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中国沙漠  2012 

不同供水条件下梭梭幼苗生长动态的研究

Keywords: 梭梭,幼苗,供水,生长动态

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Abstract:

在自然条件下,以梭梭幼苗为研究对象,设计单次供水10、20、40、60mm和80mm5个水分梯度,模拟不同融雪量对幼苗在生长季节内影响变化的情况。结果表明,供水量显著影响了梭梭的幼苗高、根长、苗干重、根干重、基径。在整个生长季的一些阶段,对苗高、根长、苗干重、根干重、基径生长率影响显著,对其根冠比也有显著的影响。在实验供水范围内,供水越多,越有利于梭梭幼苗存活与生长。梭梭幼苗垂直根长大约是株高的3~5倍,梭梭垂直根长增加的速率明显大于高度增长的速率(一般为2~6倍,最大甚至超过10倍),因此,在干旱期来临之前,幼苗根系的快速生长对其成活起着决定性作用。

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