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herb cover
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  草本盖度
     The predictive model could be expressed well by the following equation:Ln[P/(1-P)]=-3.938+0.083×degree of slope+0.037×tree cover+0.116×tree height-0.003×herb cover (P was the probability of the occurrence of C.crossoptilon Populations roosting-site).
     通过逻辑斯蒂回归建立白马鸡群体夜栖地选择的预测模型。 该模型的数学表达式为Ln[P/(1 -P) ]=- 3 938+0 0 83×坡度 +0 0 37×乔木盖度 +0 1 1 6×乔木高度 - 0 0 0 3×草本盖度 (P为白马鸡群体夜栖地的出现概率 )。
短句来源
     The whole year sediment amount of 3 herb vegetation types,3 shrub vegetation types and 3 arbor vegetation types has an opposite tendency with each herb cover degree, respectively. That is to say, the more of cover degree of herb,shrub or arbor vegetation, the less of sediment amount .
     草本、灌木、乔木植被类型的年土壤侵蚀量和3种植被类型中的草本盖度表现出相反的趋势,即草本盖度越高的草本、灌木或乔木植被类型,年土壤侵蚀量越低。
短句来源
     Results show that distance to nearest water, shrub cover, shrub height, wood cover, wood height, wood diameter at breast height and herb cover are significantly different between active and inactive plots(Mann-Whitney U test, P<0 05). Three new variables are introduced after the transformations. They are also significantly different between active and inactive plots(Mann-Whitney U test, P<0 05).
     结果表明 :距水源距离、灌木盖度、灌木高度、乔木盖度、乔木高度、乔木胸径和草本盖度等变量在遇见样方与未遇样方间呈显著差异 (P <0 0 5 ) ,数据转换后引入的 3个新变量亦呈显著差异 (P <0 0 5 ) ;
短句来源
     The occurrence of the roosting sites was positively related to degree of slope,wood cover and wood height,and negatively related to herb cover.
     白马鸡群体的夜栖地选择与坡度、乔木盖度和乔木高度正相关 ,与草本盖度负相关。
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  “herb cover”译为未确定词的双语例句
     Herb cover and arbor cover maybe the main factors influenced patch size and patch shape, and the arbor cover maybe influenced quality of the patch.
     影响斑块大小、形状的主要因素为斑块上方草本层盖度,但乔木层盖度可能影响到苔藓斑块的质量。
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  相似匹配句对
     Herb.
     Herb.
短句来源
     Lycoris Herb.
     石蒜属(Lycoris Herb.)
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     COVER STORY
     封面的故事
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     Cover Browse
     封面浏览
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     Study on draught resistance of five herb ground cover plants
     5种草本地被植物抗旱性研究
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  herb cover
Herb cover was most strongly influenced by soil moisture.
      
It seems that the herb cover of logs does not hinder the regeneration of spruce.
      
The herb cover is distinctively dominated by Vaccinium myrtillus.
      
The increased amount of the light at ground level resulted in increased herb cover.
      
Ground herb cover, density and species-richness were higher in the lower montane forest plots.
      
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Through the study of plot runoff resource,3 herb vegetation types,3 shrub vegetation types and 3 arbor vegetation types in loess hilly region,.The obtained results showed that shrub vegetation is the best,herb vegetation is medial,arbor vegetation is the worst in the function of reducing runoff.While shrub vegetation is the best, arbor vegetation is medial,herb vegetation is the worst in the function of reducing soil erosion.The whole year sediment amount of 3 herb vegetation types,3 shrub vegetation types and...

Through the study of plot runoff resource,3 herb vegetation types,3 shrub vegetation types and 3 arbor vegetation types in loess hilly region,.The obtained results showed that shrub vegetation is the best,herb vegetation is medial,arbor vegetation is the worst in the function of reducing runoff.While shrub vegetation is the best, arbor vegetation is medial,herb vegetation is the worst in the function of reducing soil erosion.The whole year sediment amount of 3 herb vegetation types,3 shrub vegetation types and 3 arbor vegetation types has an opposite tendency with each herb cover degree, respectively. That is to say, the more of cover degree of herb,shrub or arbor vegetation, the less of sediment amount .

