Comparative Study on Soil-Microbial Biomass Contents and Its Stoichiometry of Different Vegetation Types

doi:10.11924/j.issn.1000-6850.casb2025-1031

Abstract

Abstract:

To reveal the improvement effect of vegetation restoration on soil quality, different vegetation types in Jiufeng National Forest Park were selected as research objects, with abandoned land as the control. The contents of soil-microbe biomass carbon (C), nitrogen (N), and phosphorus (P) were determined, and the relationships among their stoichiometric ratios, microbial entropy (qMB), and stoichiometric imbalance were analyzed. The research results showed that: (1) the contents of soil C, N, and P in the natural mixed forest were significantly higher than those in other vegetation types. In addition, the C:N and C:P ratios in the Pinus tabulaeformis plantation, Platycladus orientalis plantation, and natural mixed forest were significantly higher than those in the Quercus variabilis forest and abandoned land, while the soil N:P ratio showed no significant difference. (2) The overall content of soil microbial biomass was higher in the Pinus tabulaeformis forest, Platycladus orientalis forest, and mixed forest than in the Quercus variabilis forest and abandoned land. (3) The MBC:MBN of the soil in the Pinus tabulaeformis and Platycladus orientalis plantations was significantly higher than that in the abandoned land, but there was no significant difference between the two plantations. The soil MBN:MBP did not reach a significant level, while the MBC:MBP values in the mixed forest and abandoned land were the lowest. (4) The soil microbial entropy in the Pinus tabulaeformis plantation was the largest; among which, the microbial entropy carbon (qMBC) was the lowest in the MF (12.39%). The microbial entropy nitrogen and phosphorus (qMBN, qMBP) were the lowest in the oak forest (12.30%). (5) There was no significant difference in C:N_imb among different vegetation types; the soil-microbe C:P_imb and N:P_imb were the lowest in the oak forest, and the highest in the natural mixed forest. This study found that the natural mixed forest is the optimal model for improving soil fertility. When restoring vegetation, priority should be given to constructing mixed forests of coniferous and broad-leaved trees, and rationally configuring near-natural schemes such as Pinus tabulaeformis and Platycladus orientalis. This study provides new biological evidence and precise practical support for the assessment of urban forest soil quality and the optimization of vegetation restoration strategies, and helps to achieve the connection between theoretical innovation and ecological construction needs.

Key words: plantation forest, soil nutrients, soil microbial biomass, ecological stoichiometry, microbial entropy

CLC Number:

Q938微生物生态学和地区分布

TIAN Qin, DING Xinhui, FENG Xiao, HAN Hongjiang, GOU Chenyang. Comparative Study on Soil-Microbial Biomass Contents and Its Stoichiometry of Different Vegetation Types[J]. Chinese Agricultural Science Bulletin, 2026, 42(9): 40-47.

Figures/Tables 6

References 21

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样地类型	坡向	坡度/°	郁闭度	海拔/m	树高/m
P	W	20.8	0.84	118	7.9
A	W	27.3	0.88	118	10.6
O	W	22.3	0.78	155	9.1
MF	W	30	0.85	256	5.5
B	W	25.7	—	137	—

样地类型	坡向	坡度/°	郁闭度	海拔/m	树高/m
P	W	20.8	0.84	118	7.9
A	W	27.3	0.88	118	10.6
O	W	22.3	0.78	155	9.1
MF	W	30	0.85	256	5.5
B	W	25.7	—	137	—

样地	pH	SOC/(g/kg)	TN/(g/kg)	TP/(mg/g)	C/N	C/P质量比	N/P
P	7.94±0.11c	12.01±2.64b	1.23±0.28b	0.57±0.04b	9.81±0.25a	21.42±5.88a	2.19±0.63a
A	7.26±0.375d	13.21±2.46b	1.27±0.20b	0.64±0.05b	10.38±0.98a	20.74±0.60a	2.01±0.15a
MF	6.78±0.32e	22.84±1.11a	2.21±0.04a	1.18±0.05a	10.29±0.54a	20.41±9.72a	1.98±0.92a
O	8.44±0.05b	2.70±2.04c	0.67±0.08b	0.48±0.08b	4.042±0.68c	5.62±0.49b	1.41±0.14a
B	8.70±0.22a	6.60±2.04bc	0.92±0.09b	0.65±0.47b	7.097±0.56b	10.11±2.28b	1.41±0.22a

样地	pH	SOC/(g/kg)	TN/(g/kg)	TP/(mg/g)	C/N	C/P质量比	N/P
P	7.94±0.11c	12.01±2.64b	1.23±0.28b	0.57±0.04b	9.81±0.25a	21.42±5.88a	2.19±0.63a
A	7.26±0.375d	13.21±2.46b	1.27±0.20b	0.64±0.05b	10.38±0.98a	20.74±0.60a	2.01±0.15a
MF	6.78±0.32e	22.84±1.11a	2.21±0.04a	1.18±0.05a	10.29±0.54a	20.41±9.72a	1.98±0.92a
O	8.44±0.05b	2.70±2.04c	0.67±0.08b	0.48±0.08b	4.042±0.68c	5.62±0.49b	1.41±0.14a
B	8.70±0.22a	6.60±2.04bc	0.92±0.09b	0.65±0.47b	7.097±0.56b	10.11±2.28b	1.41±0.22a

	TN	TP	MBC	MBN	MBP	C:N	C:P	N:P	MBC:N	MBC:P	MBN:P
SOC	0.981^**	0.652^**	0.681^**	0.824^**	0.843^**	0.760^**	0.838^**	0.693^**	-0.12	-0.2	-0.448
TN		0.633^*	0.556^*	0.745^**	0.774^**	0.634^*	0.783^**	0.702^**	-0.186	-0.273	-0.447
TP			0.308	0.670^**	0.706^**	0.520^*	0.231	-0.026	-0.385	-0.462	-0.401
MBC				0.734^**	0.706^**	0.890^**	0.856^**	0.646^**	0.387	0.332	-0.349
MBN					0.983^**	0.833^**	0.717^**	0.466	-0.285	-0.356	-0.402
MBP						0.802^**	0.697^**	0.459	-0.272	-0.381	-0.533^*
C:N							0.816^**	0.51	0.105	0.048	-0.363
C:P								0.910^**	0.187	0.127	-0.349
N:P									0.208	0.148	-0.295
MBC:N										0.958^**	-0.135
MBC:P											0.14