SOIL ORGANIC CARBON AND NITROGEN DYNAMICS DURING THE RE-VEGETATION PROCESS IN THE ARID DESERT REGION

doi:10.17521/cjpe.2007.0009

Abstract

Abstract:

Aims It is an important aspect that the soil organic carbon and nitrogen sequestration or release contribute to the soil fertility and atmosphere CO₂. However, soil organic carbon and nitrogen dynamics has been argued during the process of desertification, the soil organic carbon and nitrogen is rarely explain during the re-vegetation process in the arid desert region. Furthermore, there have some debates about the relation between the soil particle content and soil organic carbon and nitrogen. So, the following questions toe will be sought (a) Does soil organic carbon and nitrogen content during the re-vegetation process differs in time and space? (b) How is there the relation between soil particle content and the soil organic carbon and nitrogen content?

Methods The distributions of particle size fractions, organic carbon and total nitrogen content in soils profile of 0-5 cm (include soil crust), 5-10 cm, and 10-20 cm at different years since re-vegetation were analyzed.

Important findings The results showed that soil organic carbon and nitrogen contents increased with time since re-vegetation but decreased with soil depth. Fine sand (0.1-0.05 mm), silt and clay (<0.05 mm) content showed similar temporal and spatial patterns. However, sand (0.5-0.1 mm) content decreased with time since re-vegetation and soil depth. Soil organic carbon and nitrogen contents positively correlated with the contents of fine sand and silt+clay (p<0.01) and negatively correlated with the sand content (p<0.01).From the point of view of the reversed desertification or re-vegetation process, our results suggest that change of land use can result in carbon sequestration because of the increment of soil protected carbon content in arid desert region. The spatial and temporal changes of soil organic carbon and nitrogen contents as indices for soil fertility may positively feed back to vegetation succession.

Key words: desert region, re-vegetation, soil organic carbon, total nitrogen

JIA Xiao-Hong, LI Xin-Rong, LI Yuan-Shou. SOIL ORGANIC CARBON AND NITROGEN DYNAMICS DURING THE RE-VEGETATION PROCESS IN THE ARID DESERT REGION[J]. Chin J Plant Ecol, 2007, 31(1): 66-74.

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Figures/Tables 6

References 31

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恢复年代 Age of re- vegetation	植被总盖度 Total vegetation coverage (%)	优势种 Dominant species	土壤结皮 Soil crust (cm)	土壤含水量 Soil moisture (%)	土壤微生物 Soil microbe amount (10³·g^-1)
1956	25.19	油蒿(Artemisia ordosica)、雾冰藜(Bassia dasyphylla)、小画眉草(Eragrostis poaeoides)	2.1	1.162	32 253.49
1964	27.67	油蒿(Artemisia ordosica)、雾冰藜(Bassia dasyphylla)、柠条(Caragana korshinskii)	1.0	1.170	63 794.88
1981	36.37	沙米(Agriophyllum squarrosum)、油蒿(Artemisia ordosica)	0.4	1.516	2 073.10
1987	30.00	油蒿(Artemisia ordosica)、沙木蓼(Atraphaxis bracteata)	0.3	2.027
1990	40.00	油蒿(Artemisia ordosica)、雾冰藜(Bassia dasyphylla)、小画眉草(Eragrostis poaeoides)	0.2	2.560
2000		雾冰藜(Bassia dasyphylla)、小画眉草(Eragrostis poaeoides)、沙米(Agriophyllum squarrosum)	-	2.720
流沙地 Shifting sand	<1.0	沙米(Agriophyllum squarrosum)、花棒(Hedysarum scoparium)	0	3.038	15 699.80

恢复年代 Age of re- vegetation	植被总盖度 Total vegetation coverage (%)	优势种 Dominant species	土壤结皮 Soil crust (cm)	土壤含水量 Soil moisture (%)	土壤微生物 Soil microbe amount (10³·g^-1)
1956	25.19	油蒿(Artemisia ordosica)、雾冰藜(Bassia dasyphylla)、小画眉草(Eragrostis poaeoides)	2.1	1.162	32 253.49
1964	27.67	油蒿(Artemisia ordosica)、雾冰藜(Bassia dasyphylla)、柠条(Caragana korshinskii)	1.0	1.170	63 794.88
1981	36.37	沙米(Agriophyllum squarrosum)、油蒿(Artemisia ordosica)	0.4	1.516	2 073.10
1987	30.00	油蒿(Artemisia ordosica)、沙木蓼(Atraphaxis bracteata)	0.3	2.027
1990	40.00	油蒿(Artemisia ordosica)、雾冰藜(Bassia dasyphylla)、小画眉草(Eragrostis poaeoides)	0.2	2.560
2000		雾冰藜(Bassia dasyphylla)、小画眉草(Eragrostis poaeoides)、沙米(Agriophyllum squarrosum)	-	2.720
流沙地 Shifting sand	<1.0	沙米(Agriophyllum squarrosum)、花棒(Hedysarum scoparium)	0	3.038	15 699.80

