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Characteristics of absorptive roots of subalpine Populus purdomii and Abies fabri in Southwest China *(PDF)

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

2019 05
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Characteristics of absorptive roots of subalpine Populus purdomii and Abies fabri in Southwest China *
ZHAO Xiao-xiang1 2 WANG Gen-xu1 YANG Kai1 2 YANG Yang1 RAN Fei1 Duan Bao-li1 Lei Yan-bao1 & YANG Yan 1**
1Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
2University of Chinese Academy of Sciences, Beijing 100049, China
absorptive root morphological traits broad-leaved deciduous tree conifer tree soil nutrients

The absorptive root is an important part of the plants to extract nutrients from the soil. Rapid turnover of absorptive root functions in the carbon and nutrients cycles as reflection of morphological characteristics. Such characters results in similarities and differences of plant roots by utilization of underground resources. In this study, Populus purdomii (dominant species of broad-leaved forest as non-climax community) and Abies fabri (dominant species of coniferous forest as climax community) in the retreat terrain of the Hailuogou Glacier are selected as target species for root samples. All the roots were sampled using soil auger in the field. Morphological characteristics of absorptive roots from both species, soil temperature, soil moisture and soil nutrients under both succession stages were all measured. The results showed that: (1) there were no significant differences in soil temperature and moisture between two types of forest soil, but soil total nitrogen, available nitrogen, available phosphorus, ammonium nitrogen and nitrate nitrogen at A. fabri communitywere significantly higher than those at P. purdomii, community, (2) Total root length, root length density, specific root length and specific root surface area in A. fabri were all significantly lower than that at P. purdomii, but average root diameter, total root volume and biomass density were significantly higher than that of P. purdomii. (3) Positive correlation between some morphological characteristics in both species and soil nutrients were detected by redundancy analysis. Particularly, soil available nitrogen and total phosphorus in P. purdomii community positively related with root length density, root specific surface area, respectively. Soil available nitrogen positively related with average root diameter in A. fabri forest. The present results suggested that different of root morphological characteristics between both forest types mainly attributed to the distinction of soil nitrogen and available phosphorus.




Last Update: 2019-03-13