天山北坡城市群非渗透面下的土壤有机碳特征

doi:10.18306/dlkxjz.2015.06.013

Abstract

Abstract:

Existence of impervious surface areas (ISA) in cities strongly influences the physical and chemical characteristics of regional soil, therefore, has profound impact on ecosystem carbon cycle at multiple scales. However, due to the inaccessibility of soil sample beneath urban ISA, we know little about the biochemical properties and distribution pattern as well as the importance of soil organic carbon under urban ISA (SOC_ISA). To clarify this issue, 100-cm-depth soil profiles from 27 paired ISA and pervious surface areas (PSA) sites in northern Tianshan urban cluster in a dryland environment of northwestern China were taken. In order to estimate total soil carbon storage, urban land cover was retrieved from cloud-free Landsat8 images. Based on the data of land cover area and SOC, the soil carbon storage of this urban cluster was calculated. (1) averaged 100-cm-depth SOC_ISA of the northern Tianshan urban cluster is 5.74±0.39 kgC·m^-2, which is significantly lower than the paired soil organic carbon of PSA (SOC_PSA) of 8.69±0.75 kgC·m^-2, about 52% of the latter (p<0.01); averaged soil bulk density (BD) under ISA BD_ISA=1.58±0.02 g·cm^-3, which is significantly higher than its paired BD of PSA of 1.51±0.02 g·cm^-3, about 5% of the latter (p<0.01). (2) SOC and BD of both ISA and PSA declines with depth. The results of linear fitting between SOC, BD, and depth show that SOC_ISA and BD_ISA have significantly declining trends, however, SOC_PSA and BD_PSA does not show such clear trend. In addition, SOC_PSA at the 60~100 cm soil layers is significantly higher than SOC_ISA but there is no stable correlation between them. (3) Carbon storage hidden under ISA of northern Tianshan urban cluster is 68% of the total urban carbon storage and for individual cities this percentage is higher than 50%, therefore, SOC_ISA is the main part of the urban SOC storage. By revealing the SOC_ISA and its distribution, this study can facilitate the understanding of biochemical characteristics of soils beneath urban ISA, which is significance for estimating carbon cycling in both urban and global ecosystems.

Key words: impervious surface areas, soil organic carbon, bulk density, northern Tianshan urban cluster, dryland

Yan YAN, Chi ZHANG, Wenhui KUANG, Geping LUO, Chunbo CHEN. Orgnic carbon charasteristics of soils beneath urban impervious surface in northern Tianshan urban cluster[J].PROGRESS IN GEOGRAPHY, 2015, 34(6): 781-789.

Figures/Tables 8

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References 44

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样本类型	SOC±SE/(kgC·m^-2)	CV/%	BD±SE/(g·cm^-3)	CV/%
ISA	5.74±0.39	45	1.58±0.02	6.09
PSA	8.69±0.75	35	1.51±0.02	4.96
差值(PSA- ISA)	2.95±0.76^**	133	-0.08±0.03^**	156.00

城市	样点数	SOC_PSA±SE	SOC_ISA±SE
乌鲁木齐—米泉	11	7.81±0.83	5.41±0.52
昌吉	2	11.83±3.43	7.10±1.16
石河子	3	10.04±0.56	8.26±1.00
奎屯	4	6.78±1.48	6.03±1.33
乌苏	4	6.72±1.57	4.26±0.78
克拉玛依	3	13.71±3.77	5.12±1.02
城市群平均		9.48±1.18	6.03±0.59
		CV=12%	CV=9.8%

	面积/km²			面积比例/%		碳储量/Tg			碳储量比例/%
	ISA		PSA		ISA	PSA	ISA(MN±SE)	PSA(MN±SE)	ISA	PSA
乌鲁木齐-米泉	223.58	70.80		75.95	24.05	1.26±0.12	0.55±0.06		69.6	30.4
昌吉	37.93	4.46		89.47	10.53	0.27±0.04	0.05±0.02		84.4	15.6
石河子	52.49	23.21		69.34	30.66	0.43±0.05	0.23±0.01		65.2	34.8
奎屯	33.19	19.33		63.20	36.80	0.2±0.04	0.13±0.06		60.6	39.4
乌苏	26.87	4.14		86.65	13.35	0.11±0.02	0.03±0.01		78.6	21.4
克拉玛依	28.84	10.76		72.83	27.17	0.15±0.15	0.15±0.04		50	50
总计	402.90	132.70		75.22	24.78	2.42	1.14		68	32

	气候特征	单位	土层/cm	非干旱区			干旱区天北城市群
	气候特征	单位	土层/cm	SOC_ISA		SOC_PSA	SOC_ISA		SOC_PSA
美国纽约(Raciti et al, 2012)	大陆性湿润气候	kgC·m^-2	0~15	2.29**	5.67**		1.77**		2.15**
美国纽约(Raciti et al, 2012)	大陆性湿润气候	kgC·m^-2	45~60	SOC_ISA与SOC_PSA间无显著差异			SOC_PSA显著高于SOC_ISA
中国南京(Wei et al, 2014)	湿润季风气候	kgC·m^-2	0~20	2.35	4.52		1.83	2.47
英国Leicester(Edmondson et al, 2012)	湿润海洋性气候	kgC·m^-2	0~21	SOC_ISA与SOC_PSA间无显著差异		SOC_PSA显著高于SOC_ISA
中国北京(Zhao et al, 2012)	半湿润大陆性季风气候	g·kg^-1	0~10	6.68	19.20	5.84		8.70
			10~20	6.76	16.71	5.46		7.72
			20~30	8.17	11.79	5.18		6.60
			30~40	7.32	10.27	4.72		6.02
			0~40	7.23	14.49	5.30		7.26

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Orgnic carbon charasteristics of soils beneath urban impervious surface in northern Tianshan urban cluster

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