4亿多年前，植物第一次向海岸上迁移时，陆地上荒凉而贫瘠，并非生命宜居之地。
When plants first made the transition ashore more than 400 million years ago, the land was barren and desolate, inhospitable to life.
人们甚至可以未经许可就对植物或无脊椎动物进行迁移，只要它们未被归类为有害动植物。
People aren't even required to seek permits to move plants or invertebrate animals around as long as they are not classified as pests.
当鸟类迁移，它们所捕食的昆虫，或是作为食物的各类植物却仍留在原处，这就有可能会扰乱当地数千年未曾改变的生态系统。
When birds move, the insects or plants they eat often do not, possibly upsetting ecosystems unchanged for thousands of years.
过去，植物一直保持与气候同步，在上次冰河期解冻之后，给了它们许多时间让它们迁移。
In the past, plants have kept pace with the climate and after the last ice age thawed had lots of time to migrate.
如果跟不上逃避全球变暖影响所需的迁移速度，那些动植物有可能会灭绝。
Those unable to match the migration speeds needed to escape the effects of global warming could vanish into extinction.
当然，夏威夷群岛的自然环境—适宜的气候，充沛的降雨，肥沃的土壤都为迁移来的动植物的生长及繁衍创造了良好的条件，从而引发了上面的问题。
Much of the problem has to do with the nature of the islands themselves. Their moderate climate, plentiful rainfall, and fertile soil cause most immigrants to live long and prosper.
这是一种测量方法——测量温度带随全球变暖在地面移动的速度，以及动植物随后迁移所需速度。
This is a measure of how fast temperature zones are moving across the landscape as the planet warms - and how quickly plants and animals will need to migrate to keep up.
每当人们迁移到一个新地方，他们常常破坏许多野生植物。
When people move into a new place, they often destroy many wild plants.
这确定了它们对水中植物和动物生命的影响，也影响它们的迁移和停留。
It determines their effect on the plant and animal life in the water and affects their transportation or immobilization.
在分块研究的基础上，进行了水—土壤—植物—近地表大气尘间元素的迁移转化及环境健康效应研究。
Based on the research of above, the thesis studies element transfer in the system of water -soil -plants -air dust.
利用放射性同位素示踪技术，研究14C菲在“植物火山石营养液空气”封闭系统中的迁移转化。
The transportation and transformation of 14 C phenanthrene in a closed 'plant lava nutrient solution air' chamber system was studied by using radioactivity technology.
本文研究了在垂直电场条件下重金属络合物在土壤中的迁移过程以及植物吸收效应。
This thesis investigated the migration of metal-complexes in soil column and plant uptake of soil Cu and Zn through use of vertical electrical field.
许多植物需要向北部和向太平洋沿岸迁移以适应温度的上升和雨量的变化，另有一些植物可能会在高山上寻找它们喜欢的凉爽环境。
Many could move northward and toward the Pacific coast in reaction to rising temperatures and changes in rainfall. Others might climb up mountains to find the cooler climates they like.
同位素稀释分析是研究氮素在土壤植物体系中转化和迁移特征的有效方法。
Isotope dilution analysis is a valid approach for studying nitrogen transformation characteristics in soil-plant systems.
它们还随着季节的变化而在各种类型植物之间迁移，以便吃那些…
They moved seasonally among various vegetation types to feed on plants that were flourishing.
野葛和臭椿这样的非本土植物，它们就是从其他国家迁移而来的，现在已经给北美的生态系统造成了极大的威胁。
Discusses non-native plants, such as the kudzu vine and the tree-of-heaven, which were imported from other countries and now pose a significant threat to the ecosystems of North America.
通过对苗期玉米的盆栽试验，探讨了在镉、锌污染土壤上施入不同量的有机肥并配合淋洗措施后土壤中镉、锌的形态转化、迁移规律和对植物生长的影响及改良效果。
This paper reports the amelioration of soils polluted by Cd and Zinc by organic matter and water leaching in a pot experiment using corn seedling as an index crop.
有趣的是，迁移至植物核内的内共生蛋白会变得比蓝藻直系同源还要大。
Interestingly, endosymbiotic proteins that migrated to the plant nucleus became larger than their cyanobacterial orthologs.
那些能够迁移的栖息地需要以每年一公里的速度迁移，这意味着许多生长较慢的植物无法跟上这个速度。
Those habitats that can migrate are expected to do so at rates of up to one kilometre a year, meaning that many slower growing plants can't keep up.
通过现场加富培养实验的方法对长江口邻近海域海水营养盐对浮游植物生物量及浮游植物种类组成的影响，浮游植物对营养盐的迁移转化进行了研究。
A study was conducted to investigate the influence of nutrient to the biomass and the structure of species and the transformation of nutrient by phytoplankton in Changjiang Estuary and adjacent areas.
它们还随着季节的变化而在各种类型植物之间迁移，以便吃那些茂盛的植物。
They moved seasonally among various vegetation types to feed on plants that were flourishing.
这种同步迁移现象无疑具有重要的生态学和行为学意 义，表现出“天敌—寄主—植物”不同营养层之间的相互作用。
The phenomena shows that the interaction between different trophic levels of natural enemy-insect and pest-plant is undoubtedly of important ecological and behavioral significance.
这种同步迁移现象无疑具有重要的生态学和行为学意 义，表现出“天敌—寄主—植物”不同营养层之间的相互作用。
The phenomena shows that the interaction between different trophic levels of natural enemy-insect and pest-plant is undoubtedly of important ecological and behavioral significance.
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