in low light and high nutrient environments. To test this hypothesis, we evaluated the patterns of leaf tannin chemistry in two species of oak (Quercus velutina L. and Q. prinus L.) utilizing protein precipitation methods. Leaves were sampled from mature, forest-grown, canopy trees found in a southeastern Ohio oak-hickory forest. To evaluate the effects of environment, we sampled along a natural gradient using trees from contrasting northand south-facing slopes. To assess the patterns of variation in tannin abundance among populations, we sampled multiple trees from three different sites. Thus, data were analyzed for patterns of variation with respect to slope aspect and population. Quercus prinus trees growing on south-facing slopes had significantly greater amounts of leaf tannins than those on north-facing slopes but did not exhibit significant population differences in foliar tannin content. In contrast, Q. velutina trees on north- and south-facing slopes did not differ significantly in foliar tannin content but did exhibit significant population differences in foliar tannin content. Different species may have varying responses to the environmental stress associated with topography. Environment may have a considerable effect on leaf tannin content at the landscape scale. However, in some cases, populations may also contribute to variation and need to be considered when evaluating patterns of secondary plant metabolite distribution and/or plant-animal interactions.
{"title":"Patterns of leaf tannin variation in chestnut oak (Quercus prinus) and black oak (Quercus velutina) with respect to topography in a southeastern Ohio oak-hickory forest1","authors":"J. Reed, B. Mccarthy, J. Reed, B. Mccarthy","doi":"10.2307/2996800","DOIUrl":"https://doi.org/10.2307/2996800","url":null,"abstract":"in low light and high nutrient environments. To test this hypothesis, we evaluated the patterns of leaf tannin chemistry in two species of oak (Quercus velutina L. and Q. prinus L.) utilizing protein precipitation methods. Leaves were sampled from mature, forest-grown, canopy trees found in a southeastern Ohio oak-hickory forest. To evaluate the effects of environment, we sampled along a natural gradient using trees from contrasting northand south-facing slopes. To assess the patterns of variation in tannin abundance among populations, we sampled multiple trees from three different sites. Thus, data were analyzed for patterns of variation with respect to slope aspect and population. Quercus prinus trees growing on south-facing slopes had significantly greater amounts of leaf tannins than those on north-facing slopes but did not exhibit significant population differences in foliar tannin content. In contrast, Q. velutina trees on north- and south-facing slopes did not differ significantly in foliar tannin content but did exhibit significant population differences in foliar tannin content. Different species may have varying responses to the environmental stress associated with topography. Environment may have a considerable effect on leaf tannin content at the landscape scale. However, in some cases, populations may also contribute to variation and need to be considered when evaluating patterns of secondary plant metabolite distribution and/or plant-animal interactions.","PeriodicalId":9453,"journal":{"name":"Bulletin of the Torrey Botanical Club","volume":"123 1","pages":"243"},"PeriodicalIF":0.0,"publicationDate":"1996-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2996800","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ola Karis, R. M. King, Paul C. Janaske, D. Lellinger
{"title":"Cassini on Compositae II and III.","authors":"Ola Karis, R. M. King, Paul C. Janaske, D. Lellinger","doi":"10.2307/2996074","DOIUrl":"https://doi.org/10.2307/2996074","url":null,"abstract":"","PeriodicalId":9453,"journal":{"name":"Bulletin of the Torrey Botanical Club","volume":"123 1","pages":"167"},"PeriodicalIF":0.0,"publicationDate":"1996-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2996074","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68403007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Vegetation in Eastern North America.","authors":"S. Ware, A. Miyawaki, K. Iwatsuki, M. Grandtner","doi":"10.2307/2996077","DOIUrl":"https://doi.org/10.2307/2996077","url":null,"abstract":"","PeriodicalId":9453,"journal":{"name":"Bulletin of the Torrey Botanical Club","volume":"123 1","pages":"171"},"PeriodicalIF":0.0,"publicationDate":"1996-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2996077","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68403058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Atlas of the Orchids of Long Island, New York","authors":"E. Lamont","doi":"10.2307/2996073","DOIUrl":"https://doi.org/10.2307/2996073","url":null,"abstract":"","PeriodicalId":9453,"journal":{"name":"Bulletin of the Torrey Botanical Club","volume":"123 1","pages":"157"},"PeriodicalIF":0.0,"publicationDate":"1996-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2996073","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68402964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Dennis S. Anderson, R. B. Davis, S. C. Rooney, C. Campbell, S. C. Rooney, C. Campbell
ANDERSON, D. S., R. B. DAVIS, S. C. ROONEY, AND C. S. CAMPBELL. (Department of Plant Biology and Pathology University of Maine, Orono, ME 04469-5722). The ecology of sedges (Cyperaceae) in Maine peatlands. Bull. Torrey Bot. Club 123: 100-110. 1996.-Sedges (Cyperaceae) are the most important family of vascular plants in terms of species richness on Maine peatlands. Carex has more species than any other genus including Sphagnum in these peatlands. Optima (abundance weighted means) and tolerances (abundance weighted standard deviations) of pH, Ca, and shade are given for the 21 most frequently occurring sedge species. These species are also characterized in terms of habitat (vegetation type). Most of the species occur in the open, but a few (e.g., Carex trisperma) are most abundant in wooded habitats. Eriophorum species characterize bog and poor fen habitats. The rarest peatland sedges are all calciphiles. Canonical correspondence analysis with forward selection entered shade, pH, Al, a climate factor, K, Ca, Fe, and Mg as the minimum number of variables which best account for the species distributions. Sedge distributions within this region are determined primarily by gradients of shade and alkalinity/base cations. A comparison with other studies from boreal North American peatlands reveals that ecological requirements can differ across a sedge species' range.
