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   the northwest of shanxi 在 农业基础科学 分类中 的翻译结果: 查询用时:0.339秒
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the northwest of shanxi
相关语句
  晋西北
    Features and Hazards of Land Degradation in the Northwest of Shanxi Province
    晋西北地区土地退化特征及危害研究
短句来源
    The dune area in the northwest of Shanxi Province, is an area developing into desert.
    晋西北丘陵缓坡风沙区是沙漠化正在发展区。
短句来源
    It studied the relationship between the dam and reservoir control area ratio to the total area,the dam and reservoir capacity unit area(DRCA),the critical DRCA and sediment reduction effect in the northwest of Shanxi and north of Shaanxi in the Hekouzhen-Longmen area of middle reaches of the Yellow River. The results show that:(1) In the northwest of Shanxi,without the dam and reservoir engineering,the control measure of the slopeland accounted for 14% in sediment reduction.
    对黄河中游河龙区间晋西北片、陕北片坝库控制面积占比、坝库单位面积库容等参数与水利水土保持措施减沙效益关系进行了研究,结果表明:(1)晋西北片若没有坝库工程,仅靠水土保持坡面治理措施只能取得14%的减沙效益;
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The dune area in the northwest of Shanxi Province, is an area developing into desert. The wind erosion occours mainly in spring when great majority of gales within a year occour, meeting with droughts and naked farmland, which has caused intensive wind erosion on the farmland with erosion modulus of 12780 t/km~2·a. Vegetation is greatly effective in preventing wind erosion, for wind ero sion on forestry only being 1/10 of that on farmland and 1/35 of dust over farm land. Suggestions on how to prevent wind...

The dune area in the northwest of Shanxi Province, is an area developing into desert. The wind erosion occours mainly in spring when great majority of gales within a year occour, meeting with droughts and naked farmland, which has caused intensive wind erosion on the farmland with erosion modulus of 12780 t/km~2·a. Vegetation is greatly effective in preventing wind erosion, for wind ero sion on forestry only being 1/10 of that on farmland and 1/35 of dust over farm land. 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。风蚀主要发生在春季,此期间风大、干旱和地面无植被共同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,沙尘量约为农地上空的1/35。对如何防治该区的风蚀,作者亦提出了若干建议。

It studied the relationship between the dam and reservoir control area ratio to the total area,the dam and reservoir capacity unit area(DRCA),the critical DRCA and sediment reduction effect in the northwest of Shanxi and north of Shaanxi in the Hekouzhen-Longmen area of middle reaches of the Yellow River.The results show that:(1) In the northwest of Shanxi,without the dam and reservoir engineering,the control measure of the slopeland accounted for 14% in sediment reduction.The sediment reduction...

It studied the relationship between the dam and reservoir control area ratio to the total area,the dam and reservoir capacity unit area(DRCA),the critical DRCA and sediment reduction effect in the northwest of Shanxi and north of Shaanxi in the Hekouzhen-Longmen area of middle reaches of the Yellow River.The results show that:(1) In the northwest of Shanxi,without the dam and reservoir engineering,the control measure of the slopeland accounted for 14% in sediment reduction.The sediment reduction effect increases with the increase of the dam and reservoir control area,reservoir capacity and DRCA: the increase of 100 km2 in dam and reservoir control area can increase 2% in sediment reduction effect;the increase of 4 000 000 m3 in the reservoir capacity can increase 1%;and the increase of 10 000 m3/km2 in the DRCA can increase 10%.(2)In the north of Shaanxi,the sediment reduction is mainly attributed to the dam and reservoir engineering,the DRCA of 50 000 m3/km2 can increase 10% in trap efficiency;the DRCA should be more than 60 000 m3/km2 if the sediment reduction effect of the comprehensive watershed control of soil and water conservation achieves 20%.(3)In the areas with high and coarse sediment yield of middle reaches of Yellow River,if the sediment reduction effect reaches 40%,the DRCA should excess 160 000 m3/km2.

对黄河中游河龙区间晋西北片、陕北片坝库控制面积占比、坝库单位面积库容等参数与水利水土保持措施减沙效益关系进行了研究,结果表明:(1)晋西北片若没有坝库工程,仅靠水土保持坡面治理措施只能取得14%的减沙效益;每增加100 km2的坝库控制面积,即可提高2%的减沙效益;每增加400万m3的库容,即可提高1%的减沙效益;坝库单位面积库容每提高1万m3/km2,减沙效益即可提高约10%。(2)陕北片减沙效益主要由坝库工程产生。减沙效益提高10%,坝库单位面积库容需要提高5万m3/km2。要使流域水土保持综合治理减沙效益达到20%以上,坝库单位面积库容应在6万m3/km2以上。(3)在黄河中游多沙粗沙区,要实现40%左右的减沙效益,坝库单位面积库容应达到16万m3/km2以上。

 
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