民勤白刺枝条形态对人工增雨的响应

摘要/Abstract

摘要： 为研究全球变化情景下降雨格局变化对干旱区植被的影响，以甘肃民勤的典型荒漠植被白刺灌丛为研究对象，在生长季内人工模拟不同增雨梯度（+0%、+25%、+50%、+75%和+100%多年平均降水量），分析白刺枝条形态特征的变化规律。结果表明,白刺枝条各形态指标间存在很好的相关性。7—9月，75%和100%增雨的枝条长度显著大于0%增雨，枝条新生叶片数只在8月表现为100%增雨显著大于0%增雨。8—9月，100%增雨的营养枝基部直径显著大于0%增雨，成熟叶片数和干物质重量在增雨梯度下各月均不显著。花枝的基部直径在7—9月均表现为100%增雨显著大于0%增雨，7月100%增雨的花枝成熟叶片数显著大于0%增雨，而花枝干物质重量在6—8月表现为100%增雨显著大于0%增雨。针对降雨格局变化，白刺不同枝条形态特征的调节适应机制之间存在着一定的内在协调性。

关键词: 形态特征, 人工增雨, 白刺枝条

Abstract: Under the background of global change, the variation of precipitation pattern might affect vegetation dynamics in arid zone. Nitraria tangutorum shrub, which is one of typical desert vegetation in Minqin County, Gansu Province, was chose to study the effect of precipitation variation on vegetation dynamics. The change pattern of morphological characteristics of N. tangutorum branches was examined under different simulated rainfall increase treatments (0%, 25%, 50%, 75% and 100% increasing of mean annual precipitation, respectively). Result showed that there was significant correlation among branch morphological indexes. The length of N. tangutorum branches in the 75% and 100% rainfall increase treatments was significantly greater than that in no rainfall increase treatment from June to September. The number of new leaves of N. tangutorum branches in the 100% rainfall increase treatment was significantly larger than that in no rainfall increase treatment only in August. In August and September, the basal diameter of the vegetative branches in the 100% rainfall increase treatment was significantly larger than that in no rainfall increase treatment. However, the number of mature leaves and the dry weight of vegetative branches were not significantly different for different rainfall increase treatments. The basal diameter of flower branches in the 100% rainfall increase treatment was significantly larger than that in no rainfall increase treatment from July to September. The number of mature leaves of flower branches in the 100% rainfall increase treatment was significantly larger than that in no rainfall increase treatment in July. Dry weight of flower branches in the 100% rainfall increase treatment was significantly larger than that in no rainfall increase treatment from June to August. Therefore, there is a certain inherent coordination among adaptive mechanisms of different morphological characteristics of N. tangutorum branches under different rainfall increase treatments.

Key words: morphological characteristics, increased rainfall, Nitraria tangutorum branches

中图分类号:

Q948.11

张金鑫, 吴波, 朱雅娟, 卢琦, 李永华. 民勤白刺枝条形态对人工增雨的响应[J]. 中国沙漠, 2012, 32(3): 709-716.

ZHANG Jin-xin, WU Bo, ZHU Ya-juan, LU Qi, LI Yong-hua. Responses of Nitraria tangutorum Branch Morphology to Increased Rainfall in Minqin, Gansu Province[J]. JOURNAL OF DESERT RESEARCH, 2012, 32(3): 709-716.

参考文献

[1]Brown J H,Valone T J,Curtin C G.Reorganization of an arid ecosystem in response to recent climate change[J].Proceedings of the National Academy of Sciences of the United States of America,1997,94:9729-9733.

[2]Weltzin J F,Mcpherson G R.Implications of precipitation redistribution for shifts in temperature savanna ecotones[J].Ecology,2000,81:1902-1913.

[3]Schwinning S,Ehleringer J R.Water use trade-offs and optimal adaptations to pulse-driven arid ecosystems[J].Journal of Ecology,2001,89:464-480.

[4]Smith S D,Huxman T E,Zitzer S F,et al.Elevated CO2 increases productivity and invasive species success in an arid ecosystem[J].Nature,2004,408:79-82.

