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- Title
Biomass partitioning pattern of Rheum tanguticum on the Qinghai–Tibet Plateau was affected by water-related factors.
- Authors
Xiong, Feng; Nie, Xiuqing; Yang, Lucun; Wang, Lingling; Li, Jingjing; Zhou, Guoying
- Abstract
To identify the patterns of aboveground biomass (MA) and belowground biomass (MB) partitioning of a tall perennial herbal plant, Rheum tanguticum Maxim. ex Balf. (R. tanguticum), we determined MA, MB, total biomass (MT), and below- to aboveground biomass ratio (MB/MA) through three consecutive sampling campaigns during 2016–2018 on the Qinghai-Tibetan plateau. We then documented MA, MB, MT, and MB/MA, and their log–log relationship with environmental factors using data from 47 sites. MB/MA showed a significant negative relationship with mean annual precipitation (MAP) and altitude but a positive relationship with mean annual temperature (MAT), soil total nitrogen content (TN), and soil humidity (SH). While MT increased with altitude and decreased with MAT, TN, and SH, but the relationship between MAP and MT was not significant. Reduced major axis analysis revealed a slope of the log–log relationship between MA and MB to be 1.16, supporting an allometric partitioning pattern of R. tanguticum. Furthermore, the scaling exponent revealed different changes to different environmental factors. Specifically, scaling exponent was sensitive to the gradient of MAP and SH, but not to the gradient of altitude, MAT, or TN. This indicated that the scaling exponent was affected by water availability.
- Subjects
QINGHAI Sheng (China); NITROGEN in soils; BIOMASS; WATER supply; ALTITUDES; MOUNTAIN soils
- Publication
Plant Ecology, 2021, Vol 222, Issue 4, p499
- ISSN
1385-0237
- Publication type
Article
- DOI
10.1007/s11258-021-01122-8