间伐对杉木人工林土壤微生物残体碳的影响

doi:10.11707/j.1001-7488.LYKX20220393

Abstract

Abstract:

Objective: The differences of soil physicochemical properties, enzyme activities, microbial residue carbon and their contribution to soil organic carbon (SOC) of Cunninghamia lanceolata plantation under different thinning intensities were analyzed, and a new regulation mechanism of soil physicochemical properties and enzyme activities on microbial residue carbon accumulation was revealed. It provides a scientific theoretical basis for the sustainable management of Cunninghamia lanceolata plantations, alleviating global climate change and achieving the goal of "carbon neutrality" in my country. Method: Taking the Cunninghamia lanceolata plantation in Guanzhuang state-owned forest farm in Fujian Province as the object, the soil samples of 0-10 cm and 10-20 cm in different thinning intensities (31%, 45%, 63%) were collected, and aminosugars were used as microorganisms. Markers of residues, to explore the effects of thinning intensity and soil depth on the accumulation characteristics of soil microbial residues. Result: 1) The contents of soil bacterial microbial residue carbon (MRC_B), fungal microbial residue carbon (MRC_F), and microbial residue carbon (MRC) all increased significantly with the increase of thinning The ratio of carbon to bacterial residues (MRC_F/MRC_B) decreased with the increase of thinning intensity; soil MRC_B, MRC_F, MRC, MRC_F/MRC_B decreased with the deepening of soil layer. 2) The contribution rates of soil MRC_B, MRC_F and MRC to SOC were 13.20%-18.99%, 28.42%-39.72%, and 41.62%-58.70% under different thinning intensities, and they all increased with the deepening of the soil layer. 3) In the 0-10 and 10-20 cm soil layers, SOC, total phosphorus (TP), available phosphorus (AP), microbial biomass carbon (MBC), dissolved organic carbon (DOC), nitrate nitrogen. The contents of (NO₃^?-N) and ammonium nitrogen (NH₄⁺-N) were in the order of heavy thinning > moderate thinning > weak thinning, while pH value and density decreased with the increase of thinning intensity. 4) Both thinning intensity and soil layer depth had significant or extremely significant effects on soil enzyme activity ( P<0.05). The content of polyphenol oxidase decreased first and then increased; and with the deepening of the soil layer, the activities of the four enzymes all showed a decreasing trend. 5) Structural equation modeling (SEM) analysis showed that soil chemical properties and enzyme activities were latent variables that had a greater impact on the carbon content of soil microbial residues in the 0-10 and 10-20 cm soil layers, respectively. The soil single factor that has a greater impact on the latent variable soil microbial residue carbon content is the soluble carbon (P=0.002) and ammonium nitrogen (P=0.066) content in the 0-10 cm soil layer, and the 10-20 cm soil layer is Peroxidase (P=0.002) and nitrate (P=0.034) content. Conclusion: With the increase of thinning intensity, soil physicochemical properties and enzyme activities of Cunninghamia lanceolata plantations changed significantly, and the content of soil various forms of carbon and microbial residue carbon increased continuously; the structural equation model was well fitted, and the latent variable soil microbial residue carbon content was mainly It is regulated by the latent variables of soil chemical properties (soluble carbon, ammonium nitrogen and nitrate nitrogen) and enzyme activity (peroxidase), so in Cunninghamia lanceolata plantation management, soil nutrients and enzyme activities can be improved by moderate management density , and increase the carbon content of microbial residues and their contribution to the SOC pool.

Key words: thinning, bacteria, fungi, microbial residual carbon, structural equation model

CLC Number:

S714.2

Chaowei Cui,Lihong Peng,Dongxu Ma,Jiaqi Wang,Xiangqing Jiang,Xiangui Jiang,Xiangqing Ma,Kaimin Lin. Effects of Thinning on Soil Microbial Necromass Carbon in Cunninghamia lanceolata Plantation[J]. Scientia Silvae Sinicae, 2023, 59(5): 41-52.

