城乡空间差异对麻栎林土壤活性有机碳的影响

doi:10.3969/j.issn.1000-2006.201907016

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南京林业大学学报（自然科学版） ›› 2020, Vol. 44 ›› Issue (4): 151-158.doi: 10.3969/j.issn.1000-2006.201907016

城乡空间差异对麻栎林土壤活性有机碳的影响

范洪旺¹(), BUI Van Thang¹^,²(), 陶晓¹, 管致玮³, 许克福¹()

^1.安徽农业大学林学与园林学院，安徽合肥 230036
^2.越南林业大学第二分校林学系，同奈省 81000
^3.安徽农业大学轻纺工程与艺术学院，安徽合肥 230036

收稿日期:2019-07-12 修回日期:2019-11-24 出版日期:2020-07-22 发布日期:2020-08-13
通讯作者: 许克福
作者简介:范洪旺（fhw_0926@163.com）,完成实验测定及前期数据处理,论文写作|BUI Van Thang（bvthang@ahau.edu.cn）,协助实验测定、数据处理，提出论文修改意见
基金资助:
国家自然科学基金项目(31700631);安徽省自然科学基金项目(1808085MC90);安徽农业大学引进与稳定人才项目(yj2014-1)

Effects of spatial difference between urban and rural areas on soil active organic carbon in Quercus acutissima forests

FAN Hongwang¹(), BUI Van Thang¹^,²(), TAO Xiao¹, GUAN Zhiwei³, XU Kefu¹()

^1.School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei 230036, China
^2.Department of Forestry, The Second Branch of Vietnam Forestry University, Dong Nai Province 81000, Vietnam
^3.Textile Engineering and Academy of Art, Anhui Agricultural University, Hefei 230036, China

Received:2019-07-12 Revised:2019-11-24 Online:2020-07-22 Published:2020-08-13
Contact: XU Kefu

摘要/Abstract

摘要： 目的

了解城乡空间差异下森林土壤活性有机碳的动态变化和影响因素,为城市森林生态系统的碳循环研究提供数据支撑。

方法

以合肥市城乡空间差异3个森林公园为研究对象，研究城乡麻栎林0~10 cm和≥10~20 cm土层内土壤活性有机碳含量，探讨城乡空间差异对森林土壤有机碳的影响。

结果

城乡空间差异条件下，麻栎林土壤微生物量碳（MBC）和可溶性有机碳（DOC）含量差异显著（P<0.01）：中心城区土壤MBC年均值（177.26 mg/kg）显著高于城郊（97.89 mg/kg）和乡村（89.91 mg/kg）;中心城区土壤DOC年均值（139.59 mg/kg）>乡村（99.94 mg/kg）>城郊（96.42 mg/kg），不同城乡空间森林表层土壤MBC和DOC含量比≥10~20 cm土层的高。森林土壤MBC具有明显的季节变化，最高值出现在秋季（10月），而土壤DOC未发现显著季节变化。相关分析表明，土壤MBC和DOC与土壤总有机碳（TOC）、全氮（TN）呈极显著相关（P<0.001），土壤DOC与pH呈极显著负相关。

结论

不同城乡空间环境因子与土壤养分共同作用导致了土壤活性有机碳时空格局的差异。

关键词: 城乡空间, 微生物量碳（MBC）, 可溶性有机碳(DOC), 麻栎林

Abstract: Objective

Forests hold the largest carbon stocks of all terrestrial ecosystems, therefore playing a critical role in mitigating global climate change. Soil microbial biomass is often used as an early indicator of changes in soil properties, and has also been used to understand the characteristics and the factors influencing the active organic carbon in forest soils, both in urban and rural environments.

Method

In this study, we selected three forest parks in Hefei City characterized as either urban, rural or suburban, respectively.Soil samples from two upper layers (0-10 cm and ≥10-20 cm) were collected and analyzed for natural forest active organic carbon contents. The effects of urbanization on the forest soil organic carbon were analyzed in order to enhance the understanding of carbon cycles in urban forest ecosystems.

