增温与放牧对矮嵩草草甸4种植物气孔密度和气孔长度的影响
Effects of temperature increase and grazing on stomatal density and length of four alpine Kobresia meadow species,Qinghai-Tibetan Plateau
查看参考文献39篇
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文摘
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设计增温和放牧耦合试验研究增温和放牧对高寒植物气孔密度和气孔长度的影响,选择矮嵩草(Kobresia hum ilis),高山唐松草(Thalictrum aplinum),垂穗披碱草(Elymus nutans Griseb.)和麻花艽(Gentiana stram inea)作为试验材料.结果表明增温与放牧分别影响这4个物种气孔形态参数的不同方面:温度使4个物种气孔长度一致性地变小(P<0.05),放牧使气孔密度和潜在气孔导度指数(PCI)一致性地上升(P<0.05).气孔密度对增温的响应趋势和气孔长度对放牧的响应趋势在不同物种间存在差异.气孔长度减小可能是对增温引起的水分胁迫的响应,气孔密度和潜在气孔导度指数上升反映出四种植物在本研究相应的放牧强度下存在补偿性生长的可能 |
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其他语种文摘
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Low temperature is widely recognized as the primary limiting factor in plant growth in alpine meadows of the Qinghai-Tibetan plateau.Warming is thus supposed to alleviate temperature limitation in the area.Livestock grazing is the predominant land use in the area and is the main anthropogenic factor affecting plant growth.Grazing,while diminishing total leaf area,may raise the level of nutrient elements in the soil,and thus have the opposite effect on plant growth.Stomata apparatus play important roles in controlling the passage of CO2 into and out from plants.Since it is difficult to directly measure photosynthesis rates for most species in the area,changes in stomatal characteristics could be used as proxies to understand how the assimilation rates of plants change under warming or grazing treatments.A two-way factorial design(warming×grazing) experiment was carried out at the Haibei Research Station in Qinghai province,China.A temperature free-air controlled enhancement(T-FACE) system with arrays of infrared radiation heaters deployed by Kimball et al. was used to elevate vegetation canopy temperatures.The setpoint differences in summer were 1.2℃ in daytime and 1.7℃ at night-time,while in winter daytime and night time differences were 1.5℃ and 2.0℃ respectively.Two sheep per plot(3 m2) grazed once a month from July to September,representing a moderate level of above ground biomass utilization.Four alpine meadow species were selected in August 2008 after two years of treatment: Thalictrum aplinum,Kobresia humilis,Gentiana straminea,Elymus nutans Griseb.Fully mature leaves were selected to measure stomatal density(SD) and stomatal length(SL) and the length between the junctions of the guard cells at each end of the stoma using a Motic microscope system(Motic BA200,China).Warming decreased the SL of all four species(P=0.037),by 3.3%,1.9%,3.9%,2.7% in T.aplinum,K.humilis,G.straminea.E.nutans,respectively.Warming affected SD in a species-specific way,as indicated by a marginally significant(P=0.086) interaction between warming and species in ANOVA.Grazing increased the SD of all four species,by 12.5%,15.7% and 15.9%,2.4% in T.aplinum,K.humilis,G.straminea.E.nutans respectively.Grazing had no statistically significant effects on SL(P=0.907).Potential conductance index(PCI) was also calculated for all four species using the formula(stomatal length)2 stomatal density.Grazing increased the PCI for all four species(P=0.000),while warming decreased the PCI,but with a lower level of significance(P=0.068).There were no significant interaction effects between warming and grazing on SD,SL and PCI.The decline in SL subjected to warming might be the result of warming-generated soil drought.The rise in SD and PCI induced by grazing may imply an increase in assimilation rate per leaf area at a given grazing intensity.Since both SD and SL contributed to maximum stomatal conductance,their responses to grazing and warming counteracted each other in the case of maximum stomatal conductance.It may be the tendency that SD increase and SL decrease in grazing alpine meadow under future warming |
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来源
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生态学报
,2010,30(24):6961-6969 【核心库】
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关键词
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气孔密度
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气孔长度
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潜在气孔导度指数
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全球变暖
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放牧
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高寒草甸
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地址
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中国科学院研究生院, 北京, 100049
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中国科学院西北高原生物研究所, 中国科学院植物适应与进化重点实验室, 西宁, 810001
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-0933 |
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学科
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畜牧、动物医学、狩猎、蚕、蜂 |
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基金
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中国科学院知识创新工程西部行动计划项目
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中国科学院研究生院科研启动基金支持
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中国科学院“百人计划”项目
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文献收藏号
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CSCD:4102719
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参考文献 共
39
共2页
|
|
1.
