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Sunday, 25 December 2016

Soil Carbon Dynamics in Residential Lawns Converted from Appalachian Mixed Oak Stands

Published Date
Forests 20145(3), 425-438; doi:10.3390/f5030425

Author


Department of Forest Resources and Environmental Conservation (0324), 228 Cheatham Hall, Virginia Tech, 310 West Campus Drive Blacksburg, Blacksburg, VA 24061, USA
*
Author to whom correspondence should be addressed.
Received: 7 January 2014 / Revised: 4 March 2014 / Accepted: 5 March 2014 / Published: 19 March 2014
(This article belongs to the Special Issue Forest and Wood Vegetation Carbon Stores and Sequestration)
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Abstract 

The conversion of unmanaged forest land to homesites dominated by managed turfgrass lawns continues to increase and has large potential impacts on biogeochemical cycling. The conversion process from forest into mowed turfgrass involves a major disturbance to soil properties and shift in ecological conditions, which could affect soil physical, chemical and biological properties, including carbon sequestration. We conducted a study on 64 residential properties, ranging from 5 to 52 years since development, to compare soil carbon content, bulk density, temperature, and moisture, between lawns and the surrounding forests from which they were converted. Homeowners were surveyed on lawn management practices and environmental attitudes, and the relationships between these and soil properties were investigated. Soil bulk density was significantly higher in the upper 10 cm of lawns compared to adjacent forest (35% higher at 0–5 cm and 15.6% higher at 5–10 cm). Total soil C content to 30 cm of lawn (6.5 kg C m−2) and forest (7.1 kg C m−2) marginally differed (p = 0.08), and lawns contained significantly greater C (0.010 g C cm−3) than forests (0.007 g C cm−3) at the 20–30 cm soil depth (p = 0.0137). In the lawns, there was a positive relationship between time since development and surface (0–5 cm) C concentration (p = 0.04), but a negative relationship at 20–30 cm (p = 0.03). Surface soils also exhibited a positive correlation between fertilization frequency and C (p = 0.0005) content. Lawn management intensity (fertilizer and pesticide use) increased with environmental commitment. Homeowners with a higher environmental commitment had lawns with greater soil carbon levels. Our results indicate that converting unmanaged Appalachian hardwood forest into managed, turfgrass-dominated residential landscapes may affect C depth distribution, but results in little change in total soil carbon sequestration in the upper 30 cm. View Full-Text

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Pemerolehan Dan Penguasaan Kecekapan Berbahasa Melayu Dalam Kalangan Pelajar Asing Di Universiti Sains Malaysia

Published Date
Procedia - Social and Behavioral Sciences
15 May 2014, Vol.134:270275doi:10.1016/j.sbspro.2014.04.248
Multifarious Roles of Language in Society
Open Access, Creative Commons license
  • Mazlina Baharudin ,
  • Pusat Pengajian Bahasa, Literasi dan Terjemahan, Universiti Sains Malaysia, Pulau Pinang, Malaysia

Abstract

Bahasa Melayu dipelajari oleh pelajar asing? Ia bukanlah sesuatu yang mustahil untuk dilakukan. Malah, tidaklah menghairankan kerana ada dalam kalangan mereka ini boleh bertutur dengan fasih dalam masa yang singkat. Setiap hari semakin ramai pelajar antarabangsa yang datang ke Malaysia untuk menyambung pengajian mereka. Pemerolehan dan penguasaan kecekapan berbahasa Melayu dalam kalangan pelajar asing berbeza mengikut individu. Kajian ini akan mengenal pasti faktor-faktor pendorong yang menyebabkan pelajar asing ini boleh menguasai bahasa Melayu dengan baik. Responden kajian adalah pelajar Kursus Bahasa Malaysia I (LKM100) di Pusat Pengajian Bahasa, Literasi dan Terjemahan, Universiti Sains Malaysia, Pulau Pinang. Oleh yang demikian itu, satu analisis tahap kemahiran dan keperluan akan dibuat berdasarkan pemerolehan dan penguasaan kecekapan berbahasa Melayu dalam kalangan pelajar asing di USM. Dapatan yang diperoleh mendapati bahawa setiap pelajar mempunyai tahap pemerolehan dan penguasaan kecekapan berbahasa Melayu yang berbeza antara individu. Perbezaan ini disebabkan oleh pelbagai faktor penyumbang seperti keinginan individu, negara asal, persekitaran tempat tinggal, rakan-rakan dan sebagainya.
Keywords

  • pemerolehan
  • penguasaan
  • kecekapan berbahasa 
  • pelajar asing.



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    • Selection and peer-review under the responsibility of the Organizing Committee of ICLALIS 2013.
    • ⁎ 
      Tel.: +6012-6116064.
    For further details log on website :
    http://www.sciencedirect.com/science/article/pii/S1877042814031589

    Persamaan Dan Perbezaan Sebutan Dan Makna Dalam Pelbagai Dialek Bahasa Kadazandusun

    Published Date
    Procedia - Social and Behavioral Sciences
    15 May 2014, Vol.134:446453doi:10.1016/j.sbspro.2014.04.267
    Multifarious Roles of Language in Society
    Open Access, Creative Commons license

    Author 
    • Dayu Sansalu ,,
    • Pusat Penataran Ilmu Dan Bahasa, Universiti Malaysia Sabah, Jalan UMS, 88400Kota Kinabalu, Malaysia
    Bahasa
  • dialek 
  • etnik dan subetnik Kadazandusun




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    • Selection and peer-review under the responsibility of the Organizing Committee of ICLALIS 2013.
    • ⁎ 
      Tel.: +6088-320000 Ext.5883; fax: +6088-435708.
    For further details log on website :
    http://www.sciencedirect.com/science/article/pii/S1877042814031772

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