优势种

The background survey and tracking survey of artificial reef area in Chenghai Laiwu were carried out before and after reefing in 2003 and 2007, respectively. The results indicated that after the deployment of artificial reefs, the biomass density of fishery resources increased by 25.63 times, which were much higher than before. The resources species was much more abundant; total number increased from 23 to 41, which increased by 0.78 times. The crab resources sharply increased by 1.75 times after artificial reef were deployed. Harpodon nehereus and Portunus sanguinolentus , which did not appeared in background survey, now became the dominant species in tracking survey. There were high diversity indexes in artificial reefs area and control area in tracking survey. In conclusion, the results indicated that the fish-aggregating effect of artificial reef site has improved a lot, and the community structure and the habitat environment have been significantly improved.

摘 要：2003和2007年分别对澄海莱芜人工鱼礁区进行了投礁前的本底调查和投礁后的跟踪调查，结果表明，投礁后礁区海域游泳生物的资源密度明显比投礁前高，增加了25.63倍；礁区海域各类资源种类均比投礁前丰富，总种数由投礁前的23种增加至41种，比投礁前增加了0.78倍，其中，蟹类种数增加最多，增加了1.75倍；在本底调查中没有出现的经济种类龙头鱼 Harpodon nehereus 和红星梭子蟹 Portunus sanguinolentus 在跟踪调查中已成为主要优势种；Shannon-Wienver多样性指数在礁区和对比区均比投礁前有所增加。

We choose the arid land of northwestern China as our study area because of its extensive area, specific geographical location, dry climate, varied topography, vulnerable ecosystems and long-term human disturbance, as well as the existence of current conflicts between economic development and environmental protection. Based on the literature, we choose ten desert species with clear and relatively accurate geographical distribution ranges to model their distributions:Anabasis brevifolia, Atraphaxis frutescens, Calligonum mon-golicum, Ephedra przewalskii, Gymnocarpos przewalskii, Haloxylon ammodendron, Haloxylon persicum, Ka-lidium cuspidatum, Salsola laricifolia, and Sympegma regelii.

：选择面积广阔、地理位置特殊、气候干旱、地形地貌多样、生态系统脆弱以及人类活动长期干扰，而且目前面临着西部大开发和环境保护双重矛盾的西北干旱区作为研究区域，通过收集西北干旱区多种优势种和常见种的地理分布资料，选取10种分布范围相对明确、资料相对齐备的荒漠植物种：短叶假木贼、木蓼(A- traphaxis frutescens)、沙拐枣、膜果麻黄、裸果木、梭梭柴、白梭梭、尖叶盐爪爪、松叶猪毛菜(Salsola lar- icifolia)和合头草，定量分析其地理分布与气候因子的关系，并据此估测其潜在中心分布区和潜在最大分布范围，与实际分布范围进行比较。

L. glutinosa is one of the species dominating the southern subtropical evergreen broad-leaved forest. L. glutinosa is well adapted on soil and light, with fast growth speed, which is an excellent preclimax species.

潺槁树是南亚热带季风常绿阔叶林优势种之一，对土壤、光的适应性强且生长迅速的一种优良前顶极种。

The results of the study on the occurrence, distrbution and natural control effect of fourteen parasitic wasps parasitized on two scales in Zhejiang citrus planting areas are presented. The results indicated that Microterys flovus How., M. ceroplastae Prirtsloo, M.sp and Metaphycus pulvinariae How. of Encyrtidae and Coccophagus iycimnia of Aphelindae are predominant, the rate of parasitism is 80-100%. If any one of the above mentioned five species of parasitic wasp is occurred in the orchard, the damage caursed by those two scales could be controlled.

本文对浙江桔区这两类蚧虫的14种寄生蜂的发生、分布及其天然制约作用进行了深入研究，以跳小蜂科的软蚧花翅跳小蜂、蜡蚧花翅跳小蜂、黑褐花翅跳小蜂、软蚧阔柄跳小蜂和蚜小蜂科的赖食软蚧蚜小蜂为优势种，寄生率高达80%～100%，在桔园只要有上述5种中任何一种寄生蜂存在，足以控制两类蚧虫为害。

Results There158rodents belonged to3genus in three townships of Lanping County were captured and Rattus norvegicus caught in residential areas accounted for90.09%.Apodemus agrariuswas predominant in the field accounted for63.16%.The infectious rates of Hattanvirus in Rattus norvegicus and Suncus murinus were7.69%and25.00%,respectively.Hattanvirus was not detected from other animals.The IgG antibody positive rate to Hattanvirus in the serum of hosts of rodents and human population were12.20%and7.00%.

结果 兰坪县3 乡镇共捕获5属158只啮齿动物，其中居民区中褐家鼠的构成比为91.09%，为优势；野外高山姬鼠的构成比为63.16%，为优势种。3个乡镇中仅见中排乡捕获的褐家鼠汉坦病毒抗原的感染率为7.69%（5/65），臭鼠句鼠青为25.00%（1/4），其他捕获的动物中未查出汉坦病毒抗原；宿主动物血清中汉坦病毒IgG抗体阳性率为12.20%（5/41），其中褐家鼠的阳性率为12.50%（5/40）；人群中汉坦病毒IgG抗体阳性率为7.00%（3/43）。

In order to disclosure the formation rule of predominant species in different nutrition conditions,three kinds of nutrition concentration were selected for the competition experiments with the common species of blue-green algae bloom Microcystis aeruginosa and the common species of green algae bloom Scenedesmus quadricauda .

为了揭示不同营养条件下，藻类优势种的形成规律，选取了3种具有代表性水体的营养盐浓度，对于蓝藻水华的常见种铜绿微囊藻和绿藻水华的常见种四尾栅藻进行了竞争实验。

The effects of the invasion of the imported fire ant,solenopsis invicta on the communities of the native ant s were investigated by bait methods in BeiLiu,GuangXi from Sept.

对入侵区与未入侵区比较发现不同生境下，红火蚁入侵使本地蚂蚁的个体数量明显降低，丰富度、多样性和均匀性指数均下降，优势度指数升高，红火蚁成为优势种。

The results show that the transgenic hybrid poplar can decrease the number of defoliating insects and lower the dominance of the dominant species, and increase the insect diversity and the evenness of insect pest subcommunity.

结果表明，转基因741杨能明显降低群落中食叶害虫的数量，同时，使群落中食叶害虫优势种的优势度降低。

Tissue culture plate was proved to be excellent to provide convenient microscopic observation and suitable space for microalgal living.

利用组织培养板方便的显微观测条件和适宜容积提供微藻存活的空间，在不同培养条件下，进行微藻群落演替、及时显微跟踪检测和优势种分离，可以使野外水样初期低生物量种类优势化，以利于纯系种质的获得。

The typical desert predominates in the vegetation can be divided into 3 vegetation types, 7formation groups, and l7 formations; and community with fewer species, simple structure disparts greatly by environment at there.

目前的植被正处在进一步退化过程中，植物种类和面积减少，大面积枯梢、死亡，优势种的优势度增大。

In her eyes, because that is the doorway toher heart * the place where love resides.

女人的漂亮必須從她的眼睛中去看，因為那是她心靈的窗戶和愛居住的地方

I will send some postcards to you.

我会向你发送一些明信片。