Mechanism of herbaceous community assembly in a burned area of Picea asperata-Abies fargesii forest on the northeastern margin of the Qinghai-Tibetan Plateau

doi:10.11686/cyxb2022442

Abstract

Abstract:

Many competing theories exist with respect to the mechanisms behind plant community assembly. Niche theory and neutral theory are among the two most widely proposed mechanisms. In this study， we focused on herbaceous communities at different successional stages in a burned area of Picea asperata-Abies fargesii forest on the northeastern margin of Qinghai-Tibetan Plateau. We aimed to elucidate the mechanism of community assembly through calculation of dispersal-niche continuum index （DNCI） and modified stochasticity ratio （MST）. Results show that， 1） DNCI between communities of 5， 15， 23 years and Climax were -22.6169， -21.7507 and -8.2594， respectively. These values were all significantly less than 0， and indicate that the main driving effect of herbaceous community assembly at different succession stages was the dispersal process； 2） MST values of both the 5 yr-Climax group and the 23 yr-Climax group were above the 50%， which indicated that the stochastic process dominated the community assembly in both groups. For the 15 yr-Climax group， the MST value of 15 yr was 0.6664， and the MST value of Climax vegetation was 0.4927， indicating that the plant community assembly of 15 yr is dominated by stochasticity， while the assembly of Climax community is deterministic； since the MST value of 15 yr is much higher than 50%， and the MST value of Climax is close to the threshold of 50%， it can also be shown that the community assembly of the 15 yr-Climax group is still dominated by stochasticity. In conclusion， in a burned area of P. asperata-A. fargesii forest on the northeastern margin of the Qinghai-Tibetan Plateau， stochasticity dispersal dominated the herbaceous community assembly.

Key words: herbaceous plant, community assembly, Picea asperata-Abies fargesii forest, burned area, northeastern margin of Qinghai-Tibetan Plateau

Xin-yi YANG, Fu-qiang YANG, Xu-jiao ZHOU, Ming-jun WANG, Hai-xia HUANG, Song-song LU, Xiao-wei ZHANG, Wei-bo DU, Xu-hu WANG, Qing TIAN, An ZHAO, Wan-peng HE, Xiao-lei ZHOU. Mechanism of herbaceous community assembly in a burned area of Picea asperata-Abies fargesii forest on the northeastern margin of the Qinghai-Tibetan Plateau[J]. Acta Prataculturae Sinica, 2023, 32(8): 40-47.

Figures/Tables 4

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标识ID	组分1 Group 1	组分2 Group 2	扩散-生态位连续体指数DNCI	DNCI的置信区间CI.DNCI	DNCI的标准差S.DNCI
5 a-Climax	5 a	Climax	-22.6169	2.2968	1.1484
15 a-Climax	15 a	Climax	-21.7507	1.3716	0.6858
23 a-Climax	23 a	Climax	-8.2594	0.9296	0.4648

标识ID	组分1 Group 1	组分2 Group 2	扩散-生态位连续体指数DNCI	DNCI的置信区间CI.DNCI	DNCI的标准差S.DNCI
5 a-Climax	5 a	Climax	-22.6169	2.2968	1.1484
15 a-Climax	15 a	Climax	-21.7507	1.3716	0.6858
23 a-Climax	23 a	Climax	-8.2594	0.9296	0.4648

标识 ID	分组 Group	随机性平均强度 ST.i.ruzicka	标准化随机率 MST.i.ruzicka
5 a-Climax	5 a	0.7921	0.9165
5 a-Climax	Climax	0.8861	1.0000
15 a-Climax	15 a	0.7873	0.9026
15 a-Climax	Climax	0.8169	0.6460
23 a-Climax	23 a	0.6270	0.5558
23 a-Climax	Climax	0.8300	0.9070

标识 ID	分组 Group	随机性平均强度 ST.i.ruzicka	标准化随机率 MST.i.ruzicka
5 a-Climax	5 a	0.7921	0.9165
5 a-Climax	Climax	0.8861	1.0000
15 a-Climax	15 a	0.7873	0.9026
15 a-Climax	Climax	0.8169	0.6460
23 a-Climax	23 a	0.6270	0.5558
23 a-Climax	Climax	0.8300	0.9070

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