| 書目名稱 | Halophytes as a resource for livestock and for rehabilitation of degraded lands | | 編輯 | Victor R. Squires,Ali T. Ayoub | | 視頻video | http://file.papertrans.cn/421/420591/420591.mp4 | | 叢書名稱 | Tasks for Vegetation Science | | 圖書封面 |  | | 描述 | Desertification (land degradation in arid, semi-arid and dry sub-humid areas resulting mainly from adverse human impacts) is the main environmental problem of dry lands, which occupy more than 40 per cent of the total global land area. The phenomenon threatens about 3.6 billion hectares and currently affects the livelihood of about 900 million people. Thl! world is now losing annually about 1.5 million hectares of total irrigated lands (240 million hectares) due mostly to salinization, mainly in drylands. Salt affected soils are widely distributed throughout the arid and semi-arid regions, and particularly severe in China (7 million ha), India (20 million ha), Pakistan (3.2 million ha), USA (5.2 million ha), as well as Near East, southern Europe and elsewhere. Demands on production have increased the pressure on existing productive land and moved the limits of production onto increasingly marginal lands. Wise land-use practices have yet to be developed for such conditions. The Executive Director of UNEP reported to the Governing Council in February 1992 concerning the "Status of Desertification and Implementation of the United Nations Plan of Action to Comtat Desertification (PACD) | | 出版日期 | Book 19941st edition | | 關(guān)鍵詞 | biodiversity; conservation; plants | | 版次 | 1 | | doi | https://doi.org/10.1007/978-94-011-0818-8 | | isbn_softcover | 978-94-010-4351-9 | | isbn_ebook | 978-94-011-0818-8Series ISSN 0167-9406 Series E-ISSN 1875-130X | | issn_series | 0167-9406 | | copyright | Springer Science+Business Media Dordrecht 1994 |
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