scholarly journals Assessment of coarse woody debris following selective logging in Caspian forests: implications for conservation and management

2013 ◽  
Vol 59 (No. 3) ◽  
pp. 117-124
Author(s):  
F.K. Behjou ◽  
O.G. Mollabashi
Keyword(s):  
Coarse Woody Debris ◽  
Forest Ecosystems ◽  
High Efficiency ◽  
Sampling Methods ◽  
Woody Debris ◽  
Forest Health ◽  
Selective Logging ◽  
Survey Method ◽  
Fuel Loading ◽  
Fixed Area

Information on the amount, distribution, and characteristics of coarse woody debris (CWD) in forest ecosystems is highly demanded by wildlife biologists, fire specialists and ecologists. Owing to its important role in wildlife habitats, fuel loading, forest productivity, and carbon sequestration, coarse woody debris is an indicator of forest health. Two sampling methods including fixed-area plot and line intersect sampling were compared for accuracy and efficiency in measuring CWD. Data were selected from mature beech stands following selective logging in Caspian forests. Line intersect sampling consistently provided estimates similar to the results of a 100% survey (high accuracy). This method also took the least amount of time and effort to map the layout and field line location (high efficiency). Finally, line intersect sampling as an easy and fast survey method is suggested to monitor coarse woody debris (CWD) in Caspian forests.  

scholarly journals Carbon Stocks of Coarse Woody Debris in Central African Tropical Forests

2018 ◽  
Vol 3 (2) ◽  
pp. 142 ◽  
Author(s):  
Romeo Ekoungoulou ◽  
Shukui Niu ◽  
Fousseni Folega ◽  
Donatien Nzala ◽  
Xiaodong Liu
Keyword(s):  
Climate Change ◽  
Carbon Storage ◽  
Tropical Forests ◽  
Reference Values ◽  
Coarse Woody Debris ◽  
Forest Ecosystems ◽  
Woody Debris ◽  
Carbon Stocks ◽  
Selective Logging ◽  
Forest Types

<p><em>Coarse </em><em>W</em><em>oody </em><em>D</em><em>ebris (CWD; defined here as fallen and standing dead trees and tree branches) is a critical-structural and functional component of forest ecosystems that typically comprises a large proportion of total aboveground carbon storage. Coarse woody debris estimation for the tropics is uncommon, and little is known about how carbon storage in CWD will respond to climate change. Given the predominant role that tropical forests play in global carbon cycling, this information gap compromises efforts to forecast climate change impacts on terrestrial carbon balance. In this study, we aimed to identify the variation in </em><em>C</em><em>oarse </em><em>W</em><em>oody </em><em>D</em><em>ebris (CWD) stocks between forest types (Old-growth and selective logging forests) and among the plots in Ipendja mixed lowland terra firme tropical rainforest (central Africa), and we examined the consequence for CWD carbon stocks estimation. The study area is located at Ipendja forest management unit (UFA), close to Dongou district (Likouala Department), in Northern Republic of Congo. Data collection were done with eight rectangular plots, each 25 x 200 m (0.5 ha). The method of line intercepts sampling has been used in each studied site. A total number of 135 CWD samples of diameter </em><em>³</em><em> 10 cm in the studied plots have been recorded. It was obvious that stock of coarse woody debris in Mokelimwaekili site (mean: 19.96 Mg ha<sup>-1</sup>; sum: 79.84 Mg ha<sup>-1</sup>) were higher than those of Sombo site (mean: 8.9 Mg ha<sup>-1</sup>; sum: 35 Mg ha<sup>-1</sup>).</em><em> </em><em>There was a significance difference in Ipendja evergreen forest about CWD stocks across two forest types and plots. </em><em>This finding suggests that values vary among forest types and that separate reference values should be adopted for estimates of undisturbed forest carbon stocks in the different ecosystems in Congo basin. Different reference values represent the variability of CWD among forest types and contribute to reducing uncertainties in current estimates of carbon stock in central African forest ecosystems.</em><em></em></p>

scholarly journals Resources of dead wood in the municipal forests in Warsaw

2015 ◽  
Vol 76 (4) ◽  
pp. 322-330 ◽  
Author(s):  
Konrad Skwarek ◽  
Szymon Bijak
Keyword(s):  
National Parks ◽  
Coarse Woody Debris ◽  
Forest Ecosystems ◽  
Dead Wood ◽  
Woody Debris ◽  
Forest Site ◽  
Natural Forests ◽  
Dead Trees ◽  
Standing Dead ◽  
High Degree

