骆驼刺在不同遮阴下的水分状况变化及其生理响应

doi:10.3724/SP.J.1258.2013.00035

摘要/Abstract

摘要：

为了研究骆驼刺(Alhagi sparsifolia)在不同遮阴环境下的生理适应性, 以塔克拉玛干沙漠南缘策勒绿洲外围骆驼刺为试验材料, 设置正常光照、中度遮阴(70%自然光)、重度遮阴(30%自然光) 3种光照环境, 观测了遮阴90天后土壤含水率, 骆驼刺水势、气孔导度(G_s)、叶形态、叶绿素(Chl)含量、脯氨酸(Pro)含量、丙二醛(MDA)含量、可溶性糖含量等在不同遮阴条件下的变化特征。结果显示: 随着遮阴强度的增大, 土壤含水率, 骆驼刺水势、G_s、比叶面积、Chl含量、类胡萝卜素含量有一定程度的增加; 骆驼刺叶片厚度、Pro含量、MDA含量、可溶性糖含量以及Chl a/Chl b有不同幅度的减少。结果表明: 一段时间内适度的遮阴在一定程度上降温增湿, 能够改善骆驼刺的生境, 从而避免高温强光和低水势对植物造成的伤害, 促进植物的生长, 但长期遮阴对植物的生长不利。因此建议通过短期的遮阴, 特别是在温度较高、光照较强的夏季正午前后对骆驼刺进行遮阴处理, 以达到对骆驼刺的逆境防护, 促进骆驼刺的生长。

关键词: 骆驼刺, 光照, 水分, 遮阴

Abstract:

Aims Alhagi sparsifolia, which occurs in arid regions, is commonly considered a type of sun plant. However, the effects of shade on A. sparsifolia are complex, because in addition to reduced light intensity, shade often changes other environmental factors. Our goal is to study the impact of different shading on the physiological form-especially in terms of water-of A. sparsifolia.
Methods We used natural light, moderate shade (70% natural light) and severe shade (30% natural light) and after 90 days observed reactions of water status, leaf morphology and stress resistance indicators in A. sparsifolia.
Important findings With the increase in shading, there are rises in soil moisture content, water potential, stomatal conductance, specific leaf area, chlorophyll (Chl) and carotenoid content in A. sparsifolia, as well as declines in leaf thickness, proline, malondialdehyde, soluble sugar content and Chl a/Chl b. Moderate shade for A. sparsifolia can reduce the temperature and increase the humidity. This can improve the habitats of A. sparsifolia by avoiding damage caused by high temperature, high light and low water potential and then promoting the growth of plants, although long-term shade is detrimental. Therefore, we recommend protecting A. sparsifolia and promoting its growth with short-term shade, especially during the high temperatures and strong light at noon in the summer.

Key words: Alhagi sparsifolia, light, moisture, shade

唐钢梁, 李向义, 林丽莎, 李磊, 鲁建荣. 骆驼刺在不同遮阴下的水分状况变化及其生理响应. 植物生态学报, 2013, 37(4): 354-364. DOI: 10.3724/SP.J.1258.2013.00035

TANG Gang-Liang, LI Xiang-Yi, LIN Li-Sha, LI Lei, LU Jian-Rong. Change of different shading on moisture conditions and the physiological response in Alhagi sparsifolia. Chinese Journal of Plant Ecology, 2013, 37(4): 354-364. DOI: 10.3724/SP.J.1258.2013.00035

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链接本文: https://www.plant-ecology.com/CN/10.3724/SP.J.1258.2013.00035

https://www.plant-ecology.com/CN/Y2013/V37/I4/354

图/表 7

图1 自然光和遮阴处理下光合有效辐射(PAR)的对比。

Fig. 1 Contrast of photosynthetic active radiation (PAR) under natural light and shade treatments. MS, mole rate shade; NS, normal light; SS, severe shade.

图2 遮阴处理前后土壤含水量的变化(平均值±标准误差)。

Fig. 2 Changes of soil water content before and after shade treatments (mean ± SE).

图3 遮阴条件下骆驼刺水势的日变化(平均值±标准误差)。

Fig. 3 Diurnal changes of water potential in Alhagi sparsifolia under shade treatments (mean ± SE).

图4 遮阴条件下骆驼刺气孔导度的日变化(平均值±标准误差)。

Fig. 4 Diurnal changes of stomatal conductance (Gs) in Alhagi sparsifolia under shade treatments (mean ± SE).

图5 遮阴对骆驼刺叶片性状的影响(平均值±标准误差)。 MS, 中度遮阴; NL, 正常光照; SS, 重度遮阴。不同字母表示差异显著(p < 0.05)。

Fig. 5 Effects of shade on leaf traits in Alhagi sparsifolia (mean ± SE). d, leaf thickness; MS, moderate shade; NL, normal light; SLA, specific leaf area; SS, severe shade. Different letters indicate significant difference (p < 0.05).

图6 遮阴对骆驼刺叶绿素的影响(平均值±标准误差)。 MS, 中度遮阴; NL, 正常光照; SS, 重度遮阴。不同字母表示差异显著(p < 0.05)。

Fig. 6 Effect of shade on chlorophyll (Chl) in Alhagi sparsifolia (mean ± SE). MS, moderate shade; NL, normal light; SS, severe shade. Different letters indicate significant difference (p < 0.05).

表1 遮阴和自然光条件下骆驼刺抗逆性指标比较(平均数±标准误差)

Table 1 Comparison of stress resistance indicators in Alhagi sparsifolia under shade and natural light treatments (mean ± SE)

生理参数 Physiological parameter	正常光照 NL	中度遮阴 MS	重度遮阴 SS	降幅A (%)	降幅B (%)
脯氨酸 Praline (mg·g^-1)	0.33 ± 0.01^a	0.25 ± 0.01^b	0.24 ± 0.01^b	22.16	24.07
丙二醛 Malondialdehyde (mg·g^-1)	5.49 ± 0.10^a	4.53 ± 0.14^b	4.00 ± 0.08^c	17.51	27.01
类胡萝卜素 Carotenoids (mg·g^-1)	0.09 ± 0.01^a	0.12 ± 0.02^b	0.14 ± 0.01^c	-33.01	-57.18
可溶性糖 Soluble sugar (mg·g^-1)	20.95 ± 0.69^a	18.42 ± 0.98^a	15.29 ± 0.53^b	12.10	27.05

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