腾格里沙漠东南缘飞播区白沙蒿植被密度与土壤水分关系的研究  

A Study on Relationship between Vegetation Density and Soil Water Content of Artemisia sphaerocephala Air-sown Grassland in South-eastern Edge of Tengger Desert, Inner Mongolia, China

作　　者：付华[1] 周志宇[1] 陈善科[2] 

机构地区：[1]甘肃省草原生态研究所 [2]内蒙古阿拉善盟草原工作站,内蒙古巴彦浩特750300

出　　处：《中国沙漠》2001年第3期265-270,共6页Journal of Desert Research

基　　金：国家自然科学基金重点项目 (3 973 0 10 0 ) ;中国科学院沙坡头沙漠试验研究站基金资助

摘　　要：对腾格里沙漠东南缘飞机播种区不同密度白沙蒿 (ArtemisiasphaerocephalaKrasch)人工草地的土壤水分和植物生长状况进行研究。结果表明 ,白沙蒿密度在 5 1～ 9株·m-2 时 ,整个生长期土壤水分处于严重亏缺状态 ,0～ 10 0cm土层水分含量仅为 0 5 5 %～ 0 7% ,白沙蒿死亡率高达 5 5 %～ 76 7% ;密度在 1 9株·m-2 时 ,其土壤水分含量在 0 6 5 %～ 1 0 1% ,白沙蒿死亡率为 2 1 1% ;密度在 1 2 5株·m-2 时 ,土壤水分在 0 79%～ 1 48% ,白沙蒿无一株死亡 ,且植株个体生长状况好于密度大样地 ,并有自繁育苗补偿 ,这表明研究区种植白沙蒿的适宜密度在 1株·m-2 左右。裸露沙地 0～ 10 0cm土壤含水量为 1 3%～ 2 48%Relationships of soil water content and plant growth in \ %A rtemisia sphaerocephala\% air-sown grassland were studied in southeastern edge of Tengger desert. The results showed that when vegetation densities was 5\^1～9 plant\5m -2, soil water contents were only 0\^55%～0\^70% in 0～100 cm laye r severely insufficient to need and plant mortality rates were as high as 55%～76\^ 7%; When vegetation density was 1\^9 plant\5m -2, soil water content were 0 \^65%～1\^01% and plant mortality rate was 21\^1%; However, when vegetation dens i ty was 1\^25 plant\5m -2, soil water contents were 0\^79%～1\^48%, no plant died, individual plant was growing better than those in high density field, and self-multiplied seedlings were growing under this condition. Therefore, the opt imal density of \%Artemisia sphaerocephala\% was about 1\^0 plant\5m -2 in this area. The study also indicated that soil granule constituent and microbioti c soil-crust depth were affected by vegetation density greatly. Coarse sand con tents were respectively 37\^0%, 25\^8% and 16\^3% in bare desert, middle vegetat ion density and high vegetation density, whereas the correspondent thick of crus ts were 0, 1\^1～1\^2 and 1\^4～1\^7 cm. By contrast, soil water content was 1\^ 3%～2\^48% in bare desert.

关 键 词：腾格里沙漠 土壤水分 白沙蒿 密度 生长状况 固沙植物 

分 类 号：Q948.113[生物学—植物学]