塔克拉玛干沙漠南缘头状沙拐枣幼苗生长和生物量分配对不同灌溉量的响应

摘要/Abstract

摘要：

水是荒漠生态系统中首要限制因子。由于水分限制程度不同,植物幼苗在生长过程中表现出不同的适应策略。在塔克拉玛干沙漠南缘的沙漠-绿洲过渡带,设计了0 mm（处理A）、100 mm（处理B）、200 mm（处理C）3种不同的灌溉量,对头状沙拐枣幼苗生长和生物量分配展开实验性研究。结果表明:①处理A比处理B和处理C地下生物量均有所增加;不同灌溉条件下,头状沙拐枣幼苗的根冠比均小于1,随灌溉量的减少头状沙拐枣幼苗的根冠比从0.19增加到0.32;即头状沙拐枣通过改变根系生物量分配适应水分条件变化。②随灌溉量的减少, 头状沙拐枣幼苗主根垂直深度和水平根幅均呈增加趋势。处理A时,头状沙拐枣幼苗根系深度达180 cm以上,处理B和C的根系深度均低于160 cm,表明头状沙拐枣幼苗通过根系的伸长生长来适应水分减少。③在生长过程中,头状沙拐枣通过老同化枝枯落适应土壤水分减少。④株高和冠幅随着灌溉量增加呈先增加后减小趋势,基径随着灌溉量的增加而增加,地上生长指标在不同处理间均无显著差异。

关键词: 生物量分配, 头状沙拐枣幼苗, 灌溉量, 生长特性

Abstract:

Water is a key limiting factor for desert ecosystem, and plant seedlings exhibit various adaptive strategies in different irrigation treatments. Our research on the effects of three irrigation treatments on the seedlings growth and biomass distribution of Calligonum caput-medusae was conducted at the southern fringe of the Taklimakan Desert, Northwest China. The three irrigation treatments were 0 mm (treatment 1), 100 mm (treatment 2) and 200 mm (treatment 3), and the irrigation was applied once during the growing season. Changes in biomass allocation, root depth distribution, root surface area, root/shoot ratio, litter mass/aboveground mass rate were investigated. The root biomass of C. caput-medusae seedlings in treatment 1 is higher than in the other two treatments. Root/shoot ratio increases from 0.16 to 0.32 with decreasing irrigation treatments. The vertical length of main root and horizonal root range of C. caput-medusae seedlings is larger in treatment 1 than in the two other treatments. Root length in treatment 1 exceeds 180 cm, and that in the other two treatments is less than 160 cm. So C. caput-medusae adapts to soil water decreasing by increasing root length. Litter mass of C. caput-medusae seedlings increases with decrease of irrigation amounts. With increase of irrigation amounts, the plant height and crown width of C. caput-medusae seedlings increase at first and then decrease, and the basal stem increases continuously, but there is no significant difference among the three treatments.

Key words: biomass allocation, seedlings, Calligonum caput-medusae, irrigation amount, growth characteristics

中图分类号:

Q945

刘镇1,2,3, 曾凡江1,3*, 安桂香1,2,3, 刘波1,2,3, 李海峰1,2,3, 张利刚1,2,3, 高欢欢1,2,3. 塔克拉玛干沙漠南缘头状沙拐枣幼苗生长和生物量分配对不同灌溉量的响应[J]. 中国沙漠, 2012, 32(6): 1655-1661.

LIU Zhen1,2,3, ZENG Fan-jiang1,3, AN Gui-xiang1,2,3, LIU Bo1,2,3, LI Hai-feng1,2,3, ZHANG Li-gang1,2,3, GAO Huan-huan1,2,3. Influence of Irrigation Amounts on Seedling Growth and Biomass Allocation of Calligonum caput-medusae at the Southern Fringe of the Taklimakan Desert[J]. JOURNAL OF DESERT RESEARCH, 2012, 32(6): 1655-1661.

参考文献

[1]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,2008,31(3):313-323.

[2]张立运,夏阳,安尼瓦尔,等.塔克拉玛干沙漠植被的生态学特征和持续发展[J].干旱区研究,1995,12(3):26-33.

[3]鲍超,方创琳.干旱区水资源开发利用对生态环境影响的研究进展与展望[J].地理科学进展,2008,27(3):38-46.

[4]黄文达,王彦荣,胡小文.三种荒漠植物种子萌发的水热响应[J].草业学报,2009,18(3):171-177.

[5]毛舒燕,刘东焕,姜闯道,等.水分胁迫条件下草莓克隆分株间水分调控及其对光合功能的影响[J].生态学报,2009,29(12):6446-6457.

