干旱区生态环境知识资源中心(Arid): 半日花(Helianthemum songaricum)根系生态适应特征

Arid

	半日花(Helianthemum songaricum)根系生态适应特征
其他题名	Ecological Adaptability of Helianthemum songaricum Roots in West Ordos
	清华 1; 杨劼 1; 张璞进 1; 陈育 1; 张雷 2; 赵利清 1; 宋炳煜 1
来源期刊	干旱区研究
ISSN	1001-4675
出版年	2011
卷号	28 期号:5 页码:832-838
中文摘要	珍稀濒危灌木半日花(Helianthemum songaricum)是古老的第三纪孑遗植物，其群落是荒漠植被的主要类型之一。采用全根挖掘法研究西鄂尔多斯半日花的根系形态特征，调查群落内土壤机械组成和有效降雨后土壤水分的垂直分布格局。结果表明:半日花根系分布深度在100 cm左右，根幅为冠幅的30倍以上，根冠比为2～3;其根系生物量和根长密度主要集中在0～30 cm土层，分别占根系总量和总根长密度的94．53%和90．61%;细根(直径＜1 mm)、小根(直径为1～2 mm)、中根(直径为2～5 mm)的生物量和根长密度的垂直分布，均表现为随土壤深度加深先增加后降低的趋势，且在10～20 cm土层最高;细根的生物量和根长密度与土壤含水量具有显著的正相关性，与土壤各粒级没有显著的正相关性，但与石块含量的正相关性最高;土壤水分与土壤各粒径含量也没有显著正相关性，但与石块含量的正相关性最高。研究表明，半日花根系的形态特征是半日花长期适应干旱、砾石质生境的结果
英文摘要	Helianthemum songaricum，a rare and endangered shrub species in west Ordos，is tertiary relic plant， and its community is one of the major types of desert vegetation．The species plays the important roles in maintaining the stability of desert vegetation and researches for environmental evolution，flora，biological evolution and biodiversity．In this study，the roots of H．songaricum in west Ordos were excavated in growth season to investigate its morphological characteristics．Moreover，the soil mechanical composition and vertical distribution pattern of soil moisture content after effective rainfall in H．songaricum community were also investigated．The results show that the depth of the roots could reach down to about 100 cm，and the root range was more than 30 times larger than that of canopy;the root biomass and length density were mainly distributed in soil layers of 0-30 cm，which accounted for 94．51%and 90．61%of the total root biomass and total root length density，respectively．Vertically，the biomass and root length density of fine roots(＜1 mm in diameter)，small roots(1-2 mm in diameter)and medium roots(2-5 mm in diameter)were all increased at first and then decreased with the increase of soil depth，and the maximum values occurred all in soil layer of 10-20 cm．Fine root biomass and root length density had a significantly positive correlation with soil water content，but not with soil mechanical composition．Compared with the contents of other soil particles，stone content was more correlated with fine root biomass，root length density and soil moisture content．Our results suggested that the formation of root morphological characteristics of H．songaricum is a result of adaptation to drought and gravel habitat．
中文关键词	半日花(Helianthemum songaricum) ; 根系 ; 土壤含水量 ; 土壤机械组成 ; 生态适应性 ; 鄂尔多斯
英文关键词	Helianthemum songaricum root soil moisture content soil mechanical composition ecological adaptability Ordos
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:4307319
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/226539
作者单位	1.内蒙古大学生命科学学院, 呼和浩特, 内蒙古 010021, 中国; 2.内蒙古自治区林业科学研究院, 呼和浩特, 内蒙古 010010, 中国
推荐引用方式 GB/T 7714	清华,杨劼,张璞进,等. 半日花(Helianthemum songaricum)根系生态适应特征[J],2011,28(5):832-838.
APA	清华.,杨劼.,张璞进.,陈育.,张雷.,...&宋炳煜.(2011).半日花(Helianthemum songaricum)根系生态适应特征.干旱区研究,28(5),832-838.
MLA	清华,et al."半日花(Helianthemum songaricum)根系生态适应特征".干旱区研究 28.5(2011):832-838.