The seasonal changes of total carbohydrate , soluble carbohydrate , starch , mannitol and fructan in the below ground organs of both species showed the same ' down - up - down - up ' trend 5月20日10月15日，羊草和大针茅地下器官中的碳水化合物总量、可溶性碳水化合物含量、淀粉含量、甘露醇含量和果聚糖含量均表现出“降低升高再降低再升高”的特征。
Random amplified polymorphic dna ( rapd ) analyses were used to estimate the genetic diversity of different populations of stipa grandis and their distribution , as well as the ecological factors in relation to the genetic differentiation of s . grandis 摘要应用rapd技术检测大针茅植物7个群体的遗传多样性及其分布，探索生态因子与遗传分化的相互联系。
To understand the characteristics of carbohydrate storage of perennial grasses , we analyzed the content and seasonal dynamics of carbohydrate components in below ground organs of l . chinensis and s . grandis using high performance liquid chromatography 为了研究草原植物碳水化合物贮藏特性，采用高效液相色谱技术对羊草和大针茅的贮藏性碳水化合物的种类组成及季节变化进行了测定。
I felt in his pockets , one after another . a few small coins , a thimble , and some thread and big needles , a piece of pigtail tobacco bitten away at the end , his gully with the crooked handle , a pocket compass , and a tinder box , were all that they contained , and i began to despair 我逐个摸了他的口袋，几个小硬币，一个顶针，还有一些线和大针，一支咬了一头的嚼烟，他那把弯柄的招刀，一个袖珍罗盘，还有一个火绒箱，这就是口袋里面装的全部东西了。
At the same time , the carbon cycle at mid - latitudes of north hemisphere still remains unknown , which leads people to nowhere in gaining a deep understanding of the mechanism of global change . in xilin river basin , inner mongolia , which is right located at the mid - latitudes of north hemisphere , the high speed of social - economic development shows high rate and strong intensity to land use / land cover change in the past two decades . in this paper , remote sensing , gis and ecological modeling techniques were combined to study the land use / land cover change and carbon cycle of xilin river basin 文章首先对内蒙古锡林河流域四个时期的landsattm / etm +影像进行土地利用/土地覆盖分类、成图；通过对比，分析了锡林河流域近20年的来的土地利用/土地覆盖变化；并进一步运用gis方法研究了锡林河流域草地退化的演化路径；最后运用century模型模拟了内蒙古锡林河流域大针茅草原、羊草草原的碳循环过程，绘制了其碳循环模式图；并进一步分析了锡林河流域典型草原生态系统对大气碳库的源/汇功能。
