Long-term cyclic dynamics of simulated riparian forest stands

1992 ◽  
Vol 48 (3-4) ◽  
pp. 217-231 ◽  
Author(s):  
Zhi-Jun Liu ◽  
George P. Malanson
Keyword(s):  
Riparian Forest ◽  
Forest Stands ◽  
Cyclic Dynamics

Transpiration of trees and forest stands: short and long-term monitoring using sapflow methods

1996 ◽  
Vol 2 (3) ◽  
pp. 265-274 ◽  
Author(s):  
A. GRANIER ◽  
P. BIRON ◽  
N. BREDA ◽  
J.-Y. PONTAILLER ◽  
B. SAUGIER
Keyword(s):  
Forest Stands ◽  
Short And Long Term ◽  
Long Term Monitoring ◽  
Term Monitoring

scholarly journals Tree shape and form in ancient coppice woodlands

2017 ◽  
Vol 10 (2) ◽  
pp. 49-62 ◽  
Author(s):  
Petr Maděra ◽  
Tomáš Slach ◽  
Luboš Úradníček ◽  
Jan Lacina ◽  
Linda Černušáková ◽  
...  
Keyword(s):  
Tree Species ◽  
Field Survey ◽  
Scientific Literature ◽  
Forest Stands ◽  
Tree Shape ◽  
Lack Of Information ◽  
Basic Features

Abstract Ancient coppice woodlands are coppice-originated forest stands with a long-term continual development, and with the preserved typical natural and historic elements of old sprout forests. Prominent natural elements in the ancient coppice woodlands are namely old coppice stools. There is, in scientific literature, lack of information about features of ancient coppice stools. Therefore, our contribution aims to describe shape and form of ancient coppice stools, including the most important microhabitat of coppice woodlands – dendrothelms. Based on field survey of 20 localities of important coppice woodlands we recorded 135 ancient coppice stools of 13 tree species and a total of 80 dendrothelms in 9 tree species. Basic features of ancient coppice stools and dendrothlems were measured and evaluated.

Seasonal Trade-Off between Water- and Nitrogen-Use Efficiency of Constructive Plants in Desert Riparian Forest in Hyperarid Region of China

2011 ◽  
pp. 260-275
Author(s):  
Shengkui Cao ◽  
Qi Feng ◽  
Jianhua Si ◽  
Yonghong Su ◽  
Zongqiang Chang ◽  
...  
Keyword(s):  
Nitrogen Use Efficiency ◽  
Riparian Forest ◽  
Seasonal Pattern ◽  
Nitrogen Concentration ◽  
Populus Euphratica ◽  
Nitrogen Use ◽  
Trade Off ◽  
N Concentration ◽  
Use Efficiency

Foliar d13C values are often used to denote the long-term water use efficiency (WUE) of plants whereas long-term nitrogen use efficiency (NUE) are usually estimated by the ratio of C to N in the leaves. Seasonal variations of d13C values, foliar nitrogen concentration and C/N ratios of Populus euphratica and Tamarix ramosissima grown under five different microhabitats of Ejina desert riparian oasis of northwestern arid regions in China were studied. The results indicated that T. ramosissima had higher d13C value compared with that of P. euphratica. The N concentration and C/N ratios of two species were not significantly different. The seasonal pattern of three indexes in two species was different. The d13C values and N concentration decreased during the plant’s growth period. However, the change of C/N ratios was increased. Among microhabitats, there were higher d13C values and N concentration as well as lower C/N ratios in the Dune and Gobi habitats. Foliar d13C values significantly and positively correlated with N concentration in P. euphratica and T. ramosissima, whereas a significantly negative correlation between d13C values and C/N ratios was found for P. euphratica. This relation in T. ramosissima was weak, but there was a significant quadratic curve relationship between d13C values and C/N ratios, which revealed that there was a trade-off between WUE and NUE for P. euphratica and in natural condition, P. euphratica could not improve WUE and NUE simultaneously. T. ramosissima could simultaneously enhance WUE and NUE. The above characters of WUE and NUE in two plants reflected the different adaptations of desert species to environmental condition.

scholarly journals Effect of Mg fertilization on yellowing disease of Norway spruce at higher elevations of the Šumava Mts., Czech Republic

2012 ◽  
Vol 52 (No. 10) ◽  
pp. 474-481 ◽  
Author(s):  
S. Vacek ◽  
V. Podrázský ◽  
M. Hejcman ◽  
J. Remeš
Keyword(s):  
Czech Republic ◽  
Norway Spruce ◽  
Fertilizer Application ◽  
Forest Stands ◽  
Commercial Fertilizer ◽  
Mg Deficiency ◽  
Vegetation Zones ◽  
Yellowing Disease ◽  
Set Up

Norway spruce yellowing and defoliation caused by Mg deficiency was frequently recorded on many sites of the &Scaron;umava Mts. (Bohemian Forest Mts.) since 1980&rsquo;s. A forest experiment aimed at investigation response of spruce to Mg application (commercial fertilizer SILVAMIX<sup>&reg;</sup> Mg NPK) was set up in 1998. Fertilizer was applied manually in a dose of 96.5 kg Mg/ha in spruce (S) and beech-spruce (BS) vegetation altitudinal zones in spring 2000. Immediate decrease of yellowing was revealed in fertilized plots in both vegetation zones and yellowing almost completely disappeared at the end of the investigation in 2005. Further, fertilization resulted in stabile foliation while marked defoliation was reported from control plots in both vegetation zones. Mg deficiency can be effectively eliminated by appropriate fertilizer application. Balanced nutrition contributes to long-term vigour and stability of forest stands.

