The litter decomposition of fallen leaves and branches from sub-alpine Quercus aquifolioides of central Yunnan Plateau under simulated nitrogen deposition

doi:10.12302/j.issn.1000-2006.202209065

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2024, Vol. 48 ›› Issue (4): 191-199.doi: 10.12302/j.issn.1000-2006.202209065

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The litter decomposition of fallen leaves and branches from sub-alpine Quercus aquifolioides of central Yunnan Plateau under simulated nitrogen deposition

XING Jinmei¹(), WANG Keqin¹^,², SONG Yali¹^,²^,^*(), FU Hongwei¹

1. School of Ecology and Environment, Southwest Forestry University, Kunming 650224, China
2. National Positioning Observation and Research Station of Yuxi Forest Ecosystem, National Forestry and Grassland Administration, Kunming 650224, China

Received:2022-09-29 Revised:2023-03-30 Online:2024-07-30 Published:2024-08-05
Contact: SONG Yali E-mail:xingjinmei1720@163.com;songyali19851205@sina.com

Abstract

Abstract:

【Objective】Increased nitrogen (N) deposition affects carbon (C) and N availability by affecting the litter decomposition process, after which it affects the C-nutrient balance of the biogeochemical cycle. In this study, the nylon mesh bag method was used to study the decomposition rate and nutrient content changes of Quercus aquifolioides litter under simulated N deposition, providing a reference for an effective Q. aquifolioides forest ecosystem management.【Method】The in situ litter decomposition test was carried out in the Q. aquifolioides forest of Mopanshan in Xinping County, central Yunnan Province. Four N levels were applied using the nylon mesh bag method, with urea (CH₄N₂O) as the N source for in situ decomposition of litter and N deposition treatment. The four N deposition levels were: control [CK, 0 g/(m²·a)], low N [LN, 10 g/(m²·a)], medium N [MN, 20 g/(m²·a)] and high N [HN, 25 g/(m²·a)]. Leaf litter and twig mass remaining, lignin, cellulose, and C, N, P and K contents were then measured.【Result】① After one year of decomposition, the N deposition treatment significantly increased the mass remaining rate (P<0.05) of leaf litter (0.84%-3.87%) and twig (1.67%-3.30%). The litter decomposition was inhibited, and the inhibition intensity was proportional to N content application. ② Variation coefficients of leaf and twig litter decomposition were 0.271-0.368 and 0.167-0.218 kg/(kg·a), respectively. The lhe C/N (69.02) and lignin/N (54.65) of twig litter were significantly higher compared with leaf litter (52.09 and 44.42, respectively). Leaf decomposition rate was faster compared with that of twig. ③ The chemical composition of the litter affected its mass remaining rate, which was negatively correlated with N and P contents of leaf and twig litters, and positively correlated with C, cellulose, C/N, C/P, lignin/N and cellulose/N.【Conclusion】The N deposition inhibits litter decomposition, and this effect is significantly enhanced by increased nutrient content. Initial nutrient content effects nutrient retention and litter release processes, among which N level, C/N and lignin/N are important influencing factors.

Key words: leaf litter, twig litter, decomposition rate, lignin, cellulose, central Yunnan Plateau, Quercus aquifolioides, N deposition

CLC Number:

S718.5

XING Jinmei, WANG Keqin, SONG Yali, FU Hongwei. The litter decomposition of fallen leaves and branches from sub-alpine Quercus aquifolioides of central Yunnan Plateau under simulated nitrogen deposition[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2024, 48(4): 191-199.

Figures/Tables 7

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References 36

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样地编号 plot No.	海拔/m altitude	林龄/a forest age	平均树高/m mean high	平均胸径/cm mean DBH	郁闭度 canopy density	坡度/ (°) slope	坡向 aspect	土壤类型 soil category
1	2 490	15	3.4	12.1	0.90	10	东北	山地黄棕壤
2	2 489	16	2.5	9.4	0.88	12	东北	山地黄棕壤
3	2 490	17	3.1	8.6	0.92	13	东北	山地黄棕壤

凋落物类型 litter type	碳含量/ (mg·g^-1) C content	氮含量/ (mg·g^-1) N content	磷含量/ (mg·g^-1) P content	钾含量/ (mg·g^-1) K content	木质素含量/ (mg·g^-1) lignin content	纤维素含量/ (mg·g^-1) cellulose content	碳氮比 C/N	碳磷比 C/P	氮磷比 N/P	木质素氮比 lignin/N	纤维素氮比 cellulose/N
凋落叶 leaf litter	517.76± 1.27	9.94± 0.01	1.07± 0.002	4.49± 0.005	441.57± 0.00	229.86± 0.00	52.09± 0.08	482.67± 0.67	9.27± 0.00	44.42± 0.06	23.12± 0.03
凋落枝 twig litter	534.24± 0.83	7.74± 0.01	0.89± 0.007	4.03± 0.01	422.97± 0.00	317.59± 0.00	69.02± 0.09	597.66± 2.19	8.66± 0.04	54.65± 0.09	41.03± 0.07

凋落物类型 litter type	处理 treatment	回归方程 regression equation	决定系数 determination coefficient	分解系数k/ (kg·kg^-1·a^-1)	分解50%时间/a T_50%	分解95%时间/a T_95%
凋落叶 leaf litter	CK	y=93.85 e^-0.368^t	0.908^**	0.368	1.884	8.141
	LN	y=94.27 e^-0.355^t	0.923^**	0.355	1.953	8.439
	MN	y=94.24 e^-0.329^t	0.964^**	0.329	2.107	9.106
	HN	y=92.95 e^-0.271^t	0.969^**	0.271	2.558	11.054
凋落枝 twig litter	CK	y=92.13 e^-0.218^t	0.943^**	0.218	3.180	13.742
	LN	y=92.04 e^-0.201^t	0.957^**	0.201	3.448	14.904
	MN	y=92.24 e^-0.192^t	0.951^**	0.192	3.610	15.603
	HN	y=91.75 e^-0.167^t	0.924^**	0.167	4.151	17.939

The litter decomposition of fallen leaves and branches from sub-alpine Quercus aquifolioides of central Yunnan Plateau under simulated nitrogen deposition

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