Soil Enzyme Activities and Stoichiometric Characteristics of Different Plant Communities under Natural Fagus Forest in Micang Mountain Nature Reserve, Sichuan

doi:10.7525/j.issn.1673-5102.2024.03.016

Abstract

Abstract:

In this study， the soil enzyme activities， stoichiometric characteristics and major environmental factors of Sarcococca ruscifolia and Fargesia spathacea communities at different depths（0<h≤10 cm， 10 cm<h≤20 cm） were examined in the natural Fagus forest in Micang Mountain Nature Reserve， Sichuan. The results showed that：（1）In different understory plant communities， the total nitrogen（TN） content in plantless community was higher than that in plant community soil. At the soil depth of 10 cm<h≤20 cm， the contents of total carbon（TC） and soil available nitrogen（SAN） were the highest in the S. ruscifolia community. （2）The soil enzyme activities （acid phosphatase（AP）， 1， 4-β-N-acetylglucosaminidase（NAG）） in the S. ruscifolia community were significantly higher than those in the no plant community and the F. spathacea community， and the activities of β-glucosidase（BG） and leucine aminopeptidase（LAP） were the highest in the F. spathacea community. The activities of polyphenol oxidase（PPO） and peroxidase （POD） in plant community were significantly higher than those in no plant community. （3）Soil enzyme activities of BG， LAP， PPO and POD were significantly positively correlated with soil pH， and soil enzyme activities（except cellobiohydrolase（CBH）） were significantly positively correlated with soil moisture content. The results of redundancy analysis（RDA） showed that soil moisture content， SAN and TC content explained 51.4%， 40.5% and 37.7% of the variation of soil enzyme activity and its stoichiometric characteristics， respectively. （4）The vector angle（VA） was greater than 45°， suggesting that soil microorganisms were more susceptible to phosphorus restriction. The results indicated that different understory plant communities could affect soil physical and chemical properties and soil enzyme activities and their stoichiometric characteristics were mainly regulated by soil moisture content， SAN and TC content.

Key words: understory vegetation, soil enzyme activity, nutrient restriction, natural forest of Fagus, Micang Mountain Nature Reserve

CLC Number:

S718.52

Lijuan LUO, Qingxiao YIN, Wei SUN, Xi ZAN, Qingmao SHI, Jing ZHANG, Yamei CHEN, Xiao XU. Soil Enzyme Activities and Stoichiometric Characteristics of Different Plant Communities under Natural Fagus Forest in Micang Mountain Nature Reserve, Sichuan[J]. Bulletin of Botanical Research, 2024, 44(3): 470-480.

