| 1. | Study on dynamics of growing of 12 species herbage and aboveground biomass of plant community in meadow grassland 草甸草原12种牧草生长发育规律和 |
| 2. | The number of forest patches in forest - meadow regions is greater than that in the forest zone and in meadow - steppe regions 在森林-草原交错带森林草甸区森林斑块的数量最多,其次为森林带,再次为森林-草原交错带草甸草原区,草原带没有森林斑块。 |
| 3. | Vertical vegetative differentiation exists in the eastern mountainous area of northern liaoning province , while horizontal vegetative differentiation occurs in the central plain and western sandy meadow 摘要辽北地区东部低山丘陵区存在植被垂直分异现象,中部平原区和西部沙质草甸草原区存在植被水平分异现象。 |
| 4. | The average of shannon - wiener diversity index was 1 . 5481 in typical steppe abandoned land , which was only 55 % of natural grassland , while it was 1 . 3492 in meadow steppe abandoned steppe 典型草原撂荒地shannon - wiener多样性指数的平均值为1 . 5481 ,是天然草地的55 ,草甸草原带撂荒地shannon - wiener多样性指数的平均值为1 . 3492 ,是天然草地的50 。 |
| 5. | A known amount of lycopodium spores was added to each sample to calculate the concentration of pollen ( grains / gram ) . pollen was examined at magnifications of 100 + and 400 + and identified using modern pollen collections and published atlases P2 - 1 :该亚带木本花粉的浓度达到了9 . 79粒克,而草本植物花粉的浓度相对于p1带有所下降,气候条件较好,植被为草甸草原。 |
| 6. | The main characteristics of land use / land cover change in xilin river basin over the past two decades were significant decrease in area of meadow grassland , temperate grassland vs . significant increase in area of cropland , desert grassland , urban area and desertilized land 锡林河流域20年来土地利用/土地覆盖变化的主要特征为草甸草原、典型草原面积的大幅减少和荒漠草原、农田和沙漠化土地面积的大幅增加及城镇的扩张。 |
| 7. | Steppe diversity , however , is characterized by higher plant diversity in the ecotone , especially in the forest - meadow region . diversity indices of plant communities reached peak values at the boundaries between the ecotone and the forest zone or the steppe zone , and between the forest - meadow region and the meadow - steppe region within the ecotone 在森林-草原交错带多样性指数较高,表现在多样性指数在森林-草原交错带与森林带和草原带之间以及森林-草原交错带内森林草甸区和草甸草原区之间的边界不同程度地出现峰值。 |
| 8. | The edition of graphical data is operated on mge software and the area of all kinds of grassland types is calculated on the titan gis software . the result shows that : the total rangeland area of xinbaerhuyou banner is 2257078 . 62 hm2 , its area percentage is 89 . 86 % ; the area percentages of temperate steppe type , temperate meadow steppe type , lowland meadow type , marsh type and temperate forage improved grassland are separately 85 . 11 % , 1 . 23 % , 12 . 19 % , 1 . 19 % and 0 . 28 % . in lowland meadow type , two new subtypes - lowland meadow subtype and lowland saline meadow subtype are found , which were not found in the former materials 研究结果表明:新巴尔虎右旗草地类型的总面积为2257078 . 62hm2 ,占总土地面积的89 . 86 % ;温性草原类、温性草甸草原类、低地草甸类、沼泽类及改良草地面积占草地总面积的比例分别为85 . 11 % 、 1 . 23 % 、 12 . 19 % 、 1 . 19 %和0 . 28 % ;低地草甸类中出现了以前没有的低湿地草甸亚类和低地沼泽化草甸亚类。 |
| 9. | Vegetation dynamics and soil characteristics of different period abandoned land was conducted in typical steppe at xilinguole league and meadow steppe at hulunbeier league , inner mongolia . the results showed : the function community of annual plants , perennial rhizornatous grasses and perennial rosette grasses were appeared at different succession stage of abandoned land in typical steppe and meadow steppe 本试验分别在内蒙古锡林郭勒盟典型草原带和呼伦贝尔盟草甸草原带对不同撂荒年限的撂荒地植被动态及土壤特性进行了研究,目的是探讨草原区撂荒地植被演替的规律,为撂荒地植被的重建提供理论依据。 |
| 10. | The decrease in area of meadow grassland and temperate grassland with high production vs . increase in area of desert grassland with low production indicated a dramatic degradation of the grassland in north china and the overwhelming impacts of human activities superimposed on the natural grassland ecosystem 草甸草原面积亦呈逐年减少的趋势,从1987年的1103km ~ 2减少到2000年375km ~ 2 ,面积减少了65 . 9 。优质高产草原类型面积的减少,以及荒漠类低产劣质草原面积的增加,预示我国北方优良天然草场资源正在急剧退化。 |