不同生境/萌发类型尖喙牻牛儿苗生物量分配特征

doi:10.13866/j.azr.2022.02.21

Abstract

Abstract:

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.

Key words: ephemeral plants, Erodium oxyrhinchum, biomass allocation, allometry, biological soil crust, summer sprout

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.

Figures/Tables 4

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Tab. 1

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参数	类型	相关生长指数				等速生长检验		共同斜率检验
参数	类型	R²	P	α	95%CI	F	P	α	P
Y=BGB,X=AGB	BS	0.825	<0.0001	0.9625a	0.819~1.1312	0.233	0.633	0.8843	0.000
	AS	0.902	<0.0001	0.8547a	0.7932~0.921	17.675	0.000
	LS	0.636	<0.0001	0.7785a	0.6176~0.9813	4.923	0.035
	SG	0.719	<0.0001	1.0211a	0.8644~1.2061	0.063	0.803
Y=TB,X=AGB	BS	0.998	<0.0001	0.9873a	0.9722~1.0026	2.902	0.100	-	-
	AS	0.998	<0.0001	0.9717ab	0.9614~0.982	29.133	0.000
	LS	0.994	<0.0001	0.9431b	0.9154~0.9716	16.245	0.000
	SG	0.993	<0.0001	0.9818a	0.9558~1.0086	1.891	0.177
Y=TB,X=BGB	BS	0.854	<0.0001	1.0257a	0.885~1.1888	0.123	0.728	1.1010	0.001
	AS	0.926	<0.0001	1.1368a	1.0653~1.2131	15.559	0.000
	LS	0.706	<0.0001	1.2114a	0.9836~1.492	3.548	0.070
	SG	0.792	<0.0001	0.9616a	0.8331~1.11	0.302	0.586

Biomass allocation patterns of an ephemeral species (Erodium oxyrhinchum) in different habitats and germination types in the Gurbantunggut Desert, China

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