Figures/Tables 7

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土壤性质 Soil property	土壤深度 Soil depth/cm	林下植物群落类型 Types of understory plant communities
土壤性质 Soil property	土壤深度 Soil depth/cm	无植物群落 No plant community	野扇花 Sarcococca ruscifolia	箭竹 Fargesia spathacea
pH	0<h≤10 cm	5.05±0.28Ab	5.56±0.11Aa	5.72±0.06Aa
pH	10 cm<h≤20 cm	5.23±0.03Ac	5.40±0.06Ab	5.67±0.02Aa
土壤含水量 SMC/%	0<h≤10 cm	40.79±0.28Ab	44.85±0.39Aa	44.83±0.19Aa
土壤含水量 SMC/%	10 cm<h≤20 cm	37.38±0.23Ba	37.54±0.93Ba	36.01±0.23Bb
全碳 TC/（g·kg^-1）	0<h≤10 cm	32.80±0.58Aa	33.22±0.51Aa	32.82±0.78Aa
全碳 TC/（g·kg^-1）	10 cm<h≤20 cm	21.14±0.22Bb	22.22±0.56Ba	19.10±0.20Bc
全氮 TN/（g·kg^-1）	0<h≤10 cm	3.40±0.07Aa	3.12±0.08Ac	3.28±0.08Ab
全氮 TN/（g·kg^-1）	10 cm<h≤20 cm	2.30±0.07Ba	2.04±0.05Bb	2.00±0.10Bb
全磷 TP/（g·kg^-1）	0<h≤10 cm	0.78±0.13Aab	0.65±0.06Ab	0.86±0.10Aa
全磷 TP/（g·kg^-1）	10 cm<h≤20 cm	0.59±0.05Aab	0.50±0.05Bb	0.62±0.09Ba
土壤碱解氮 SAN/（mg·kg^-1）	0<h≤10 cm	265.67±24.53Aa	293.57±38.68Aa	293.22±15.86Aa
土壤碱解氮 SAN/（mg·kg^-1）	10 cm<h≤20 cm	195.65±0.32Bb	223.38±15.45Ba	195.56±0.25Bb
土壤速效磷 SAP/（mg·kg^-1）	0<h≤10 cm	10.04±0.78Aa	5.93±1.00Ab	8.81±1.32Aa
土壤速效磷 SAP/（mg·kg^-1）	10 cm<h≤20 cm	6.10±3.25Ba	3.29±0.91Ba	3.09±1.48Ba
碳氮比 C∶N	0<h≤10 cm	9.65±0.12Ac	10.65±0.36Aa	9.99±0.13Ab
碳氮比 C∶N	10 cm<h≤20 cm	9.21±0.19Bc	10.87±0.18Aa	9.55±0.31Bb
碳磷比 C∶P	0<h≤10 cm	42.80±5.77Ab	51.17±5.05Aa	38.38±4.43Ab
碳磷比 C∶P	10 cm<h≤20 cm	35.97±3.75Ab	44.41±4.18Aa	31.09±4.36Bb
氮磷比 N∶P	0<h≤10 cm	4.44±0.62Aab	4.81±0.54Aa	3.83±0.41Ab
氮磷比 N∶P	10 cm<h≤20 cm	3.91±0.37Aa	4.07±0.32Ba	3.25±0.46Ab

因子 Factor	pH	SMC	TC	TN	TP	SAN	SAP	C∶N	C∶P	N∶P
BG	0.386*	0.626**	0.472**	0.456*	0.493**	0.556**	0.339	0.087	0.080	0.057
CBH	-0.307	0.118	0.200	0.226	0.036	0.122	0.264	-0.098	0.162	0.236
POD	0.583**	0.822**	0.681**	0.590**	0.526**	0.648**	0.203	0.339	0.281	0.186
PPO	0.450*	0.807**	0.641**	0.534**	0.370*	0.642**	0.149	0.430*	0.381*	0.281
LAP	0.447*	0.417*	0.245	0.250	0.308	0.249	0.259	-0.056	-0.051	-0.053
NAG	0.177	0.570**	0.485**	0.360	0.000	0.544**	0.084	0.446*	0.618**	0.535**
AP	0.201	0.916**	0.857**	0.751**	0.410*	0.833**	0.327	0.479**	0.605**	0.532**
E_C∶E_N	0.052	0.000	-0.056	-0.002	0.136	-0.038	0.048	-0.199	-0.194	-0.141
E_C∶E_P	0.270	0.400*	0.236	0.235	0.292	0.328	0.259	-0.002	0.006	0.006
E_N∶E_P	0.194	0.418*	0.315	0.233	0.055	0.378*	0.181	0.286	0.332	0.265
CQI	-0.146	-0.506**	-0.391*	-0.377*	-0.320	-0.472**	-0.330	-0.079	-0.166	-0.169
VL	0.120	0.105	0.014	0.057	0.181	0.055	0.104	-0.161	-0.152	-0.110
VA	-0.202	-0.405*	-0.303	-0.223	-0.067	-0.370*	-0.170	-0.278	-0.303	-0.233

自变量 Independent variable	解释量 Explains/%	F	P
SMC	51.4	29.6	0.002
SAN	40.5	19.1	0.002
TC	37.7	17	0.002
TN	29.4	11.7	0.002
C∶P	15.6	5.2	0.010
TP	15.3	5.0	0.012
N∶P	11.6	3.7	0.038
pH	11.6	3.7	0.038
C∶N	11.5	3.6	0.032
SAP	8.6	2.6	0.056

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