一年生草本植物是荒漠绿洲过渡带人工固沙植物群落草本层的优势植物类群，由于风沙活动剧烈，风蚀和沙埋成为一年生草本植物生存的关键选择动力因素。以河西走廊荒漠绿洲过渡带典型一年生草本植物狗尾草（Setaria viridis）、虎尾草（Chloris virgata）、白茎盐生草（Halogeton arachnoideus）和雾冰藜（Bassia dasyphylla）为研究对象，通过0（对照）、1、2、3、5、10、15 cm深度沙埋试验，探寻沙埋对一年生草本植物的影响。结果表明：（1）4种一年生草本植物在0—1 cm埋深出苗率最高，狗尾草最大出苗深度为10 cm，虎尾草和雾冰藜为5 cm，白茎盐生草为3 cm；（2）不同沙埋深度下，4种一年生草本植物的生长（株高和总生物量）和繁殖（种子数量和百粒重）高值区位于2—3 cm埋深，3 cm往下虎尾草和雾冰藜存活率显著下降，而狗尾草仍保持较高存活率；（3）不同沙埋深度下，4种一年生草本植物的渗透调节物质（可溶性糖、可溶性蛋白和游离脯氨酸）含量在2—3 cm埋深达到最高，丙二醛（MDA）含量高值主要位于3—5 cm埋深，叶绿素含量在1—2 cm埋深最高，2 cm往下开始降低；（4）一年生草本植物的生长存活与游离脯氨酸和叶绿素含量呈极显著相关关系，表明二者对保持植物叶片水分平衡和保证光合作用、维持植物正常生长起着更关键的作用。研究可为荒漠绿洲过渡带一年生草本植物恢复提供科学依据。

Annual herbaceous plants are the dominant plant groups in the herb layer of the artificial sand-fixing plant community in the desert-oasis ecotones. In order to assess the impact of the depth of sand burial on the emergence， growth and reproduction of annual herbaceous plants， the typical annual herbaceous plants Setaria viridis， Chloris virgata， Halogeton arachnoideus and Bassia dasyphylla were selected in a typical desert oasis ecotone of Hexi Corridor as the research object， through 7 sand burial depth experiments of 0 （CK）， 1， 2， 3， 5， 10 cm and 15 cm， aiming to explored the impact mechanism of sand burial on annual herb. The research results showed that： （1） Four kinds of annual herb plants had the highest emergence rate at a depth of 0-1 cm， the maximum emergence depth of S. viridis was 10 cm， C. virgata and B. dasyphylla 5 cm， and H. arachnoideus 3 cm； （2） Under different sand depths， the growth （plant height and total biomass） and reproduction （number of seeds and 100-seed weight） of the four annual herbaceous plants were high in 2-3 cm. After 3 cm， the survival rate of Chloris virgata and B. dasyphylla significantly decreased， and S. viridis still maintained a high survival rate. （3） Under different sand burial depths， the content of osmotic adjustment substances （soluble sugar， soluble protein and free proline） of four annual herbaceous plants reached the highest at 2-3 cm， and malondialdehyde （MDA） ） the high content was mainly located at the depth of 3-5 cm， the chlorophyll content was the highest at 1-2 cm， and then started to decreased after 2 cm； （4） Correlation analysis showed that the growth and survival of annual herb plants are extremely significantly correlated with free proline and chlorophyll content The relationship showed that the two played a more critical role in maintaining plant leaf water balance， ensuring photosynthesis， and maintaining normal plant growth. The research can provide a scientific basis for the restoration of annual herbaceous plants in the desert-oasis ecotones.