IPCC.
Intergovernmental Panel on Climate Change: Impacts, Adaptation and Vulnerability,2007
|
被引
1
次
|
|
|
|
|
2.
Liu X D. Climatic warming in the Tibetan Plateau during recent decades.
International Journal of Climatology,2000,20(14):1729-1742
|
被引
267
次
|
|
|
|
|
3.
石福孙. 模拟增温对川西北高寒草甸两种典型植物生长和光合特征的影响.
应用与环境生物学报,2009,15(6):750-755
|
被引
33
次
|
|
|
|
|
4.
Beyschlag W. Towards a causal analysis of stomatal patchiness: the role of stomatal size variability and hydrological heterogeneity.
Acta Oecologica-Intemational Journal of Ecology,2001,22(3):161-173
|
被引
3
次
|
|
|
|
|
5.
Xu Z Z. Responses of leaf stomatal density to water status and its relationship with photosynthesis in a grass.
Journal of Experimental Botany,2008,59(12):3317-3325
|
被引
45
次
|
|
|
|
|
6.
Franks P J. Maximum leaf conductance driven by CO2 effects on stomatal size and density over geologic time.
Proceedings of the National Academy of Sciences of the United States of America,2009,106(25):10343-10347
|
被引
45
次
|
|
|
|
|
7.
Hetherington A M. The role of stomata in sensing and driving environmental change.
Nature,2003,424:901-908
|
被引
205
次
|
|
|
|
|
8.
周华坤. 青藏高原高寒灌丛植被对长期放牧强度试验的响应特征.
西北植物学报,2008,28(10):2080-2093
|
被引
9
次
|
|
|
|
|
9.
仁青吉. 放牧强度对青藏高原东部高寒草甸植物群落特征的影响.
草业学报,2009,18(5):256-261
|
被引
76
次
|
|
|
|
|
10.
赵彬彬. 放牧对青藏高原东缘高寒草甸群落27种植物地上生物量分配的影响.
生态学报,2009,29(3):1596-1606
|
被引
42
次
|
|
|
|
|
11.
Zhang Z. Responses of Artemisia frigida Willd. (Compositae) and Leymus chinensis (Trin.) Tzvel. (Poaceae) to sheep saliva.
Journal of Arid Environments,2007,70(1):111-119
|
被引
13
次
|
|
|
|
|
12.
董世魁. 放牧强度对高寒地区多年生混播禾草叶片特征及草地初级生产力的影响.
中国农业科学,2004,37(1):136-142
|
被引
24
次
|
|
|
|
|
13.
马涛. 青藏高原东部高寒草甸群落生物量和补偿能力对施肥与刈割的响应.
生态学报,2007,27(6):2288-2293
|
被引
25
次
|
|
|
|
|
14.
张靖乾. 刈割频次对高寒草甸群落特征和初级生产力的影响.
草地学报,2008,16(5):491-496
|
被引
5
次
|
|
|
|
|
15.
李英年. 海北高寒草甸生态系统定位站气候、植被生产力背景的分析.
高原气象,2004,23(4):558-567
|
被引
130
次
|
|
|
|
|
16.
Kimball B A. Infrared heater arrays for warming ecosystem field plots.
Global Change Biology,2008,14:309-320
|
被引
15
次
|
|
|
|
|
17.
蔺兴武.
增温与土地利用变化对青藏高原高寒草甸生态系统温室气体通量影响的研究,2008
|
被引
1
次
|
|
|
|
|
18.
Poole I. Variations in stomatal density and index: implications for palaeoclimatic reconstructions.
Plant, Cell and Environment,1996,19:705-712
|
被引
24
次
|
|
|
|
|
19.
Holland N. Stomatal length lorrelates with elevation of growth in four te perate species.
Journal of Sustainable Forestry,2009,28:63-73
|
被引
8
次
|
|
|
|
|
20.
左闻韵. 植物气孔对大气CO2浓度和温度升高的反应.
生态学报,2005,25(3):555-574
|
被引
3
次
|
|
|
|
|
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