Figures/Tables 7

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项目 Item	弱度间伐 Weak thinning（WT）	中度间伐 Moderate thinning（MT）	强度间伐 Heavy thinning（HT）
经纬度 Latitude and longitude	117°43′15.56″—117°43′18.37″E，26°32′61.80″—26°32′67.48″N
坡向 Aspect	阳坡 Sunny slope
坡度 Average slope/(°)	25	27	20
优势灌木(重要值) Dominant bushes (important value)	杜茎山Maesa japonica (37.68%)、紫麻Oreocnide frutescens (23.05%)	杜茎山Maesa japonica (26.77%)、粗叶榕Ficus hirta (21.06%)	杜茎山Maesa japonica (22.93%)、紫珠Callicarpa bodinieri (15.54%)
优势草本（重要值） Dominant herbs (important value)	傅氏凤尾蕨Pteris fauriei(37.01%)、华南毛蕨Cyclosorus parasiticus (12.81%)、中华薹草Carex chinensis (11.20%)	傅氏凤尾蕨Pteris fauriei (34.19%)、枸骨Ilex cornuta (10.20%)、华南毛蕨Cyclosorus parasiticus (11.62%)、中华薹草Carex chinensis (11.20%)	傅氏凤尾蕨Pteris fauriei (26.93%)、华南毛蕨Cyclosorus parasiticus (10.57%)
初植密度 Initial density/(tree·hm^?2)	3 250
间伐强度 Thinning intensity(%)	31	45	63
保留密度 Reserving density/(tree·hm^?2)	2 250	1 800	1 200
伐前胸径 DBH before thinning/cm	11.83±0.29B	11.44±0.17AB	10.98±0.33A
伐后胸径 DBH after thinning/cm	13.09±0.47B	13.47±0.47AB	13.84±0.73A
伐前树高 Tree height before thinning /m	11.32±0.14A	11.34±0.28A	11.06±0.17A
伐后树高 Tree height after thinning /m	11.89±0.18B	12.04±0.09AB	12.20±0.36A
土壤类型 Soil type	黄红壤 Yellow-red soil
母质 Parent material	岩浆岩、沉积岩Magmatic, sedimentary

土壤指标 Soil index	0~10 cm			10~20 cm			Two-way ANOVA
土壤指标 Soil index	WT	MT	HT	WT	MT	HT	T	D	T×D
SD/(g·cm^?3)	1.20±0.11Aa	1.09±0.27Aa	1.01±0.20Aa	1.23±0.11Aa	1.15±0.21Aa	1.08±0.26Aa	ns	ns	ns
SMC(%)	31.60±2.10Ba	30.73±1.96Ba	33.95±2.35Aa	30.99±2.48ABa	29.84±2.41Ba	32.99±2.74Aa	*	ns	ns
pH	4.42±0.08Aa	4.33±0.07ABa	4.29±0.12Ba	4.61±0.35Aa	4.22±0.06Bb	4.32±0.1Ba	**	ns	*
SOC/(g·kg^?1)	16.47±3.04Aa	18.04±2.14Aa	19.14±3.59Aa	11.45±2.20Ba	11.25±1.03Bb	15.17±3.59Aa	*	**	ns
TN/(g·kg^?1)	1.58±0.08Aa	1.55±0.13Aa	1.81±0.06Aa	1.37±0.04Ab	1.01±0.07Bb	1.38±0.05Ab	**	*	ns
TP/(g·kg^?1)	0.48±0.05Ba	0.56±0.03Ba	0.95±0.13Aa	0.48±0.06Ba	0.51±0.01Bb	0.81±0.14Aa	**	*	ns
AP/(mg·kg^?1)	2.98±0.08Bb	3.08±0.10Bb	3.30±0.16Aa	2.96±0.11Bb	2.92±0.07Bb	3.14±0.16Aa	**	**	ns
NO₃^?-N/(mg·kg^?1)	2.86±0.06Ca	3.58±0.14Bb	4.61±0.12Aa	3.03±0.14Ba	4.36±0.01Aa	4.50±0.11Aa	**	*	*
NH₄⁺-N/(mg·kg^?1)	11.37±0.29Ca	14.46±0.46Bb	17.40±0.64Ab	11.38±0.36Ca	17.79±0.74Ba	20.04±1.01Aa	**	*	*
MBC/(mg·kg^?1)	277.67±30.94Cb	456.56±44.32Ba	565.99±33.18Aa	332.62±40.84Ba	414.88±46.9Aa	426.97±59.6Ab	**	**	**
DOC/(mg·kg^?1)	467.32±43.72Ca	578.66±48.36Ba	772.78±51.91Aa	504.26±37.9Ca	557.93±67.34Ba	686.53±46.12Ab	**	ns	**

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Effects of Thinning on Soil Microbial Necromass Carbon in Cunninghamia lanceolata Plantation

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