干旱区生态环境知识资源中心(Arid): Adventitious roots are key to the development of nebkhas in extremely arid regions

Arid

DOI	10.1007/s11104-019-04209-4
	Adventitious roots are key to the development of nebkhas in extremely arid regions
	Luo, Weicheng; Zhao, Wenzhi
通讯作者	Zhao, Wenzhi
来源期刊	PLANT AND SOIL
ISSN	0032-079X
EISSN	1573-5036
出版年	2019
卷号	442 期号:1-2 页码:471-482
英文摘要	Aims Nebkhas, discrete sand mounds formed with a plant, are a common landscape feature critical to the stability of desert ecosystems. However, adaptations which allow plants to thrive in nebkhas in extremely arid regions are still unclear. The objectives of this study were to test the role of adventitious roots (AR) in the growth and development of Nitraria sphaerocarpa-vegetated nebkhas. Methods We determined biomass distribution patterns and nutrient levels in small, medium, and large nebkhas representing different stages of nebkha development from young to mature, respectively. Results Our results showed that biomass allocation patterns and nutrient levels were very different among the different nebkha sizes. The proportions of leaves and stems increased with the increase in nebkha size, while those of AR and initial roots (IR) decreased. This indicated that, with an increase in nebkha size, N. sphaerocarpa allocated a higher proportion of biomass to leaves and stems mainly at the expense of roots, and that allowed plants to withstand increased burial depth. The proportion of AR, especially fine AR, varied among nebkha sizes. The proportion of AR in large nebkhas was significantly higher than in small nebkhas. For small and medium nebkhas, the proportion of fine AR was smaller than that of fine IR; for large nebkhas, the proportion of fine AR was higher. This indicated that AR, produced higher on the buried stems in the late stages of nebkha development, may provide increased access to water and nutrients to ensure nebkha survival. Nutrient levels were different in AR and IR of different nebkha growth stages. N and P contents of coarse AR and IR increased with nebkha size. For small nebkhas, N and K levels in fine AR were significantly lower than those in IR; however, for large nebkhas, N and K levels in AR were significantly higher than those in IR. This indicated that AR in the late stages of nebkha development may have stronger absorptive capacity for resources than IR. Conclusions We conclude that AR are key factor which ensured both the survival and development of N. sphaerocarpa nebkha in extremely arid environment.
英文关键词	Nebkha Adventitious root Initial root Biomass allocation Nutrient levels
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000485324700032
WOS关键词	PHYTOGENIC MOUNDS NEBKHAS ; SAND-BURIAL ; BIOMASS DISTRIBUTION ; SPECIES-DIVERSITY ; DESERT STEPPES ; PLANT-GROWTH ; WIND EROSION ; DROUGHT ; ALLOCATION ; MORPHOLOGY
WOS类目	Agronomy ; Plant Sciences ; Soil Science
WOS研究方向	Agriculture ; Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218005
作者单位	Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Ecohydrol Inland River Basin, Linze Inland River Basin Res Stn,Chinese Ecosyst, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Luo, Weicheng,Zhao, Wenzhi. Adventitious roots are key to the development of nebkhas in extremely arid regions[J],2019,442(1-2):471-482.
APA	Luo, Weicheng,&Zhao, Wenzhi.(2019).Adventitious roots are key to the development of nebkhas in extremely arid regions.PLANT AND SOIL,442(1-2),471-482.
MLA	Luo, Weicheng,et al."Adventitious roots are key to the development of nebkhas in extremely arid regions".PLANT AND SOIL 442.1-2(2019):471-482.