干旱区生态环境知识资源中心(Arid): 西北典型荒漠植物红砂生物量及根系形态特征对降水格局的响应

Arid

	西北典型荒漠植物红砂生物量及根系形态特征对降水格局的响应
其他题名	Response of Biomass and Root Morphology of Desert Plants Corispermum candelabrum to Precipitation Change in Northwest China
	孙百生 1; 钱金平 2; 赵欢蕊 3
来源期刊	生态环境学报
ISSN	1674-5906
出版年	2018
卷号	27 期号:11 页码:1993-1999
中文摘要	红砂(Corispermum candelabrum)是一种广泛分布于荒漠生态系统中的典型沙生植物。以红砂为研究对象,利用塑料遮雨棚,人工模拟不同降水格局(降水量不变,W;降水减少30%,W1-;降水减少60%;W2-;降水增加30%;W1+;降水增加60%,W2+),研究红砂生物量及根系形态的变化特征。结果表明,(1)红砂地上和地下生物量均表现为:降水增加>CK>降水减少,其中地上生物量差异达显著(P<0.05)。对于降水增加处理,红砂不同器官生物量大致表现为茎>叶>花;对于降水减少处理,不同器官生物量大致表现为叶>茎>花。不同降水处理下根冠比差异均不显著(P>0.05)。(2)不同土层根重和根长密度基本表现为降水增加>对照>降水减少;根重和根长密度均随着土层深度的增加而逐渐减小,在40~50 cm土层根重和根长密度较低。(3)降水对红砂根系形态特征具有显著的影响,其中降水增加(W1+、W2+)增加了根平均直径、根总长、总表面积、比根长;降水减少(W1-、W2-)降低了根平均直径、根总长、总表面积、比根长。比根长和比表面积则呈现出相反的变化趋势。(4)随着降水的增加,根系分形维数逐渐增加,其中降水增加显著增加了根系分形维数(P<0.05),降水减少显著降低了根系分形维数(P<0.05);根系丰度呈相反的变化趋势,并且红砂根系分形维数和分形丰度间均存在极显著负相关关系(P<0.01)。(5)红砂根系形态特征排序分析表明,降水增加根系形态特征主要分布在排序轴的左侧,具有较高的生物量以及较低的比根长和比表面积;而降水减少位于排序轴的右侧具有相反的特征,其形态特征与比根长和比表面积具有较强的负相关,说明红砂根系具有较强的形态可塑性。
英文摘要	Corispermum candelabrum, a typical psammophyte, is widely distributed around desert ecosystem. To investigate the response of biomass and root morphology of C. candelabrum to precipitation change, a controlled experiment was conducted with one factor: precipitation natural precipitation as control (W); precipitation plus 60% (W2+); precipitation plus 30% (W1+); precipitation minus 30% (W1-); precipitation minus 60% (W2-), during the growing season. Results showed that: (1) Aboveground biomass of C. candelabrum showed W2+>W1+>W>W1->W2-, and there were no significant differences among different treatments. Belowground biomass of Corispermum candelabrum showed W1+>W2+>W>W1->W2-. Aboveground biomass increased with the increasing of precipitation, while below-ground biomass decreased with the increasing of precipitation. As for W-, modular biomass showed leaf>stem>flower, and there was no significant differences among different treatment in root shoot ratio (P>0.05). (2) The root weight and root density gradually decreased with soil depth which showed W+>W>W-, and was the lowest in 40~50 cm of soil depth. (3) There was a significant influence on the morphological characteristics of desert plants. W+ increased the average root diameter, root length, total surface area, specific root length, while W- decreased the average root diameter, root length, total surface area, specific root length. Specific root length and specific surface area showed the opposite trend. (4) Root fractal dimension increased with the increasing of precipitation, while W- decreased the root fractal dimension, and the root system abundance showed the opposite trend. (5) Correlation analysis showed that there was a strong relationship among root morphology, which showed strong morphological plasticity, being able to adapt to environmental stress by changing root morphological characteristics.
中文关键词	荒漠植物 ; 红砂 ; 根系形态 ; 降水格局
英文关键词	desert plants Corispermum candelabrum root morphology precipitation change
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6379715
来源机构	甘肃农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238087
作者单位	1.河北民族师范学院资源与环境科学系, 承德, 河北 067000, 中国; 2.河北师范大学资源与环境科学学院;;河北师范大学, ;;环境演变与生态建设河北省重点实验室, 石家庄;;石家庄, 河北;;河北 050024;;050024, 中国; 3.甘肃农业大学农学院, 兰州, 甘肃 730070, 中国
推荐引用方式 GB/T 7714	孙百生,钱金平,赵欢蕊. 西北典型荒漠植物红砂生物量及根系形态特征对降水格局的响应[J]. 甘肃农业大学,2018,27(11):1993-1999.
APA	孙百生,钱金平,&赵欢蕊.(2018).西北典型荒漠植物红砂生物量及根系形态特征对降水格局的响应.生态环境学报,27(11),1993-1999.
MLA	孙百生,et al."西北典型荒漠植物红砂生物量及根系形态特征对降水格局的响应".生态环境学报 27.11(2018):1993-1999.