[5]Schwinning S,Sala O E,Loik M E.Thresholds,memory and seasonality:Understanding pulse dynamics in arid/semiarid ecosystems[J].Oecologia,2004,141:191-193.

[6]Chwinning S,Sala O E.Hierarchy of responses to resource pulses in and and semi-arid ecosystems[J].Oecologia,2004,141:211-220.

[7]Parry M L,Canziani O F,Palutikof J P,et al.Climate Change 2007:Impacts,Adaptation and Vulnerability[R].Cambridge,UK:Cambridge University Press,2007.

[8]施雅风,沈永平,李栋梁,等.中国西北气候由暖干向暖湿转型的特征和趋势探讨[J].第四纪研究,2003,23(2):152-164.

[9]Gao X J,Zhao Z C,Ding Y H,et al.Climate change due to greenhouse effects in China as simulated by regional climate model[J].Advance in Atmosphere Science,2001,18:1224-1230.

[10]翟盘茂,潘晓华.中国北方近50年温度和降水极端事件变化[J].地理学报,2003,58(增刊):1-10.

[11]Giorgi F,Mearns L O,Shields C,et al.Regional nested model simulations of present day and 2×CO2 climate over the central plains of the U.S.[J].Climatic Change,1998,40:47-493.

[12]Jackson R B,Carpenter S R,Dahm C N,et al.Water in a changing world[J].Ecological Applications,2001,11:1027-1045.

[13]徐贵青,李彦.共生条件下三种荒漠灌木的根系分布特征及其对降水的响应[J].生态学报,2009,29(1):130-137.

[14]许皓,李彦,邹婷,等.梭梭(Haloxylon ammodendron)生理与个体用水策略对降水改变的响应[J].生态学报,2007,27(12):5019-5028.

[15]李彦,许皓.梭梭对降水的响应与适应机制——生理、个体与群落水平碳水平衡的整合研究[J].干旱区地理,2008,30(3):313-323.

[16]张丽华,陈亚宁,李卫红,等.准噶尔盆地两种荒漠群落土壤呼吸速率对人工降水的响应[J].生态学报,2009,29(6):2819-2826.

[17]李秋艳,赵文智.5种荒漠植物幼苗对模拟降水量变化的响应[J].冰川冻土,2006,28(3):414-420.

[18]肖春旺,周广胜,马风云.施水量变化对毛乌素沙地优势植物形态与生长的影响[J].植物生态学报,2002,26(1):69-76.

[19]肖春旺,董鸣,周广胜,等.鄂尔多斯高原沙柳幼苗对模拟降水量变化的响应[J].生态学报,2001,21(1):171-176.

[20]Xu H,Li Y.Water-use strategy of three cental Asian desert shrubs and their responses to main pulse events[J].Plant and Soil,2006,285:5-17.

[21]邹婷,李彦,许皓,等.不同生境梭梭对降水变化的生理响应及形态调节[J].中国沙漠,2011,31(2):428-435.

[22]梁少民,张希明,曾凡江,等.沙漠腹地乔木状沙拐枣对灌水量的生理生态响应[J].中国沙漠,2010,30(6):1348-1353.

[23]毛伟,李玉霖,赵学勇,等.3种藜科植物叶特性因子对土壤养分、水分及种群密度的响应[J].中国沙漠,2009,29(3):468-473.

[24]朱军涛,李向义,张希明,等.灌溉对疏叶骆驼刺（Alhagi sparsifolia）幼苗光合生理指标及渗透物质的影响[J].中国沙漠,2009,29(4):697-702.

[25]高志海,崔建国,刘生龙,等.民勤沙区白刺果实性状的变异性研究[J].中国沙漠,1998,18(3):244-248.

[26]Noble J C.The effects of emus (Dromaius novaehollandiae Latham) on the distribution of the nitre bush (Nitraria billardieri DC.)[J].Journal of Ecology,1975,63:979-984.