globalchange  > 气候变化与战略
CSCD记录号: CSCD:5467626
论文题名:
增温、施氮、CO_2浓度升高对羊草(C_3)、芦苇(C_4)植硅体组合的影响
其他题名: PHYTOLITH PRODUCTION TESTS ON MODERN PLANTS IN SIMULATED WARMING, EXCESSIVE NITROGEN, ELEVATED CO_2 CONDITIONS
作者: 介冬梅1; 冯滢瑛1; 郭继勋2; 刘洪妍1; 刘利丹1; 李楠楠1
刊名: 第四纪研究
ISSN: 1001-7410
出版年: 2015
卷: 35, 期:4, 页码:139-146
语种: 中文
中文关键词: C_3和C_4植物 ; 植硅体 ; 全球变暖 ; 氮沉降 ; CO_2浓度升高
英文关键词: C_3 and C_4 plant ; phytolith ; global warming ; nitrogen deposition ; elevated CO_2 concentration
WOS学科分类: GEOSCIENCES MULTIDISCIPLINARY ; PALEONTOLOGY
WOS研究方向: Geology ; Paleontology
中文摘要: 研究未来全球变暖和氮沉降下C_3、C_4植物植硅体的变化规律,对松嫩草原优势群落演替方向的预判、古植被及古气候的重建和全球环境变化的预测等工作具有重要意义。本文选取松嫩草原的优势物种羊草(Leymus chinensis, C_3)和芦苇(Phragmites communis,C_4),对其进行模拟增温、施氮、CO_2浓度升高处理,研究叶片部位植硅体的组合规律及形态变化特征,试图寻找在改变某一单一环境要素条件下,C_3、C_4植物所含各类型植硅体百分含量及形态的变化规律,以探究C_3、C_4植物植硅体对不同环境因素响应的异同。结果显示:CO_2浓度升高、增温对羊草植硅体发育具有促进作用,对芦苇植硅体发育起抑制作用;氮素过高对羊草和芦苇植硅体的发育都不利,但增温能减轻施氮对羊草植硅体的负面效应。棒型、板型、方型、块状、蜂窝状植硅体对模拟增温、施氮、CO_2浓度升高反应敏感,可作为指示环境变化的新指标。
英文摘要: As trends of warming, elevated C0_2 concentration and excessive nitrogen deposition are expected to continue, it is necessary to know the consequences of environmental changes on terrestrial ecosystem process and services such as the orientation of community succession. Becasuse the deposition of phytoliths are controlled by physiological stages of plants,phytoliths are therefore allowing researchers to acquire more detailed information on botany. Moreover, as silica could perform functions of protecting plants from pests or diseases as well as reducing the toxicity of salt in crops, the content and size of phytoliths have important influences on plants. Thus, we set the study area at a grassland ecosystem experimental station (44°30′ ~ 44°45'N, 123°31′~123°56'E) of Northeast Normal University within the southwestern region of the Songnen Grassland ( Changling County, Jilin Province), selected two types of the dominant plants, Leymus chinensis ( C_3) and Phragmites communis (C_4),treated them by infrared radiator, OTC (an open-top chamber to elevate CO_2 concentration),and artificial nitrogen fertilization; and extracted their phytoliths to assess their responses to temperature and environmental changes. We extracted and then analyzed those phytoliths in leaves,paid greater attention to morphological and content variations of phytoliths within these two species when a certain environmental condition changes, trying to acquire the responses. The data show : warming and elevated C0_2 concentration had positive effects on phytoliths in L. chinensis, while the deposit of phytoliths in P. communis is restrained ; excessive nitrogen had negative effects on both L. chinensis and P. communis phytoliths, whereas warming could reduce the negative impact on excessive nitrogen in L. chinensis phytoliths. As the suppression of phytolith growth would reduce the mechanical strength and the insect-resistance capacity of plants,it is necessary to pay more attention to the physiological and biochemical changes in L. chinensis and P. communis. Elongate,blocky polyhedral,laminate,favose and rectangle were more sensitive to warming, elevated C0_2 concentration and excessive nitrogen, and could become some new indicators of environmental changes. In contract, phytolith oriented in short cells ( rondel and saddle) were more stable, and were not disappeared when environment was disadvantage. This result demonstrated the taxonomic significance of short-cell phytolith in the grass family.
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/149251
Appears in Collections:气候变化与战略

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作者单位: 1.东北师范大学地理科学学院, 国家环境保护湿地生态与植被恢复重点实验室
2.植被生态科学教育部重点实验室, 长春, 吉林 130024, 中国
3.东北师范大学草地研究所, 植被生态科学教育部重点实验室, 长春, 吉林 130024, 中国

Recommended Citation:
介冬梅,冯滢瑛,郭继勋,等. 增温、施氮、CO_2浓度升高对羊草(C_3)、芦苇(C_4)植硅体组合的影响[J]. 第四纪研究,2015-01-01,35(4):139-146
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