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Windahayati Windahayati - One of the best experts on this subject based on the ideXlab platform.

  • STUDI MIKROMORFOLOGI KAPSUL DAN SPORA SERTA IMPLIKASINYA TERHADAP PENGELOMPOKKAN LUMUT Pogonatum P. Beauv. (Polytrichaceae)
    2013
    Co-Authors: Windahayati Windahayati
    Abstract:

    Mikromorfologi kapsul dan spora merupakan karakter penting untuk mengidentifikasi dan mengklarifikasi taksa yang bermasalah. Sampai saat ini, jumlah jenis Pogonatum di Sumatera Barat belum diketahui secara pasti karena ada keraguan dalam penentuan jenisnya. Tujuan penelitian ini adalah untuk mengidentifikasi dan menggelompokkan spesies dalam genus Pogonatum berdasarkan karakter mikromorfologi kapsul dan spora. Penelitian mengenai mikromorfologi kapsul dan spora Pogonatum spp. telah dilakukan dari bulan Maret sampai Agustus 2013. Sampel dikoleksi langsung di dua lokasi (Cagar Alam Lembah Anai dan Gunung Singgalang) dengan dua rute penjelajahan yaitu rute Kandang Ampek-Mega Mendung dan rute Pandai Sikek-Puncak Singgalang. Mikromorfologi kapsul dan spora diamati menggunakan Scanning Electron Microscope (SEM). Hasil penelitian menunjukkan bahwa ditemukannya lima spesies Pogonatum (P. ciratum, P. microstomum, P. macrophyllum, P. subtortile var. teysmannianum, dan P. cf. wallisi). Hasil pengamatan terhadap karakter mikromorfologi menunjukkan bahwa Pogonatum mempunyai tipe gigi peristom nematodontous, tipe spora monolete, bentuk spora prolate dengan tipe ornamentasi granulate dan echinate. Keseluruhan individu yang dianalisis cenderung terkelompok dalam spesiesnya masing-masing. Hasil penelitian ini mendukung penempatan Pogonatum sebagai genus yang mirip dengan Polytrichum secara mikromorfologi. Kata kunci : kapsul, Pogonatum, Polytrichum, SEM, spor

- Syamsuardi - One of the best experts on this subject based on the ideXlab platform.

  • Studi Mikromorfologi Kapsul dan Spora serta Implikasinya terhadap Pengelompokkan Lumut Pogonatum P. Beauv. (Polytrichaceae)
    'Perpustakaan Universitas Andalas', 2015
    Co-Authors: - Windahayati, Arbain Ardinis, - Syamsuardi
    Abstract:

    The micromorphology capsule and spore are important characters for identification and clarification of problematic taxa in Bryophyta. The number of Pogonatum species in West Sumatra are still unclarified. The purpose of this study is to identify and to make a Pogonatum cluster based on micromorphology of capsule and spore characters. This study has been conducted from March to August 2013. Samples were directly collected in two exploration routes namely Cagar Alam Lembah Anai (Kandang Ampek - Mega Mendung route) and Singgalang Mountain (Pandai Sikek - Top Singgalang route). The micromorphology of capsule and spore of Pogonatum were observed using a Scanning Electron Microscope (SEM). The results showed that five species of Pogonatum (P. ciratum, P. microstomum, P. macrophyllum, P. Teysmannianum , and P. cf. urnigerum) were identified. The key characters of Pogonatum was nematodontous peristome teeth, monolete spore type, prolate spore shape with granulate and echinate ornamentation. Cluster analysis of 44 individuals indicated that Pogonatum tends to be in the same group. Based on micromorphological analysis, the results supported that Pogonatum was similar to Polytrichum. Keywords: peristome teeth, Pogonatum, Polytrichum, SEM, spor

Harri Vasander - One of the best experts on this subject based on the ideXlab platform.

