紫外线B辐射对几种植物种间竞争的影响

应用生态学报 ›› 2003, Vol. ›› Issue (8): 1322-1326.

紫外线B辐射对几种植物种间竞争的影响

岳明¹, 王勋陵^1,2

1. 西北大学生命科学学院, 西安 710069;
2. 兰州大学生命科学学院, 兰州 730000

收稿日期:2001-09-17 修回日期:2002-01-10 出版日期:2003-08-15
通讯作者: 王勋陵
基金资助:
国家自然科学基金资助项目(3967013239970126)

Effect of enhanced UV-B radiation on competition among several plant species

YUE Ming¹, WANG Xunling^1,2

1. School of Life Science, Northwest University, Xi'an 710069, China;
2. School of Life Science, Lanzhou University, Lanzhou 730000, China

Received:2001-09-17 Revised:2002-01-10 Online:2003-08-15

摘要/Abstract

摘要： 对大田条件下增强的紫外线B(UV-B280～315nm,约相当于15%臭氧层衰减)对小麦和野燕麦等4个种对的竞争性平衡的影响进行了研究.结果表明,对照和UV-B处理时小麦和野燕麦的密度制约死亡规律没有显著差异,相对较大的竞争压力加强了UV-B对这两个物种生物量降低的效应.UV-B辐射处理后,按单株生物量和地上部生物量,UV-B增强了小麦对野燕麦的竞争优势,但是以单株籽粒数及籽粒重为依据的k_1-2值在紫外辐射处理后却下降.竞争性平衡的改变伴随着两者总生物量的显著下降,特别是在较高的密度条件下.紫外辐射对其它3个种对的竞争性平衡有着不同程度与方向上的影响.一般情况下UV-B使竞争性平衡向有利于单子叶植物的方向发展.这一结果暗示,竞争胁迫,特别是种间竞争对正确评估UV-B辐射增强对农田生态系统的影响是至关重要的.

Abstract: The effect of enhanced UV-B radiation (280～315 nm, approximating a 15% ozone layer reduction) on competitive interaction between spring wheat (Triticum aestivum) and wild oat (Avena fatua) was examined in the field. The density dependent mortality of both wheat and wild oat did not exhibit a significant difference between control and UV-B treatments. Arelatively high degree of competitive stress enhanced the effect of UV-B stress on biomass reduction.Under UV-B enhancement,the relative competitive status of wheat in terms of total biomass and aboveground biomass increased,but decreased when based upon grain production. Shifts in competitive balance occurred with significant changes in total biomass, especially when plants grew at higher densities in monocultures and mixtures. There were different effects in direction and intensity of UV-Bradiation on competition balance of the other three species pairs, but in general, the effect of UV-Bwas in favor of monocotyledonous. The results implied that total degree of competitive stress,especially interspecific competition,might be crucial to assess the effect of UV-B enhancement on agriculture ecosystem properly.

中图分类号:

Q945.154

岳明, 王勋陵. 紫外线B辐射对几种植物种间竞争的影响[J]. 应用生态学报, 2003, (8): 1322-1326.

YUE Ming, WANG Xunling. Effect of enhanced UV-B radiation on competition among several plant species[J]. Chinese Journal of Applied Ecology, 2003, (8): 1322-1326.

参考文献

[1] Barnes PW, Maggard S, Holman SR, et al. 1993. Intraspecific vaiationin seitivity to UV-B radiation in rice. Crop Sci, 33:1041～1046
[2] Barnes PW, Beyschlag W, Ryel R, et al. 1990. Plant competition for light analyzed with a multispecies canopy model Ⅲ . Influence of canopy structure in mixtures and monocultures of wheat and wildoat. Oecologia, 82: 560～566
[3] Barnes PW, Jordan PW, Gold WG, et al. 1988. Competition, morphology and canopy structure in wheat (Triticum aestivum L.) and wild oat (Avena fatuaL.) exposed to enhanced ultraviolet-B radiation. Funct Ecol, 2: 319～330
[4] Beyschlag W, Barnes PW, Flint SD, et al. 1988. Enhanced UV-B radiation has no effect on photosynthetic characteristics of wheat (Triticum aestivum L.) and wild oat (Avena fatua L.) under greenhouse and field conditions. Photosynthetica, 22 (4): 516～525
[5] Beyschlag W, Barnes PW, Ryel R, et al. 1990. Plant competition for light analyzed with a multispecies canopy model Ⅱ . Influence of photosynthetic characteristics on mixtures of wheat and wild oat.Oecologia, 82 (3) :374～380
[6] Blackshow RE. 1993. Downy brome (Bromus tectorum) density and relative time of emergence affects interference in winter wheat (Triticum aestivum). Weed Sci, 41: 551～556
[7] Caldwell MM, Teramura AH, Tevini M. 1989. The changing solar ultraviolet climate and the ecological consequences for higher plants. Trends Ecol Evol, 4: 363～367
[8] Caldwell MM. 1971. Solar ultraviolet radiation and the growth and development of higher plant. In: Giese AC ed. Photophysiology, Vol. 6. New York: Academic Press. 131～177
[9] Caldwell MM. 1977. The effects of solar UV-B radiation (280 315 nm) on higher plants: Implication of stratospheric ozone reduction. In: Castellani A ed. Research in Photobiology. London: Plenum Publishing Co. 597～607
[10] Caldwell MM, Flint SD. 1993. Implications of increased solar UV-B for terrestrial vegetation. In: Chanin ML ed. The Role of the Stratosphere in Global Change. Heidelberg: Springer-Verlag. 495～516
[11] Caldwell MM, Teramura AH, TiviniM, etal.1995. Effects of increased solar ultraviolet radiation on terrestrial plant. Ambio, 24:166～173
[12] Carlson HL, Hill JE. 1985. Wild oat (Avena fatua) competition with spring wheat: Effects of nitrogen fertilization. Weed Sci, 34:29～33
[13] Carlson HL, Hill JE. 1985. Wild oat (Avena fatua) competition with spring wheat: Plant density effects. Weed Sci, 33:176～181
[14] Firbank LG, Watkinson AR. 1985. On the analysis of competition within two-species mixtures of plant. J Appl Ecol, 22: 503～517
[15] Fox FM, Caldwell MM. 1978. Competitive interation in plant populations exposed to supplementary ultroviolet-B radiation. Oecologia, 36:173～190
[16] Gerry AK, Wilson SD. 1995. The influence of initial size on the competitive responses of six plant species. Ecology, 76(1) :272～279
[17] Gold WG, Caldwell MM. 1983. The effects of ultraviolet-B radiation on plant competition in terrestrial ecosystems. Physiol Plant, 58 :435～444
[18] Harper JL. 1977. Population Biology of Plants. New York: Aca demic Press.
[19] Martin MP, Field J. 1987. Competition between vegetative plants of wild oat (Avena fatua L.) and wheat (Tritivum aestivum L.). Weed Res, 27:119～124
[20] Silvertown JW, Doust JL. 1993. Introduction to Plant PopulationBiology. Oxford: Blackwell Scientific Publications. 116～140
[21] Teramura AH, Ziska LH, Sztein AE. 1991. Changes in growth and photosynthetic capacity of rice with increased UV-B radiation. Physiol Plant, 83: 373～380
[22] Yue M(岳明),Wang X-L(王勋陵).1999.Effect of enhancedultraviolet radiation on competitive balance of wheat and oat-Thestructure of biomass and canopy.Acta Sci Circums(环境科学学报),19(5):526 531(in Chinese)