恢复年限 Year since re-vegetation (a)	0~5 cm (g·kg^-1)			5~10 cm (g·kg^-1)			10~20 cm (g·kg^-1)
恢复年限 Year since re-vegetation (a)	SOC	TN	C/N	SOC	TN	C/N	SOC	TN	C/N
0	0.23±0.01^a	0.01±0.01^a	22.92^a	0.26±0^a	0.01±0.01^a	26.03^a	0.24±0^a	0.01±0.01^a	24.21^a
4	0.93±0.02^a	0.11±0.01^b	8.45^b	0.96±0^a	0.10±0.01^b	9.60^b	0.90±0^abc	0.09±0.01^b	10.00^b
14	1.78±0.01^b	0.20±0.01^c	8.90^b	1.76±0^b	0.13±0.01^c	13.54^c	1.15±0^bc	0.11±0.01^b	10.45^b
17	1.76±0.11^b	0.21±0.03^c	9.37^bc	1.77±0.3^b	0.14±0.01^c	14.22^c	1.15±0.25^ab	0.11±0.01^b	10.66^b
23	2.54±0.18^b	0.26±0.04^c	9.50^bc	1.79±0.3^b	0.16±0.01^c	11.43^c	1.16±0.23^bc	0.12±0.02^b	10.66^b
40	4.42±0.41^c	0.35±0.04^d	12.37^c	2.38±0.33^c	0.20±0.04^d	13.21^c	1.43±0.2^c	0.14±0.03^b	11.83^bc
48	6.69±0.74^d	0.42±0.06^d	16.01^d	4.44±0.39^d	0.26±0.04^d	18.07^d	2.42±0.28^d	0.15±0.02^b	16.96^c

恢复年限 Year since re-vegetation (a)	0~5 cm (g·kg^-1)			5~10 cm (g·kg^-1)			10~20 cm (g·kg^-1)
恢复年限 Year since re-vegetation (a)	SOC	TN	C/N	SOC	TN	C/N	SOC	TN	C/N
0	0.23±0.01^a	0.01±0.01^a	22.92^a	0.26±0^a	0.01±0.01^a	26.03^a	0.24±0^a	0.01±0.01^a	24.21^a
4	0.93±0.02^a	0.11±0.01^b	8.45^b	0.96±0^a	0.10±0.01^b	9.60^b	0.90±0^abc	0.09±0.01^b	10.00^b
14	1.78±0.01^b	0.20±0.01^c	8.90^b	1.76±0^b	0.13±0.01^c	13.54^c	1.15±0^bc	0.11±0.01^b	10.45^b
17	1.76±0.11^b	0.21±0.03^c	9.37^bc	1.77±0.3^b	0.14±0.01^c	14.22^c	1.15±0.25^ab	0.11±0.01^b	10.66^b
23	2.54±0.18^b	0.26±0.04^c	9.50^bc	1.79±0.3^b	0.16±0.01^c	11.43^c	1.16±0.23^bc	0.12±0.02^b	10.66^b
40	4.42±0.41^c	0.35±0.04^d	12.37^c	2.38±0.33^c	0.20±0.04^d	13.21^c	1.43±0.2^c	0.14±0.03^b	11.83^bc
48	6.69±0.74^d	0.42±0.06^d	16.01^d	4.44±0.39^d	0.26±0.04^d	18.07^d	2.42±0.28^d	0.15±0.02^b	16.96^c

恢复年限 Year since re-vegeta- tion (a)	土壤颗粒组成分布 Distribution of particle size fractions (mm)
	0.5~0.1	0.1~0.05	<0.05	0.5~0.1	0.1~0.05	<0.05	0.5~0.1	0.1~0.05	<0.05
	0~5 cm			5~10 cm			10~20 cm
0	98.73±0^a	0.90±0^a	0.37±0^a	98.53±0^a	1.20±0^a	0.27±0^a	98.30±0^a	1.40±0^a	0.30±0^a
4	96.75±0^a	2.30±0^a	0.95±0^a	96.73±0^ab	2.30±0^a	0.97±0^ab	96.65±0^ab	2.49±0^ab	0.86±0^a
14	75.29±0^b	12.40±0^b	12.31±0^b	89.87±0^bc	6.07±0^b	4.06±0^bc	95.95±0^ab	2.86±0^ab	1.19±0^a
17	75.32±3.33^b	14.10±1.8^b	10.58±1.55^b	83.80±1.49^cd	9.10±0.78^bc	7.10±0^cd	92.26±1.12^bc	4.59±0.7^bc	3.16±0.51^b
23	69.83±4.88^b	16.34±2.9^bc	13.83±2.25^b	81.09±2.53^de	11.38±1.57^cd	7.53±0.96^cd	89.24±0.69^c	6.39±0.39^c	4.37±0.41^bc
40	59.00±4.52^c	20.44±2.28^c	20.57±2.26^c	75.71±3.32^ef	13.82±1.61^de	10.48±1.75^d	84.81±2.2^d	9.08±1.38^d	6.12±0.97^cd
48	57.65±4.98^d	20.33±1.71^c	22.02±3.28^c	70.17±4.65^f	15.13±2.25^e	14.70±2.4^e	81.85±3.05^d	10.81±1.79^d	7.34±1.3^d