  • raised atmospheric co2 levels and increased n deposition cause shifts in plant species composition and production in sphagnum bogs
    Global Change Biology, 2001
    Co-Authors: Frank Berendse, Alexandre Buttler, Håkan Rydin, Nico Van Breemen, Monique M P D Heijmans, Marcel R Hoosbeek, J A Lee, Edward A D Mitchell, Timo Saarinen, Harri Vasander
    Abstract:

    Part of the missing sink in the global CO2 budget has been attributed to the positive effects of CO2 fertilization and N deposition on carbon sequestration in Northern Hemisphere terrestrial ecosystems. The genus Sphagnum is one of the most important groups of plant species sequestrating carbon in temperate and northern bog ecosystems, because of the low decomposability of the dead material it produces. The effects of raised CO2 and increased atmospheric N deposition on growth of Sphagnum and other plants were studied in bogs at four sites across Western Europe. Contrary to expectations, elevated CO2 did not significantly affect Sphagnum biomass growth. Increased N deposition reduced Sphagnum mass growth, because it increased the cover of vascular plants and the tall moss Polytrichum strictum. Such changes in plant species composition may decrease carbon sequestration in Sphagnum-dominated bog ecosystems.

Bartkevičius Edmundas - One of the best experts on this subject based on the ideXlab platform.

  • Dynamics of ground vegetation after surface fires in hemiboreal Pinus sylvestris forests
    2020
    Co-Authors: Račinskas Jonas, Bartkevičius Edmundas
    Abstract:

    The aim of this work was to investigate the changes of ground vegetation (field layer: mosses, lichens; ground layer: herbs, shrubs, tree seedlings and saplings) and regeneration of tree species in pine forests after surface fires. The study area was located in Southern part of Lithuania in hemiboreal zone of Europe. The field and ground vegetation was recorded in forest stands burned in 1992 and 1994-2002 and compared with the nearby control fire untouched areas. We selected five burned areas for each year (total 50 burned stands). Vegetation sampling was conducted during July and August 2003. For vegetation description in each stand we systematically placed twenty Imxlm plots. Mann-Whitney nonparametric test was used to identify significant differences in vegetation between burned and untouched areas. It was determined that species richness increased after fire. Early successional species such as Agrostis capillaris L., Calamagrostis epigejos (L.) Roth, Chamerion angustifolium (L.) Holub, Festuca ovina L.and Melampyrum pratense L. invaded in burned areas immediately after fire. Abundance of dominant species (Vaccinium myrtillus L. and Vaccinium vitis-idaea L.) recovered after 5 years. Pioneer moss species (Polytrichum piliferum Hedw. and Polytrichum juniperinum Hedw.) replaced late successional mosses (Dicranum polysetum Sw., Dicranum scoparium Hedw., Hylocomium splendens (Hedw.) Schimp. and Pleurozium schreberi (Brit.) Mitt.). Species number in the shrub layer decreased. Juniperus communis L. was killed by fire. Amount of undergrowth decreased first 4 years after fire. Saplings of Picea abies (L.) Karst., disappeared at all. Fire stimulated regeneration of Pinus sylvestris L., especially first 4 years after fire. Herbaceous and dwarf shrubs recovered 5-6 years after fire, moss cover—9 years after fire. Differences in moss species composition still remained 11 years after fire. Main finding suggest that fire is favourable to biodiversity of pine forestVytauto Didžiojo universitetasŽemės ūkio akademij

  • Surface fires effect on ground vegetation in Scots pine forests in Lithuania
    2019
    Co-Authors: Marozas Vitas, Račinskas Jonas, Bartkevičius Edmundas
    Abstract:

    The aim of this work was to investigate the changes of ground vegetation (mosses, lichens and herbs) in pine forests after surface fires. The study area was located in Southern part of Lithuania. The ground vegetation was recorded in forest stands burned in different time (11 years interval) and compared with the nearby control fire untouched area. It was determined that species richness increased after fire. Early successional species invaded in burned areas immediately after fire. Abundance of dominant species (Vaccinium myrtillus L. and Vaccinium vitis-idaeaL.) recovered after 5 years. Pioneer moss species {Polytrichum piliferum Hedw. and Polytrichum juniperinum Hedw.) replaced late successional mosses (Dicranumpolysetum Sw., Dicranum scoparium Hedw., Hylocomium splendens (Hedw.) Schimp. and Pleurozium schreberi (Brit.) Mitt.). Changes of ground vegetation induced by surface fire remained 3-4 years after fire. Herbaceous and dwarf shrubs recovered 5-6 years after fire, moss cover - 9 years after fire. Differences in moss species composition still remained 11 years after fireVytauto Didžiojo universitetasŽemės ūkio akademij

