干旱

Under field continuous drought stress, growth rate, branches of stolon, leaf lengthobviously declined, nevertheless, leaf water content increased and MDA content decreasedsignificantly during field water deficit. SOD activity of the four turf grasses increased at thebeginning of water deficit and then decreased with drought stress. POD activity ofAugustinegrass increased rapidly and then kept stable with water deficit, however, PODactivity of Centipedegrass changed indistinctively.

田间持续干旱下，随干旱时间的延长，钝叶草和假俭草匍匐主茎的生长速率、主茎分枝数以及叶片长度显著(P＜0.05)下降；叶片含水量呈上升趋势；叶片MDA含量呈下降趋势(P＜0.05)；叶片SOD活性总体上呈先上升后下降趋势，但德阳假俭草和宫崎钝叶草峰值出现较早；钝叶草叶片POD活性先上升(P＜0.05)后趋于稳定，而假俭草叶片POD活性变化不显著；四个草坪草叶片CAT活性先下降(P＜0.05)后趋于稳定。

Effects of repeated cycles of dehydration\|rehydration on gas exchange and water use efficiency were studied in one\|year\|old jack pine Pinus banksiana Lamb.

该文研究了多重复干旱循环对1年生北美短叶松和黑云杉苗木的气体交换速率及水分利用效率的影响。结果表明，多重复干旱循环对它们的气体交换有显著影响（P＜0.5），而对其水分利用效率影响不大（P＞0.1）。

In soil drying development, the relationship between the soil layer water storage and the cumulative relative water loss was expressed reliably as a logarithmic linear equation.

干旱过程中，土层贮水量和累积相对失水量之间的关系可以用对数线性方程表示，将方程的斜率转换为取值在[0，1]区间的指数D，可以定量表达土壤干旱程度。

1Arid-subarid palaeoclimate was helpful for mechanical weathering of source rocks and torrent forming;(2) The combination of source rocks and their occurrence were liable to cause mechanical breakdown of rocks and form mudflow,(3)There was a considerable height difference along the border of the basin,(4) The density of subaqueous mudflow was 2.4-2.7g/cm3;(5)There was a high rate of accumulat...

认为本区沙三段时期满足重力流的形成条件，主要表现在六个方面：(1)干旱-半干旱的气候环境有利于母岩的机械风化和山洪的形成；(2)母岩的组合及其产状容易发生机械破碎，形成泥石流；(3)盆地边缘地形高差悬殊；(4)高密度的水下泥石流；(5)堆积速率大；(6)水深位于半深湖以下。

In the end the influencing factors and the occurrences of drought disaster are compared and analysed, for example, precipitation, temperature, the El Ninon year, SOI , sunspots, surface runoff low season.

简要对比分析了陕西干旱灾害的影响因子，如降水及气温、厄尔尼诺事件、南方涛动指数、太阳黑子、地表径流等与陕西干旱的关系。

Nostoc flagelliforme is a kind of terrestrial filamentous nitrogen-fixing cyanobacterium distributing in arid and semiarid region of north-western China.It has a great economic and ecological value.So its fundamental study and application study for protection and development have been studied in different ways.

发菜是一种固氮陆生蓝藻，我国主要分布于西北干旱半干旱荒漠草原地带，具有重要的经济和生态价值，围绕发菜资源基础研究和保护开发的应用研究已广泛开展。

In view of the poor natural conditions and inefficient agriculture, solely increasing numerator is far from enough.

我省70%以上的人口都是农民，70%以上的农村又属于干旱半干旱山区，自然条件差，农业效益低，仅仅在"扩大分子"上做文章是远远不够的。

The results show : a moderate drought, increased activity of SOD, and the drought will cause excessive SOD activity or decreased active oxygen scavenger. Oxalis corymbosa reflected a higher foreign species protected activity, which is consistent with a strong ability to invasion.

实验结果表明：在适度的干旱下，SOD活性有所上升，而过度的干旱则会使SOD等活性氧清除剂活性或含量下降，反映了外来物种铜锤草有更高的保护酶活性，这与其较强的入侵能力是一致的。

Doubtlesly, grassland degradation will influence herdman's production activity and the development of pasturing area economy.

草地资源是我国干旱半干旱地区生态安全的重要屏障，也是草地畜牧业发展的重要物质基础。

With the drought stress, proline content increased remarkably at the beginning and placidly in the evening.

3，干旱胁迫下，脯氨酸含量在干旱胁迫刚刚出现就迅速猛增，此后很快达到较高水平，随后增长放缓。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了