通过对3种草本、3种灌木、3种乔木植被类型的小区径流资料分析研究,结果表明就减少径流损失作用而言,灌木作用最为明显,草本次之,乔木最差;就减少土壤侵蚀作用而言,灌木作用最为明显,乔木次之,草本最差;草本、灌木、乔木植被类型的年土壤侵蚀量和3种植被类型中的草本盖度表现出相反的趋势,即草本盖度越高的草本、灌木或乔木植被类型,年土壤侵蚀量越低。

Tongwancheng,the capital of the Great Xia Kingdom during the period of Five Hu and Sixteen Kingdoms in the Chinese history,was situated on the north bank of Wudinghe River in the north of Jingbian County,Shaanxi Province The recent Tongwancheng area has a desert landscape,with only sparse secondary shrub and grass community However,about 1600 years ago the Tongwancheng area was once a beautiful place of dry steppes with the landscape of sparse forest There was a temperate vegetation Forests of Platycladus...

Tongwancheng,the capital of the Great Xia Kingdom during the period of Five Hu and Sixteen Kingdoms in the Chinese history,was situated on the north bank of Wudinghe River in the north of Jingbian County,Shaanxi Province The recent Tongwancheng area has a desert landscape,with only sparse secondary shrub and grass community However,about 1600 years ago the Tongwancheng area was once a beautiful place of dry steppes with the landscape of sparse forest There was a temperate vegetation Forests of Platycladus orientalis were distributed on the hills and uplands Thermophilous trees grew along river banks and in gullies Abundant aquatic plants grew in rivers,lakes and swamps Salt loving shrubs and herbs covered the salinized soil At that time,the climate of the Tongwancheng area was as follows:the annual mean temperature was 7 8℃~9 3℃,the hottest monthly mean temperature was 23 0℃~24 9℃ and the coldest monthly mean temperature was -12 0℃~-5 6℃,the annual mean temperature difference was 28 5℃~38 2℃,the annual precipitation was 403 4~550 0 mm,the monthly maximum precipitation was 83 8~123 9 mm and the monthly minimum precipitation was 4 4~12 2 mm Compared with the present climate,the annual mean temperature and annual precipitation were respectively 0 2℃~0 7℃ and 60~100 mm higher It indicates that the climate in the Tongwancheng area about 1600 years ago was slightly warmer and wetter than the present time The similar vegetative landscape of dry steppes has moved southward The forests of Platycladus orientalis and forest steppe have moved to the southern part of Yan'an area It is estimated that the Mau Us Desert migrated southward at a mean rate of 125 meters per year during the past 1600 years

十六国时期夏国都城———统万城位于陕西省靖边县城北无定河北岸 ,今天的自然景观属于沙漠 ,仅存稀疏的次生灌丛和草本群落。但是 ,在约 16 0 0年以前 ,当地为温带干草原 ,在塬面或山丘上分布有侧柏林 ,沟谷、河岸边生长喜温湿的乔木 ,河流、湖泊、沼泽中水生植物繁盛 ,在丘间低洼处或盐碱土上分布有灌木和草本植物。当时该地区的年平均温度为 7 8℃~ 9 3℃ ,最热月平均温度 2 3 0℃~ 2 4 9℃ ,最冷月平均温度- 12℃~ - 5 6℃ ,年较差 2 8 5℃~ 38 2℃ ,年降雨量 4 0 3 4~ 5 5 0 0mm ,最大月降雨量 83 8~ 12 3 9mm ,最小月降雨量为 4 4~ 12 2mm。当时的年平均温度比现在高出 0 2℃~ 0 7℃ ,年降雨量也高出 6 0~ 10 0mm。如此的历史景观今天已经向南迁移 ,侧柏林或森林草原退缩至延安以南。在此近 16 0 0年的时间里 ,毛乌素沙漠分布范围不断扩大 ,其南部边缘推进了约 2 0 0km ,推测沙漠扩展的速率达到平均 12 5m/a。

The field surveys on the wintering habitat selection of White Eared-pheasant (Crossoptilon crossoptilon) flocks were carried out from Jan. to Apr. and from Oct. to Dec.2003 around Zhujie Monastery, Gewa village and Ranzi village in Sichuan province, China. Line transects of systemic sampling and random transects were used in the surveys. In the first survey in Zhujie Monastery, Mann-Whitney U test is applied to decide the variables with significant differences between active plots(presence of White Eared-pheasant)and...

