In Vitro Cellular & Developmental Biology – Plant, Mar 1, 1999
Summary The paper is the second of two papers about statistical considerations that researchers ... more Summary The paper is the second of two papers about statistical considerations that researchers should make while doing in vitro plant biology research. The first paper focused on aspects from developing a plan to do research through the collection of data. This paper continues with information about editing data, handling outliers, analyzing quantitative and qualitative data, comparing treatment means, preparing graphs and tables, and presenting results.
A method is presented to assess forest site quality in tropical ecosystems. The method is based o... more A method is presented to assess forest site quality in tropical ecosystems. The method is based on the rela tion between site synecological scores (enviromnental quantifiers that are developed by using vegetation and botanical infonnation) and site physiognomic charac:teristics. The relation can be used 10 identify species with good growth po tential for panicular sites and hopefully will be useful in estimaling site productivity. A test of the methodology was done with data from Costa Rica collected from February to April 1991. The data set consisted of 190 plant species in 19 plots located in the premontane moist forest, and in 62 plots located in the tropical moist foresr, premontane belt transition. Of these plant species, 81 % were trees, 14% shrubs, 2% herbs, 4% lianas. Regression mode1s were used 10 relate enviromnental quantifiers with site characteristics. The final equatioos showed good fits (Ro. s > 0.6) with low mean squared errors. The results were used 10 develop forms 10 assess site quality that cou1d be of practical use for foresten for these life zones.
Silviculture is the art, science and practice of controlling the establishment, composition, heal... more Silviculture is the art, science and practice of controlling the establishment, composition, health, quality and growth of forests to accomplish a set of management objectives. This publication offers an approach to silviculture of the forests of Quintana Roo in which mahogany (Swietenia macrophylla King), the commercially most important tree species in Latin America, is found (Whitmore 2003). We designate these forests as mahogany forests. Much silvicultural knowledge has been gained by studying and observing which practices have or have not achieved the expected results in practice. This publication functions as a road map of technologically feasible options for the management of mahogany forests. It offers suggestions on how to develop silvicultural regimens for multiple objectives that are compatible with production of multiple forest products with emphasis on wood for industrial uses. It is hoped that by combining theory with context, those responsible for managing mahogany for...
Well, as usual, we didn\u27t win. But we did get 6th place (out of 10). That might not sound too ... more Well, as usual, we didn\u27t win. But we did get 6th place (out of 10). That might not sound too good, but that\u27s the best we can recall having done
From condition classification of more than 39,000 street trees in Iowa, an analysis is presented ... more From condition classification of more than 39,000 street trees in Iowa, an analysis is presented of which species seem to be best adapted for street-tree types of environments. Species were also analyzed for change in condition with increasing size and for differences in adaption between the northwestern and southeastern halves of the state.
Tropical timber regions across the world share common problems such as degradation and poor regen... more Tropical timber regions across the world share common problems such as degradation and poor regeneration after timber harvesting. Traditional Mayan land management through slash and burn is now recognized as an effective way of renewing forest stands in multispecies tropical forests. The practice of slash and burn for forest management in Mexico has led to area regulation, which has made land value a convenient means of assessing alternative forest plans. The use of expected land value as a performance indicator shifts the manager's attention from managing a species mix to balancing financial tradeoffs between liquidation or retention of the standing biomass. Since the forest-wide residual stock is so large, land value overrides the importance of revenue from timber sales. Several forest management methods along these lines have appeared in tropical regions of Mexico over a thirty-year time span and represent a patrimonial system of forest management (PS). The gradual innovation...
Yield data for corn (eight years) and soybeans (six years) were collected and analyzed to determi... more Yield data for corn (eight years) and soybeans (six years) were collected and analyzed to determine the impacts of a hybrid poplar shelterbelt on crop production on a central Iowa farm
Most of the nation's productive forests are in nonindustrial, private ownership. To meet proj... more Most of the nation's productive forests are in nonindustrial, private ownership. To meet projected demands, timber harvests will need to increase on these lands. Iowa, which has 0.61 million hectares (ha) or approximately 1.5 million acres of commercial forestland, could benefit from capitalizing on this demand. However, the state's timber resource has been generally under-utilized. For example, Iowans have not harvested poletimber and low-grade sawlog materials from their woodlots because the market for such products has been lacking. Killing such trees to make room for better quality material involves costs that do not immediately increase net returns; thus, incentive to manage these woodlands has not been high.
Specific gravity and fiber length variation among 13 provenances of Alnus glutinosa were studied.... more Specific gravity and fiber length variation among 13 provenances of Alnus glutinosa were studied. Based on mean provenance values, specific gravity varied from 0.37 to 0.42, and fiber length varied from 0.68 mm to 1.01 mm. Single-tree maximum values were slightly higher. Analysis of variance indicated no significant differences among provenances for either trait. Patterns of variation from pith to bark and from the base to top of the tree are presented. The potential for genetic improvement of these traits is discussed.
According to the National Christmas Tree Growers Association, Christmas tree production has expan... more According to the National Christmas Tree Growers Association, Christmas tree production has expanded greatly in the last five years. More than 35.4 million trees were sold in the United States in 1987, a 25.5% increase over the previous year. Even so, nationwide the industry is beginning to suffer from overexpansion, especially in the retail lot markets. Small choose-and-cut operations are still doing well, however, and in most localities, there is a shortage of this type of tree-purchasing option.
