What caused the degradation in 20 years of elm (Ulmus Pumila L.) woodland in China

机译：是什么导致了中国20年榆树（Ulmus Pumila L.）林地的退化

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As a special rangeland, elm ( Ulmus Pumila L.) woodland, fixing sand and supplying forage to herbivores, is a woody plant community distributed on sand dunes in meadow steppe regions under semi‐hygrophilous or semi‐arid climate (Zhu,1992).Since 1980s, its distribution region has been shrinking severely in China.So we aim to anchor the degraded reasons through comparing elm woodland species changes under different disturbances between 20years.

机译：作为一种特殊的牧场，榆木林（Ulmus Pumila L.）固定沙子并为草食动物提供饲料，是一种木本植物群落，分布在半湿润或半干旱气候下的草甸草原地区的沙丘上（Zhu，1992）。自1980年代以来，其分布区域在中国一直在严重缩小，因此我们旨在通过比较20年间在不同干扰下的榆木林地物种变化来确定退化原因。

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来源
《2008世界草地与草原大会论文集》|2008年||共1页
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Li Liu; Tingcheng Zhu;
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Elm wood land; diversity; Shannon‐Weaver index; farming; grazing;

机译：榆木林地;多样性;香农韦弗指数;农业;放牧;

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1. Effect of salt stress on activity of superoxide dismutase （SOD） in Ulmus pumila L. [J] . SONG, Fu-nan, YANG, 林业研究：英文版 . 2006,第001期
2. Vegetation and Community Changes of Elm (Ulmus pumila) Woodlands in Northeastern China in 1983-2011 [J] . LIU Li, WANG He, LIN Changcun, 中国地理科学（英文版） . 2013,第003期

机译：1983 - 2011年，中国东北榆树（Ulmus Pumila）林地植被及社区变迁
3. Genetic diversity and relationships among Dutch elm disease tolerant Ulmus pumila L. accessions from China [J] . Brunet Johanne, Guries Raymond P., Zalapa Juan E. Genome . 2008,第7期

机译：中国榆树耐性榆树种的遗传多样性及亲缘关系
4. Genetic diversity and relationships among Dutch elm disease tolerant Ulmus pumila L. accessions from China [J] . Juan E. Zalapa, Johanne Brunet, Raymond P. Guries Genome . 2008,第7期

机译：中国耐受荷兰榆病的榆树种的遗传多样性及亲缘关系
5. The Effects of Grazing on Reproductive Allocation of Elm (Ulmus Pumila) in Sparse Grassland of Horqin Sand Land, North-eastern China [C] . Yi Tang, Deming Jiang ICECS 2010;International conference on environmental and computer science . 2010

机译：放牧对科尔沁沙地稀疏草地榆树生殖分配的影响。
6. In vitro mansonone production and vascular staining in populations, trees within populations and individual progeny of Ulmus americana L. in relation to Dutch elm disease [D] . Meier, Fred George 1996

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7. Seasonal dynamics of microbial diversity in the rhizosphere of Ulmus pumila L. var. sabulosa in a steppe desert area of Northern China [O] . Tianyu Liang, Guang Yang, Yunxia Ma, -1

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8. The effects of grazing on the spatial pattern of elm (Ulmus pumila L.) in the sparse woodland steppe of Horqin Sandy Land in northeastern China [O] . M. Zhang, J. Wu, Y. Tang 2016

机译：放牧对中国东北科尔沁沙地稀疏林地草原榆树（榆树）空间格局的影响

What caused the degradation in 20 years of elm (Ulmus Pumila L.) woodland in China

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