浑善达克沙地长梗扁桃群丛特征及其驱动因素分析

doi:10.13866/j.azr.2023.05.10

Abstract

Abstract:

The stability of plant associations plays a vital role in the plant succession and safety of regional ecosystems. The biome of Amygdalus pedunculata is undergoing severe degradation because of climate change and human activities. Investigation of the characteristics of A. pedunculata associations and the factors affecting them can provide a scientific basis for restoring and managing the degradation of its biome. We conducted a study in Otindag Sandy Land to analyze the characteristics of the four typical A. pedunculata associations based on the surveyed data in 35 quadrats. Canonical correspondence analysis was used to detect the driving factors of the association distribution pattern in this region, and the relationship between species characteristics and environmental variables in each A. pedunculata association. Based on the differences in site conditions, the A. pedunculata community can be divided into four associations: Ⅰ, Amygdalus pedunculata-Allium mongolicum; Ⅱ, Amygdalus pedunculata-Stipa sareptana var. krylovii-Artemisia frigida; Ⅲ, Amygdalus pedunculata-Eragrostis pilosa; and Ⅳ, Ulmus pumila-Amygdalus pedunculata-Corispermum mongolicum. In general, temperature and elevation were the main environmental factors regulating the distribution of A. pedunculata associations with contribution rates of 13.2% and 11.4%, respectively. Soil organic matter (10-20 cm and 20-30 cm) was the determinant affecting the structure of the A. pedunculata associations. Associations I and II are influenced by elevation, growing season temperature, and 0-10 cm soil organic matter; association III is more sensitive to climatic and soil factors; and association IV is regulated by elevation.

Key words: Amygdalus pedunculata, desert ecosystems, association distribution, driving factors, soil organic matter

CHEN Jiawei, CHU Jianmin, GAN Honghao, XU Lei, GONG Shuai, LIU Hao, WANG Yingxin, YANG Hongxiao, XU Xiaoqing, QI Danhui. Asociation characteristics of Amygdalus pedunculata and the environmental factors driving them in Otindag Sandy Land[J].Arid Zone Research, 2023, 40(5): 777-784.

Figures/Tables 6

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References 37

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地理位置	编号	群丛名称	经纬度	调查样方
苏尼特右旗西部	群丛Ⅰ	长梗扁桃（Amygdalus pedunculata）-蒙古韭（Allium mongolicum）	42°34′8.8″N，112°21′25.36″E	s16~s30
苏尼特左旗北部	群丛Ⅱ	长梗扁桃-西北针茅（Stipa sareptana var. krylovii）-冷蒿（Artemisia frigida）	44°51′42.17″N，112°43′18.78″E	s1~s5
苏尼特左旗南部	群丛Ⅲ	长梗扁桃-画眉草（Eragrostis pilosa）	43°10′58.29″N，115°0′15.26″E； 42°17′57.65″N，114°50′6.73″E	s6~s15
正镶白旗东北部和正蓝旗西北部	群丛Ⅳ	榆树（Ulmus pumila）-长梗扁桃-蒙古虫实（Corispermum mongolicum）	42°55′8.2″N，115°0′46.23″E； 42°2′27.34″N，115°4′11.61″E	s30~s35

群丛	海拔/m	乔木层	灌木层			草本层
群丛	海拔/m	丰富度	丰富度	高度/m	冠幅乘积/m²	丰富度	盖度/%
群丛Ⅰ	1200±8ab	0	3.0±1.0ab	0.34±0.05b	0.40±0.10b	9.4±2.16a	47±13b
群丛Ⅱ	1173±53b	0	1.6±0.9b	0.70±0.12b	0.86±0.34b	7.6±2.19a	34±13b
群丛Ⅲ	1105±8c	0	3.8±0.4a	0.37±0.05b	0.55±0.18b	9.6±2.99a	51±13ab
群丛Ⅳ	1228±1a	1	1.8±0.8b	1.25±0.73a	3.13±2.27a	4.6±1.34b	64±11a

环境因子	第一轴	第二轴	置换检验	解释率/%	贡献率/%	显著性
A	0.4498	0.4301	2.7	7.2	11.4	0.002
Pr_6-8	0.4549	0.4980	0.8	1.9	3.0	0.640
T_6-8	-0.3516	-0.7116	1.0	2.2	3.4	0.504
T_mean	-0.7939	0.0667	3.0	8.3	13.2	0.002
U₂	-0.1495	-0.4010	0.7	1.7	2.7	0.752
Pr_mean	0.5708	0.0350	1.3	2.8	4.5	0.202
Lat	-0.2928	0.6448	1.3	2.9	4.6	0.192
Lon	0.6630	-0.1449	1.4	3.2	5.1	0.074
SOM₁	-0.1327	0.6701	1.5	3.3	5.3	0.086
SOM₂	-0.2002	0.3815	2.8	6.7	10.7	0.002
SOM₃	-0.3123	0.5450	1.0	2.3	3.7	0.438
TN₁	-0.2951	0.7151	0.9	2.1	3.4	0.540
TN₂	-0.3043	0.2483	0.8	1.9	3.0	0.650
TN₃	-0.4550	0.5396	1.1	2.5	3.9	0.344
TC₁	-0.4495	0.2850	0.8	1.9	3.0	0.686
TC₂	-0.5210	0.2310	1.5	3.6	5.7	0.056
TC₃	-0.5418	0.6945	2.7	6.7	10.6	0.002
pH	-0.1147	0.2671	0.7	2.7	2.7	0.758

Asociation characteristics of Amygdalus pedunculata and the environmental factors driving them in Otindag Sandy Land

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