川西亚高山3种天然次生林土壤有机碳氮组分特征

doi:10.11707/j.1001-7488.20201101

Abstract

Abstract:

Objective: This study is aimed to through characterization of the changes of contents of active soil organic carbon and nitrogen, and their influential factors in three secondary natural forests with similar microclimate and soil parent materials, to deepen the understanding of the changes of soil organic carbon and nitrogen stock and contents of active components during the course of regeneration of the natural secondary forest. Method: The study site is located in Jiabigou forest zone of Miyaluo town in western Sichuan, where secondary forest was formed through natural regeneration after logging in the 1960s. Soil samples in the top soil layer (0-20 cm) from Acer spp.+Betula spp. deciduous broadleaf forest (ABB), a Betula spp.+Acer spp.+Abies faxoniana mixed broadleaf-conifer forest (BAA) and a Abies faxoniana pure forest (AFF) were collected in late July, 2018. We investigated the changes of contents of soil organic carbon (SOC), total nitrogen (TN), light fraction organic carbon (LFOC), dissolved organic carbon (DOC), dissolved organic nitrogen (DON), dissolved total nitrogen (DTN), dissolved inorganic nitrogen (WDON) microbial biomass carbon (MBC) and microbial biomass nitrogen (MBN), and their relations with physical and chemical soil properties, and species diversity using the method of comparisons of adjacent plots. Correlation analysis was used to reveal the differences of soil active organic carbon and nitrogen fractions. Redundancy analysis (RDA) was determined to decipher the main factors influencing soil organic carbon and nitrogen fractions. Result: The results showed that, due to similar tree species in the ABB and BAA, the contents of SOC, LFOC, DON, and DTN ranked in the order of ABB > BAA > AFF. The contents of SOC, LFOC, MBC, DON, and DTN of AFF compared with ABB and BAA was 46.24% and 41.29%, 51.29% and 31.72%, 46.46% and 41.58%, 54.48% and 28.54%, 56.15% and 48.64% lower, respectively. The content of DOC was in the order of ABB > AFF > BAA. DOC content of AFF compared with ABB and BAA was 25.39% lower and 4.08% higher, respectively. The contents of TN, WDON, and MBN were in the order of BAA>ABB>AFF. The contents of TN and WDON of AFF compared with ABB and BAA was 48.46% and 48.59%, 63.57% and 79.94% lower, respectively. MBN content of AFF was 5.72% lower compared with ABB and 5.26% higher compared with BAA, respectively. Redundancy analysis(RDA) indicated that TN, soil total phosphorus(TP) and Shannon-Wiener index of arbor and herb layers were the major impacting factors for driving changes of soil active organic fraction contents. TN and NO₃^--N played an important role in driving changes of soil active nitrogen fractions contents. Conclusion: The results indicated that the differences of exogenous nitrogen and phosphorus (especially nitrogen) devotion were responsible for the significant differences of soil active carbon and nitrogen fractions, and the growth rhythm of tree and herbaceous plants, the availability of soil nutrient. The contents of topsoil organic carbon and nitrogen fractions in ABB and BAA were obviously higher than those in AFF. The results implied that AFF were not beneficial to the soil nutrient accumulation in the early stages (≤60 a) of natural regeneration after logging. It was therefore better to increase appropriately the proportion of broad-leaf and herbaceous species in managing A. faxoniana forests for improving soil fertility quality.

Key words: natural secondary forest, soil organic carbon, soil active organic carbon nitrogen fractions, species diversity, sub-alpine of western Sichuan

CLC Number:

S718.5

Zongda Hu,Shirong Liu,Xingliang Liu,Mingxia Luo,Jing Hu,Yafei Li,Hao Yu,Dinghua Ou,Deyong Wu. Characterization of Soil Organic Carbon and Nitrogen Components in Three Natural Secondary Forests in Subalpine Regions of Western Sichuan, China[J]. Scientia Silvae Sinicae, 2020, 56(11): 1-11.

Figures/Tables 8

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林分类型 Forest type	地理坐标 Geographic coordinates		坡位 Slope position	林分密度 Stand density/ hm^-2	优势树种占比 Ratio of dominant species(%)	平均胸径 Mean DBH/cm	平均树高 Mean height/m
林分类型 Forest type	经度Longitude(E)	纬度Latitude(N)	坡位 Slope position	林分密度 Stand density/ hm^-2	优势树种占比 Ratio of dominant species(%)	平均胸径 Mean DBH/cm	平均树高 Mean height/m
ABB	102°50′24.01″	31°37′24.24″	下坡位 Lower	2 273	AD(33) : BA(20) : BU(21) : SR(10)	12.09±3.37	6.12±1.07
BAA	102°50′24.02″	31°37′17.44″	中上坡位 Middle-upper	1 871	BA(26) : AD(31) : SR(17) : AF(11)	17.48±8.02	7.01±3.23
AFF	102°50′21.84″	31°37′17.04″	上坡位 Upper	1 075	AF(84)	16.23±7.15	9.05±2.31

