Effects of sand-buried on annual herbaceous plants in desert-oasis ecotone of Hexi Corridor Gansu,China

Authors Song Bing; Wang Guohua; Gou Qianqian; Xi Lulu

Journal Journal of Desert Research , 2021,3:41

Abstract 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.

Species covered 雾冰藜 Bassia dasyphylla 狗尾草 Setaria viridis