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4、2588.html203.208.60.580攀瀀栀琀洀氀騀栀鄀羭/前台访问/search.html?page=5&tc=110&hotKeyword=%E9%9F%B3%E9%A2%91&d=-1&p=0&fileType=-1&t=203.208.60.330浰挀瀀栀琀洀氀鰀钾/Ke前台访问/p-147180.html207.46.13.1610%魿攀搀栀琀洀氀鸀鋭/Kg前台访问/p-371574.html203.208.60.1190挀搀栀琀洀氀鰀/Ie前台访问/d-72747.html203.208.60.1020跐攀瀀栀琀洀氀/Kg前台访问/p-931401.html216.244.
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7、tml139.189.200.18(想r攑乹 开展 了理 了 范作用 护林 发展三北 生物 性 国林业可持 发展 了 方 的作 中国三北009 目 组织 家编写了中国北方小叶杨 展 三北防护林程开展国合作成 的 currency1 也 “ 述三北 树种小叶杨的 ficurrency1中可 fl 了中国小叶杨的历史分布、消长变、 成 、发展程 护、发展、 小叶杨的历史 更加fl 利用小叶杨的 并成 今 开展小叶杨 的” 国家林业局三北防护林建设局局长 中国三北009目 小组组长 2001.12.31. Preface Natural resources, including forest res
8、ources, are at the origin of a countrys welfare and prosperity. Protection and development of forest resources play an extremely important role in the maintenance and improvement of the environment, the sustainability of the national economic development and in the increase of peoples living standards. The small-leaf poplar Populus simonii Carr. has always been an important tree species in Northern China, with a vast natural distribution, a long history of cultivation, and a large planting area. It is considered among one of