{"title":"The ecology of sedges (Cyperaceae) in Maine peatlands\" 2","authors":"Dennis S. Anderson, R. B. Davis, S. C. Rooney, C. Campbell, S. C. Rooney, C. Campbell","doi":"10.2307/2996067","DOIUrl":"https://doi.org/10.2307/2996067","url":null,"abstract":"ANDERSON, D. S., R. B. DAVIS, S. C. ROONEY, AND C. S. CAMPBELL. (Department of Plant Biology and Pathology University of Maine, Orono, ME 04469-5722). The ecology of sedges (Cyperaceae) in Maine peatlands. Bull. Torrey Bot. Club 123: 100-110. 1996.-Sedges (Cyperaceae) are the most important family of vascular plants in terms of species richness on Maine peatlands. Carex has more species than any other genus including Sphagnum in these peatlands. Optima (abundance weighted means) and tolerances (abundance weighted standard deviations) of pH, Ca, and shade are given for the 21 most frequently occurring sedge species. These species are also characterized in terms of habitat (vegetation type). Most of the species occur in the open, but a few (e.g., Carex trisperma) are most abundant in wooded habitats. Eriophorum species characterize bog and poor fen habitats. The rarest peatland sedges are all calciphiles. Canonical correspondence analysis with forward selection entered shade, pH, Al, a climate factor, K, Ca, Fe, and Mg as the minimum number of variables which best account for the species distributions. Sedge distributions within this region are determined primarily by gradients of shade and alkalinity/base cations. A comparison with other studies from boreal North American peatlands reveals that ecological requirements can differ across a sedge species' range.","PeriodicalId":9453,"journal":{"name":"Bulletin of the Torrey Botanical Club","volume":"123 1","pages":"100"},"PeriodicalIF":0.0,"publicationDate":"1996-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2996067","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68402787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
plots for two years at one site and four years at the other. We analyzed differences between treatment and control in recruitment, survival, individual growth and fecundity separately. Estimates of equilibrium population growth (X) were obtained from matrix projection models to evaluate the overall competitive effects of C. maculosa on A. fecunda. Over the course of the study X was significantly higher in treatment plots compared to controls, indicating that C. maculosa had a negative effect on A. fecunda populations. Recruitment was significantly higher in treatment plots during the first two years of the study. Survival, growth and fecundity did not differ between treatment and control. These results indicate that the main effect of removing C. maculosa on populations of A. fecunda was enhanced recruitment resulting from increased seedling establishment. Competitive effects of C. maculosa on A. fecunda varied between sites and among years, indicating that long-term studies are required to fully understand the effects of competition on population dynamics.
