Effects of tree species on soil microbial biomass carbon and nitrogen: a case study of common garden experiment

doi:10.17521/cjpe.2021.0324

Abstract

Abstract:

Aims The aim of this study was to explore the effects of native tree species on soil microbial biomass carbon (MBC) and nitrogen (MBN) content in subtropical Sichuan.

Methods In the present study, Cinnamomum japonicum, C. longepaniculatum, C. austrosiense, Alnus cremastogyne, C. camphora, Toona ciliata and T. sinensis in a common garden were selected as the research objects; whereas the abandoned land as the control. The effects of tree species on soil MBC content and MBN at different depths (0-10, 10-20, and 20-30 cm) were analyzed using the method of common garden.

Important findings (1) Tree species significantly affected the content of soil MBC and MBN, as well as their ratio. Compared with the abandoned land, tree species exhibited positive or neutral effects and the effects of tree species were particularly obvious in C. japonicum.For example, the contents of MBC and MBN in 0-10 cm soil layer were 108.2% and 139.6% higher than those in the abandoned land, respectively. (2) The content of soil MBC and MBN in the both tree and abandoned land generally decreased with an increase with soil depth; however, the characteristics of MBC:MBN varied with tree species. (3) The content of soil MBC and MBN varied with tree species and soil layer. The variations caused by tree species were stronger than that caused by soil layer. Compared with other species, C. japonicum was more conducive to the growth and reproduction of soil microorganisms.

Key words: microbial biomass, common garden, effects of tree species, soil layer, subtropics

YUAN Chun-Yang, LI Ji-Hong, HAN Xin, HONG Zong-Wen, LIU Xuan, DU Ting, YOU Cheng-Ming, LI Han, TAN Bo, XU Zhen-Feng. Effects of tree species on soil microbial biomass carbon and nitrogen: a case study of common garden experiment[J]. Chin J Plant Ecol, 2022, 46(8): 882-889.

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https://www.plant-ecology.com/EN/Y2022/V46/I8/882

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References 39

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树种 Tree species	凋落物现存量 Litter standing crop (kg·hm^-2)	郁闭度 Canopy density	林下植物 Understory plant
香樟 Cinnamomum camphora	986.8 ± 197.0^a	0.89 ± 0.04^a	喜旱莲子草、竹叶草等 Alternanthera philoxeroides, Oplismenus compositus, etc.
大叶樟 C. austrosinense	700.9 ± 106.4^b	0.85 ± 0.03^a	构树、喜旱莲子草、茜草等 Broussonetia papyrifera, Alternanthera philoxeroides, Rubia cordifolia, etc.
油樟 C. longepaniculatum	388.9 ± 92.5^c	0.90 ± 0.25^a	喜旱莲子草、蛇莓等 Alternanthera philoxeroides, Duchesnea indica, etc.
天竺桂 C. japonicum	160.2 ± 45.9^cd	0.73 ± 0.26^a	构树、喜旱莲子草、华西凤尾蕨等 Broussonetia papyrifera, Alternanthera philoxeroides, Pteris occidentalisinica, etc.
桤木 Alnus cremastogyne	136.9 ± 40.4^cd	0.66 ± 0.53^b	构树、喜旱莲子草、茜草等 Broussonetia papyrifera, Alternanthera philoxeroides, Rubia cordifolia, etc.
红椿 Toona ciliata	17.1 ± 3.9^d	0.67 ± 0.58^b	构树、喜旱莲子草、茜草等 Broussonetia papyrifera, Alternanthera philoxeroides, Rubia cordifolia, etc.
香椿 T. sinensis	15.6 ± 2.1^d	0.67 ± 0.05^b	构树、喜旱莲子草、竹叶草等 Broussonetia papyrifera, Alternanthera philoxeroides, Oplismenus compositus, etc.

树种 Tree species	凋落物现存量 Litter standing crop (kg·hm^-2)	郁闭度 Canopy density	林下植物 Understory plant
香樟 Cinnamomum camphora	986.8 ± 197.0^a	0.89 ± 0.04^a	喜旱莲子草、竹叶草等 Alternanthera philoxeroides, Oplismenus compositus, etc.
大叶樟 C. austrosinense	700.9 ± 106.4^b	0.85 ± 0.03^a	构树、喜旱莲子草、茜草等 Broussonetia papyrifera, Alternanthera philoxeroides, Rubia cordifolia, etc.
油樟 C. longepaniculatum	388.9 ± 92.5^c	0.90 ± 0.25^a	喜旱莲子草、蛇莓等 Alternanthera philoxeroides, Duchesnea indica, etc.
天竺桂 C. japonicum	160.2 ± 45.9^cd	0.73 ± 0.26^a	构树、喜旱莲子草、华西凤尾蕨等 Broussonetia papyrifera, Alternanthera philoxeroides, Pteris occidentalisinica, etc.
桤木 Alnus cremastogyne	136.9 ± 40.4^cd	0.66 ± 0.53^b	构树、喜旱莲子草、茜草等 Broussonetia papyrifera, Alternanthera philoxeroides, Rubia cordifolia, etc.
红椿 Toona ciliata	17.1 ± 3.9^d	0.67 ± 0.58^b	构树、喜旱莲子草、茜草等 Broussonetia papyrifera, Alternanthera philoxeroides, Rubia cordifolia, etc.
香椿 T. sinensis	15.6 ± 2.1^d	0.67 ± 0.05^b	构树、喜旱莲子草、竹叶草等 Broussonetia papyrifera, Alternanthera philoxeroides, Oplismenus compositus, etc.

因子 Factor	df	MBC含量 MBC content			MBN含量 MBN content			MBC:MBN
因子 Factor	df	F	p	SS (%)	F	p	SS (%)	F	p	SS (%)
树种 Tree species (TS)	6	20.01	<0.01	52.07	10.68	<0.01	31.30	5.50	<0.01	32.12
土层 Soil layer (SL)	2	27.12	<0.01	23.52	35.78	<0.01	34.97	2.73	>0.05	5.32
树种×土层 TS × SL	12	1.19	>0.05	6.19	2.25	<0.05	13.21	1.85	>0.05	21.64

因子 Factor	df	MBC含量 MBC content			MBN含量 MBN content			MBC:MBN
因子 Factor	df	F	p	SS (%)	F	p	SS (%)	F	p	SS (%)
树种 Tree species (TS)	6	20.01	<0.01	52.07	10.68	<0.01	31.30	5.50	<0.01	32.12
土层 Soil layer (SL)	2	27.12	<0.01	23.52	35.78	<0.01	34.97	2.73	>0.05	5.32
树种×土层 TS × SL	12	1.19	>0.05	6.19	2.25	<0.05	13.21	1.85	>0.05	21.64