Spatial Distribution Characteristics of Soil Organic Carbon in Quercus variabilis Plantation and Its Influencing Factors

doi:10.13466/j.cnki.lyzygl.2023.04.010

Abstract

Abstract:

Forest soils play an important role in the global carbon cycle,and research on the spatial distribution of soil organic carbon and its influencing factors in plantation forests can help to understand the dynamic changes of soil carbon sink in plantation forests.Taking Quercus variabilis plantation in Dengfeng Forest farm,Henan Province as the research object,186 sample squares(10 m×10 m)were set in the forest by systematic sampling method,and the spatial distribution characteristics of soil organic carbon were analyzed by geostatistical methods,and the main factors influencing soil organic carbon were identified by constructing and using structural equation models.The results showed that the average soil organic carbon content of Quercus variabilis plantation was 18.59 g/kg,and its spatial distribution was patchy,with a more dispersed distribution of high and low value areas;while the average soil organic carbon density was 2.47 kg/m²,and its spatial distribution characteristics showed a high consistency with the soil organic carbon content,but the overall distribution was more uniform;the results of correlation analysis showed that soil organic carbon content and density were significantly and positively correlated(P<0.05)with stand factors such as diameter at breast height and tree height,and with soil factors such as total soil nitrogen and soil available phosphorus;the results of structural equation showed that both soil organic carbon content and soil organic carbon density were most influenced by soil chemical properties,with the highest contribution of total soil nitrogen.This study can provide some references for revealing the mechanism of soil carbon sink formation in artificial forests and developing technical measures for soil carbon sink regulation.

Key words: Quercus variabilis plantation, soil organic carbon, spatial distribution, structural equation model

CLC Number:

LI Siying, GUO Haotian, CHEN Xiaowei, ZHOU Mengli, JIN Shanshan, YAN Dongfeng. Spatial Distribution Characteristics of Soil Organic Carbon in Quercus variabilis Plantation and Its Influencing Factors[J]. FOREST RESOURCES WANAGEMENT, 2023, (4): 80-89.

Figures/Tables 8

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变量	均值±标准差	最小值	最大值	变异系数/%
海拔/m	623±47.00	518	755	7.54
坡度/(°)	9±10.39	1	46	113.04
郁闭度	0.5±0.11	0.2	0.7	19.81
林龄/a	32±6.46	15	50	20.25
林分密度/(株/hm²)	1 430±275.95	600	2 600	19.30
平均胸径/cm	11.7±2.51	6.4	18.62	21.53
平均树高/m	8.1±2.35	4	15	29.02

因子	平均值±标准差	最小值	最大值	变异系数/%	偏度	峰度
SOC/(g/kg)	18.59±8.19	6.89	78.86	44.05	2.84	16.19
SOCD/(kg/m²)	2.47±1.17	1.09	12.15	47.48	24.96	3.65
STN/(g/kg)	2.15±0.96	0.82	9.34	44.69	24.30	17.52
SAN/(mg/kg)	56.22±51.44	11.78	460.83	90.97	4.46	27.57
SAP/(mg//kg)	1.11±0.11	0.92	1.64	9.70	1.26	3.07
SAK/(mg/kg)	123.33±59.42	50.17	466.57	48.18	2.20	6.78
SWC/%	11.3±2.90	4.90	17.40	25.64	0.01	-0.61
BD/(g/cm³)	1.34±0.17	0.83	1.81	13.06	0.35	0.18
Sa/a	32±6.46	15.00	50.00	20.25	-0.10	-0.23
D/cm	11.66±2.51	6.40	18.62	21.53	0.34	-0.21
H/m	8.11±2.35	4.00	15.00	29.02	0.39	-0.35
SD/(株/hm²)	1 430±275.95	600.00	2 600.00	19.30	0.46	2.98
TDR/%	4.21±1.73	1.14	14.82	41.14	1.74	7.68
TDF/%	4.46±1.53	1.41	15.35	34.21	2.40	13.89
TT/%	8.67±3.11	3.02	30.18	35.85	2.25	12.29

指标	SOC	SOCD	STN	SAN	SAP	SAK	SWC	BD	Sa	D	H	SD	TDR	TDF
SOCD	0.932^**
STN	0.936^**	0.842^**
SAN	0.556^**	0.485^**	0.616^**
SAP	0.226^**	0.144^*	0.283^**	0.199^**
SAK	0.358^**	0.320^**	0.351^**	0.291^**	0.088
SWC	0.216^**	0.048	0.286^**	0.335^**	0.133	0.129
BD	-0.164^*	0.154^*	-0.239^**	-0.265^**	-0.178^*	-0.131	-0.545^**
Sa	0.307^**	0.231^**	0.312^**	0.340^**	0.125	0.111	0.269^**	-0.226^**
D	0.325^**	0.269^**	0.308^**	0.327^**	0.098	0.241^**	0.198^**	-0.158^*	0.695^**
H	0.339^**	0.264^**	0.333^**	0.332^**	0.125	0.254^**	0.219^**	-0.202^**	0.766^**	0.698^**
SD	-0.016	-0.001	0.022	0.020	-0.011	-0.039	0.079	0.054	0.123	0.099	0.060
TDR	-0.055	-0.07	-0.064	-0.066	-0.006	-0.237^**	0.044	-0.108	-0.097	-0.091	-0.151^*	-0.079
TDF	-0.121	-0.115	-0.133	-0.092	-0.01	-0.261^**	-0.052	-0.017	-0.14	-0.092	-0.169^*	-0.113	0.732^**
TT	-0.085	-0.093	-0.095	-0.068	-0.011	-0.251^**	0.012	-0.087	-0.133	-0.104	-0.174^*	-0.102	0.945^**	0.905^**

影响因子	SOC	SOCD
STN	0.97^**	0.94^**
SAK	0.37^**	0.37^**
SAP	0.21^*	0.19^*
SWC	-0.07^**
BD	0.05^**	0.34^**