{"title":"Competitive effects of Centaurea maculosa on the population dynamics of Arabis fecunda1","authors":"P. Lesica, J. Shelly, J. Shelly","doi":"10.2307/2996068","DOIUrl":"https://doi.org/10.2307/2996068","url":null,"abstract":"plots for two years at one site and four years at the other. We analyzed differences between treatment and control in recruitment, survival, individual growth and fecundity separately. Estimates of equilibrium population growth (X) were obtained from matrix projection models to evaluate the overall competitive effects of C. maculosa on A. fecunda. Over the course of the study X was significantly higher in treatment plots compared to controls, indicating that C. maculosa had a negative effect on A. fecunda populations. Recruitment was significantly higher in treatment plots during the first two years of the study. Survival, growth and fecundity did not differ between treatment and control. These results indicate that the main effect of removing C. maculosa on populations of A. fecunda was enhanced recruitment resulting from increased seedling establishment. Competitive effects of C. maculosa on A. fecunda varied between sites and among years, indicating that long-term studies are required to fully understand the effects of competition on population dynamics.","PeriodicalId":9453,"journal":{"name":"Bulletin of the Torrey Botanical Club","volume":"123 1","pages":"111"},"PeriodicalIF":0.0,"publicationDate":"1996-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2996068","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68402823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
BARDEN, L. S. (Department of Biology, University of North Carolina at Charlotte, Charlotte, NC 28223). The linear relation between stand yield and integrated light in a shade-adapted annual grass. Bull. Torrey Bot. Club 123: 122-125. 1996.-Many ecology textbooks state that the photosynthetic response of plants to varying light is represented by the response of single leaves, which is a downward concave curve that often reaches saturation. Single leaves of the shade-adapted, annual grass, Microstegium vimineum (Trinius) A. Camus, saturate at 25% full sunlight. However, two field experiments showed that stand dry weight yield at the end of the growing season was a linear function of integrated light, rather than a downward concave saturation-type curve. The linear relation for M. vimineum stands concurs with results of several agricultural studies and may have implications for forest growth models that assume saturation-type response curves for whole trees or forest canopies.
BARDEN, l.s.(北卡罗来纳大学夏洛特分校生物系，北卡罗来纳州夏洛特28223)。适荫一年生草林分产量与综合光照的线性关系。公牛。托里机器人。俱乐部123:122-125。1996.-许多生态学教科书指出，植物对变化光的光合响应以单叶的响应来表示，这是一条向下的凹曲线，经常达到饱和。单叶的遮荫，一年生草，Microstegium vimineum (Trinius) A. Camus，饱和在25%的充分阳光。然而，两个田间试验表明，生长季末林分干重产量与综合光照呈线性关系，而不是向下凹的饱和型曲线。葡萄分枝杆菌林分的线性关系与若干农业研究的结果一致，并可能对假设全树或森林冠层饱和型响应曲线的森林生长模型产生影响。
{"title":"The linear relation between stand yield and integrated light in a shade-adapted annual grass'","authors":"L. S. Barden","doi":"10.2307/2996069","DOIUrl":"https://doi.org/10.2307/2996069","url":null,"abstract":"BARDEN, L. S. (Department of Biology, University of North Carolina at Charlotte, Charlotte, NC 28223). The linear relation between stand yield and integrated light in a shade-adapted annual grass. Bull. Torrey Bot. Club 123: 122-125. 1996.-Many ecology textbooks state that the photosynthetic response of plants to varying light is represented by the response of single leaves, which is a downward concave curve that often reaches saturation. Single leaves of the shade-adapted, annual grass, Microstegium vimineum (Trinius) A. Camus, saturate at 25% full sunlight. However, two field experiments showed that stand dry weight yield at the end of the growing season was a linear function of integrated light, rather than a downward concave saturation-type curve. The linear relation for M. vimineum stands concurs with results of several agricultural studies and may have implications for forest growth models that assume saturation-type response curves for whole trees or forest canopies.","PeriodicalId":9453,"journal":{"name":"Bulletin of the Torrey Botanical Club","volume":"123 1","pages":"122"},"PeriodicalIF":0.0,"publicationDate":"1996-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2996069","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68402837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
SHEELEY, S. C. AND D. J. RAYNAL (College of Environmental Science and Forestry, State University of New York, Syracuse, NY 13210). The distribution and status of Vincetoxicum nigrum (L.) Moench, V. rossicum (Kleo.) Barb. and V. hirundinaria Medik. in eastern North America Bull. Torrey Bot. Club 123:148-156. 1996.Vincetoxicum nigrum (L.) Pers., (Kleo.) Barb., V. rossicum and V. hirundinaria Medik. (Asclepiadaceae) are exotic twining perennial herbs found in eastern North America. The nomenclatural status as well as the historical and current distribution of these plants were surveyed by studying floristic manuals of flora and journal literature and by examining herbarium specimens, and corresponding with authorities familiar with the species. Vincetoxicum rossicum is the most invasive of the species, often forming large colonies; it occurs from the northeastern Atlantic coast W to S Michigan and from S. Ontario to s. Pennsylvania. Vincetoxicum nigrum and V. hirduninaria appear less aggressive and have more limited patterns of distribution. Vincetoxicum nigrum occurs from the northeastern Atlantic Coast west to Missouri and Kansas and from southern Ontario to southern Pennsylvania. Vincetoxicum hirundinaria is found in southern Ontario, New York and Pennsylvania. Vincetoxicum species may persist for decades after establishment, spreading vegetatively and by means of polyembronic seeds.
