|Table of Contents|

Root structure and elements (C, N, P) content characteristics of dominant shrub species in dry-hot valley *(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
2020 01
Page:
1-13
Research Field:
Articles
Publishing date:

Info

Title:
Root structure and elements (C, N, P) content characteristics of dominant shrub species in dry-hot valley *
Author(s):
LIU Ying1 2 HE Jingwen1 2 LI Songyang12 YU Hang1 2 WU Jianzhao1 2 CUI Yu1 2 LIN Yongming 1 2 ** WANG Daojie3 & LI Jian1 2
1 College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
2 Key Laboratory for Forest Ecosystem Process and Management of Fujian province, Fuzhou 350002, China
3 Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
Keywords:
dry-hot valley shrub root structure C N and P content stoichiometric ratio correlation analysis
CLC:
-
PACS:
DOI:
10.19675/j.cnki.1006-687x.2019.04040
DocumentCode:

Abstract:
Studying the root characteristics of dominant shrubs in dry-hot valleys is helpful to understand the ability to absorb nutrients and moisture of plants, the soil-fixing effect of roots and the adaptation and survival strategies for harsh environments, and provide a theoretical basis for vegetation restoration and ecological environment improvement in dry-hot valleys. In this paper, three dominant shrub species in dry-hot valley, Coriaria sinica, Dodonaea viscose and Sophora davidii, were selected to explore the morphological and structural characteristics and element contents of the roots. The research results are as follows. There were no significant differences between the root length, root surface area, dry weight and specific root length (SRL) and specific surface area (SSA) at partial diameters of C. sinica, D. viscose and S. davidii. There was a significant difference between SRL of 0-2 mm root and SRL of > 2 mm root of C. sinica. It shows that the nutrient and water absorption capacity of 0-2 mm root is better than the root of > 2mm. There were significant differences between SRL of 0-1 mm root and SRL of > 1 mm root of D. viscose and S. davidii. It shows that the nutrient and water absorption capacity of 0-1 mm root is significantly higher than the root of > 1 mm. The average C, N, and P contents of S. davidii roots were significantly higher than those of C. sinica and D. viscose. The N contents of different diameter grades were significantly higher than that of C. sinica and D. viscose. These are related to the strong nitrogen fixation of S. davidii for legumes. According to N:P, the roots of S. davidii are restricted by P, and the roots of C. sinica and D. viscose are restricted by N. The SRL and SSA of the three shrubs were not significantly correlated with the elemental contents. The reason is that the trends of SRL and SSA change with diameter level were different from the change of elemental contents. In summary, the root morphological and structural characteristics of the three shrubs in dry-hot valley were similar, but the content of C, N and P is highest in S. davidii. This result helps to understand the local plant’s utilization efficiency of soil nutrients and survival strategies.

References

-

Memo

Memo:
-
Last Update: 2019-07-05