干旱

The increase of phosphoric fertilizer could offset the harm of drought stress on plant upgrowth and metabolize active and enhance output and water use efficiency of plants.

施磷肥在一定程度上弥补了干旱胁迫对植株生长发育及代谢活性所造成的伤害，并最终表现在显著提高了产量和水分利用效率。

the exploitation of upland of red soil has been restricted by drought.

干旱严重制约了红壤旱地的开发利用。

Because of the regional difference of soil and climatic conditions, the division of 4 stages of soil moisture circulation is not all the same between different areas; the soil moisture dynamics between different dry farming areas in the Yellow River Basin is contrasted in this report. The results indicate that soil moisture increases gradually from dry semi-arid area to semi-arid area, dry semi-humid area and semi-humid area, and the high value district generally appears during soil moisture resuming period in rainy season or soil melting period. While the low value district appears at the stage of fast evaporation in spring or slow evaporation in autumn; in views of vertical changes of soil moisture, it is showed that the variation range of upper lays is larger than that of lower among the different dry farming areas in the Yellow River Basin.

由于各区域之间土壤、气候条件的差异，各地土壤水分循环4个阶段的划分也不尽相同；黄河流域不同旱作类型区土壤水分动态变化比较结果表明：就季节变化而言(来源：A70b0B0bC论文网www.abclunwen.com)，由半干旱偏旱区→半干旱区→半湿润偏旱区→半湿润区土壤水分含量呈逐渐增加的变化趋势，而且高值区一般出现在雨季恢复阶段或春季土壤融冻返浆时期；而低值区均出现在春季大量蒸发阶段或秋季缓慢蒸发阶段；就垂直变化而言，黄河流域不同旱作类型区土壤水分垂直变化的趋势均表现为上层变化幅度较下层大。

The basin is one of the Cenozoic rift basins, which has experienced a series of paleo-climate change since Early Pleistocene, including wet cold, wet-warm, and arid. A former lake was believed to develop at the early stage of late Pleistocene (around 120 ka BP), and vanish during the Holocene. With the vanishment of the lake, the early Yellow River occurred. It results in a complex sedimentary environment with fluvial and lacustrine sediments interlacing each other.

河套盆地是一个新生代断陷盆地，自更新世早期以来经历了由湿冷-湿冷/暖-全新世干旱的古气候变化，盆地的发展经历了湖泊全盛期-收缩期-消亡期-河流发育期，沉积环境演化为湖积/河积交错沉积。

There were so huge roots and rhizome system under ground that they could absorb water from deep soil; Stems and leaves on ground could decrease water loss. The huge biomes of G.uralensis had strong drought resistance superiority. In the same time, drought stress significantly restrained the growth of G.uralensis. On the contrary, in some extent, drought stress could improve the growth of roots under ground and resulted in increasing the rate of root/shoot; moreover, made the color of velamen become red and enhanced the output and the quality.

主要结论如下：(1)在形态与生长反应方面，观察发现甘草地下和地上两部分都具有适应干早环境的特征，地下有庞大的根和根茎系统，吸水能力很强，地上茎叶形态表现出很强的节水能力，并且甘草群体抗旱优势很强；同时也观测到干旱对甘草地上茎叶生长抑制较为明显，但在一定程度上对地下根系生长起到了促进作用，导致根冠比增大、根皮颜色变红，即在产量和质量方面都有了很大地提高。

In the process of the drought stress, strawberrys relative conductance rate andMDA content are constantly increase, but it reduced under 5—20mmol/L Ca~(2 ) test,which release the membrane lipid peroxidation and protect the cell velum.

在干旱胁迫过程中，草莓叶片电导率和MDA含量是不断上升的，而在5—20mmol／L钙处理下，降低了草莓叶片质膜透性和MDA含量，减轻了膜脂过氧化，保护了细胞膜。

The environmental factors involved in flowering induction, such as photoperiod changes, vernalization, and drought, affect ABA levels.

影响植物成花调控的环境因子，包括光周期变化、春化作用、干旱等均会导致植物体内ABA代谢的变化。

In this paper, on the basis of a brief introduction of cotton enzymatic antioxidant system, the research progress on enzymatic antioxidant system response to different stresses, such as drought, salt injury, verticillium and so on, in recent years were reviewed.

本文试图以对棉花的酶促抗氧化系统的简单介绍为基础，综述棉花酶促抗氧化系统对干旱、盐害和黄萎病等逆境胁迫的生理响应的研究进展，分析目前相关研究中存在的问题及其研究前景。

This experiment used gramineous C_(4) plant vetiver,Vetiveria zizanioides as material to study the changes of photosynthetic characters and physiological indices under constant heat and drought stress.

研究了持续高温干旱胁迫条件下禾本科C4植物香根草的光合特性和几种生理指标的变化。

In order to avoid intercross and keep the fine properties,the voile bag would be covered on the selected fine individual plant before blooming.

木豆叶片是草食家畜极好的饲草，特别是在半干旱热带地区鲜饲草缺乏的季节更是如此。

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。