梭梭幼苗出土及生长对沙埋深度的响应  

Seedling Emergence and Growth Responses of Haloxylon ammodendronto Sand Burial Depth

作　　者：吕朝燕[1,2] 张希明[2] 高智席[1] 韩畅[1] 王加真[3] 张宝成[3] 

机构地区：[1]遵义师范学院农业科技学院,贵州遵义563002 [2]中国科学院新疆生态与地理研究所,新疆乌鲁木齐830011 [3]遵义师范学院生命科学学院,贵州遵义563002

出　　处：《北方园艺》2016年第3期55-60,共6页Northern Horticulture

基　　金：贵州省教育厅自然科学研究资助项目(黔教合KY字[2015]409号);遵义师范学院博士基金资助项目(遵师BS[2014]17号);国家自然科学基金资助项目(30870472)

摘　　要：沙埋是沙地植物生长和分布的重要选择压力之一,也是影响植物种子萌发、幼苗出土和幼苗存活的关键因素。选择梭梭典型自然生境,模拟梭梭种子自然埋藏深度状况,研究了0、0.5、1.0、2.0、3.0cm 5种沙埋深度对其出苗率及幼苗生长的影响。结果表明:梭梭种子出苗率随埋深增加呈先增加后减小趋势,沙埋深度为0cm时出苗率为4.2%,沙埋深度为0.5、1.0、2.0cm时,出苗率分别为31.9%、14.7%和0.9%,沙埋深度为3.0cm时无出苗。出苗早期,幼苗死亡率均较高,达到平均80.7%;其后,死亡率下降,且2.0cm埋深幼苗死亡率显著高于其它处理,直至幼苗全部死亡。埋深对幼苗生长动态的影响主要表现在幼苗生长早期,0.5cm埋深幼苗的地上、地下部分生长以及根冠比均大于0cm和1.0cm埋深;随着时间的推移,差异逐渐减小。表明0.5cm埋深是梭梭种子萌发和幼苗生长的最佳深度。综上,中度沙埋在一定程度上可以促进梭梭种子的萌发出土与幼苗的早期生长,而重度沙埋抑制幼苗的生长,甚至导致幼苗的死亡。Sand burial was one of the main stress on growth and distribution of sandy plant,and it is also the main factor that affected seed germination,seedling survival and growth in sandy land.To investigate the effect of burial depth on the Haloxylon ammodendron seedling＇s emergence and growth in its typical natural habitats,a simulated study was conducted with five sand burial depth（0,0.5,1.0,2.0,3.0cm）.The results showed that the seedling emergence rate increased first but decreased then with increasing burial depth,being 4.2%,31.9%,14.7%,0.9% and 0% when the burial depth were 0,0.5,1.0,2.0,3.0cm.And during the early stage of seedling emergence the seedling mortality was high in each treatment with average 80.7%.After that it decreased and it was significantly higher in 2.0cm than the other.Additionally,the seedling shoot and root growth and the root/shoot ratio in 0.5cm were higher than 0cm and 1.0cm during the early stage of seedling emergence.And this difference became small with the time.It was suggested that the optimal sand burial depth of H.ammodendronfor its seedling emergence and growth would be 0.5cm.Totally,it could be concluded that moderate burial could promote the seed germination,seedling emergence and its growth of H.ammodendron,but intensive burial could restrain its grown,even lead the seedling to die.

关 键 词：梭梭 沙埋深度 出苗率 幼苗生长 生物量分配 

分 类 号：S157.433[农业科学—土壤学]