不同微生境下齿肋赤藓(Syntrichia caninervis)非结构性碳水化合物含量的季节动态

doi:10.7522/j.issn.1000-694X.2017.00001

摘要/Abstract

摘要： 齿肋赤藓（Syntrichia caninervis）作为古尔班通古特沙漠苔藓结皮优势种，叶片仅具单层细胞，对环境变化十分敏感。非结构性碳水化合物可以较好地反应植物体对环境因子的响应及适应策略。以齿肋赤藓为研究对象，利用蒽酮比色法研究了生长于3种不同微生境下（活灌丛、死灌丛和裸露地）齿肋赤藓在不同季节（4月初春无雨期、8月高温干燥期）的非结构性碳水化合物含量变化。结果表明：与4月相比，8月齿肋赤藓植株可溶性糖、果糖、淀粉、非结构性碳水化合物总量均显著增加。不同微生境间齿肋赤藓蔗糖含量在4月和8月两个时期差异均达到显著水平，但趋势相反。除可溶性糖在8月表现显著差异外，不同微生境间齿肋赤藓植株在果糖、淀粉及非结构性碳水化合物总量方面均差异不显著。微生境与季节的交互作用对植株可溶性糖与蔗糖含量有显著影响。这可能说明不同微生境与季节所产生的不同水热因子共同调控了齿肋赤藓非结构性碳水化合物总量及各组分含量的差异性变化。

关键词: 古尔班通古特沙漠, 齿肋赤藓(Syntrichia caninervis), 微生境, 非结构性碳水化合物, 季节动态

Abstract: Syntrichia caninervis, the dominant species of moss crust in the Gurbantunggut Desert, with only a single layer of cells, is very sensitive to environmental changes. Non-structural carbohydrates (NSC) can exhibit plants adaptive strategies to environmental factors changes. The contents of NSC and its components of S. caninervis shoot growing in three different microhabitats (alive shrub, dead shrub and exposed area) and two seasons( early spring rain-free period in April and high-temperature drying period in August ) were measured by the method of anthrone-sulfuric acid colorimetric method. The results showed that compared to those in April, the content of soluble sugar, fructose, starch and the total NSC of S. caninervis shoots increased significantly, respectively. The sucrose content of S. caninervis shoots growing in April and August exhibited significant differences among three different microhabitats, but the trend was opposite. Except that the soluble sugar content showed notable difference, no significant differences were observed in the contents of fructose, starch and the total NSC of S. caninervis shoot among three different microhabitats. There was a significant positive correlation between water content of S. caninervis shoot and the content of soluble sugar, fructose, starch, and NSC. Different microhabitats and seasons may shape different hydro-thermal factors regulating the total NSC and its components contents.

Key words: Gurbantunggut Desert, Syntrichia caninervis, microhabitats, non-structural carbohydrates, seasonal dynamics

中图分类号:

Q914.84

朱秉坚, 尹本丰, 张元明. 不同微生境下齿肋赤藓(Syntrichia caninervis)非结构性碳水化合物含量的季节动态[J]. 中国沙漠, 2017, 37(2): 268-275.

Zhu Bingjian, Yin Benfeng, Zhang Yuanming. Seasonal Dynamics of Non-structural Carbohydrates Contents of Syntrichia caninervis among Different Microhabitats[J]. JOURNAL OF DESERT RESEARCH, 2017, 37(2): 268-275.

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