Abstract Dead wood plays an important role for the biodiversity of forest ecosystems and influences their proper development. This study assessed the amount of coarse woody debris in municipal forests in Warsaw (central Poland). Based on the forest site type, dominant tree species and age class, we stratified all complexes of the Warsaw urban forests in order to allocate 55 sample plots. For these plots, we determined the volume of dead wood including standing dead trees, coarse woody debris and broken branches as well as uprooted trees. We calculated the amount of dead wood in the distinguished site-species-age layers and for individual complexes. The volume of dead matter in municipal forests in Warsaw amounted to 38,761 m3, i.e. 13.7 m3/ha. The obtained results correspond to the current regulations concerning the amount of dead organic matter to be left in forests. Only in the Las Bielański complex (northern Warsaw) volume of dead wood is comparable to the level observed in Polish national parks or nature reserves, which is still far lower than the values found for natural forests. In general, municipal forests in Warsaw stand out positively in terms of dead wood quantity and a high degree of variation in the forms and dimensions of dead wood.

scholarly journals Automated Mapping of Woody Debris over Harvested Forest Plantations Using UAVs, High-Resolution Imagery, and Machine Learning

2019 ◽  
Vol 11 (6) ◽  
pp. 733 ◽  
Author(s):  
Lloyd Windrim ◽  
Mitch Bryson ◽  
Micheal McLean ◽  
Jeremy Randle ◽  
Christine Stone
Keyword(s):  
Machine Learning ◽  
Image Processing ◽  
High Resolution ◽  
Coarse Woody Debris ◽  
Woody Debris ◽  
Cost Effective ◽  
Small Sample ◽  
Site Quality ◽  
Survey Method ◽  
Monitoring Site

Surveying of woody debris left over from harvesting operations on managed forests is an important step in monitoring site quality, managing the extraction of residues and reconciling differences in pre-harvest inventories and actual timber yields. Traditional methods for post-harvest survey involving manual assessment of debris on the ground over small sample plots are labor-intensive, time-consuming, and do not scale well to heterogeneous landscapes. In this paper, we propose and evaluate new automated methods for the collection and interpretation of high-resolution, Unmanned Aerial Vehicle (UAV)-borne imagery over post-harvested forests for estimating quantities of fine and coarse woody debris. Using high-resolution, geo-registered color mosaics generated from UAV-borne images, we develop manual and automated processing methods for detecting, segmenting and counting both fine and coarse woody debris, including tree stumps, exploiting state-of-the-art machine learning and image processing techniques. Results are presented using imagery over a post-harvested compartment in a Pinus radiata plantation and demonstrate the capacity for both manual image annotations and automated image processing to accurately detect and quantify coarse woody debris and stumps left over after harvest, providing a cost-effective and scalable survey method for forest managers.

Coarse woody debris in Australian forest ecosystems: A review

2005 ◽  
Vol 30 (8) ◽  
pp. 834-843 ◽  
Author(s):  
GEMMA WOLDENDORP ◽  
RODNEY J. KEENAN
Keyword(s):  
Coarse Woody Debris ◽  
Forest Ecosystems ◽  
Woody Debris

Prism sweeps for coarse woody debris

2003 ◽  
Vol 33 (9) ◽  
pp. 1737-1743 ◽  
Author(s):  
Daniel P Bebber ◽  
Sean C Thomas
Keyword(s):  
Coarse Woody Debris ◽  
Statistical Power ◽  
Woody Debris ◽  
New Method ◽  
Sampling Effort ◽  
Power Calculations ◽  
Length Relationship ◽  
Area Sampling ◽  
Fixed Area ◽  
Line Intercept

A new method for sampling coarse woody debris (CWD) is presented, based on relascope sampling of CWD midpoint diameter. In this method, CWD is included in a sample if the angle subtended by the midpoint diameter viewed from plot center is greater than the critical relascope angle. The method is therefore referred to as diameter relascope sampling (DRS). Other methods for sampling CWD are reviewed and compared with DRS using sampling simulations and statistical power calculations. These are fixed area sampling, line intercept sampling, and point rela scope sampling. DRS is shown to be have greater statistical power per unit sampling effort than other methods when CWD diameter and length are linearly or allometrically related, but results can vary with the diameter-length relationship employed. The relative benefits of different methods for sampling CWD are discussed.

