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[1]赵国靖,徐伟洲,郭亚力,等.达乌里胡枝子根系形态特征对土壤水分变化的响应[J].应用与环境生物学报,2014,20(03):484-490.[doi:10.3724/SP.J.1145.2014.10012]
 ZHAO Guojing,XU Weizhou,GUO Yali,et al.Responses of root system of Lespedeza davurica L. to soil water change[J].Chinese Journal of Applied & Environmental Biology,2014,20(03):484-490.[doi:10.3724/SP.J.1145.2014.10012]
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达乌里胡枝子根系形态特征对土壤水分变化的响应()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
20卷
期数:
2014年03期
页码:
484-490
栏目:
研究论文
出版日期:
2014-06-25

文章信息/Info

Title:
Responses of root system of Lespedeza davurica L. to soil water change
作者:
赵国靖徐伟洲郭亚力吴爱姣陈吉徐炳成
1西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室 杨凌 712100 2中国科学院水利部水土保持研究所 杨凌 712100
Author(s):
ZHAO Guojing XU Weizhou GUO Yali WU Aijiao CHEN Ji XU Bingcheng
1State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, China 2Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, China
关键词:
达乌里胡枝子土壤水分总根长根表面积根系直径
Keywords:
Lespedeza davurica soil water total root length root surface area root average diameter
分类号:
Q945.17 : S154.4
DOI:
10.3724/SP.J.1145.2014.10012
文献标志码:
A
摘要:
为揭示黄土丘陵区天然草地群落优势种达乌里胡枝子(Lespedeza davurica L.)根系生长与土壤水分供应条件间的关系,采用盆栽控制试验,设置高水(土壤田间持水量80%)、中水(土壤田间持水量60%)和低水(土壤田间持水量40%)3个处理后,在现蕾期、开花期和结实期进行阶段改善水分供应条件,生育期末测定和计算了不同土壤水分处理下达乌里胡枝子根系生物量和形态特征. 结果表明:达乌里胡枝子根系生长与水分供应条件密切相关,充分的水分供应有利于促进其根系生物量增大和根系长度的生长,但适度水分胁迫有利于增强其根系的吸收能力. 其根系生物量和总根长在高水处理下显著最高(P < 0.05);根表面积、比根长和比根面积以中水处理下显著最高(P < 0.05);不同水分处理下,其根系平均直径为0.76-0.94 mm,根系生物量、根表面积和总根长间存在显著的正相关关系(P < 0.05). 综上,充足的水分供应有利于促进达乌里胡枝子根系生物量积累和根系形态建成,其根系生物量及其形态特征对水分阶段改变的响应不仅取决于水分供应条件改善的幅度,也与其生育期密切相关.
Abstract:
This study aimed to clarify the relationship between root morphological characteristics of Lespedeza davurica L. under different soil water conditions. One pot experiment was conducted to investigate the root biomass, total root length, root surface area, root average diameter, specific root length and specific root area under three soil water regimes, i.e. sufficient water supply (HW, 80% FC), moderate water stress (MW, 60% FC) and severe water stress (LW, 40% FC). Besides, at the three main growth periods (budding, flowering and grain filling stage), soil water contents were improved separately from MW to HW, LW to HW and MW, respectively. Root biomass and morphological characteristics under different soil moisture treatments at the end of growth period were measured and calculated. Results showed that root biomass and total root length were significantly higher in the HW than other regimes (P < 0.05), and root surface area, specific root length and specific root area significantly higher in the MW regime than others (P < 0.05). The root average diameter was 0.76-0.94 mm under different water regimes. Positive linear relationships existed between total root length and root biomass as well as root surface area. In summary, sufficient water supply is favorable to root biomass accumulation and morphology formation of L. davurica, and their responses to soil water change are related to the degree of water condition improvement and its growing stage.

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备注/Memo

备注/Memo:
国家自然科学基金面上项目(41371509)、教育部新世纪优秀人才支持计划(NECT-11-0444)和中央高校基本科研业务费专项资金(ZD2013020)资助 Supported by the National Natural Science Foundation of China (41371509), the Program for New Century Excellent Talents in Universities (NECT-11-0444) and the Fundamental Research Funds for the Central Universities (ZD2013020)
更新日期/Last Update: 2014-07-01