沙埋对唐古特白刺幼苗生长和生物量分配的影响

薛海霞; 李清河; 徐军; 张俊菲

doi:10.11829/j.issn.1001-0629.2015-0690

沙埋对唐古特白刺幼苗生长和生物量分配的影响

1.
中国林业科学研究院林业研究所, 国家林业局林木培育重点实验室,北京 100091
2.
中国林业科学研究院沙漠林业实验中心,内蒙古磴口 015200

基金项目:

国家自然科学基金 (31470622)

中央级公益性科研院所基本科研业务费专项(CAFYBB2014QA034)

摘要: 在沙地环境中,沙埋是影响植物生长的重要因素。唐古特白刺(Nitraria tangutorum)是荒漠地区重要的建群种之一。为了研究沙埋对幼苗生长及生物量分配的影响,对扦插成活后生长了两个月的白刺幼苗进行不同沙埋深度处理试验(沙埋深度分别为0、5、10、15 cm)。试验持续3个月,每个月收获一次。结果表明,1)沙埋中期和后期,轻度沙埋(5 cm)和中度沙埋(10 cm)较其它处理而言,白刺幼苗的基径、根平均基径和总根长显著增加(P<0.05);2)沙埋前期和中期,与其它处理相比,对照(0)显著增加了白刺幼苗一级枝的茎生物量和叶生物量,且相对生长速率和净同化速率大多高于其它处理;3)与其它处理相比,轻度沙埋处理对(5 cm)白刺幼苗二级枝的影响最明显,能显著增加白刺幼苗二级枝的茎生物量、叶生物量、叶片数量和总叶面积(P<0.05)。同时白刺幼苗的相对生长速率和净同化速率也有明显的增加;4)重度沙埋(15 cm)时,白刺幼苗的相对生长速率和净同化速率大多低于其它处理。研究结果表明,轻度沙埋能促进白刺幼苗分枝的生长,而重度沙埋则对其产生抑制作用。唐古特白刺作为枝源压条型克隆植物,在防风固沙时应对其进行轻度沙埋以促进分枝的生长,从而有利于其无性繁殖。

关键词:

English

Effects of sand burial on growth and biomass allocation of Nitraria tangutorum

1.
Research Institute of Forestry, Chinese Academy of Forestry
2.
Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou 015200, China

Received Date: 2015-12-03
Publish Date: 2016-10-19

Abstract: Sand burial is an important way to change seedling growth in sand land. Nitraria tangutorum is one of the main constructive plants in desert areas. In order to investigate the impacts of sand burial on seedling growth and biomass allocation, the plant propagation were cut successfully and grown in testing grounds, which were buried by sand with four sand-burial depths(0, 5, 10 and 15 cm) for two months. The growth of the seedlings in different sand-burial and biomass were examined once a month for three months. The results showed that 1) At the mid-period and late-period of the experiment, the basal diameter, mean diameter of root and total root length of N. tangutorum seedlings increased more significantly with light and moderate sand burial than other treaments. 2) At the early-period and mid-period of the experiment, the primary branch of stem and leaf mass increased more significantly in 0 cm sand-burying than other treatments, while the relative growth rate and net assimilation rate were mostly higher than other treatments. 3) Compared to other treaments, light sand burial had a marked influence upon the secondary branch, which could significantly increase the stem and leaf mass, number of leaves and total leaf area of N. tangutorum. 4) The relative growth rate and net assimilation rate of N. tangutorum seedlings were mostly lower in 15cm sand-burying than in other three treatments, suggesting that light sand burial can promote the growth of N. tangutorum seedlings, while heavy and severe sand burial injure the plant growth seriously. N. tangutorum, as a clonal plant of stem-layering, should be buried with sand lightly in order to promote the growth of branches and the ablity of exual reproduction when used for fixing mobile sand.

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沙埋对唐古特白刺幼苗生长和生物量分配的影响

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Effects of sand burial on growth and biomass allocation of Nitraria tangutorum

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