牧草地的

In nearer ten years, assart grassland is very serious in the northern grassland, and show "two raise and three decrease","two raise" are farmland raise and garden raise,"three decrease" are grass decrease, forest area decrease and pasture area decrease.

近十余年来，我国北方草原地区开垦草地现象十公严重，出现了"两增三减"的现象，"两增"是耕地面积大幅度增加，园地面积大幅度增加；"三减"是牧、草地面积减少，林地面积减少。

With a study of plant community succession on 5 stocking rates,herbage utilizational efficiency and risk-benefit balance,it is suggested the sustainable development should follow:(1)no degradational principle of rangeland,(2)the maximum herbage utilizational efficiency,(3)the risk-benefit balance,When stocking rate was no more than 2.67 sheep/hm2,the proportion of grasses and plant biodiversity index and evenness were increased based on Artemisia frigida and short-grass rangeland.

草地畜牧业可持续发展的三大生物经济原则为草场不退化原则、最大生物学效率原则和风险-利润权衡原则：(1)草场不退化原则。在冷蒿小禾草退化草原上，暖季期间1.33～2.67羊/hm\+2的放牧率下可使其发生恢复演替，禾草的比例增大，植物多样性指数和均匀度指数均有所提高，从而达到利用式改良的目的；相反，若继续重牧或过牧，放牧绵羊喜食的植物种类将进一步减少，植物多样性指数也有所降低。

The advantageous one mainly included different measures of vegetation restoration such as fencing, rehabilitated fields, abandoned land etc. and polices or laws about desertification debating. The disadvantageous influences included illegal grazing, estrepement, firewood cutting and so on.

有利因子如退耕还草、人工封育、撂荒等草地植被恢复及荒漠化防治措施以及相关的荒漠化防治政策法规的实施，不利因子如偷牧、滥垦、滥樵等。

The total trend of succession was from tall erect -growth kobresia community to short prostrate-growtii forbs community, the vertical perennial forbs community was transition.5 Grazing interference gave certain effect on soil of alpine meadow.

群落演替的总趋势为由高大直立生长的嵩草群落向低矮耐牧的匍匐型植物、莲座状植物组成的杂类草群落演替，其间以直立多年生杂类草群落为过渡。 5 放牧干扰对高寒草甸草地土壤产生了一定的影响。

European moth with white antler-like markings on the forewings; the larvae damage pastures and grasslands.

前翅上有白色鹿角状斑点的欧洲蛾子；其幼虫破坏草地和牧

The study with 9 local wethers was designed as three treatments including the control, the light- and heavy- grazing.

试验分为三个处理：对照、轻牧和重牧，并在此基础上选用9只当地羯山羊，较系统地研究了灌丛草地在不同山羊放牧率下的群落结构、生产力和营养价值动态以及在不同放牧强度下山羊对灌丛草地植物的喜食性变化。

The research shows that:①The land use/cover of Asia at the ecological security level takes on a macroscopical three-circle pattern.

研究表明：①亚洲生态安全条件下的土地利用/覆盖宏观三圈格局为：内圈以自然保护为主的沙漠地带；中圈以建设人工草地为主，辅以大面积自然恢复的草原地带；外圈以农、林、牧复合为主的交错地带。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。