琵琶柴和沙拐枣茎的木质部结构的差异性及空间变异特征

doi:10.13866/j.azr.2023.12.12

Abstract

Abstract:

Xylem structure traits are the basis for plant adaptation to different water conditions and are core plant traits in response to changes in environmental conditions. The typical shrubs Reaumuria soongarica and Calligonum mongolicum in the northwest desert region were selected as the subjects for comparison between stem xylem structure and functional traits to understand the differences or similarities of different species in the same habitat and the xylem structure plasticity of the same species under different environmental conditions. The results showed that (1) Xylem structure traits of R. soongarica and C. mongolicum were significantly different. The mean vessel diameter and vulnerability index of C. mongolicum were significantly higher than those of R. soongarica, whereas the opposite was true for vessel density and vessel grouping index. (2) The patterns of xylem structure traits in response to climate change differed between R. soongarica and C. mongolicum. The mean vessel diameter and vessel thickness-to-span ratio of C. mongolicum significantly reduced with increasing mean annual precipitation and aridity index, whereas that of R. soongarica were unrelated, and only the theoretical hydraulic conductivity had a significant positive correlation with the mean annual precipitation and aridity index. (3) There was a trade-off between efficiency and safety in the xylem hydraulic conductivity system of R. soongarica, whereas none was observed in C. mongolicum. (4) The trait network analysis results indicated that the central traits of both R. soongarica and C. mongolicum were mean vessel diameters. Changes in mean vessel diameter mediate changes in the trait network. Xylem structure traits between R. soongarica and C. mongolicum were significantly different, with R. soongarica having a more conservative water use strategy than C. mongolicum.

Key words: tapical shrub, Reaumuria soongarica, Calligonum mongolicum, xylem structure, plant trait networks, climatic factors, ecological adaptation strategy

SHEN Hui, ZHANG Jing, PENG Lan, TAO Ye, ZANG Yongxin, ZHANG Yuanming. Differences and spatial variation in the stem xylem structural traits of Reaumuria soongarica and Calligonum mongolicum[J].Arid Zone Research, 2023, 40(12): 1996-2006.

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行政区	样地	经度	纬度	年均温/℃	年均降水量/mm	干旱指数	琵琶柴样本量/n	沙拐枣样本量/n
阿拉善右旗，内蒙古阿拉善盟	A	100.12°E	40.13°N	8.34	98.00	0.05	5	5
阿拉善右旗，内蒙古阿拉善盟	B	103.34°E	39.73°N	8.86	93.00	0.05	5	4
额济纳旗，内蒙古阿拉善盟	C	98.15°E	42.00°N	5.84	67.00	0.04	5	4
额济纳旗，内蒙古阿拉善盟	D	99.15°E	41.91°N	7.46	54.00	0.03	7	5
额济纳旗，内蒙古阿拉善盟	E	100.44°E	41.85°N	8.62	40.00	0.02	3	4

性状	缩写	单位
导水面积百分比	CA	%
导管密度	VD	no?mm^-2
导管成分指数	S	10⁶ mm⁴
平均导管直径	D	μm
水力直径	D_h	μm
贡献95%导水率的导管直径	D₉₅	μm
导管分组指数	V_g
导管壁厚度	t	μm
导管厚跨比	(t/b)²
木材密度	WD	g?cm^-3
理论导水率	K_th	kg?m^?1?MPa^?1?s^?1
Carlquist脆弱性指数	VI	mm?m^-2

性状	琵琶柴		沙拐枣
	D_w	D	D_w	D
CA	2.01	2	2.27	2
D	2.79	3	2.51	3
V_g	0.71	0	1.47	0
WD	1.58	1	1.18	0
(t/b)²	0.85	0	0.97	0
K_th	2.58	4	2.42	2
VI	2.25	2	1.52	1
总网络	12.76	6	12.35	4

Differences and spatial variation in the stem xylem structural traits of Reaumuria soongarica and Calligonum mongolicum

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