陕北黄土丘陵区撂荒群落共存种活性氧清除指标对水分胁迫的响应
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引用本文:张赟赟,杜 峰,周 敏,潘天辉.陕北黄土丘陵区撂荒群落共存种活性氧清除指标对水分胁迫的响应[J].西北植物学报,2019,39(8):1444~1454
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张赟赟1,杜 峰1,2*,周 敏1,潘天辉1 (1 西北农林科技大学陕西杨陵 7121002 中国科学院水利部水土保持研究所陕西杨陵 712100) 
基金项目:国家重点研发计划项目(2017YFC0504504)和国家自然科学基金(41771322)
中文摘要:群落共存种对环境变化的生理生态响应差异是群落演替的重要因素,其中活性氧清除是生理生态响应的重要方面。该研究以黄土丘陵区10个常见撂荒群落共存种(阿尔泰狗娃花、猪毛蒿、铁杆蒿、茭蒿、小花棘豆、达乌里胡枝子、白羊草、冰草、中华隐子草和无芒隐子草)为研究对象,测定了不同水分处理条件下(适宜水分、中度胁迫及重度胁迫)生长季中3个月份(8、9和10月)个体和种群的生长表现(个体株高、生物量和种群存活率),及主要活性氧清除指标[类胡萝卜素含量、超氧化物歧化酶(SOD)活性和谷胱甘肽(GSH)含量],分析群落共存种的生态适合度和活性氧清除指标对水分处理的响应差异及其相互关系,以明确演替生态位置上各指标的变化趋势。结果表明:(1)随水分胁迫程度的增加,演替前期种——猪毛蒿的的适合度有所下降,后期种——白羊草有所上升。(2)GSH和类胡萝卜素含量均随水分胁迫程度增强显著升高。(3)类胡萝卜素含量、SOD活性和GSH含量存在显著的种间差异,其中达乌里胡枝子的类胡萝卜素含量、小花棘豆的SOD活性、中华隐子草的SOD活性和GSH含量、无芒隐子草的类胡萝卜素含量和GSH含量均相对较高,且这3个指标的生长季变化也较为明显,8月份类胡萝卜素含量和GSH含量相对较高,而10月份GSH含量和SOD活性相对较高。(4)演替生态位置上,10个共存种在演替序列上以前期种的适合度和类胡萝卜素含量相对较低,而演替后期种相对较高,表明演替后期的植物较为耐旱。
中文关键词:群落共存种  生理指标  耐旱性  适合度  水分胁迫
 
Responses of Reactive Oxygen Quenching Indexes among Co existing Species of Old Field Communities in Loess Plateau of Northern Shaanxi Province to Water Deficits
Abstract:The difference of ecophysiological and ecological response of community coexisting species to environmental is the important factor of community succession, of which, reactive oxygen scavenging is an important aspect of eco physiology response. This paper takes on 10 kinds of common abandoned co existing species in the Loess Plateau as study object, Ten co existing species include Heteropappus hispidus, Artemisia scoparia, Artemisia sacrorum, Artemisia giraldii, Oxytropis glabra, Lespedeza dahurica, Bothriochloa ischaemum, Agropyron cristatum, Cleistogenes chinensis and Cleistogenes songorica. We determines the growth performance of individuals and populations, the main active oxygen removal indicators in the three months (August, September and October) of the growing season under different water treatment conditions (suitable water, moderate and severe stress). The measured growth performance indicators are individual plant height, biomass and population survival rate, active oxygen quenching indicators contain carotenoid content, superoxide dismutase (SOD) activity and glutathione (GSH) content. In this paper, the response differences and their interrelation of community coexisting species to water treatment on ecological suitability and reactive oxygen scavenger index are calculated and analyzed. The variation trend of the above indicators in succession ecological position is also demonstrated. The results show: (1) with the increase of water stress degree, the fitness of Artemisia scoparia in the succession early stage decreased, while the late growth of Bothriochloa ischaemum increased. (2) GSH and carotenoid enhanced with the water stress degree, both contents increased significantly. (3) There are prominent varietals diversities between carotenoids content, SOD activity and GSH content. Among them, the carotenoid content of Lespedeza dahurica, the SOD activity of Oxytropis glabra, the SOD activity and GSH content of Cleistogenes chinensis, and the carotenoid content and GSH content of Cleistogenes songorica were relatively high. Besides, the growth season variation of the above three indicators was also relatively obvious, the carotenoid and GSH contents in August were relatively high, while the GSH content and SOD activity in October were relatively high. (4) In the successional ecological position, ten co existing species had relatively low levels of fitness and carotenoid content in the previous succession sequence, while the post successive species were relatively higher, which indicates that the plants in the later stage of succession are more drought tolerant.
keywords:co existing species  physiological index  drought tolerance  fitness  water stress
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