichiometry --- plant-soil feedback --- stand age --- Robinia pseudoacacia L. --- forests --- nutrients --- disturbance --- management --- diversity --- biomass --- soil properties --- experimental fires --- UV-spectroscopy analysis --- thermal infrared thermometer --- nitrogen and phosphorus addition --- understory plants --- stoichiometric ratio --- litter decomposition --- litter standing crop carbon --- conversion coefficient --- climatic factors --- Tibetan Plateau --- shrublands --- Cunninghamia lanceolata --- mixture effect --- nutrient cycling --- rhizosphere effect --- species competition

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The articles in this Special Issue cover a very wide range of topics related to the cultivation, management and use of fast-growing tree species. In addition to research on breeding and on the influence of pruning practices on the height growth of paulownia, three articles deal with the influence of site characteristics and nutrient availability on the physiology and yield security of fast-growing tree species. Another article focuses on the modeling of soil carbon in Salix plantations, while the article by Boruszewski et al. reports on potentially suitable areas for the planting of fast-growing tree species in Poland. Zitzmann and Rode examine the impact of short-rotation plantation management on phytodiversity, while Helbig et al. deal with the influence of leaf feeding on the growth of poplars and willows. Finally, Hernandez-Estrada et al. describe the dry matter loss of poplar wood chips during storage.

woody biomass crops --- bioenergy --- biodiversity --- species richness --- flora --- vascular plants --- short rotation coppices --- poplars --- willows --- feeding simulation --- defoliation --- herbivory --- short rotation coppice --- phosphatase activity --- nutrient content --- growth stages --- biomass --- willow --- Salix --- capacity --- European larch --- fast-growing trees --- plantations --- plantation area --- poplar cultivar “Hybrid 275” --- sown area --- biomass production --- life cycle assessment --- climate impact --- soil organic carbon --- genotypic difference --- CRISPR/Cas9 --- genome editing --- Populus --- INRA 717-1B4 --- pyramidal plant habitus --- leaf petiole angle --- branch angle --- nitrogen --- phosphorus --- carbon --- physiology --- F. mandshurica --- Robinia pseudoacacia L. --- photosynthetic vitality --- chlorophyll and phenol content --- nutrition supply --- dry matter yield --- land reclamation --- spring pruning --- year-long pruning --- branching --- angle diversion of sprout --- dry matter losses --- poplar wood chips --- laboratory scale --- cultivable saproxylic microbiota --- n/a --- poplar cultivar "Hybrid 275"

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The long-term productivity of forest ecosystems depends on the cycling of nutrients. The effect of carbon dioxide fertilization on forest productivity may ultimately be limited by the rate of nutrient cycling. Contemporary and future disturbances such as climatic warming, N-deposition, deforestation, short rotation sylviculture, fire (both wild and controlled), and the invasion of exotic species all place strains on the integrity of ecosystem nutrient cycling. Global differences in climate, soils, and species make it difficult to extrapolate even a single important study worldwide. Despite advances in the understanding of nutrient cycling and carbon production in forests, many questions remain. The chapters in this volume reflect many contemporary research priorities. The thirteen studies in this volume are arranged in the following subject groups: • N and P resorption from foliage worldwide, along chronosequences and along elevation gradients; • Litter production and decomposition; • N and P stoichiometry as affected by N deposition, geographic gradients, species changes, and ecosystem restoration; • Effects of N and P addition on understory biomass, litter, and soil; • Effects of burning on soil nutrients; • Effects of N addition on soil fauna.