林分类型 Forest type	pH	密度 Soil density/ (g·cm^-3)	土壤含水率 Soil water content (%)	硝态氮 Nitrate nitrogen (NO₃^--N)/ (mg·kg^-1)	铵态氮 Ammonium nitrogen (NH₄⁺-N)/ (mg·kg^-1)	碱解氮 Alkali hydrolysable nitrogen (AN)/ (mg·kg^-1)	总磷 Total phosphorus (TP)/ (g·kg^-1)	有效磷 Available phosphorus (AP)/ (mg·kg^-1)	全钾 Total kalium (TK)/ (g·kg^-1)	速效钾 Available kalium (AK)/ (mg·kg^-1)
ABB	5.60±0.12a	0.83±0.08a	0.51±0.04ab	9.61±1.96a	36.29±2.83a	282.78±20.87a	0.74±0.03a	20.76±2.55a	8.97±0.33a	219.65±20.58a
BAA	5.34±0.09a	0.78±0.05a	0.59±0.03a	22.82±3.46b	28.58±3.04ab	284.29±10.94a	0.71±0.03a	27.45±2.18a	8.45±0.22ab	205.69±23.71a
AFF	5.18±0.16a	0.91±0.10a	0.41±0.05b	4.01±0.74a	18.63±3.82b	179.06±10.87b	0.45±0.05b	22.38±2.16a	7.70±0.12b	98.30±15.90b

林分类型 Forest type	土壤有机碳 Soil organic carbon (SOC) / (g·kg^-1)	可溶性有机碳 Dissolved organic carbon (DOC)/ (mg·kg^-1)	轻组有机碳 Light fraction organic carbon(LFOC)/ (mg·kg^-1)	微生物生物量碳 Microbial biomass carbon (MBC)/ (mg·kg^-1)	DOC+MBC/ (mg·kg^-1)
ABB	96.36±10.29a	261.51±32.16a	17.06±1.88a	1 131.24±96.40a	1 392.75±106.22a
BAA	88.23±4.44a	187.47±14.38b	12.17±1.42b	1 036.74±39.59a	1 224.21±49.22a
AFF	51.80±6.33b	195.11±26.10b	8.31±0.29b	605.62±69.35b	800.74±56.02b

林分类型 Forest type	土壤总氮 Soil total nitrogen (TN) / (g·kg^-1)	可溶性有机氮 Dissolved organic nitrogen (DON)/ (mg·kg^-1)	可溶性无机氮 Dissolved inorganic nitrogen (WDON)/ (mg·kg^-1)	可溶性总氮 Dissolved total nitrogen (DTN)/ (mg·kg^-1)	微生物生物量氮 Microbial biomass nitrogen (MBN) / (mg·kg^-1)	DON+MBN/ (mg·kg^-1)
ABB	7.78±0.72a	47.25±5.97a	10.65±1.75a	57.90±6.04a	32.88±3.29a	80.12±6.35a
BAA	7.80±0.48a	30.10±4.20b	19.34±2.86b	49.44±4.15a	36.69±3.37a	66.79±4.05a
AFF	4.01±0.79b	21.51±5.15b	3.88±0.93c	25.39±6.05b	34.76±2.01a	56.27±6.25a

项目Item	DOC	LFOC	MBC	TN	DON	WDON	MBN	DOC+MBC	DON+MBN
SOC	0.721^**	0.859^**	0.685^**	0.938^**	0.272	0.400^*	0.347	0.807^**	0.469^*
DOC	1.000	0.684^**	0.271	0.536^**	0.323	0.014	0.104	0.516^**	0.385^*
LFOC		1.000	0.666^**	0.737^**	0.351	0.047	0.144	0.781^**	0.435^*
MBC			1.000	0.779^**	0.040	0.499^**	0.583^**	0.964^**	0.369
TN				1.000	0.168	0.567^**	0.477^*	0.841^**	0.438^*
DON					1.000	-0.229	-0.295	0.124	0.842^**
WDON						1.000	0.583^**	0.448^*	0.098
MBN							1.000	0.547^**	0.266
DOC+MBC								1.000	0.434^*
DON+MBN									1.000

Characterization of Soil Organic Carbon and Nitrogen Components in Three Natural Secondary Forests in Subalpine Regions of Western Sichuan, China

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林层 Forest layer	指标 Index	SOC	TN	DOC	LFOC	MBC	DON	WDON
乔木层 Arbor layer	丰富度指数 Margalef index	0.38	0.502^**	0.061	0.209	0.519^**	-0.047	0.502^**
	Shannon-Wiener指数 Shannon-Wiener index	0.399^*	0.494^**	0.078	0.179	0.467^*	0.106	0.517^**
	Simpson指数 Simpson index	0.38	0.470^*	0.064	0.166	0.426^*	0.167	0.476^*
	均匀度指数 Pielou index	0.183	0.29	-0.039	-0.067	0.259	0.066	0.429^*
草本层 Herb layer	丰富度指数 Margalef index	-0.262	-0.208	-0.404^*	-0.083	0.21	0.067	-0.042
	Shannon-Wiener指数 Shannon-Wiener index	-0.265	-0.211	-0.404^*	-0.076	0.222	0.066	-0.043
	Simpson指数 Simpson index	-0.185	-0.14	-0.342	-0.025	0.221	0.027	0.026
	均匀度指数 Pielou index	0.089	0.123	-0.053	0.057	0.156	0.046	0.235

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