In Vitro Cellular & Developmental Biology – Plant, Mar 1, 1999
Summary The paper is the second of two papers about statistical considerations that researchers ... more Summary The paper is the second of two papers about statistical considerations that researchers should make while doing in vitro plant biology research. The first paper focused on aspects from developing a plan to do research through the collection of data. This paper continues with information about editing data, handling outliers, analyzing quantitative and qualitative data, comparing treatment means, preparing graphs and tables, and presenting results.
A method is presented to assess forest site quality in tropical ecosystems. The method is based o... more A method is presented to assess forest site quality in tropical ecosystems. The method is based on the rela tion between site synecological scores (enviromnental quantifiers that are developed by using vegetation and botanical infonnation) and site physiognomic charac:teristics. The relation can be used 10 identify species with good growth po tential for panicular sites and hopefully will be useful in estimaling site productivity. A test of the methodology was done with data from Costa Rica collected from February to April 1991. The data set consisted of 190 plant species in 19 plots located in the premontane moist forest, and in 62 plots located in the tropical moist foresr, premontane belt transition. Of these plant species, 81 % were trees, 14% shrubs, 2% herbs, 4% lianas. Regression mode1s were used 10 relate enviromnental quantifiers with site characteristics. The final equatioos showed good fits (Ro. s > 0.6) with low mean squared errors. The results were used 10 develop forms 10 assess site quality that cou1d be of practical use for foresten for these life zones.
Silviculture is the art, science and practice of controlling the establishment, composition, heal... more Silviculture is the art, science and practice of controlling the establishment, composition, health, quality and growth of forests to accomplish a set of management objectives. This publication offers an approach to silviculture of the forests of Quintana Roo in which mahogany (Swietenia macrophylla King), the commercially most important tree species in Latin America, is found (Whitmore 2003). We designate these forests as mahogany forests. Much silvicultural knowledge has been gained by studying and observing which practices have or have not achieved the expected results in practice. This publication functions as a road map of technologically feasible options for the management of mahogany forests. It offers suggestions on how to develop silvicultural regimens for multiple objectives that are compatible with production of multiple forest products with emphasis on wood for industrial uses. It is hoped that by combining theory with context, those responsible for managing mahogany for...
Well, as usual, we didn\u27t win. But we did get 6th place (out of 10). That might not sound too ... more Well, as usual, we didn\u27t win. But we did get 6th place (out of 10). That might not sound too good, but that\u27s the best we can recall having done
From condition classification of more than 39,000 street trees in Iowa, an analysis is presented ... more From condition classification of more than 39,000 street trees in Iowa, an analysis is presented of which species seem to be best adapted for street-tree types of environments. Species were also analyzed for change in condition with increasing size and for differences in adaption between the northwestern and southeastern halves of the state.
Tropical timber regions across the world share common problems such as degradation and poor regen... more Tropical timber regions across the world share common problems such as degradation and poor regeneration after timber harvesting. Traditional Mayan land management through slash and burn is now recognized as an effective way of renewing forest stands in multispecies tropical forests. The practice of slash and burn for forest management in Mexico has led to area regulation, which has made land value a convenient means of assessing alternative forest plans. The use of expected land value as a performance indicator shifts the manager's attention from managing a species mix to balancing financial tradeoffs between liquidation or retention of the standing biomass. Since the forest-wide residual stock is so large, land value overrides the importance of revenue from timber sales. Several forest management methods along these lines have appeared in tropical regions of Mexico over a thirty-year time span and represent a patrimonial system of forest management (PS). The gradual innovation...
Yield data for corn (eight years) and soybeans (six years) were collected and analyzed to determi... more Yield data for corn (eight years) and soybeans (six years) were collected and analyzed to determine the impacts of a hybrid poplar shelterbelt on crop production on a central Iowa farm
Most of the nation's productive forests are in nonindustrial, private ownership. To meet proj... more Most of the nation's productive forests are in nonindustrial, private ownership. To meet projected demands, timber harvests will need to increase on these lands. Iowa, which has 0.61 million hectares (ha) or approximately 1.5 million acres of commercial forestland, could benefit from capitalizing on this demand. However, the state's timber resource has been generally under-utilized. For example, Iowans have not harvested poletimber and low-grade sawlog materials from their woodlots because the market for such products has been lacking. Killing such trees to make room for better quality material involves costs that do not immediately increase net returns; thus, incentive to manage these woodlands has not been high.
Specific gravity and fiber length variation among 13 provenances of Alnus glutinosa were studied.... more Specific gravity and fiber length variation among 13 provenances of Alnus glutinosa were studied. Based on mean provenance values, specific gravity varied from 0.37 to 0.42, and fiber length varied from 0.68 mm to 1.01 mm. Single-tree maximum values were slightly higher. Analysis of variance indicated no significant differences among provenances for either trait. Patterns of variation from pith to bark and from the base to top of the tree are presented. The potential for genetic improvement of these traits is discussed.
According to the National Christmas Tree Growers Association, Christmas tree production has expan... more According to the National Christmas Tree Growers Association, Christmas tree production has expanded greatly in the last five years. More than 35.4 million trees were sold in the United States in 1987, a 25.5% increase over the previous year. Even so, nationwide the industry is beginning to suffer from overexpansion, especially in the retail lot markets. Small choose-and-cut operations are still doing well, however, and in most localities, there is a shortage of this type of tree-purchasing option.
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