查询词典 grassland

During the Last Interglaciation it was the forest, mainly composed of broadleaves, or forest-grassland at the east and middle part of the Chinese Loess Plateau, and was the forest-grassland at the west part of the Chinese Loess Plateau. It changed to the forest or forest-grassland at the most part of the Chinese Loess Plateau in the Holocene, some kinds of hardwood broadleaves dispersing at the warm temperate and the tropic zones appeared. Now the vegetation at the Chinese Loess Plateau inherits from that during the Holocene, the vegetation have been heavily destroyed owing to the human being actions. The vegetation protection at the Chinese Loess Plateau is a significant problem.

末次间冰期期间气候温暖湿润，黄土高原的中、东部地区主要发育了以落叶阔叶林为主的森林或森林草原植被，黄土高原西部地区主要发育的是以针叶林为主森林草原植被；全新世期间黄土高原的植被状况发生较大变化，黄土高原的大部分地区为森林植被或森林草原植被，植被中还有暖温带落叶阔叶林，并含有少量亚热带种属；现代黄土高原的植被主要还是继承了全新世以来的植被状况，但是由于人类活动的加剧，对黄土高原的植被产生了毁灭性的破坏，因此，如何保护黄土高原的自然植被是我们面临的一个严峻的现实问题。

Those of grassland are seasonably banning graze, sealing the grassland, cultivate man-made grassland, and etc.

草地的有季节性禁牧、封育、补播改良、建设人工草地等。

There exsits the same problem in Chiese grassland management. The government carries out Household responsibility system in grassland managemnt, which is used in agriculture land,but don't consider the relationship shaped between grassland and herdsmen over a long period of time.That the government adopts model managment for convinience reflects laziness and unambitious of their people.

中国草原的管理同样有这样的问题，一刀切的把农耕土地的包产到户运用到草原管理上，而不考虑草原和牧民长期形成的关系，是政府对管理的模式化，是为了自己管理方便的一种懒惰，和不思进取。

The result indicated that: with the change of ecological factors and intensification of human activities,strong stability of grassland community structure of the local alpine meadow type along the highway in this region was found,proportion of medium xerophilous、rhizomous grass increased;alpine grassland community had relatively low stability,grassland community successed naturally to adapt to the new environment;...

结果显示：随着生态因子发生变化和人类活动的加剧，该区公路沿线高寒草甸类草地群落结构表现出了较强的稳定性，中旱生耐旱的根茎型禾草比重有所增加；高寒草原植物群落稳定性相对较差，草地群落为适应新的生境而发生了自然演替；沼泽化草甸亚类草地植物群落中群落伴生种的种类增加，优势种嵩草属植物在群落中的比重有所下降。

Drier the grassland, clearer this tendency. For example, in general, belowground production of Leymus chinensis grassland is higher than Stipa grandis grassland, but in 2000 it is smaller.

在本次的研究中发现，大针茅草原地下部生产力要高于羊草草原，在通常情况下羊草草原的地下部生产力都大于大针茅草原。

Over a 20-year period there was no increase in soil water content in the grazed grassland at depths of 2～9.9 m. There was a small increase(0.5～3.7 mm/a) in soil water content in the protected grassland, however the slow rate of increase suggests that at least 150 years would be needed for ungrazed grassland soils to regain water content similar to that present prior to planting trees. Recharge of deep soil moisture was faster in cropland(15 mm/a), but at this rate it would still take about 40 years to restore cropland soil water content to pre-plantation conditions.

结果表明，人工林死后的放牧荒坡在20a的时间里，其土壤水分没有补偿；人工林死后的保护草地土壤水分有微弱恢复迹象，但年恢复速度在0.5～3.7 mm之间，以这样的速度恢复到持续放牧荒坡的土壤含水量，至少需要150a以上；林后农地土壤含水量有恢复趋势，年平均恢复速度为15 mm左右，其土壤含水量要恢复到持续农地当前的水平，大约需要40a的时间。

Whether the selection of grassland grazing systems is reasonable has direct influences on sustainable utilization of grassland resources, bioenvironmental quality on grassland and herdmen's income.

草地放牧制度选择的合理与否，直接影响草地资源的可持续利用和草地生态环境质量以及牧户经营收入。

Var. chinensis Koidz was present in the grassland of middle degeneration. I. lactea was the dominant species in grassland of severe degeneration. I. lactea was the indicator plant of grassland of middle and severe degeneration.

马蔺的出现指示着草场出现了中度退化，而当其成为优势种时，指示着草场已严重退化，马蔺是一种中度、严重退化的指示物种。

Using NOAA weather satellite data and ERDAS software,grassland type surveys and charts and yieldclassification maps were made in Fukang and the marks of explainning the NOAA satallite films were set upby the sight technology Further,the dynamic monitor results of the grassland and other earth resources wereanalysed and studied by the RSECTS in Fukang, the study found that the grassland and other earth resourcesin 1992 had greatly changed than those in 1982 in Fukang.

利用NOAA气象卫星信息等和ERDAS软件，进行了阜康县草地类型分类与草地类型图和产量分级图制作，建立了NOAA卫片目视解译标志。而且利用RSECTS系统，对阜康县草地与其它土地资源进行了动态监测与分析。

To improve the purple soil storage capacity, to prevent soil erosion in hunan province, the choice of HengYangXian 20o purple soil slope, setting Guan waste land, grassland, natural forest and grassland and agrimony slight composite 4 processing, the water treatment performance and its mechanism, and the results show that, compared to the purple soil LuoDe HuangShanPo ground implement agrimony and three-dimensional planting trees for 1-2 years later, reduce soil bulk density 0.10 g/cm3 0.09 ~, soil porosity, permeability of soil moisture 14.01% increase rate increase 2.20 ~ 2.29 times.

为提高紫色土蓄水能力，防止水土流失，在湖南省衡阳县选择20o 左右的紫色土荒山坡地，设置祼地、自然草地、龙须草地和龙须草与林地复合4 个处理，比较分析各处理贮水性能及其改良机理。结果表明，与裸地相比，在紫色土荒山坡地上实行龙须草与林木立体种植1～2 年后，土壤容重降低0.09～0.10g/cm3，土壤总孔隙度增加14.01%，土壤水分渗透速率提高2.20～2.29 倍。

According to our present broadcasting situation,the thesis proposes using new technology to update and reform the present HFC. It also suggests broadcasting using self-advantage and arranging EPON in order to win the supermarket.

论文从我国广电的现状出发，结合实际，积极倡导采用新技术更新、改造我国现有的HFC网络；倡导广电现阶段利用自身优势，部署EPON网络来赢取市场。

A new general kinetic equation was derived in which the effect of the removal of condensation water was taken into account completely, and was applied to the polyesterification kinetic study of AA/HPHP and AA/NPG. It was found that the reaction order of self-catalyzed polyesterification was not constant. For these polyesterifications, the reaction order was 2.5 at a low temperature, while 3.0 at a high temperature.

考虑缩合水的排除对反应体系的影响，用体积浓度单位推导出一个新的聚酯反应总包动力学方程，并应用到AA/HPHP和AA/NPG两个聚酯化反应的动力学研究中，研究发现，自催化聚酯反应的反应级数并不是固定值，对于AA/HPHP和AA/NPG两个聚酯化反应而言，低温时反应级数为2.5，高温时反应级数为3.0。