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the northwest shanxi
相关语句
  晋西北
     GRAIN PRODUCTION AND AGRICULTURAL DISASTER IN THE NORTHWEST SHANXI
     晋西北粮食生产特点和农业自然灾害
短句来源
     Preliminary Study on Introduction and Training of Tree Species in the Northwest Shanxi
     晋西北树木引种驯化初步研究
短句来源
     Changes of the social and economical structures in the rural region of the northwest Shanxi took place because of the Revolution and Japanese invasion in 1930-1940s, which led to the weakening of the economical position of the landlords and their living level's decrease in the region.
     革命与日本入侵构成了20世纪三四十年代晋西北农村社会的基本生态背景,革命引起了社会经济结构的变化,战争却耗尽了农村所有的资源和储备,农民整体生活水平呈现出下降走势,而“地主阶层”表现尤甚,其经济地位与生活水平被极大地弱化了。
短句来源
     The peasant economy was dominant in the northwest Shanxi in modern China.
     晋西北农村在近代中国是不折不扣的“边缘地区”,小农经济始终居于主导地位。
短句来源
     On the Peasant's Living in the Northwest Shanxi in 1930s-1940s——Concurrently with Changes of Economical and Living Levels on the Landlords Classes
     三四十年代晋西北农民家庭生活实态——兼论“地主阶层”经济与生活水平之变化
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  “the northwest shanxi”译为未确定词的双语例句
     Study on Succession of Plant Communities on Abandoned Lands in the Northwest Shanxi, China
     晋北低中山撂荒地植物群落演替研究
短句来源
     On the Rural Hired-workers of the Northwest Shanxi in the Turning of 1930-1940' s
     二十世纪三四十年代晋西北的农业雇工
短句来源
  相似匹配句对
     The Bygones in The Northwest
     西北往事
短句来源
     Northwest China.
     西北区。
短句来源
     Mysterious Northwest
     神秘西北
短句来源
     It is noted that the Northwest.
     指出,20世纪中国西北、东北、华北明显变暖;
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     Shanxi Apartment
     陕西公寓
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  the northwest shanxi
Based on the test results in arid and cold area of the northwest Shanxi, the hybrid poplar trees takingPopulus cathaysna as their female parent could be selected for afforestation, such asP.
      


The dune area in the northwest Shanxi Province, is an area developing into desert. The wind erosion occours mainly in spring when the great majority of gales within a year occur, meeting with droughts and naked farmland, which has caused intensive wind erosion on the farmland with erosion modulus of 12780 t/km~2. Vegetation is greatly effective in preventing wind erosion, for wind erosion in forest only being 1/10 of that on farmland and 1/35 of dust over farmland. Suggestions on how to prevent wind erosion...

The dune area in the northwest Shanxi Province, is an area developing into desert. The wind erosion occours mainly in spring when the great majority of gales within a year occur, meeting with droughts and naked farmland, which has caused intensive wind erosion on the farmland with erosion modulus of 12780 t/km~2. Vegetation is greatly effective in preventing wind erosion, for wind erosion in forest only being 1/10 of that on farmland and 1/35 of dust over farmland. Suggestions on how to prevent wind erosion have been put forward in this paper.

晋西北丘陵缓坡风沙区是沙漠化正在发展区,本文根据该区右玉县观测资料,分析了产生风蚀的主要原因及影响因素。分析表明,风蚀主要发生在春季。此期风大、干旱和地面无植被,导致了农地的严重风蚀。其年侵蚀强度达12780t/km~2。地面植被对于风蚀具有明显的抑制作用。林地平均年风蚀量仅为农地的1/10,沙尘量为农地上空的1/35。对如何防治该区的风蚀,作者也提出了若干建议。

The paper analyses the temporal and spatial changes of grain production in the 50 townships of the Northwest Shanxi Province during 1952~1992,and discusses the distribution of disaster impacet.It is concluded that the agricultural disasters(mainly drought) severely influence live and welfare of the local farmers,but the situation can be changed at some extent by the input of money and labour.

对晋西北河曲、保德、偏关3县50个乡镇1952~1992年间粮食生产的时空变化规律作了系统的分析,讨论了粮食减产率的时空差异,对农民生活的影响及与自然灾害、人为投入的关系。

Through five years (1996-2000) experiment, the growth characteristics and resistance to insect and cold of the seven poplar varieties including P. po pularis, P. opera, P. pseudo-simonii, P. beijinensis, P. bolleana, P. ( eurameri cana and P. simonii, which were planted in loess hilly land in northwest Shanxi Province, were tested under different planting densities and site conditions. A randomized block design and three times repetition were adopted in the test. Bas ed on the test results in...

Through five years (1996-2000) experiment, the growth characteristics and resistance to insect and cold of the seven poplar varieties including P. po pularis, P. opera, P. pseudo-simonii, P. beijinensis, P. bolleana, P. ( eurameri cana and P. simonii, which were planted in loess hilly land in northwest Shanxi Province, were tested under different planting densities and site conditions. A randomized block design and three times repetition were adopted in the test. Bas ed on the test results in arid and cold area of the northwest Shanxi, the hybrid poplar trees taking Populus cathaysna as their female parent could be selected for afforestation, such as P. popularis and P. opera, and the growing space of s ingle plant should be larger than 20 m2. P. bolleana as an introduced tree speci es grows well in this area, but its growth is likely affected by ground water co ndition. On the site with relatively abundant soil water, P. bolleana usually su ffer from frost crack at its trunk base. As a result, P. bolleara is suited to p lanting in the site where is short of soil water. P. x euramericana is not suita ble for large-scale afforestation, especially in arid slopes and ridges of loess hilly land .

在山西省西北部黄土丘陵区,通过对7个杨树品种:群众杨(P.popularis)、合作杨(P .opera)、小青杨(P.pseudosimonii)、北京杨(P.beijingensis)、新疆杨(P.opulus bolle ana)、沙兰杨(P.×euramericana)、小叶杨(P.simonii)的引种栽培试验,随机区组3次重 复,研究其在不同立地条件下的生长量及对虫害、冻害的抗性,通过5年观测分析,提出了 在干旱寒冷的晋西北地区,应选择以青杨为母本的杂交杨,如群众杨、合作杨、小黑杨等进 行造林,单株营养面积应大于20 m2。新疆杨作为引进树种在该地区生长表现良好,但树木 的生长受地下水影响明显。在土壤水分比较充沛的地方,新疆杨树干基部则易冻裂。因此, 此树种最宜在土壤水分贫乏地造林。欧美杨不适宜大面积造林,尤其是在黄土丘陵干旱的坡 梁地段。

 
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