[6]曾凡江,刘波,贺俊霞,等.骆驼刺幼苗氮素特征对不同灌溉量的响应[J].生态学报,2010,30(8):2118-2127.

[7]郭立冬,何兴东.不同气温与土壤湿度条件下籽蒿幼苗的表型可塑性[J].中国沙漠,2011,31(4):987-991.

[8]Neumann P M.Coping mechanisms for crop plants in drought-prone environments[J].Annals of Botany,2008,101(7):901-907.

[9]蒋礼学,李彦.三种荒漠灌木根系的构形特征与叶性因子对干旱生境的适应性比较[J].中国沙漠,2008,28(6):1118-1114.

[10]曾凡江,郭海峰,刘波,等.疏叶骆驼刺幼苗根系生态学特性对水分处理的响应[J].干旱区研究,2009,26(6):852-858.

[11]Ho M D,McCannon B C,Lynch J P.Optimization modeling of plant root architecture for water and phosphorus acquisition[J].Journal of Theoretical Biology,2004,226:331-34.

[12]Pregitzer K,Hendrick R,Fogel R.The demography of fine roots in response to patches of water and nitrogen[J].New Phytologist,1993,125:575-580.

[13]单立山,张希明,王有科,等.水分条件对塔里木沙漠公路防护林植物幼苗生长及生物量分配的影响[J].科学通报,2008,53(增刊Ⅱ):82-88.

[14]田媛,李建贵,赵岩.梭梭幼苗死亡与土壤和大气干旱的关系研究[J].中国沙漠,2010,30(4):378-384.

[15] Singh G.Influence of soil moisture and nutrient gradient on growth and biomass production of Calligonum polygonoides in Indian desert affected by surface vegetation[J].Journal of Arid Environments,2004,56:541-558

[16] Zeng F J,Bleby T M,Landman P A,et al.Water and nutrient dynamics in surface roots and soils are not modified by short-term flooding of phreatophytic plants in a hyperarid desert[J].Plant and Soil,2006,279:129-139.

[17] Gries D,Foetzki A,Arndt S K,et al.Production of perennial vegetation in an oasis-desert transition zone in NW China-Allometric estimation,and assessment of flooding and use effects[J].Plant Ecology,2005,181:23-43.

[18]李向义,Thomas F M,Foetzki A,等.自然状况下头状沙拐枣对水分条件变化的响应[J].植物生态学报,2003,27(4):516-521.

[19]苏培玺,赵爱芬,张立新,等.荒漠植物梭梭和沙拐枣光合作用、蒸腾作用及水分利用效率特征[J].西北植物学报,2003,23(1):11-17.

[20]Shipley B,Meziane D. The balanced-growth hypothesis and the allometry of leaf and root biomass allocation[J].Functional Ecology,2002,16:326-331.

[21]肖冬梅,王淼,姬兰柱.生长及生物量分配的影响[J].生态学杂志,2004,23(5):93-97.

[22]刘锦春,钟章成.水分胁迫和复水对石灰岩地区柏木幼苗根系生长的影响[J].生态学报,2009,29(12):6439-6445.

[23]张晓蕾,曾凡江,刘波,等.不同土壤水分处理对疏叶骆驼刺幼苗光合特性及干物质积累的影响[J].干旱区研究,2010,27(4):649-655.

[24]魏疆,张希明,单立山,等.梭梭幼苗生长动态及其对沙漠腹地生境条件的适应策略[J].中国科学(D辑),2006,36(增刊Ⅱ):95-102.

[25]刘健,贺晓,包海龙,等.毛乌素沙地沙柳细根分布规律及与土壤水分分布的关系[J].中国沙漠,2010,30(6):1362-1366.

[26]Mokany K,Raison R J,Prokushkin A S. Critical analysis of root: shoot ratios in terrestrial biomes[J].Global Change Biology,2006,12:1284-96.

[27]周双喜,吴冬秀,张琳,等.降雨格局变化对内蒙古典型草原优势种大针茅幼苗的影响[J].植物生态学报,2010,34(10):1155-1164.

[28]Vonlanthen B,Zhang X M,Bruelheide H.On the run for water root growth of two phreatophytes in the Taklamakan Desert[J].Journal of Arid Environments,2010,74:1604-1615.

[29]杨小林,张希明,李义玲,等.塔克拉玛干沙漠腹地3种植物根系构型及其生境适应策略[J].植物生态学报,2008,32(6):1268-1276.

[30]黄刚,赵学勇,赵玉萍,等.科尔沁沙地两种典型灌木独生和混交的根系分布规律[J].中国沙漠,2007,27(2):239-243.