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   vegetable ecosystem 的翻译结果: 查询用时:0.189秒
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vegetable ecosystem
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  “vegetable ecosystem”译为未确定词的双语例句
     One is the theoretical gist of the goals of vegetation reclamation in the Northwest of China. The second is diversity of vegetation and heterogeneity of landscape. The third is selfrenewing and cycling of vegetable ecosystem.
     文章从生态学基础角度,反观近50年来的生态建设,对西北地区植被建设目标的理论依据、植被的多样性和景观的异质性、植被生态系统的自我恢复与循环、植被类型的空间分异等4个方面做了初步论述,以期对西部大开发中的新一轮生态建设有所参考。
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  相似匹配句对
     ecosystem
     生态系统
短句来源
     Study on the residue dynamics of fipgonil in vegetable-field ecosystem
     锐劲特在菜地生态系统中的残留动态研究
短句来源
     Beauty of Ecosystem
     发现生态之美 柯城林业生态摄影作品选
短句来源
     CONFIDENTIAL VEGETABLE
     私房菜小窥
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     2 vegetable;
     植物状态 2例 ;
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The species diversity of weeds community of vegetable ecosystem is high in Xiangtan suburb fallow during winter season. Based on the total of the plots ,18 species which belong in 10 family, 15 genus were found. The result of diversity index is: the richness index is 9-15; the Simpson index is 0 6401-0 7451; the Shannon-Wiener index is 1 4852-1 7000; the evenness index is 0 5791-0 7145.The results show that the farther the vegetable plot is from city, the higher the species diversity is.

对湘潭市郊菜地生态系统冬季期间杂草植物群落的物种多样性进行了初步研究 .共出现 18种 ,分属于 10科 15属 .物种丰富度为 9- 15 ;Simpson指数为 0 .6 40 1- 0 .74 5 1;Shannon -Wiener指数为 1.4 85 2 -1 70 0 0 ;均匀度指数为 0 .5 791- 0 .714 5 .结果表明 :离市中心越远 ,物种多样性程度越高

The diamondback moth (DBM), Plutella xylostella (L.), is an important, damaging insect of cruciferous crops worldwide and has become the most serious insect pest on crucifers in South China where the frequency of outbreaks has increased rapidly since the 1970s. The diamondback moth feeds only on cruciferous crops and its host preference is related to concentrations of mustard oils and glucosides in crucifers. Although all members of the family Cruciferae can serve as host plants certain species of crucifers...

The diamondback moth (DBM), Plutella xylostella (L.), is an important, damaging insect of cruciferous crops worldwide and has become the most serious insect pest on crucifers in South China where the frequency of outbreaks has increased rapidly since the 1970s. The diamondback moth feeds only on cruciferous crops and its host preference is related to concentrations of mustard oils and glucosides in crucifers. Although all members of the family Cruciferae can serve as host plants certain species of crucifers are pre-eminently suitable as DBM hosts as they improve population survival rate and adult fecundity. The life table method is effective and is often used to analyze and evaluate the effect of environmental factors such as rainfall, predators and parasitoids on diamondback moth populations. In order to objectively and quantitatively assess host suitability of crucifers to the diamondback moth, the four most important crucifers grown in Guangdong Province, South China, flowering Chinese cabbage, Chinese kale, leaf mustard and Pak-choi, were selected as the survey host crops. In our study these four crops were planted at the same time, in plots of 1/30 hectare, respectively. The life tables of DBM on each crop were constructed based on both the data of systematic surveys of DBM populations in the field and population parameters estimated in the laboratory. The survey was conducted at two-day intervals from mid April to the end of May 1997, in a suburb of Shenzhen city, Guangdong, South China. At least 20 units containing about 0.11 square meters of crops were sampled randomly in every crop every 2 days. The numbers of all stages of DBM and its natural enemies were recorded systematically and a certain number of DBM eggs, larvae and pupae were taken back to the Lab to estimate the parasitism, death rate and fecundity of females. The results are as follows.Among the four crops, leaf mustard seems the most preferable host for the adult of DBM. The significantly higher numbers of DBM eggs on leaf mustard indicated that it can attract more adults and stimulate their oviposition. On one cropping cycle of each of the four cruciferous vegetables diamondback moth can complete two generations. However, the indices of population trend (I) of two continuous DBM generations show significant differences between the four crops. I-values of DBM on Chinese kale, Pak-choi, flowering Chinese cabbage and leaf mustard were 17.64; 11.90; 11.43; and 3.76, respectively. It could be concluded that Chinese kale provided the most suitable nutrients for the development and reproduction of DBM populations; therefore it was considered as the best host for DBM among the four tested crops. Leaf mustard, although one of the most preferred hosts for DBM adults was not as good as three other crucifers for DBM development due to higher natural death rates of larvae. However as a trap crop, leaf mustard can suppress the population of DBM in the vegetable ecosystem by its ability to attract DBM adults and lower the nutrient fitness of DBM larvae. Therefore, planting leaf mustard strips within other commercial crucifers can be considered as a realistic practice in the IPM of DBM.

