Bulletin of the Torrey Botanical Club最新文献_第2页

Stem and Leaf Anatomy of Saruma henryi Oliv., Including Observations on Raylessness in the Aristolochiaceae 山榄茎叶解剖。，包括马兜铃科植物无光性的观察

Bulletin of the Torrey Botanical Club Pub Date : 1996-10-01 DOI: 10.2307/2996773

W. Dickison

引用次数: 18

Composition, structure, and disturbance history of Crabtree Woods: an old-growth forest of western Maryland' Crabtree Woods的组成、结构和扰动史:马里兰州西部的一个古老森林

Bulletin of the Torrey Botanical Club Pub Date : 1996-10-01 DOI: 10.2307/2996783

B. Mccarthy, D. Bailey, D. Bailey

{"title":"Composition, structure, and disturbance history of Crabtree Woods: an old-growth forest of western Maryland'","authors":"B. Mccarthy, D. Bailey, D. Bailey","doi":"10.2307/2996783","DOIUrl":"https://doi.org/10.2307/2996783","url":null,"abstract":"MCCARTHY, B. C. AND D. R. BAILEY. (Department of Environmental & Plant Biology, Ohio University, Athens, OH 45701-2979). Composition, structure, and disturbance history of Crabtree Woods: an old-growth forest of western Maryland. Bull. Torrey Bot. Club 123: 350-365. 1996.-Crabtree Woods is an old stand of mixed Appalachian hardwoods which has been identified as one of the finest examples of this vegetation type in Maryland. Because few botanical studies have been conducted on the Allegheny Plateau of Maryland and because the old-growth nature of this stand is unique in its present landscape, we undertook this study to describe the composition, structure, and disturbance history of the stand. A one hectare permanent plot was established in which all trees, saplings, snags, and logs were quantified. Woody seedlings and herbs were subsampled from 25 quadrats to describe the understory. Increment cores were obtained from all Quercus rubra trees within the plot and used for dendroecological analysis. The stand shows many structural and compositional features characteristic of old-growth forest. The overstory was dominated by Acer saccharum, Q. rubra, and Tilia americana. The stand exhibited a reverse-J diameter distribution typical of old forests and a number of trees were observed to have a diameter >100 cm DBH. Acer saccharum and Hamamelis virginiana were the prominent understory constituents. Quercus rubra was essentially absent from seedling and sapling size classes and does not appear to be regenerating. Logs and snags were abundant and occurred in a variety of decay states and diameter classes. Thirty-nine species of herbs were discovered, with Dicentra canadensis, Urtica dioica, and Impatiens pallida being the most abundant. Stem increment analysis shows multiple periods of recruitment likely associated with gap dynamics. However, certain synchronous releases suggest possible light anthropogenic disturbance (e.g., selective cutting or chestnut salvage).","PeriodicalId":9453,"journal":{"name":"Bulletin of the Torrey Botanical Club","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2996783","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411553","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}

引用次数: 59

Effects of Fire Frequency on Plant Species in Oak Savanna in East-Central Minnesota 火灾频率对明尼苏达州中东部栎树草原植物种类的影响

Bulletin of the Torrey Botanical Club Pub Date : 1996-10-01 DOI: 10.2307/2996779

J. Tester

引用次数: 38

Pollination biology and breeding system of Alliaria petiolata (Brassicaceae) 十字花科小葱(Alliaria petiolata)的传粉生物学及育种系统

Bulletin of the Torrey Botanical Club Pub Date : 1996-10-01 DOI: 10.2307/2996775

R. Cruden, A. M. McClain, G. P. Shrivastava

{"title":"Pollination biology and breeding system of Alliaria petiolata (Brassicaceae)","authors":"R. Cruden, A. M. McClain, G. P. Shrivastava","doi":"10.2307/2996775","DOIUrl":"https://doi.org/10.2307/2996775","url":null,"abstract":"CRUDEN, R. W., A. M. MCCLAIN (Department of Biological Sciences, University of Iowa, Iowa City, IA 52242) AND G. P. SHRIVASTAVA (School of Environmental Biology, APS. University, Rewa (M.P.), India 486 001). Pollination biology and breeding system of Alliaria petiolata (Brassicaceae). Bull. Torrey Bot. Club 123: 273-280. 1996.-Alliaria petiolata (Bieb.) Cavara and Grande is widely naturalized in the northeastern 1/4 of the United States and adjacent Canada, where it is an aggressive invader of moist woods. The plants are facultatively xenogamous, and the white flowers attract a variety of short-tongued bees and flies. High fruit and seed set by open-pollinated, emasculated flowers demonstrated that flower visitors move pollen between flowers. Cross-pollination resulted from the bees visiting only one or two flowers per plant. High fruit and seed set by bagged flowers demonstrated that flowers self-pollinate in the absence of pollinators. The nectar contained 51% fructose, 44% glucose, and little sucrose, which is typical of the nectars of flowers pollinated by short-tongued bees. The nectar contained no free amino acids, but did contain numbers of peptides, which, when hydrolyzed, yielded most of the amino acids present in floral nectars.","PeriodicalId":9453,"journal":{"name":"Bulletin of the Torrey Botanical Club","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2996775","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411019","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}

