干旱

Photosynthesis and anti-oxidase activity of Paeonia suffruficosa leaves during bud growing stage were studied under drought stress.

以现蕾期的盆栽牡丹叶片为试材，研究了中度干旱胁迫下牡丹叶片光合作用和抗氧化酶活性的变化。

Modified by the Tibetan and Pamir Plateau and the peripheral mountains, the inner China and the Tarim Basin experienced continuous aridification and desertification.

随高原和周边山地的隆升，中国内陆和塔里木盆地持续干旱化和沙漠化，沙漠逐步扩大至今天规模。

A relative low lake level between 8660～6010 cal.yr BPwas reflected by the clayey silt sediment with the median size less than 25μam and the sandcontent less than 4%,and the Pediastrum concentration was normally low.Between 6010 and2250 cal.yr BP,the median size and sand content increased greatly,and the Pediastrumconcentration raised sharply,suggesting a relative low lake level.After 2250 cal.yr BP,boththe median size and the Pediastrum abundance abruptly declined,suggesting the lake returnedto high level and the climate changed to humid.

UG04孔硅藻记录重建的湖泊水位变化基本上支持孢粉重建的古植被和古气候：8660～7230 cal.yr BP硅藻组合以浮游类主导，浮游／底栖比达40以上，指示水位较高，气候略湿润；7230～2330 cal.yr BP浮游类硅藻丰度和浮游／底栖比降低，湖泊处于低水位，气候干旱；2330～930 cal.yr BP浮游类硅藻丰度和浮游／底栖比增加，湖泊水位升高，气候湿润。

With different concentrations of polyethylene glycol (PEG6000), the treatment of water stress was simulated: With the decrease of water porential, the germination percentage, speed and index decreased in total and increased at the temperate water stress (-0.2MPa), indicating that A. pedunculata Pall. has drought tolerance in certain extent.

用不同浓度的PEG6000模拟土壤干旱对种子萌发进行人工水分胁迫处理，随着水势下降，种子发芽率、发芽速度、发芽指数及发芽活力呈下降趋势，在轻度水分胁迫下(-0.2MPa)发芽率有所上升，表明长柄扁桃具有一定的抗旱性。

With different concentrations of polyethylene glycol (PEG6000), the treatment of water stress was simulatedWith the decrease of water porential, the germination percentage, speed and index decreased in total and increased at the temperate water stress （-0.2 MPa）,indicating that A. pedunculata Pall. has drought tolerance in certain extent.

用不同浓度的PEG6000模拟土壤干旱对种子萌发进行人工水分胁迫处理，随着水势下降，种子发芽率、发芽速度、发芽指数及发芽活力呈下降趋势，在轻度水分胁迫下（-0.2 MPa）发芽率有所上升，表明长柄扁桃具有一定的抗旱性。

The response of gas exchange parameters such as net photosynthesis rate, transpiration rate, water use efficiency of leaf, stomatal conductance and intercellular CO2 concentration of 2-years old Periploca sepium Bunge to different soil water content were studied in Loess Plateau with CIRAS-2 portable photosynthesis system.

在半干旱黄土丘陵区，采用CIRAS-2型光合作用系统，在不同土壤水分条件下，对2年生杠柳的净光合速率、蒸腾速率、叶片水分利用效率、气孔导度和胞间CO2浓度等叶片气体交换参数的日变化进行了研究。

On PDA plate, colonies grow rapidly to 12.5~37.2 mm/21d, phialide discrete, arising solitary from the aerial mycelium, septated at the base or middle, hyaline, smooth, 14.9~23.2μm long, 1.9~3.1μm at base, tapering to less than 1.0 μm at tip; conidia hyaline, reniform to elliptical, bulk is (4.6~5.9)μm×(2.1~3.4)/lm. These morphological characteristics are significantly different from the well-described Neotyphodiurn species. Their phylogenetic relationship remains further researches.

ciliaris12株Neotyphodium属真菌为材料，详细研究了我国干旱地区Neotyphodium属真菌的形态学特征：在PDA平板上生长很快，21 d生长12.5~37.2 mm；分生孢子梗长14.9~23.2μm，基部宽1.9~3.1μm，顶端小于1μm，通常基部或近基部有隔膜；分生孢子无色透明，卵圆形或肾形，单个顶生，(4.6~5.9)μm×(2.1~3.4)μm，与其它已知Neotyphodium属真菌形态差异显著，需要进行更深入的研究。

Effects of drought stress on the membrane injury and photosynthetic characteristics in the leaves of Photinia frasery Dress were studied.

对不同程度干旱胁迫下红叶石楠的叶片膜伤害和光合生理特性进行了研究。

The results showed the relative water content, chlorophyll and carotonoid contents and net photosynthetic rate in leaves of Photinia frasery decreased with aggravation of drought stress, while the content of anthocyanin, Malondialdehyde and the membrane permeability inhanced significantly.

结果表明，随着干旱程度的增加，叶片含水量、光合色素含量以及净光合速率等生理指标都有不同程度的下降，而花青素含量、丙二醛含量和细胞膜透性大幅增加。

The results showed that:1. Changes of Photosynthesis and Relative Physiological Characteristics of Photinia frasery Dress Seedlings under Different Drought in SpringAlong with the stress time extended and stress extent increased, leaf water content, photosynthetic pigment content and photosynthetic indexes of Photinia frasery Dress were inhibited in different levels, but the anthocyanin content, MDA content and membrane permeability increased distinctly.

结果表明： 1。不同程度干旱胁迫下红叶石楠叶片光合作用及相关生理特性的变化随着胁迫时间的延长和胁迫程度的加剧，红叶石楠的叶片含水量、光合色素含量以及Pn等光合基本指标都受到了更深程度的抑制，且可利用的光强范围越来越小，而花色素苷含量、MDA含量和细胞膜透性大幅增加，保护酶系统(SOD、POD、CAT)活性随着胁迫时间的延长，总体表现为先升高后降低，但在同一时期，随着胁迫程度的加剧，酶活的变化趋势有异。

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