Analysis of sampling methods for coarse woody debris

Woldendorp, G.; Keenan, Rodney J.; Barry, Simon C.; Spencer, R. D.

doi:10.1016/j.foreco.2004.03.042

Cited by 124 publications

(120 citation statements)

References 12 publications

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“…It has been shown in various studies/simulations that longer transect lengths increase CWD estimation precision (Pickford and Hazard, 1978;Harmon and Sexton, 1996;Woldendorp et al, 2004); however, this does not resolve the national inventory issue as to whether gains in the precision of population level estimates is worth the sacrifice in plot-level estimate precision with more numerous but shorter transects. As found in one simulation study (Williams, personal communication, 2005, mathematical statistician, USDA Forest Service, Rocky Mountain Research Station, Ft. Collins, CO), although increasing transect lengths on individual plots may reduce sampling error, sampling DDW on shorter transects on more plots may better estimate DDW attributes at large scales.…”

Section: Challenges and Opportunities For Improving A National Ddw C mentioning

confidence: 99%

National inventories of down and dead woody material forest carbon stocks in the United States: Challenges and opportunities

Woodall

Heath

Smith

2008

Forest Ecology and Management

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Section: Challenges and Opportunities For Improving A National Ddw C mentioning

confidence: 99%

National inventories of down and dead woody material forest carbon stocks in the United States: Challenges and opportunities

Woodall

Heath

Smith

2008

Forest Ecology and Management

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“…Because deadwood surveys have most often been developed for local conditions (Woldendorp et al 2004, Travaglini et al 2006, NFIs have adopted different definitions and inventorying methods. The result is that deadwood estimates are generally not comparable for different countries.…”

Section: Eadwood Is Acknowledged To Be a Criticalmentioning

confidence: 99%

Assessing Deadwood Using Harmonized National Forest Inventory Data

Rondeux¹,

Bertini²,

Bastrup-Birk³

et al. 2012

Forest Science

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Abstract:Deadwood plays an important role in forest ecological processes and is fundamental for the maintenance of biological diversity. Further, it is a forest carbon pool whose assessment must be reported for international agreements dealing with protection and forest management sustainability. Despite wide agreement on deadwood monitoring by national forest inventories (NFIs), much work is still necessary to clarify definitions so that estimates can be directly compared or aggregated for international reporting. There is an urgent need for an international consensus on definitions and agreement on harmonization methods. The study addresses two main objectives: to analyze the feasibility of harmonization procedures for deadwood estimates and to evaluate the impact of the harmonization process based on different definitions on final deadwood estimates. Results are reported for an experimental harmonization test using NFI deadwood data from 9,208 sample plots measured in nine European countries and the United States. Harmonization methods were investigated for volume by spatial position (lying or standing), decay classes, and woody species accompanied by accuracy assessments. Estimates of mean plot volume based on harmonized definitions with minimum length/height of 1 m and minimum diameter thresholds of 10, 12, and 20 cm were on average 3, 8, and 30% smaller, respectively, than estimates based on national definitions. Volume differences were less when estimated for various deadwood categories. An accuracy assessment demonstrated that, on average, the harmonization procedures did not substantially alter deadwood observations (root mean square error 23.17%). FOR. SCI. 58(3):269 -283.

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“…4 -Log volume in disturbed and undisturbed stands in NW Russia. Estimated log volume in undisturbed stands and in stands after windthrow disturbance in NW Russia rch objectives and resources (e.g., Woldendorp et al 2004). There is also disagreement regarding the definition of the different CWD components.…”

Section: Discussionmentioning

confidence: 99%

Amount and distribution of coarse woody debris in pine ecosystems of north-western Spain, Russia and the United States

Herrero¹,

Krankina²,

Monleón³

et al. 2014

iForest

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© iForest -Biogeosciences and Forestry IntroductionCoarse woody debris (CWD) is one of the most important functional and structural components of forest ecosystems (Harmon et al. 1986, McComn & Lindenmayer 1999. CWD affects nutrient cycling, carbon storage and hydrological processes. It also serves as an essential substrate for a multitude of species, including numerous rare and endangered species (von Oheimb et al. 2007).Numerous studies have examined the role of CWD in maintaining biodiversity (Esseen et al. 1997, Angelstam 1998, estimating the decomposition rates of many important tree species (Yatskov et al. 2003), evaluating the effect of CWD in carbon and nutrient cycles (Krankina et al. 1999, Hyvonenn et al. 2000, Merganicôvá & Merganic 2010 and analyzing the quantity, structure and dynamics of CWD in managed and unmanaged forests (Green & Peterken 1997, Linder et al. 1997, Siitonen et al. 2000, Lombardi et al. 2008. In unmanaged forests, the amount of CWD is the result of tree mortality and dead wood decay rates, both of which are affected by climate, site productivity, tree species composition, disturbance regime, previous forest stand characteristics and the successional stage of the forest (Harmon et al. 1986, Spies et al. 1988. In managed forests, CWD quantities are typically kept very low, to avoid pest problems and fire hazards and to maximize the commercial value of the harvest. Where economics and accessibility allow, trees affected by insects, diseases, and fire are usually removed immediately, before they die or deteriorate (DeBell et al. 1997, Green & Peterken 1997. Plantation forests are typically managed on short rotations and are generally subject to intensive harvesting methods, resulting in structurally homogenous stands without significant amounts of CWD (Harmon et al. 1986, deMaynadier & Hunter 1995. However, silvicultural activities such as thinning, pruning and harvesting can create woody debris (Carlyle 1995). The increasing importance of biodiversity and carbon storage favors the maintenance and promotion of CWD in managed forests. Leaving some live and dead trees during logging operations, or even killing trees to create CWD, are some of the operational means for meeting biodiversity needs in managed forests (Esseen et al. 1997).The amount and distribution of CWD can be a criterion for assessing and determining baseline silvicultural practices. This type of data is available for different types of forests, but the geographic extent and focus of most studies is limited to one or a few specific stands. There is very little information on continental or global CWD quantities and distribution patterns or on how management affects these patterns. Comparison of different forest ecosystems makes it possible to examine the effects of site productivity and stand structure on CWD amounts and decomposition rates. It also improves understanding of how different management practices affect CWD as a resource, which is vital to formulating guidelines and strategies for increasing carbon storage ...

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Analysis of sampling methods for coarse woody debris

Cited by 124 publications

References 12 publications

National inventories of down and dead woody material forest carbon stocks in the United States: Challenges and opportunities

National inventories of down and dead woody material forest carbon stocks in the United States: Challenges and opportunities

Assessing Deadwood Using Harmonized National Forest Inventory Data

Amount and distribution of coarse woody debris in pine ecosystems of north-western Spain, Russia and the United States

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