The field surveys on the wintering habitat selection of White Eared-pheasant (Crossoptilon crossoptilon) flocks were carried out from Jan. to Apr. and from Oct. to Dec.2003 around Zhujie Monastery, Gewa village and Ranzi village in Sichuan province, China. Line transects of systemic sampling and random transects were used in the surveys. In the first survey in Zhujie Monastery, Mann-Whitney U test is applied to decide the variables with significant differences between active plots(presence of White Eared-pheasant)and inactive ones (absence of the species) (P<0.05). Some new variables are introduced by multiplying the variables presenting the vegetation types. Stepwise line regression is conducted with presence/absence(0/1)of the species as dependent variable and the above variables as independent ones, respectively. In the regression model, the independent variables with significant correlation are remained (t test, P<0.05). Results show that distance to nearest water, shrub cover, shrub height, wood cover, wood height, wood diameter at breast height and herb cover are significantly different between active and inactive plots(Mann-Whitney U test, P<0 05). Three new variables are introduced after the transformations. They are also significantly different between active and inactive plots(Mann-Whitney U test, P<0 05). The experiential model can be formally expressed. The equation has relatively high value of coefficient of determination and shows significant correlation(r 2=0.832, F=17.125, d f=4, P=0.000), and the independent variables also show significant correlation(t test, P<0 05). Shrub cover, shrub height, wood cover, wood height, wood diameter at breast and herb cover are insignificant and deleted(t test, P>0 05). The above model is tested in the second survey in three other study areas. The same data transformations, independent and dependent variables as those in experiential model are used to conduct the regression models for the 3 study areas, respectively. Finally, the obtained coefficients of independent variables are applied to predict the occurrence of the bird. The results show that 3 regression models all had relatively high values of coefficient of determination and are all significant correlation. The predictive values(0.5 as the cut-off point) are not significantly different from the observed ones(paired-samples t test, P> 0 05). The experiential model could well predict the habitat selection of White Eared-pheasant.

于 2 0 0 3年 1— 4和 10— 12月考察了四川省稻城县著杰寺、格瓦村、冉子村等地白马鸡(Crossoptiloncrossoptilon)群体的栖息地选择 .采用样线法进行系统取样或随机取样调查 ,通过Mann WhitneyU检验判定遇见样方 (有白马鸡出现 )和未遇样方 (无白马鸡出现 )间呈显著差异的环境变量 ,对这些变量进行数据转换 (同一类型的变量相互乘积 )并以它们为自变量 ,以白马鸡的出现赋值为 1或不出现赋值为 0为因变量进行逐步线性回归 ,结果中保留相关显著的变量 (t检验 ,P <0 0 5 ) ,从而得到白马鸡栖息地选择的经验模型 .结果表明 :距水源距离、灌木盖度、灌木高度、乔木盖度、乔木高度、乔木胸径和草本盖度等变量在遇见样方与未遇样方间呈显著差异 (P <0 0 5 ) ,数据转换后引入的 3个新变量亦呈显著差异 (P <0 0 5 ) ;回归等式的决定系数较高且回归相关显著(r2 =0 832 ,F =17 12 5 ,df=4 ,P =0 .0 0 0 ) ,各自变量也相关显著 (t检验 ,P <0 .0 5 ) ,而灌木盖度、灌木高度、乔木盖度、乔木高度、...

于 2 0 0 3年 1— 4和 10— 12月考察了四川省稻城县著杰寺、格瓦村、冉子村等地白马鸡(Crossoptiloncrossoptilon)群体的栖息地选择 .采用样线法进行系统取样或随机取样调查 ,通过Mann WhitneyU检验判定遇见样方 (有白马鸡出现 )和未遇样方 (无白马鸡出现 )间呈显著差异的环境变量 ,对这些变量进行数据转换 (同一类型的变量相互乘积 )并以它们为自变量 ,以白马鸡的出现赋值为 1或不出现赋值为 0为因变量进行逐步线性回归 ,结果中保留相关显著的变量 (t检验 ,P <0 0 5 ) ,从而得到白马鸡栖息地选择的经验模型 .结果表明 :距水源距离、灌木盖度、灌木高度、乔木盖度、乔木高度、乔木胸径和草本盖度等变量在遇见样方与未遇样方间呈显著差异 (P <0 0 5 ) ,数据转换后引入的 3个新变量亦呈显著差异 (P <0 0 5 ) ;回归等式的决定系数较高且回归相关显著(r2 =0 832 ,F =17 12 5 ,df=4 ,P =0 .0 0 0 ) ,各自变量也相关显著 (t检验 ,P <0 .0 5 ) ,而灌木盖度、灌木高度、乔木盖度、乔木高度、乔木胸径和草本盖度等变量相关不显著 (t检验 ,P >0 0 5 ) .在 3个乡的考察中对该经验模型进行了验证 ,采用同样方法进行数据变换 ,以与经验模型相同的自变量和因变量进行逐步线性回归 ,最后根据得到的各变量系数利用

 
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