Abstract: In order to elucidate the dynamic characteristics of vegetation and its relationship with litters in different types of sandy land in Horqin,3 different habitats including of mobile dune,fixed dune and fencing grassland were used as objectives of study. We measure vegetation characters at the top growing season (mid-August) and the amount of plant litter during the growing season (April to September) from 2005 to 2016,and analyzed the relationship between vegetation characters and plant litter. The results showed that the vegetation characters differed significantly among habitats,and there were remarkable inter-annual variations for the aboveground biomass,plant density and vegetation coverage. Meanwhile there were significant interactive effects among habitats and year for vegetation character. The amount of plant litter was affected by habitats,year,month and their interactions. The regression analysis showed that,there was significant and positive linear relationship between vegetation characters and plant litter mass. However,the vegetation characters were related to plant litter mass insignificantly at the scale of each habitat. In conclusion,plant litter production was influenced significantly by plant growth in Hoqin Sandy Land,while the vegetation characters were related to plant litter mass insignificantly,the amount of plant litter may be affected by other factors.

Key words: Horqin Sandy Land, Vegetation character, Litter production, Interannual dynamics

摘要： 为探究科尔沁不同沙地类型植被动态特征及其与凋落物的关系，本试验以科尔沁沙地不同类型样地（流动沙丘、固定沙丘和封育草地）为研究对象，测定了2005-2016年生长季高峰期（8月中旬）植被特征和整个生长季（4-9月）凋落物量的动态，分析了二者的年际动态及关系。结果表明：不同类型样地植被特征差异极显著，植被密度、盖度和生物量均有明显的年际动态，且年际动态和样地类型间存在显著交互效应；凋落物量受样地类型、年、月3因素及其交互效应的影响；回归分析表明，植被特征与凋落物量呈极显著线性关系，但小区域范围内，植被特征与凋落物量关系不显著。综上，植被生长显著影响凋落物产生，但植被特征与凋落物量关系不显著，凋落物量可能还受其他因素的影响。

关键词: 科尔沁沙地, 植被特征, 凋落物生产, 年际动态