(美国纽约州立大学环境科学与林业学院，纽约州锡拉丘兹13210)。长春花毒的分布与现状Moench, V. rosicum (Kleo.)倒钩。和水蛭。北美东部的牛。托里机器人。俱乐部123:148 - 156。1996.长春花(L.)珀耳斯。(Kleo。)倒钩。、蔷薇花和水仙花。是产于北美东部的外来的多年生缠绕草本植物。通过查阅植物区系手册、期刊文献、植物标本馆标本，并与熟悉该植物的权威机构联系，调查了该植物的命名现状、历史分布和现状。长春花是最具侵略性的物种，经常形成大的菌落;它发生在大西洋东北部海岸西至密歇根州南部和南安大略至宾夕法尼亚州南部。黑长春花毒菌和水蛭弧菌的侵袭性较弱，分布模式也比较有限。长在大西洋东北海岸向西至密苏里州和堪萨斯州，从安大略省南部到宾夕法尼亚州南部。在安大略南部，纽约和宾夕法尼亚州发现了长春花。长春花属植物在建立后可以持续几十年，通过营养传播和多胚种子传播。
{"title":"The distribution and status of species of Vincetoxicum in eastern North America","authors":"S. Sheeley, D. Raynal","doi":"10.2307/2996072","DOIUrl":"https://doi.org/10.2307/2996072","url":null,"abstract":"SHEELEY, S. C. AND D. J. RAYNAL (College of Environmental Science and Forestry, State University of New York, Syracuse, NY 13210). The distribution and status of Vincetoxicum nigrum (L.) Moench, V. rossicum (Kleo.) Barb. and V. hirundinaria Medik. in eastern North America Bull. Torrey Bot. Club 123:148-156. 1996.Vincetoxicum nigrum (L.) Pers., (Kleo.) Barb., V. rossicum and V. hirundinaria Medik. (Asclepiadaceae) are exotic twining perennial herbs found in eastern North America. The nomenclatural status as well as the historical and current distribution of these plants were surveyed by studying floristic manuals of flora and journal literature and by examining herbarium specimens, and corresponding with authorities familiar with the species. Vincetoxicum rossicum is the most invasive of the species, often forming large colonies; it occurs from the northeastern Atlantic coast W to S Michigan and from S. Ontario to s. Pennsylvania. Vincetoxicum nigrum and V. hirduninaria appear less aggressive and have more limited patterns of distribution. Vincetoxicum nigrum occurs from the northeastern Atlantic Coast west to Missouri and Kansas and from southern Ontario to southern Pennsylvania. Vincetoxicum hirundinaria is found in southern Ontario, New York and Pennsylvania. Vincetoxicum species may persist for decades after establishment, spreading vegetatively and by means of polyembronic seeds.","PeriodicalId":9453,"journal":{"name":"Bulletin of the Torrey Botanical Club","volume":"123 1","pages":"148-156"},"PeriodicalIF":0.0,"publicationDate":"1996-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2996072","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68402949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Australian Vegetation, Second Edition.","authors":"S. Handel, R. Groves, R. Hill","doi":"10.2307/2996076","DOIUrl":"https://doi.org/10.2307/2996076","url":null,"abstract":"","PeriodicalId":9453,"journal":{"name":"Bulletin of the Torrey Botanical Club","volume":"123 1","pages":"169"},"PeriodicalIF":0.0,"publicationDate":"1996-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2996076","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68403016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
HESSL, A. E., P. J. WEISBERG3 AND W L. BAKER (Department of Geography and Recreation, University of Wyoming, Laramie, WY 82071). Spatial variability of radial growth in the forest-tundra ecotone of Rocky Mountain National Park, Colorado. Bull. Torrey ecotone of Rocky Mountain National Park, Colorado. Bull. Torrey Bot. Club 123: 206-212. 1996.-Radial growth in trees has often been used to measure the relationship between climate and tree growth. Variation in radial growth with respect to environmental variables may indicate how trees in diverse landscapes may respond to climate change. The purpose of this study is to determine whether radial growth is spatially heterogeneous throughout the forest-tundra ecotone of Rocky Mountain National Park and whether this spatial variability can be related to environmental variables. Increment cores were taken from 5-10 of the largest trees in 59 sampling locations distributed across the forest-tundra ecotone of Rocky Mountain National Park. Mean annual ring width for 1978-1987 was measured in the laboratory. Stepwise weighted least squares linear regression was used to relate mean annual growth to 25 environmental variables measured at each sampling location. Mean radial growth is higher at sampling locations with higher soil pH values and where there is small rock material but varies with zone and associated shrub species. When all statistically significant variables are considered, radial growth is slowest in the krummholz zone, intermediate in the patch forest zone, and fastest in the closed forest zone. Within each zone, the presence of Juniperus communis indicates slow radial growth, Vaccinium spp. indicate intermediate radial growth, and Salix spp. indicate rapid radial growth. These results differ from previous studies of vertical seedling leader growth in the FTE, which found higher rates of growth in the krummholz zone. Differing rates of radial and vertical growth may reflect different settings or different responses, though both may indicate tree "success."