Concept and Classification of Coarse Woody Debris in Forest Ecosystems

2006 ◽  
Vol 1 (1) ◽  
pp. 76-84 ◽  
Author(s):  
Enrong Yan ◽  
Xihua Wang ◽  
Jianjun Huang
Keyword(s):  
Coarse Woody Debris ◽  
Forest Ecosystems ◽  
Woody Debris

scholarly journals Characterizing the Assemblage of Wood-Decay Fungi in the Forests of Northwest Arkansas

2021 ◽  
Vol 7 (4) ◽  
pp. 309
Author(s):  
Nawaf Alshammari ◽  
Fuad Ameen ◽  
Muneera D. F. AlKahtani ◽  
Steven Stephenson
Keyword(s):  
Coarse Woody Debris ◽  
Internal Transcribed Spacer ◽  
Forest Ecosystems ◽  
Woody Debris ◽  
Wood Decay ◽  
Fruiting Bodies ◽  
Decay Fungi ◽  
Wood Decay Fungi ◽  
Northwest Arkansas ◽  
Decaying Wood

The study reported herein represents an effort to characterize the wood-decay fungi associated with three study areas representative of the forest ecosystems found in northwest Arkansas. In addition to specimens collected in the field, small pieces of coarse woody debris (usually dead branches) were collected from the three study areas, returned to the laboratory, and placed in plastic incubation chambers to which water was added. Fruiting bodies of fungi appearing in these chambers over a period of several months were collected and processed in the same manner as specimens associated with decaying wood in the field. The internal transcribed spacer (ITS) ribosomal DNA region was sequenced, and these sequences were blasted against the NCBI database. A total of 320 different fungal taxa were recorded, the majority of which could be identified to species. Two hundred thirteen taxa were recorded as field collections, and 68 taxa were recorded from the incubation chambers. Thirty-nine sequences could be recorded only as unidentified taxa. Collectively, the specimens of fungi collected in the forests of northwest Arkansas belong to 64 and 128 families and genera, respectively.

Characteristics of Coarse Woody Debris in Different-Age Natural Larix gmelinii Forests in Daxing’anling Mountains

2011 ◽  
Vol 347-353 ◽  
pp. 107-111
Author(s):  
Fei Wang ◽  
Qiu Liang Zhang ◽  
Xiao Mei Li ◽  
Chun Sheng Bao ◽  
Xiao Wei Gao
Keyword(s):  
Normal Distribution ◽  
Coarse Woody Debris ◽  
Forest Ecosystems ◽  
Middle Age ◽  
Woody Debris ◽  
Structure And Function ◽  
Larix Gmelinii ◽  
Forest Age ◽  
Young Forests ◽  
And Function

Coarse woody debris (CWD) is composed of dry wood, fallen wood and large branches, and it is an important element for structure and function in forest ecosystems. In this paper, we studied the characteristics of coarse woody debris (CWD) of natural Larix gmelinii forests with different ages in Daxing’anling Mountains. The results show that (1) the CWD volumes in near-mature, middle-age and young forests are 88.55 m3•hm-2, 52.07 m3•hm-2 and 3.96 m3•hm-2, respectively; and their biomasses are 52.96 t•hm-2, 36.22 t•hm-2 and 2.35t•hm-2, respectively. Which indicate that the CWD volumes and biomasses increase with forest ages addition; (2) The CWD volume and biomass follow normal distribution in middle and near-mature forest; (3) the CWD volume and biomass decrease with forest age increasing within decay classes I and II, whereas increase in decay classes III, IVand V; (4) the volume of middle-age and young forests present a near normal distribution with decay class increasing.

Sign in / Sign up

Export Citation Format

Share Document