塔里木河中游不同林龄胡杨活立木空心树特征

doi:10.13866/j.azr.2023.02.09

Abstract

Abstract:

Populus euphratica Oliv. is an indicator species of eco-environmental changes in arid areas and it plays an irreplaceable role in maintaining the stability of a regional fragile ecosystem. At present, relevant research on the hollow tree of P. euphratica is still lacking. In this paper, we investigated the hollow ratio, architecture trait differences in living trees with hollow and without hollow, and its variation among the different aged forests in the Tarim River National Positioning Observation Station of P. euphratica Forest Ecosystem. The results showed that the hollow ratio of P. euphratica living standing trees in the study area was 17% (about 78 trees·hm^-2) and the hollow rate increased with the increasing forest age. The hollow rate was related to maturity as the hollow occurrence rate of mature trees was 4.3 times higher than that of immature trees. The degree of hollowing of living trees was significantly positively correlated with the diameter at breast height, tree height, crown width, and ulcer area (P < 0.05), while it negatively correlated with height-to-diameter ratio. No significant correlation of the degree of hollowing was observed with the crown loss and crown length. The hollow phenomenon did not cause an obvious disadvantage in tree growth. The architectural traits of the living standing trees of P. euphratica showed resource-conserving adaptation characteristics with the increase in standing age. and their hollowing was likely to be the adaptation strategy of P. euphratica to the extremely arid environment.

Key words: Tarim River, different stand ages, Populus euphratica, hollow tree, architecture traits

CHENG Qian, Tayierjiang AISHAN, Umut HALIK, WANG Xinying. Hollow tree characteristics of different aged Populus euphratica forests in the middle reaches of the Tarim River[J].Arid Zone Research, 2023, 40(2): 247-256.

Figures/Tables 6

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References 32

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林分特征		龄组
林分特征		中龄林	近熟林	成熟林	过熟林	总计
调查株数	总数	79	64	45	42	230
	空心树	5	5	7	22	39
	溃疡树	37	35	34	38	144
	占比/%	6.33	7.84	15.56	52.38	16.96
	溃疡占比/%	46.83	54.69	75.56	90.48	62.61
胸径/cm	M±SD	15.63±6.59c	22.19±10.56b	32.91±9.26a	36.83±23.49a	26.89±12.48
胸径/cm	最大值	39	44	58	99	99
树高/m	M±SD	8.22±2.63b	8.95±2.94b	11.50±2.88b	9.06±2.79a	26.89±2.81
树高/m	最大值	13	18	19	17.5	19
冠幅/m	M±SD	2.20±0.84c	3.36±1.81b	5.17±2.14a	4.75±1.74a	3.87±1.63
冠幅/m	最大值	5.75	10.50	11.70	9.45	11.70
林分密度/（株·hm^-2）		712±14	382±18	152±15	48±5	339.25±13

Hollow tree characteristics of different aged Populus euphratica forests in the middle reaches of the Tarim River

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