枯落物水浸液对华北落叶松种子萌发与幼苗生长的影响

doi:10.16843/j.sswc.2021.02.001

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Abstract [Background] Larix principis-rupprechtii is one of the main tree species in Guandi Mountain. The species is found to be poor regeneration, and the light, temperature and water conditions related to canopy density have been regarded as the main factors. However, litter is another limited factor. In this paper, the effects of litter on the seed germination and seedling growth of the species are studied. [Methods] Litters were collected from 3 types of L. principis-rupprechtii stands in Guandi Mountain, i.e. pure stand, stand mixed with Picea spp., and stand mixed with Betula spp. and Poplar spp., in 3 forms of undecomposed, semi-decomposed, and completely decomposed, respectively. Then 50 g of each litter was soaked for 2 d in 1 L distilled water to prepare the aqueous extracts of 5.0, 12.5, 25.0 and 50.0 g/L, respectively. The 20 seeds were evenly placed in each petri dish and 5mL aqueous extracts of litter were added. A two factor randomized block experiment was designed to study the effect of aqueous extracts of litter on seed germination and seedling growth of L. principis-rupprechtii. [Results] 1) To the pure L. principis-rupprechtii stand, under the treatment of extract from semi-decomposed and completely decomposed litter, the response index (I_R) of the germination percentage was from -0.45 to -0.18, and the I_R of germination index was from -0.49 to -0.27, most of them showed moderate inhibitions. In the mixed stand of L. principis-rupprechtii and Picea spp., the I_R of germination index was -0.62 under the treatment of 12.5 g/L semi-decomposed aqueous extracts, the I_R of germination percentage and germination index was -0.54 and -0.64 under the treatment of 50.0 g/L completely decomposed, respectively, which showed strong inhibition. As to the stand mixed by L. principis-rupprechtii, Betula spp. and Poplar spp., the I_R of the undecomposed litters was from -0.59 to -0.41. The I_R of germination index was from -0.51 to -0.38, the inhibition effect was beyond moderate. 2) To the pure L. principis-rupprechtii stand, the elongation of radicle, hypocotyl and cotyledon was all moderately inhibited by the extracts of semi-decomposed and completely decomposed litter. To the mixed stand of L. principis-rupprechtii and Picea spp., the growth of seedlings, especially the elongation of cotyledons, was significantly inhibited by the extract. The length of cotyledon was only (0.31±0.07) cm and the I_R value was as high as -0.70 under the treatment of 50.0 g/L completely decomposed. In the mixed stand composed of L. principis-rupprechtii, Betula spp. and Poplar spp., the aqueous extracts of undecomposed litter showed moderate and strong inhibition, and the effect was weakened with the deepening of litter decomposition. As a result, the aqueous extracts of semi-decomposed and completely decomposed litter only had weak inhibition on radicle, cotyledon and fresh weight of seedlings was weak. 3) The inhibition order of litter extracts of three stands was, pure L. principis rupprechtii stand (mean I_R=-0.12) < mixed stand of L. principis-rupprechtii and Picea spp. (mean I_R=-0.21) < mixed stand composed of L. principis-rupprechtii, Betula spp. and Poplar spp. (mean I_R=-0.27). [Conclusions] Litter has inhibition effects on the seed germination and seedling growth of L. principis-rupprechtii, and measures to decrease stand density could be taken to lessen the chemical effects of litter.

Key words： Larix principis-rupprechtii litter seed germination seedling growth

Received: 16 June 2020

PACS:

S791.229

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	LI Jin
	GAO Runmei
	SHI Xiaodong
	DANG Shangni
	ZHANG Yuqing
	LI Cong
	LI Hongyue

Cite this article:

LI Jin,GAO Runmei,SHI Xiaodong, et al. Effect on seed germination and seedling growth of Larix principis-rupprechtii from the aqueous extracts of litter[J]. SSWC, 2021, 19(2): 1-11.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2021.02.001 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2021/V19/I2/1

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