Modelling long-term cation supply in acidified forest stands

1993 ◽  
Vol 80 (3) ◽  
pp. 209-221 ◽  
Author(s):  
Per Warfvinge ◽  
Ursula Falkengren-Grerup ◽  
Harald Sverdrup ◽  
Bent Andersen
Keyword(s):  
Forest Stands

scholarly journals Potential impacts of tourist developments in St Lucia on the Endangered White-breasted Thrasher Ramphocinclus brachyurus

2010 ◽  
Vol 20 (4) ◽  
pp. 354-364 ◽  
Author(s):  
RICHARD P. YOUNG ◽  
TIMOTHEUS JN BAPTISTE ◽  
ALWIN DORNELLY ◽  
HELEN TEMPLE ◽  
HESTER WHITEHEAD ◽  
...  
Keyword(s):  
Riparian Forest ◽  
Distance Sampling ◽  
Tourism Industry ◽  
Dry Forest ◽  
Conservation Action ◽  
Forest Reserve ◽  
Population Responses ◽  
Development Site ◽  
Tourist Development

SummaryA rapidly developing tourism industry, concentrated in coastal regions, is suspected to seriously impact upon biodiversity in the global conservation priority of the insular Caribbean. In St Lucia, construction of tourism infrastructure in the coastal dry forest threatens the Endangered White-breasted Thrasher Ramphocinclus brachyurus. Long-term protection of habitat is vital, but design of such conservation action is constrained by lack of data on the species' distribution and population responses to habitat change and fragmentation. Distance sampling surveys were conducted in 2006 and 2007 to estimate numbers and map the distribution of the two remaining sub-populations. White-breasted Thrashers in St Lucia were estimated to number around 1,200 individuals, with roughly 1,050 birds occupying just over 600 ha of dry forest in the Mandelé area. We demonstrate that tourist development companies will likely soon own land constituting around 40% of the species' extent of occurrence on St Lucia, and nearly 35% globally, and that ongoing and planned tourist developments threaten around one third of the St Lucian White-breasted Thrasher population. Given the size of these potential impacts, it is vital that patches of dry forest to the west and north of a development site in the Mandelé area are safeguarded. These sites support White-breasted Thrashers at high density and are contiguous with an existing forest reserve. Other important conservation measures include preserving stands of connected mature dry and riparian forest inside the tourist development sites, alongside invasive predator control.

scholarly journals Improving Economic Management Decisions in Forestry with the SorSim Assortment Model

2019 ◽  
Vol 41 (1) ◽  
pp. 71-83
Author(s):  
Renato Lemm ◽  
Clemens Blattert ◽  
Stefan Holm ◽  
Leo Bont ◽  
Oliver Thees
Keyword(s):  
Optimal Allocation ◽  
Timber Harvest ◽  
Timber Harvesting ◽  
Forest Stands ◽  
Economic Management ◽  
Practical Advantage ◽  
Potential Applications ◽  
Forest Enterprises ◽  
Individual Trees

The sustainable supply of timber is one of the most important forest ecosystem services and a decisive factor determining the long-term profitability of forest enterprises. If timber production is to be economically viable, there must always be a way to analyse forest stands and trees felled for exploitation with regard to the wood assortments they contain. Only then can the expected timber yields, achieved by various silvicultural strategies or actions and different sorting options, be quantified with sufficient accuracy. The SorSim assortment simulator was developed for forest practitioners and forest scientists in Switzerland to realistically simulate the sorting of individual trees and entire forest stands based on defined specifications. SorSim has a simple user interface and comes in a number of different language versions (G, E, F). The software is implemented in Java, making it platform-independent. It can be downloaded for free at (https://www.wsl.ch/en/projects/sortimentsimulator-sorsim.html). This article provides an overview of how the simulator works and demonstrates its potential applications based on a practical and a scientific example. A particular practical advantage is that the composition of the assortments of the planned harvests can be estimated according to quantity and value. When used in strategic planning and especially in research, SorSim provides a basis for analysing either long-term developments in yields from forest stands or silvicultural treatment methods. Based on an even-aged and a selection forest stand, the scientific example shows how strongly the assessment of the advantageousness of two different silvicultural strategies depends on the time when the calculation was made (using historical and current assortment revenues and timber harvesting costs). In particular, the combination of SorSim with timber harvest productivity models enables differentiated forest economic insights. Various approaches for value-based optimisation in the sorting of individual trees and for the optimal allocation of harvesting activities to defined customer demands are currently being examined as further SorSim developments.

scholarly journals Ancient Coppice Woodlands in the Landscape of the Czech Republic

2017 ◽  
Vol 9 (4) ◽  
pp. 617-646
Author(s):  
Antonín Buček ◽  
Linda Černušáková ◽  
Michal Friedl ◽  
Martin Machala ◽  
Petr Maděra
Keyword(s):  
Czech Republic ◽  
Cultural Heritage ◽  
Animal Species ◽  
Forest Stands ◽  
The Czech Republic

Abstract Ancient coppice woodlands are forest stands of coppice origin with a long-term continual development and preserved typical natural and historic elements of old coppices. Significant natural elements in ancient coppices include polycormons of coppice shoots, pollard trees, trees with holes, dendrotelms, reserved trees, ecotones, glades and significant plant and animal species. Significant historic elements of localities with ancient coppices include archaeological monuments, boundary ditches and walls, boundary stones, boundary trees, myths and legends, sacral objects, old roads and paths, technical objects and plough land remainders. The paper presents differentiation of assumptions for the occurrence of ancient coppices in the territory of the Czech Republic using the COPF coefficient and examples of results from basic regional inventory (Kuřim region) and detailed local survey (locality Lebeďák) of coppice-originated forests. The extinction of the phenomenon of ancient coppice woodlands would mean irreparable impoverishment of the natural and cultural heritage.

Sign in / Sign up

Export Citation Format

Share Document