HESSL, A. E. P. J. WEISBERG3和W . L. BAKER(怀俄明大学地理与娱乐系，怀俄明州拉勒米，WY 82071)。科罗拉多州落基山国家公园森林-冻土带过渡带径向生长的空间变异。公牛。科罗拉多州落基山国家公园的托里过渡带。公牛。托里机器人。俱乐部123:206-212。1996.树木的径向生长常被用来衡量气候和树木生长之间的关系。径向生长随环境变量的变化可能表明不同景观中的树木如何对气候变化作出反应。本研究的目的是确定整个落基山国家公园森林-苔原过渡带的径向生长是否具有空间异质性，以及这种空间变异性是否与环境变量有关。在落基山国家公园森林-冻土带交错带的59个采样点中，从5-10棵最大的树木中提取增量岩心。在实验室测量了1978-1987年的平均年轮宽度。采用逐步加权最小二乘线性回归将平均年增长率与每个采样地点测量的25个环境变量联系起来。平均径向生长在土壤pH值较高的取样地点和有小岩石材料的取样地点较高，但因带和伴生灌木种类而异。当考虑所有统计上显著的变量时，径向生长在克鲁姆霍兹区最慢，在斑块林区居中，在封闭林区最快。在各带内，朱柏(Juniperus communis)呈缓慢径向生长，杨柳(Vaccinium)呈中等径向生长，柳(Salix)呈快速径向生长。这些结果不同于以前在FTE中对垂直苗头生长的研究，后者发现krummholz区生长速率更高。不同的径向和垂直生长速率可能反映不同的环境或不同的响应，尽管两者都可能表明树木的“成功”。
{"title":"Spatial variability of radial growth in the forest-tundra ecotone of Rocky Mountain National Park, Colorado","authors":"A. Hessl, P. Weisberg, W. Baker","doi":"10.2307/2996796","DOIUrl":"https://doi.org/10.2307/2996796","url":null,"abstract":"HESSL, A. E., P. J. WEISBERG3 AND W L. BAKER (Department of Geography and Recreation, University of Wyoming, Laramie, WY 82071). Spatial variability of radial growth in the forest-tundra ecotone of Rocky Mountain National Park, Colorado. Bull. Torrey ecotone of Rocky Mountain National Park, Colorado. Bull. Torrey Bot. Club 123: 206-212. 1996.-Radial growth in trees has often been used to measure the relationship between climate and tree growth. Variation in radial growth with respect to environmental variables may indicate how trees in diverse landscapes may respond to climate change. The purpose of this study is to determine whether radial growth is spatially heterogeneous throughout the forest-tundra ecotone of Rocky Mountain National Park and whether this spatial variability can be related to environmental variables. Increment cores were taken from 5-10 of the largest trees in 59 sampling locations distributed across the forest-tundra ecotone of Rocky Mountain National Park. Mean annual ring width for 1978-1987 was measured in the laboratory. Stepwise weighted least squares linear regression was used to relate mean annual growth to 25 environmental variables measured at each sampling location. Mean radial growth is higher at sampling locations with higher soil pH values and where there is small rock material but varies with zone and associated shrub species. When all statistically significant variables are considered, radial growth is slowest in the krummholz zone, intermediate in the patch forest zone, and fastest in the closed forest zone. Within each zone, the presence of Juniperus communis indicates slow radial growth, Vaccinium spp. indicate intermediate radial growth, and Salix spp. indicate rapid radial growth. These results differ from previous studies of vertical seedling leader growth in the FTE, which found higher rates of growth in the krummholz zone. Differing rates of radial and vertical growth may reflect different settings or different responses, though both may indicate tree \"success.\"","PeriodicalId":9453,"journal":{"name":"Bulletin of the Torrey Botanical Club","volume":"123 1","pages":"206-212"},"PeriodicalIF":0.0,"publicationDate":"1996-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2996796","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：