Ecological classification

Xem 1-10 trên 10 kết quả Ecological classification
  • This book, now in its third edition, began almost 25 years ago when Weed Ecology: Implications for Vegetation Management was published in 1984. That text concentrated on the need for farmers, foresters, rangeland managers, and the researchers who advised them to understand better the biology of weeds and the role people play in creating and maintaining weeds in agriculture and other production systems. We were assisted in that first effort by the writings of many early scientists, such as J. L. Harper, H. G. Baker, and E. J.

    pdf475p camchuong_1 11-12-2012 37 7   Download

  • The history and development of the longleaf pine (Pinus palustris Mill.) ecosystem in the southeastern United States has intrigued natural resource professionals, researchers, and the general public for many decades. Prior to European settlement, longleaf pine forests were one of the most extensive ecosystems in North America. Most recent estimates suggest that only about 2.2% of the original area remains today, making it one of the most threatened ecosystems in North America.

    pdf438p phoebe75 01-02-2013 16 7   Download

  • The designation used and the presentation of the material in this publication do not imply the express of any opinion whatsoever on the part of the Secretariat of the United Nations Economic and Social commission for Asian and the Pacific (UNESCAP) concerning the delimitation of its frontiers or boundaries. The views expressed in this publication are those of authors and do not necessarily reflect the view of UNESCAP. Mention of firm names and commercial products does not imply the endorsement of the...

    pdf65p lulanphuong 20-03-2012 92 28   Download

  • In response to a growing need to bridge aspects of geography and ecology, Troll (1950, 1968) coined the term “landscape ecology,” which was adopted as a new scientific discipline. According to Troll (1968), the landscape can be studied in terms of its morphology, classification, and changes in time (history), as well as the functional relationships between its components, which he called landscape ecology. Troll also considered that problems of landscape protection as well as management should be included in geographical analyses of landscapes.

    pdf348p crazy_sms 10-05-2012 61 25   Download

  • Human activities are affecting the global environment in myriad ways, with numerous direct and indirect effects on ecosystems. The climate and atmospheric composition of Earth are changing rapidly. Humans have directly modified half of the ice-free terrestrial surface and use 40% of terrestrial production. Our actions are causing the sixth major extinction event in the history of life on Earth and are radically modifying the interactions among forests, fields, streams, and oceans.

    pdf455p phoebe75 01-02-2013 38 8   Download

  • The mountainous area occupies three fourth of the total area of Binh Dinh Province. The potential of landuse is very large. However, under the influence of irrational exploitation and natural disasters in the past, the land resource has declined, thus leading to the decline of forest resource. Furthermore, the increase of unused land and bare hills along with the decrease in the cultivated area seriously influenced on the ecological environment as well as the socio-economic development.

    pdf8p dem_thanh 22-12-2012 28 5   Download

  • The programme comprises a feed data library and various ‘Nutrition masters’. To create the feed data library, a wide range of feed ingredients including green and dry fodders, tree leaves, grains, oil cakes, agro-industrial by-products etc. were collected from different agro-ecological zones of the country and analyzed for chemical composition and nutritive value.

    pdf28p conduongdinhmenh 07-05-2013 34 2   Download

  • To date, there have been data of five species and one variety of Blastus in Vietnam, among them one species and one variety may be endemic to Vietnam, which are Blastus eglandulosus and B. boneensis var. eberhardtii. In this article, we provided the diagnostic characteristics of the Blastus species found in Vietnam, provided some information about distribution, ecology, biology and the identification key to these five species and one variety.

    pdf9p nguoibakhong02 06-10-2017 41 1   Download

  • Over the past 25 years the discipline of ecotoxicology has undergone two major developments. Firstly, new assays have been developed, deploying organisms that bear added relevance to the specific environment under investigation. Several new procedures assess the effects on organisms after exposure to environmental samples rather than to spiked water or sediment samples. Also noteworthy is the considerable attention given to effects of chronic exposure to low levels of contaminants.

    pdf293p phoebe75 01-02-2013 24 5   Download

  • Schröder Environmental Sciences Europe 2011, 23:20 http://www.enveurope.

    pdf6p dauphong13 10-02-2012 23 4   Download


Đồng bộ tài khoản