利用作用因子生命表技术 ,组建芥菜、芥蓝、小白菜和菜心 4种十字花科蔬菜上小菜蛾自然种群连续世代生命表 ,分析寄主植物和生物因子对小菜蛾种群数量的控制作用。结果表明 :在 4种十字花科蔬菜的一造菜上 ,小菜蛾均能完成两个世代。虽然小菜蛾在芥菜上的初始卵量最高 ,但害虫种群总增长倍数在芥蓝上最高 ,其次为小白菜 ,菜心和芥菜 ,分别为 1 7.64、1 1 .90、1 1 .43和 3.76。这说明尽管芥菜对小菜蛾成虫的产卵有一定的吸引作用 ,但不适合小菜蛾生长发育。芥蓝是最适宜小菜蛾种群增长的寄主。生物因子在小菜蛾自然种群控制中起着重要的作用 ,但是在不同种类十字花科蔬菜上 ,天敌类群对小菜蛾控制作用存在一定差异。除芥菜之外 ,寄生性天敌对芥蓝、菜心和小白菜上的小菜蛾种群控制作用最大 ,其次为“捕食及其它”,病原微生物的控制作用最小。“捕食及其它”对芥菜上小菜蛾种群的作用非常明显 ,如果排除此因子作用 ,小菜蛾种群两代后将增长 1 2 6.0 3倍。该因子是导致芥菜小菜蛾自然种群增长趋势指数低的主要原因。因此在制定小菜蛾防治策略时 ,应考虑蔬菜的种类和布局 ,加大对芥蓝小菜蛾种群的防治力度 ;芥菜可作为一种诱...

利用作用因子生命表技术 ,组建芥菜、芥蓝、小白菜和菜心 4种十字花科蔬菜上小菜蛾自然种群连续世代生命表 ,分析寄主植物和生物因子对小菜蛾种群数量的控制作用。结果表明 :在 4种十字花科蔬菜的一造菜上 ,小菜蛾均能完成两个世代。虽然小菜蛾在芥菜上的初始卵量最高 ,但害虫种群总增长倍数在芥蓝上最高 ,其次为小白菜 ,菜心和芥菜 ,分别为 1 7.64、1 1 .90、1 1 .43和 3.76。这说明尽管芥菜对小菜蛾成虫的产卵有一定的吸引作用 ,但不适合小菜蛾生长发育。芥蓝是最适宜小菜蛾种群增长的寄主。生物因子在小菜蛾自然种群控制中起着重要的作用 ,但是在不同种类十字花科蔬菜上 ,天敌类群对小菜蛾控制作用存在一定差异。除芥菜之外 ,寄生性天敌对芥蓝、菜心和小白菜上的小菜蛾种群控制作用最大 ,其次为“捕食及其它”,病原微生物的控制作用最小。“捕食及其它”对芥菜上小菜蛾种群的作用非常明显 ,如果排除此因子作用 ,小菜蛾种群两代后将增长 1 2 6.0 3倍。该因子是导致芥菜小菜蛾自然种群增长趋势指数低的主要原因。因此在制定小菜蛾防治策略时 ,应考虑蔬菜的种类和布局 ,加大对芥蓝小菜蛾种群的防治力度 ;芥菜可作为一种诱杀植物种植 ,以吸引小菜蛾产卵 ,并集中防治。这些防治策略在小菜蛾综合治理中具有

The ecosystems in the northwest parts of China are flimsiness and the environmental pressure is high. Although many works have be done to reclaim the ecoenvironment in this region, the whole status of ecosystems and environment has not been improved ultimately. There are many causes of this result. After reviewing the ecological reconstruction in the latest fifty years, the paper represents four aspects of ecological foundation for vegetation reclamation. One is the theoretical gist of the goals of vegetation...

The ecosystems in the northwest parts of China are flimsiness and the environmental pressure is high. Although many works have be done to reclaim the ecoenvironment in this region, the whole status of ecosystems and environment has not been improved ultimately. There are many causes of this result. After reviewing the ecological reconstruction in the latest fifty years, the paper represents four aspects of ecological foundation for vegetation reclamation. One is the theoretical gist of the goals of vegetation reclamation in the Northwest of China. The second is diversity of vegetation and heterogeneity of landscape. The third is selfrenewing and cycling of vegetable ecosystem. The last one is the spatial variance of vegetation.

西北地区生态脆弱,环境压力大,虽然经过长期建设,整体状况并未得到根本改善。其中有主观和客观两方面的原因。文章从生态学基础角度,反观近50年来的生态建设,对西北地区植被建设目标的理论依据、植被的多样性和景观的异质性、植被生态系统的自我恢复与循环、植被类型的空间分异等4个方面做了初步论述,以期对西部大开发中的新一轮生态建设有所参考。

 
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