Environmental factors influencing soil organic carbon and its characteristics in desert grassland in Altay， Xinjiang

doi:10.11686/cyxb2020389

Abstract

Abstract:

The aim of this research was to explore the spatial distribution characteristics of soil organic carbon in desert grassland in the Altay region of Xinjiang. We investigated 104 sampling plots using a combination of transect surveys and conventional plot layouts in August 2018， and collected soil samples for 0-5 cm， 5-10 cm and 10-20 cm soil depths in the centre of the sample plots. The factors influencing the content and spatial variation of soil organic carbon density were evaluated using quantitative ecology and geostatistics methodologies. It was found that the range for desert soil organic carbon content was 0.98-11.80 g·kg^-1in the 0-20 cm layer， with an average value of 3.79 g·kg^-1. The soil organic carbon density was 257.57-2904.19 g·m^-2 in 0-20 cm layer， with an average value of 1057.49 g·m^-2. With increasing soil depth， the soil organic carbon content （0-5 cm，5-10 cm，10-20 cm） and density （0-10 cm，10-20 cm） decreased. Localities with high soil C values were mainly concentrated in the northern part of Fuyun County， while areas with low soil C were mainly distributed in Habahe County， Burqin County and southern Fuhai County. In different desert subtypes， the content and density of organic carbon ranked： soil desert>gravel sandy desert>gravelly desert>sandy desert. The values for organic carbon content and organic carbon density in soil of the soil desert soil were， respectively 1.74 and 1.72 times those of the sandy desert soil （P<0.05）. From the results of redundancy analysis， the proportion of variation in soil organic carbon by various environmental factors was 30.93%， with the leading explanatory factors being vegetation cover， soil∶rock ratio， and soil moisture level in the root zone. This study has updated and expanded the available data on soil organic carbon pools in desert grassland in the Altay area and clarified the leading factors of organic carbon change， and has provided data support for desert grassland management， sustainable utilization and carbon budgeting.

Key words: soil organic carbon, desert grassland, Altay region, redundancy analysis, factors influencing soil C

Hui-xia LIU, Yi-qiang DONG, Yu-xuan CUI, Xing-hong LIU, Pan-xing HE, Qiang SUN, Zong-jiu SUN. Environmental factors influencing soil organic carbon and its characteristics in desert grassland in Altay， Xinjiang[J]. Acta Prataculturae Sinica, 2021, 30(10): 41-52.

Figures/Tables 9

References 36

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土层 Soil layer （cm）	变量 Variable	均值 Mean	中位数 Median	标准差 Standard deviation	偏度 Skewness	峰度 Kurtosis	最小值 Min	最大值 Max	变异系数 Coefficient of variation （%）	P值 P-value
0~5	SOC （g·kg^-1）	4.43	3.83	2.55	1.59	3.68	0.89	15.51	57.56	0.16
0~5	SOCD （g·m^-2）	313.07	261.36	168.74	1.18	1.22	80.03	820.88	53.90	0.06
5~10	SOC （g·kg^-1）	3.71	3.16	2.11	1.64	3.65	0.50	11.68	56.87	0.11
5~10	SOCD （g·m^-2）	265.35	232.09	143.11	1.35	2.21	44.81	796.13	53.93	0.10
10~20	SOC （g·kg^-1）	3.51	3.16	1.87	1.08	1.48	0.92	10.00	53.28	0.10
10~20	SOCD （g·m^-2）	479.07	421.25	259.45	1.09	1.13	99.06	1287.17	54.16	0.06
0~20	SOC （g·kg^-1）	3.79	3.64	1.99	1.44	3.05	0.98	11.80	52.51	0.17
0~20	SOCD （g·m^-2）	1057.49	945.87	534.91	1.19	1.53	257.57	2904.19	50.58	0.19

土层 Soil layer （cm）	变量 Variable	均值 Mean	中位数 Median	标准差 Standard deviation	偏度 Skewness	峰度 Kurtosis	最小值 Min	最大值 Max	变异系数 Coefficient of variation （%）	P值 P-value
0~5	SOC （g·kg^-1）	4.43	3.83	2.55	1.59	3.68	0.89	15.51	57.56	0.16
0~5	SOCD （g·m^-2）	313.07	261.36	168.74	1.18	1.22	80.03	820.88	53.90	0.06
5~10	SOC （g·kg^-1）	3.71	3.16	2.11	1.64	3.65	0.50	11.68	56.87	0.11
5~10	SOCD （g·m^-2）	265.35	232.09	143.11	1.35	2.21	44.81	796.13	53.93	0.10
10~20	SOC （g·kg^-1）	3.51	3.16	1.87	1.08	1.48	0.92	10.00	53.28	0.10
10~20	SOCD （g·m^-2）	479.07	421.25	259.45	1.09	1.13	99.06	1287.17	54.16	0.06
0~20	SOC （g·kg^-1）	3.79	3.64	1.99	1.44	3.05	0.98	11.80	52.51	0.17
0~20	SOCD （g·m^-2）	1057.49	945.87	534.91	1.19	1.53	257.57	2904.19	50.58	0.19

项目 Item	统计量 Statistic		0~5 cm		5~10 cm		10~20 cm		0~20 cm
项目 Item	统计量 Statistic		第1轴Axis1	第2轴Axis2	第1轴Axis1	第2轴Axis2	第1轴Axis1	第2轴Axis2	第1轴Axis1	第2轴Axis2
冗余分析RDA	特征值Characteristic value		0.32	0.03	0.29	0.03	0.24	0.08	0.26	0.05
	解释量 Explain content （%）		32.01	34.69	29.39	32.74	24.07	31.79	25.59	30.93
	变量-环境因子关系Variable-environment correlations		0.57	0.95	0.55	0.95	0.51	0.93	0.52	0.97
	累计解释量 Cumulative interpretation （%）		92.28	100.00	89.75	100.00	75.72	100.00	82.73	100.00
置换检验 Displacement	所有轴 All axis	F	3.1		2.9		2.7		2.6
置换检验 Displacement	所有轴 All axis	P	0.002		0.002		0.002		0.002

项目 Item	统计量 Statistic		0~5 cm		5~10 cm		10~20 cm		0~20 cm
项目 Item	统计量 Statistic		第1轴Axis1	第2轴Axis2	第1轴Axis1	第2轴Axis2	第1轴Axis1	第2轴Axis2	第1轴Axis1	第2轴Axis2
冗余分析RDA	特征值Characteristic value		0.32	0.03	0.29	0.03	0.24	0.08	0.26	0.05
	解释量 Explain content （%）		32.01	34.69	29.39	32.74	24.07	31.79	25.59	30.93
	变量-环境因子关系Variable-environment correlations		0.57	0.95	0.55	0.95	0.51	0.93	0.52	0.97
	累计解释量 Cumulative interpretation （%）		92.28	100.00	89.75	100.00	75.72	100.00	82.73	100.00
置换检验 Displacement	所有轴 All axis	F	3.1		2.9		2.7		2.6
置换检验 Displacement	所有轴 All axis	P	0.002		0.002		0.002		0.002

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