刺槐

Ginkgo is more drought tolerant,and maintain relatively higher Pn under drought;Robinia pseudoacacia is less drought tolerant,and Pn decrease greatly under stress;Ailanthus altissima is placed in the middle.

耐旱能力较强的银杏在干旱胁迫下维持较高的光合作用；刺槐的抗旱能力最弱，光合速率下降幅度最大，臭椿居中。

At one time, we emphasized the solar radiation transfer mechanics. To advance the estimation precision, in this paper, we classed land cover into four layer, canopy of Robinia pseudoacacia L ,top of Melilotus albus Desr,bottome of Melilotus albus Desr and layer of soil, separately estimated their fluxes of moisture, heat and CO2 ,actualized the separated simulation for each composement in soil-vegetation-atmosphere contimuum.

同时，本次研究强调了太阳辐射在冠层间的辐射传输机制，为了提高估算精度，本文把地表覆盖分为刺槐冠层，草木樨上层、草木樨下层及土壤层四个层面来分别估算其水热及CO2通量，做到了土壤-植被-大气连续体能量及物质通量的分离模拟。

At last,We carry out stability asssessment about the vegetation in virtue of the model builded in this plot.We calculate the vegetation's ecological water requirement on May 2004: canopy of Robinia pseudoacacia L require 5.2mm, Top of Melilotus albus Desr require 32.2mm, Bottome of Melilotus albus Desr require 8.6mm, Layer of soil require 17.6mm, totalize 63.6mm,Which more 22.33 mm than the contemporaneous rainfull 41.27mm.

最后通过本次研究构建的模型对项目区植被进行了稳定性评价，计算出2004年5月份复合植被的生态需水量，分别为刺槐冠层5.2mm，草木樨上层32.2mm，草木樨下层8.6mm，土壤蒸发17.6mm，总计63.6mm，这个结果比当月的多年平均(1980-2002年)降雨量41.27mm多出了22.33mm.6月初白花草木樨收割以后，次生茬生长缓慢，我们假设草木樨没有被收割，分别计算了6月和7月的生态需水量，6月份生态需水为85.64mm，7月份为78.41mm，发现6月份水分亏缺依然严重，7月份降雨完全可以满足复合植被的蒸散需求。

The sixteen plants are firstly divided into six types according to evaluation grades and subject function statistical method:the first type is Cajanus cajan and Crotalaria mucronata,the best adaptability ,which can be used pioneer plant or constructive species; the second type is Cynodon dactylon,the better adaptability, which can be used constructive species ;the third type is Eragrostis curvula, Paspalam notatum,which can be used constructive species on rotten rock slope ; the forth type is kummerowia striata,Lotus corniculatus and Vitex negundo.The adaptability is centered,and can be used protection species and auxiliary species;the fifth type is Robinia pseudoacacia,Eremochloa ophiuroides,Vitex negundo,Lespedeza formosa,Leucaena leucocephala,Desmodium sequax, Rhus chinne- nsis,which can't be plant singly and be used accessory species;the sixth is Trifolium repens,which can be used pioneer plant.

根据评价边坡防护植物适应性的十个重要指标，首次运用隶属函数和聚类分析方法，对各供试植物的边坡适应性综合排序并分为六类：第一类为木豆和猪屎豆，边坡适应性最强，适宜作为先锋植物和建群种；第二类为狗牙根，边坡适应性强，适宜与豆科植物混播，作为建群种；第三类为弯叶画眉草和百喜草，边坡适应性较强，适宜与豆科植物混播，作为风化岩边坡的建群种；第四类为鸡眼草、百脉根和马棘，边坡适应性中等，适宜作为保护种与伴生种；第五类为刺槐、假俭草、荆条、美丽胡枝子、银合欢、波叶山蚂蝗和盐肤木，边坡适应性较差，不宜单独在边坡上种植，最好与速生型豆科草本混播，作为边坡防护植物群落的辅助植物；第六类为白三叶，边坡适应性最差，但因其出苗率高、生长速度快，作为先锋植物，起到前期覆盖坡面的作用。

Effects of three kinds antibiotics on induction and differentiation of blacust callus in vitro were studied.

方法］研究3种抗生素对宽叶刺槐愈伤组织诱导与分化的影响。

By taking one-year-old micropropagated K2, K3 and ordinary duplation black locust as study objects, the difference in drought resistance abilities among three clones were evaluated under stimulant natural drought and gradual drought of soil.

本实验设置了模拟自然干旱和土壤逐渐干旱两种处理，以普通二倍体刺槐为对照，研究了三个品种的一年生组培苗间与抗旱性相关的生理生化指标的差异。

Is divided into two systems of the root-hypocotyl-cotyledon and the epicotyl, and there is only a simple linkage between the vascular tissues of stem and the hypocotyl without any transition.

本研究亦证实了可以将刺槐幼苗的外部形态描述为这两个系统，二者的维管组织只是简单的连接，不存在过渡。

The boundary is the transition zone of material and energy between forestland and grassland.

界面是连接刺槐林和草地之间进行物质、能量交换的过渡区域。

The diameter at ground height,height and canopy width of genet are significantly larger than those of daughter ramets.

刺槐分株在幼年时期高生长和冠幅的生长均较快，当生长到一定的年龄逐渐缓慢下来。

It now varies from open grass plains in the south, savannahwith scattered acacia trees in the center, hilly, wooded grassland in the north, to extensive woodland and black clay plains to the west.

今天的塞伦盖蒂，南面是广阔的草原，中部是散生着刺槐的热带稀树草原，而北部是丘陵起伏、树木繁茂的草场，西部则是一望无际的森林和黑色粘土平原。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。