Result

The soil microbial biomass carbon (MBC) and dissolved organic carbon (DOC) contents in the central urban area were significantly different (P < 0.001) to those in the suburbs and rural areas. Furthermore, the average annual soil MBC (177.26 mg/kg) in the central urban area was significantly higher than those in the suburbs (97.89 mg/kg) and rural areas (89.91 mg/kg). The annual average DOC of soil varied in the following order: central city (139.59 mg/kg) > rural (99.94 mg/kg) > suburb (96.42 mg/kg). The MBC and DOC of the upper layer of soil in the urban and rural forests were higher than those of the lower soil layer (≥10?20 cm). The MBC of the forest soil in both urban and rural environments changed seasonally, with the highest value observed in autumn (October). However, there were no significant seasonal variations in soil DOC. The correlation analysis indicated that both soil MBC and DOC were significantly correlated with soil organic carbon and total nitrogen (P <0 .001). Furthermore, soil DOC was significantly negatively correlated with pH (P < 0.001).

Conclusion

The interaction between environmental factors (in urban, suburban, and rural forests) and soil nutrients illustrated the spatial and temporal patterns of active organic carbon in forest soils along the urban to rural gradient.

Key words: urban-rural gradient, microbial biomass carbon(MBC), dissolved organic carbon(DOC), Quercusacutissima forest

中图分类号:

S714

范洪旺,BUI Van Thang,陶晓,等. 城乡空间差异对麻栎林土壤活性有机碳的影响[J]. 南京林业大学学报（自然科学版）, 2020, 44(4): 151-158.

FAN Hongwang, BUI Van Thang, TAO Xiao, GUAN Zhiwei, XU Kefu. Effects of spatial difference between urban and rural areas on soil active organic carbon in Quercus acutissima forests[J].Journal of Nanjing Forestry University (Natural Science Edition), 2020, 44(4): 151-158.DOI: 10.3969/j.issn.1000-2006.201907016.

图/表 5

表１

图 1

表2

表3

表4

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方差来源 sources of variance	因变量 dependent variable	离差平方和 SS	自由度 df	均方 MS	F	P
月份 month	DOC	6 603	3	2 201	1.824	0.14
月份 month	MBC	119 70	3	39 723	8.371	<0.001
土层 soil layer	DOC	13 641	1	13 641	11.304	<0.001
土层 soil layer	MBC	6 745	1	6 745	1.421	0.234
月份×土层 month × soil layer	DOC	239	3	80	0.066	0.970
月份×土层 month × soil layer	MBC	1 706	3	569	0.120	0.948

采样点 sites	w(TOC)/(g·kg^-1)	w(TN)/ (g·kg^-1)	m(C)/m(N)	pH	EC/(S·m^-1)	w(SWC)/%
中心城区urban	23.42±2.20 b	1.60±0.15 a	14.66±0.37 b	4.79±0.09 a	0.10±0.03 a	28. 31±1.50 a
城郊suburban	13.18±1.55 c	1.10±0.19 b	12.25±2.16 c	4.69±0.13 ab	0.06±0.01 b	23. 29±1. 04 b
乡村rural	30.08±1.84 a	1.94±0.18 a	15.61±1.49 a	4.68±0.10 b	0.09±0.05 b	13. 04±0.70 c

指标 index	TN	TOC	C/N	pH	EC	MBC	SWC	DOC
TN	1	0.95^***	0.44^***	0.10	0.40^***	0.32^***	-0.08	0.23^***
TOC		1	0.67^***	0.01	0.30^***	0.24^***	-0.16^**	0.27^***
C/N			1	-0.16^**	-0.04	-0.03	-0.27^***	0.26^***
pH				1	0.23^***	0.23^***	0.10	-0.50^***
EC					1	0.26^***	0.28^***	0.21^***
MBC						1	0.35^***	0.18^**
SWC							1	0.26^***
DOC								1

城乡空间差异对麻栎林土壤活性有机碳的影响

Effects of spatial difference between urban and rural areas on soil active organic carbon in Quercus acutissima forests

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