  • Dynamics of ground vegetation after surface fires in hemiboreal Pinus sylvestris L. forests
    2008
    Co-Authors: Račinskas Jonas, Bartkevičius Edmundas
    Abstract:

    The aim of this work was to investigate the changes of ground vegetation (field layer: mosses, lichens, and ground layer: herbs, shrubs, tree seedlings and saplings) and regeneration of tree species in pine forests after surface fires. The study area was located in Southern part of Lithuania in hemiboreal zone of Europe. The field and ground vegetation was recorded in forest stands burned in 1992 and 1994-2002 years and compared with the nearby control fire untouched areas. We selected 5 burned areas for each year (total 50 burned stands). Vegetation sampling was conducted during July and August of 2003. For vegetation description in each stand we systematically placed twenty 1x1 m plots. Mann-Whitney nonparametric test was used to identify significant differences in vegetation between burned and untouched areas. It was determined that species richness increased after fire. Early successional species such as Agrostis capillaris L., Calamagrostis epigejos (L.) Roth, Chamerion angustifolium (L.) Holub, Festuca ovina L. and Melampyrum pratense L. invaded in burned areas immediately after fire. Abundance of dominant species (Vaccinium myrtillus L. and Vaccinium vitis-idaea L.) recovered after 5 years. Pioneer moss species (Polytrichum piliferum Hedw. and Polytrichum juniperinum Hedw.) replaced late successional mosses (Dicranum polysetum Sw., Dicranum scoparium Hedw., Hylocomium splendens (Hedw.) Schimp. and Pleurozium schreberi (Brit.) Mitt.). Species number in the shrub layer decreased. Juniperus communis L. was killed by fire. Amount of undergrowth decreased first four years after fire. Saplings of Picea abies (L.) Karst., disappeared at all. Fire stimulated regeneration of Pinus sylvestris L., especially first four years after fire. Herbaceous and dwarf shrubs recovered 5-6 years after fire, moss cover - 9 years after fire. Differences in moss species composition still remained 11 years after fireVytauto Didžiojo universitetasŽemės ūkio akademij

- Windahayati - One of the best experts on this subject based on the ideXlab platform.

  • Studi Mikromorfologi Kapsul dan Spora serta Implikasinya terhadap Pengelompokkan Lumut Pogonatum P. Beauv. (Polytrichaceae)
    'Perpustakaan Universitas Andalas', 2015
    Co-Authors: - Windahayati, Arbain Ardinis, - Syamsuardi
    Abstract:

    The micromorphology capsule and spore are important characters for identification and clarification of problematic taxa in Bryophyta. The number of Pogonatum species in West Sumatra are still unclarified. The purpose of this study is to identify and to make a Pogonatum cluster based on micromorphology of capsule and spore characters. This study has been conducted from March to August 2013. Samples were directly collected in two exploration routes namely Cagar Alam Lembah Anai (Kandang Ampek - Mega Mendung route) and Singgalang Mountain (Pandai Sikek - Top Singgalang route). The micromorphology of capsule and spore of Pogonatum were observed using a Scanning Electron Microscope (SEM). The results showed that five species of Pogonatum (P. ciratum, P. microstomum, P. macrophyllum, P. Teysmannianum , and P. cf. urnigerum) were identified. The key characters of Pogonatum was nematodontous peristome teeth, monolete spore type, prolate spore shape with granulate and echinate ornamentation. Cluster analysis of 44 individuals indicated that Pogonatum tends to be in the same group. Based on micromorphological analysis, the results supported that Pogonatum was similar to Polytrichum. Keywords: peristome teeth, Pogonatum, Polytrichum, SEM, spor