浑善达克沙地植被生长季流沙地及其接壤草地的沙物质粒径组成  

The sand grain diameter composition of quicksand and its contiguous grassland in Hunshandake sandy land in growth season

作　　者：贺晶[1] 吴新宏[1] 杨婷婷[1] 李鹏[1] 

机构地区：[1]中国农业科学院草原研究所,呼和浩特010010

出　　处：《干旱区资源与环境》2015年第1期95-99,共5页Journal of Arid Land Resources and Environment

基　　金：国家环保公益性行业科研专项北方防风固沙重要区经济利用限值研究(201109025)资助

摘　　要：为进一步了解浑善达克沙地植被生长季流沙地及其接壤草地沙物质粒径的组成。选择正蓝旗为研究区,在植物生长季,沿草地-流沙地的过渡带设置取样点,在流沙地上风处草地、流沙地、流沙地下风处草地各设置15个样点,每个样点取表层沙物质,然后测定植被盖度、高度和生物量鲜重,通过分析比较不同植被盖度下的沙物质的粒径组成,发现流沙地上风处草地和流沙地下风处草地中沙(0.25-0.5mm)和细沙(0.1-0.25mm)含量较稳定,流沙地粗沙(>0.5mm)含量最高。通过分析植被盖度、高度、生物量与沙物质粒径组成的相关关系,得知随着植被盖度的增加,细物质(包括中沙(0.25-0.5mm)、细沙(0.1-0.25mm)、极细沙(0.05-0.1mm)、粉沙(<0.05mm))的百分含量在增加,而粗沙的百分含量在减少。该研究可为沙化草地的合理利用提供参考。In order to understand the composition of sand grain diameter near quicksand of Hunshandake sandy land better,we selected Zhenglan Banner as the study area. We set the sampling plots along the grass- quicksand transition zone in the growing season. There were three sets,including the grassland before quicksand,quicksand and the grassland after quicksand. We choose 15 samples of each set,then measured vegetation cover,height and fresh biomass weight. By analyzing the data about the sand material particle size composition under different vegetation coverage,we concluded that the percentage content of fine sand（ 0. 5mm） was stably existed in the grassland before quicksand and the grassland after the quicksand,the percentage content of coarse sand（ 0. 5mm） was the highest in the quicksand. Through analyzing the relationship among the vegetation cover,height,fresh weight of biomass and composition of the sand material particle,we found that along with the increase of vegetation cover,the percentage content of fine sand（ 0. 5mm） materials was increased and the percentage content of coarse sand（ 0. 5mm） was decreased. This study could provide reference for the rational use of sandy grassland.

关 键 词：沙物质粒径 植被盖度 流沙地 

分 类 号：S812[农业科学—草业科学]