引用次数: 65

Effect of canopy gaps and flower patch size on pollinator visitation of Impatiens capensis 冠层间隙和花斑大小对凤仙花传粉者访花的影响

Bulletin of the Torrey Botanical Club Pub Date : 1996-07-01 DOI: 10.2307/2996793

B. B. Walters, E. Stiles

引用次数: 27

A comparison of growth efficiency of plants on the east and west sides of a forest canopy gap 林冠林隙东西两侧植物生长效率的比较

Bulletin of the Torrey Botanical Club Pub Date : 1996-07-01 DOI: 10.2307/2996799

L. S. Barden

{"title":"A comparison of growth efficiency of plants on the east and west sides of a forest canopy gap","authors":"L. S. Barden","doi":"10.2307/2996799","DOIUrl":"https://doi.org/10.2307/2996799","url":null,"abstract":"BARDEN, L. S. (Department of Biology, University of North Carolina at Charlotte, Charlotte, NC 28223). A comparison of growth efficiency of plants on the east and west sides of a forest canopy gap. Bull. Torrey Bot. Club 123:240-242. 1996.-The theoretical distribution of light in a circular forest canopy gap is symmetrically equal on the east and west sides of the gap. However, small plants on the west side of the gap receive maximum light in the morning when air temperature and vapor pressure deficit are relatively low, while plants on the east side receive maximum light in the afternoon when temperature and VPD are high. To test the hypothesis that plants on the west side of a gap are able to use light more efficiently, Microstegium vimineum, a shade-adapted annual grass, was grown in pots in a forest canopy gap, both in the actual open gap and in the extended gap. In the actual gap there was no difference in growth efficiency. However, in the extended gap growth efficiency was 39% greater on the west side than on the east side under equal light (integrated photon flux density). Thus, asymmetry of microclimate on the east and west sides of a canopy gap causes an east-west asymmetry in plant growth efficiency and may induce asymmetry in species composition of understory vegetation.","PeriodicalId":9453,"journal":{"name":"Bulletin of the Torrey Botanical Club","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2996799","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411375","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}

引用次数: 3

Understory influence of the invasive Norway maple (Acer platanoides). 入侵挪威枫对林下植被的影响。

Bulletin of the Torrey Botanical Club Pub Date : 1996-07-01 DOI: 10.2307/2996795

P. Wyckoff, S. Webb

{"title":"Understory influence of the invasive Norway maple (Acer platanoides).","authors":"P. Wyckoff, S. Webb","doi":"10.2307/2996795","DOIUrl":"https://doi.org/10.2307/2996795","url":null,"abstract":"WYCKOFF, PETER H. AND SARA L. WEBB (Biology Department, Drew University, Madison NJ 07940). Understory influence of the invasive Norway maple (Acer platanoides). Bull. Torrey Bot. Club 123:197-205. 1996.Norway maple (Acer platanoides) is invasive within a Fagus grandifolia-Acer saccharum-Quercus spp. forest preserve in New Jersey. To assess the community-level consequences of this invasion, we compared understory composition, richness, and structure beneath canopies of invasive Acer platanoides and of native Acer saccharum and Fagus grandifolia. Understory species richness was significantly lower beneath Acer platanoides and highest beneath Fagus grandifolia. Stem densities were high beneath Acer platanoides but consisted primarily of its own seedlings and saplings. When these Acer platanoides stems were removed from the analysis, there was a trend toward lower stem densities beneath the exotic tree compared with the native canopies. Individual shrub and forb species were too patchy for any canopy affinities to demonstrate significance within this small forest preserve, with two exceptions: Epifagus virginiana, a beech (Fagus) root parasite, was less abundant under Acer platanoides than under either Fagus grandifolia or Acer saccharum; and the shrub Lindera benzoin was less abundant under Acer platanoides and Fagus grandifolia than under Acer saccharum. Among tree seedlings, the exotic Acer platanoides far outnumbered all others, beneath its own canopy and also beneath the two native trees. A surprising paucity of Fagus grandifolia reproduction seems unrelated to the biological invasion. Acer saccharum has some prospects for self-replacement judging from sapling distributions but has sparse reproduction under the other canopy species relative to its exotic congener.","PeriodicalId":9453,"journal":{"name":"Bulletin of the Torrey Botanical Club","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1996-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2996795","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68411228","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}

引用次数: 81

The breeding system of desert milkweed, Asclepias subulata 沙漠马利筋(Asclepias subulata)的繁殖系统

Bulletin of the Torrey Botanical Club Pub Date : 1996-07-01 DOI: 10.2307/2996792

R. Wyatt, C. Ivey, S. Lipow, C. Ivey

引用次数: 14

Icones Pleurothallidium. XII. Systematics of Brachionidium. Addenda to Dresslerella, Platystele and Porroglossum (Orchidaceae). 标志性的Pleurothallidium。XII。Brachionidium的系统分类学。Dresslerella，Platystele和Poroglossum（兰科）的补遗。

Bulletin of the Torrey Botanical Club Pub Date : 1996-07-01 DOI: 10.2307/2996801

K. Barringer, C. Luer

引用次数: 2

A Manual of California Vegetation. 加州植被手册。

Bulletin of the Torrey Botanical Club Pub Date : 1996-07-01 DOI: 10.2307/2996802

A. Greller, J. O. Sawyer, T. Keeler-Wolf

引用次数: 4