干旱

And water stress brought flowering time forward, although it was not significant, while the number of flowers per plant was increased significantly by water stress. The process of blooming in Bidens pilosa L.

结果表明，水分胁迫对三叶鬼针草的开花时间有提前的趋势，但是不显著；而对单株花序数量影响显著，表现为干旱造成三叶鬼针草单株花序数量升高。

On the contrary, the leaf grown in the non-Karst area was bifacial, with loosely arranged mesophyllous cells and an undeveloped vascular system.

岩溶区扇叶铁线蕨特有的显微和亚显微结构保证了该种植物在岩溶干旱环境中可以正常生长。

But in the dry grazing lands of the West,that familiar bluejoint grass was often killed by drought.

而西部牧场的气候往往干燥，干旱往往会导致草的死亡。

The results showed that clay mineral of the sedimentary core B106 reveal seven palaeoclimate events since 16725 Cal.aBP, such as"Bolling Warming Events"in 13100±45 aBP,"Younger Dryas Cooling Events"in 10393±45 aBP,"Early Holocene Cold Event"in 8000aBP,"South of China Cooling Events"in 4624±35 aBP, Cooling Events in 3370±40 aBP, Drought Incident Cooling Events in 922BC and"Cooling Events of Northern and Southern Dynasty"in 514AD.

研究结果显示，B106柱的粘土矿物学指标指示出16725 Cal.aBP以来的7次古气候变化事件，分别是13100±45 aBP的&博林暖期升温事件&、10393±45 aBP的&新仙女木降温事件&、8000 Cal.aBP对应的&全新世最大降温事件&、4624±35 aBP的&中国南方降温事件&、3370±40 aBP的降温事件、922BC的干旱降温事件和514 AD的&南北朝降温事件&。

Seed vigor and drought resistance of three perennial forages belong to Bromus (Bromus ciliatus, Bromus inermis, Bromus ircutensis) in the period of seed germination were compared under PEG-6000 of different levels drought stress.

用不同浓度的PEG-6000溶液模拟干旱胁迫，比较雀麦属3种多年生牧草（缘毛雀麦、无芒雀麦、沙地雀麦）种子萌发期的种子活力与抗旱性。

Through cultivating five cold-season turfgrass (Lolium perenne,Agrostis stolonifera,Festuca rubra,Festuca arundinacea,Bromus inermis) in basin,their drought to lerance indexes,including the planting height,the root growth,the relative water content of leaves,the penetration of membrane,were comprehensively evaluated to compare their drought tolerance.

中文摘要：采用盆栽育苗法，在5种冷季型草坪草苗期连续干旱胁迫下测定植株高度，根系生长，叶片相对含水量和质膜透性等抗旱指标，以综合评价5种冷季型草坪草的抗旱性能。

It was concluded that Glomus mosseae inoculation improved the drought resistance of Broussonetia papyrifera Vent, especially in moderate stressed conditions. And the contribution of AM symbiosis to plant to avoid the stress or to increase its tolerance might be the result of modification of root morphology and fractal character.

由此作者认为，接种G.mosseae在不同土壤水分条件下促进了构树幼苗的生物量积累，这种促进作用在土壤干旱条件下尤为明显，表明AM菌根真菌G.mosseae提高了宿主构树的抗旱性；G.mosseae对宿主构树抗旱性的提高与G.mosseae对构树根系形态特征、分形特征的改变密切相关。

Seedlings of one-year-old Broussonetia papyrifera L. were subjected to the drought stress of soil under different moisture conditions. The injury degree of cell plasma membrane and the correlative enzyme activity of plasma-membre protection system in the leaves of the seedlings were studied. Their relative conductivity, MDA content and activities of superoxide dismutase, catalase and peroxidase were measured.

以盆栽当年生构树幼苗为实验材料，研究不同程度土壤干旱胁迫下及复水之后构树叶片细胞质膜的伤害程度、丙二醛含量和其酶促抗氧化保护系统（超氧化物歧化酶SOD、过氧化氢酶CAT和过氧化物酶POD）的活性。

The Caatinga is one of the most populated semi-arid regions in the world and its human occupation dates back to pre-historic times.

caatinga该是一个最稠密的半干旱地区，在世界上与人的职业可以追溯到史前时代。

The Caatinga is a semi-arid scrub forest situated in the northeast of Brazil.

caatinga的是一个半干旱丛林位于东北部的巴西。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。