不同生育期四合木抗氧化系统的变化及生境间差异

摘要/Abstract

摘要： 对不同生境四合木种群特征、根际土壤理化性质进行了比较分析,对不同生育期四合木抗氧化系统的变化和生境间差异性进行了探讨。结果表明:①不同生境四合木种群密度、盖度、年龄结构存在显著差异,且低山、台地、丘陵种群所处生境有利于幼苗更新,其密度和盖度均显著大于高平原和倾斜平原种群\.②不同生境四合木根际土壤理化性质存在显著差异。对其进行聚类分析分为两类:低山、台地、丘陵为一类（A类）；高平原、倾斜平原为一类（B类）\.方差分析表明,A类样地土壤营养元素（N、P、K）和微量元素（全Fe、Mn、Zn、B、Mo与有效量）、土壤有机质含量及土壤含水量都显著高于B类。③不同生境四合木体内MDA含量、抗氧化酶类SOD、POD、CAT、AsA-POD、GR活性和非酶抗氧化剂GSH、AsA含量均随5月（营养期）、6月（花期）、8月（果期）而不断升高,二者协同作用共同抵抗干旱胁迫诱导的氧化伤害。④不同生境四合木抗氧化系统存在差异性:A类样地受到的膜脂过氧化程度相对较低,其体内的抗氧化酶活性和抗氧化剂含量较低；而B类样地四合木根际土壤干旱程度较高,土壤偏贫瘠,植物体通过提高一定幅度的抗氧化酶活性和抗氧化剂含量以清除干旱导致的氧化伤害。

关键词: 生境, 四合木, 抗氧化系统, 差异性

Abstract: The physical and chemical characters of soil, the density and coverage and age-class structure of T. mongolica population in different habitats were analyzed. Besides, the change in antioxidant system of T. mongolica in different growth stages and habitats were studied. Results are showed as follows: (1)There is a significant difference in density, coverage and age-class structure of T. mongolica population in different habitats. The habitats of low mountain, upland and hill are beneficial to seedling renewal, and the population density and coverage in the three habitats are significantly higher than that in high plain and rude plain. (2)The physical and chemical characters of soil are significantly different. Cluster analysis shows that the habitat types can be classified into group A (just low mountains, upland and hill) and group B (just high plain and rude plain). The contents of organic matter, water, nutrition elements (N, P, K), and micro-elements（total and available Fe, Mn, Cu, Zn, Mo, B）in the group A are significantly higher than that in group B. (3)The content of MDA, activities of enzymatic antioxidants (SOD, POD, CAT, AsA-POD, GR) and contents of non-enzymatic antioxidants (AsA, GSH) in different growth stages are all showed as values in August>in June>in May, and the anti-oxidation of T. mongolica results from the mutual effects of enzymatic antioxidants and non-enzymatic antioxidants. (4)The antioxidant systems are different among the five habitats. The membrane lipid peroxidation of T. mongolica in group A plots is relatively low, so the activities of enzymatic antioxidants and contents of non-enzymatic antioxidants are relatively low. The drought stress to T. mongolica is relatively significant and the soil is relatively impoverish in group B plots, so the activities of enzymatic antioxidants and contents of non-enzymatic antioxidants are relatively high.

Key words: habitat, Tetraena mongolica, antioxidant system, variety

中图分类号:

Q945.1

石松利, 王迎春, 李骁, 周红兵. 不同生育期四合木抗氧化系统的变化及生境间差异[J]. 中国沙漠, 2012, 32(3): 771-779.

SHI Song-li, WANG Ying-chun, LI Xiao, ZHOU Hong-bing. Variety of Antioxidant System of Tetraena mongolica in Different Growth Stages and Habitats[J]. JOURNAL OF DESERT RESEARCH, 2012, 32(3): 771-779.

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