Research & information: general --- Biology, life sciences --- Forestry & related industries --- leaf stoichiometry --- Cyclocarya paliurus --- geographic variations --- natural populations --- climate variables --- nitrogen --- phosphorus --- N:P ratio --- soil stoichiometry --- soil nutrient --- nutrient limitations --- natural grassland --- natural forest --- soil fauna --- N addition --- soil profile --- community structure --- food resources --- poplar plantations --- experimental nitrogen addition --- understory plant growth --- plant nutrient --- nonstructural carbohydrates --- Alpine treeline --- Nitrogen --- Non-structural carbohydrates --- Phosphorus --- Potassium --- Remobilization --- Storage --- Upper limits --- nutrient resorption --- nitrogen and phosphorous --- planted forests --- climate zones --- plant functional types --- precipitation --- green leaf nutrient --- nitrogen deposition --- N and P colimitation --- leaf N:P stoichiometry --- soil N:P stoichiometry --- seasonal variations --- nutrition resorption --- ecological stoichiometry --- plant-soil feedback --- stand age --- Robinia pseudoacacia L. --- forests --- nutrients --- disturbance --- management --- diversity --- biomass --- soil properties --- experimental fires --- UV-spectroscopy analysis --- thermal infrared thermometer --- nitrogen and phosphorus addition --- understory plants --- stoichiometric ratio --- litter decomposition --- litter standing crop carbon --- conversion coefficient --- climatic factors --- Tibetan Plateau --- shrublands --- Cunninghamia lanceolata --- mixture effect --- nutrient cycling --- rhizosphere effect --- species competition --- leaf stoichiometry --- Cyclocarya paliurus --- geographic variations --- natural populations --- climate variables --- nitrogen --- phosphorus --- N:P ratio --- soil stoichiometry --- soil nutrient --- nutrient limitations --- natural grassland --- natural forest --- soil fauna --- N addition --- soil profile --- community structure --- food resources --- poplar plantations --- experimental nitrogen addition --- understory plant growth --- plant nutrient --- nonstructural carbohydrates --- Alpine treeline --- Nitrogen --- Non-structural carbohydrates --- Phosphorus --- Potassium --- Remobilization --- Storage --- Upper limits --- nutrient resorption --- nitrogen and phosphorous --- planted forests --- climate zones --- plant functional types --- precipitation --- green leaf nutrient --- nitrogen deposition --- N and P colimitation --- leaf N:P stoichiometry --- soil N:P stoichiometry --- seasonal variations --- nutrition resorption --- ecological stoichiometry --- plant-soil feedback --- stand age --- Robinia pseudoacacia L. --- forests --- nutrients --- disturbance --- management --- diversity --- biomass --- soil properties --- experimental fires --- UV-spectroscopy analysis --- thermal infrared thermometer --- nitrogen and phosphorus addition --- understory plants --- stoichiometric ratio --- litter decomposition --- litter standing crop carbon --- conversion coefficient --- climatic factors --- Tibetan Plateau --- shrublands --- Cunninghamia lanceolata --- mixture effect --- nutrient cycling --- rhizosphere effect --- species competition

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As sessile organisms, plants have to cope with a multitude of natural and anthropogenic forms of stress in their environment. Due to their longevity, this is of particular significance for trees. As a consequence, trees develop an orchestra of resilience and resistance mechanisms to biotic and abiotic stresses in order to support their growth and development in a constantly changing atmospheric and pedospheric environment. The objective of this Special Issue of Forests is to summarize state-of-art knowledge and report the current progress on the processes that determine the resilience and resistance of trees from different zonobiomes as well as all forms of biotic and abiotic stress from the molecular to the whole tree level.

pure stands --- n/a --- ion relation --- Heterobasidion annosum --- salicylic acid --- antioxidant enzymes --- antioxidant activity --- Luquasorb --- intrinsic water-use efficiency --- Greece --- Pinus koraiensis Sieb. et Zucc. --- ion homeostasis --- photosynthesis --- Pinus massoniana --- Stockosorb --- water relations --- Norway spruce --- rubber tree --- hydrophilic polymers --- drought stress --- ion relationships --- Carpinus betulus --- tree rings --- N nutrition --- disturbance --- Populus simonii Carr. (poplar) --- infection --- subcellular localization --- basal area increment --- mixed stands --- photosynthetic responses --- Aleppo pine --- water potential --- elevation gradient --- living cell --- physiological response --- antioxidant enzyme activity --- ion contents --- signal network --- expression --- soil N --- GA-signaling pathway --- differentially expressed genes --- Ca2+ signal --- climate --- ecophysiology --- Robinia pseudoacacia L. --- Heterobasidion parviporum --- mid-term --- plant tolerance --- canopy conductance --- DELLA --- tapping panel dryness --- osmotic adjustment substances --- abiotic stress --- wood formation --- malondialdehyde --- salinity treatments --- organic osmolytes --- bamboo forest --- non-structural carbohydrate --- Abies alba Mill. --- tree --- salt stress --- Populus euphratica --- proline --- nutrition --- Carpinus turczaninowii --- plasma membrane Ca2+ channels --- gene regulation --- pathogen --- TCP --- forest type --- functional analysis --- Fraxinus mandshurica Rupr. --- long-term drought --- defense response --- cold stress --- silicon fertilization --- gas exchange --- Fagus sylvatica L. --- glutaredoxin --- water availability --- 24-epiBL application --- Konjac glucomannan --- leaf properties --- reactive oxygen species --- sap flow --- ?13C --- salinity --- morphological indices --- chloroplast ultrastructure --- Moso Bamboo (Phyllostachys edulis) --- drought --- soluble sugar --- molecular cloning --- starch --- growth