Soil physical properties of a typical road ecological zone in Qixing Lake in the spring__ | 七星湖景区典型护路生态带内春季土壤物理特性研究__

chinois. 对防护带的白沙蒿带、旱柳-白沙蒿带和沙障-白沙蒿带3个部位以及附近裸沙区60 cm土层内的土壤含水率、容重以及机械组成进行了测定和对比分析。结果表明，各观测区土壤含水率均表现出随深度的增加而增大的趋势，30和60 cm土层含水率均为2%~3%；土壤平均含水率各样地间差异不显著。裸沙区土壤容重随深度增加略微增大，生态带内规律相反；沙障-白沙蒿带、白沙蒿带和旱柳-白沙蒿带的平均土壤容重分别比裸沙区减小了4.0%、6.4%、9.0%。表层土壤内小于0.1 mm的极细沙和粉沙含量均高于地下2层；细颗粒平均含量排序为旱柳-白沙蒿带（7.67%）白沙蒿带（7.56%）沙障-白沙蒿带（7.11%）裸沙区（5.03%）。观测区内土壤可为现有不同植被的萌发提供相同水平的水分条件，植被明显改善了土壤容重，增加了细物质含量，旱柳-白沙蒿这种乔灌混合模式的效果最好。_

anglais. The soil physical properties in 0-60 cm soil layer of the bare sand area and three parts of a typical road ecological zone growing different vegetations in Qixing Lake were studied. Research indicators include soil moisture content, bulk density and soil mechanical composition. The results indicated that soil moisture content increased with the increasing of soil depth, and soil moisture content are between 2%-3% in every 30 and 60 cm soil layers; the diversity of average soil moisture content between plots were not significant. Soil bulk density of the bare sand area increased with the increasing in soil depth, but there was appeared a contrary tendency in ecological zone; compared with bare sand area, average soil bulk density of the areas covered with salix sand barriers_Artemisia sphaerocephala _Krasch, pure Artemisia sphaerocephala Krasch and Salix matsudana-Artemisia sphaerocephala Krasch were decreased by 4.0%, 6.4%, 9.0%, respectively. The percentage of fine particles (particle fraction0.1 mm) in topsoil are more than that in deepsoil; the order of four viewing areas, in terms of the average percentage of fine particles, was:_Salix matsudana-Artemisia sphaerocephala _Krasch area (7.67%) pure _Artemisia sphaerocephala _Krasch area (7.56%) salix sand barriers__Artemisia sphaerocephala _Krasch area (7.11%) bare sand area (5.03%).So, the road ecological zone can provide a same level of soil moisture conditions for the germination of existing vegetations, the vegetation improved the soil bulk density and increased the percentage of fine particles significantly, especially the mixed forest of _Salix matsudana _and _Artemisia sphaerocephala _Krasch._