Biomass allocation patterns of an ephemeral species (Erodium oxyrhinchum) in different habitats and germination types in the Gurbantunggut Desert, China
Received date: 2021-08-15
Revised date: 2021-11-13
Online published: 2022-03-30
Ephemeral plants are an important plant group in desert ecosystems; they have diverse habitats, and many species also have isochronous germination characteristics. The accumulation and distribution of plant biomass can reflect its response and adaptability to the environment; therefore, studying the biomass allocation pattern of ephemeral plants under different environmental conditions is helpful to further understand the survival strategies of these plants. This study investigated Erodium oxyrhinchum samples germinated in the summer in bare sand and in the spring in three natural habitats (i.e., bare sand, algal crust, and lichen crust). The aboveground and underground biomass were obtained by the whole-plant excavation method. Differences in the plant biomass distribution and allometric growth among the four types [i.e., Bare Sand-Spring Germination (BS), Algal-Spring Germination (AS), Lichen-Spring Germination (LS), Summer Germination in Bare Sand (SG)] were systematically compared and analyzed to explore the variability and conservatism of their resource allocation strategy. The aboveground, underground, and total biomass of individual plants was highest for BS, followed by AS, then followed by LS and SG, who were equal. The root to shoot ratio (R/S) of SG was similar to that of LS and AS, all of which were higher than BS. The aboveground and underground biomass of BS and SG plants both showed an isometric relationship, whereas that of AS and LS represented allometric relationships; nonetheless, a common allometric scaling exponent (0.8843) existed in all four types. The R/S for AS and LS decreased allometrically as individual plant size increased, while the R/S for BS and SG remained relatively constant. In short, the biomass allocation of Erodium oxyrhinchum may be affected by the external environment and individual development, and showed obvious plasticity, which reflected a trade-off between the conservatism and plasticity of resource allocation.
ZHANG Yuanyuan,MENG Huanhuan,ZHOU Xiaobing,YIN Benfeng,ZHOU Duoqi,TAO Ye . Biomass allocation patterns of an ephemeral species (Erodium oxyrhinchum) in different habitats and germination types in the Gurbantunggut Desert, China[J]. Arid Zone Research, 2022 , 39(2) : 541 -550 . DOI: 10.13866/j.azr.2022.02.21
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