锡林郭勒草原土壤有机碳分布特征及其影响因素

doi:10.13866/j.azr.2021.05.17

Abstract

Abstract:

Soil organic carbon (SOC) is an important indicator of soil nutrient content and quality. The study of SOC in different steppe types assists ecological restoration and rational land use projects. This study was conducted in the Xilin Gol steppe, and used the Kriging interpolation, correlation analysis, unary linear regression, and principal component analysis to explore the spatial differentiation of SOC and identify its influencing factors. The results showed that: (1) In the meadow steppe, SOC content in 0-10 cm, 20-30 cm, and 40-50 cm soil layers was 23.28 g·kg^-1,12.71 g·kg^-1, and 9.28 g·kg^-1, respectively; in the typical steppe it was 16.75 g·kg^-1, 10.75 g·kg^-1, and 7.20 g·kg^-1, respectively; in the desert steppe, the content was 1.62 g·kg^-1, 2.00 g·kg^-1, and 1.73 g·kg^-1, respectively. Also, results showed that the SOC content in the meadow and typical steppes gradually decreased with the increase of soil depth, while there was no significant difference between different soil layers in the desert steppe. (2) Different steppe types had different influences on SOC content. For the same soil layer depth, the SOC content order was basically meadow steppe>typical steppe>desert steppe. The SOC content in the horizontal direction was consistent with the distribution of vegetation coverage, showing a trend of gradual decrease from southeast to northwest. (3) Correlation analysis showed that SOC was significantly (P<0.01) and negatively correlated with altitude, temperature, and pH; and significantly (P<0.01) and positively correlated with precipitation, soil water content, available nitrogen, and available phosphorus. It had no significant correlation (P>0.05) with slope, aspect, and available potassium. (4) The main factors affecting SOC were available nitrogen, precipitation, and temperature; the secondary factors were soil water content and available potassium. Therefore, attention should be paid to the control of nitrogen intake and hydrothermal conditions in different steppe types.

Key words: soil organic carbon, distribution characteristics, influencing factors, Xilin Gol steppe

CHANG Shuai,YU Hongbo,CAO Congming,MA Zice,LIU Yuexuan,LI Xiang. Distribution characteristics of soil organic carbon in Xilin Gol steppe and its influencing factors[J].Arid Zone Research, 2021, 38(5): 1355-1366.

Figures/Tables 11

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References 35

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草原类型	土层深度/cm	最小值/(g·kg^-1)	最大值/(g·kg^-1)	平均值/(g·kg^-1)	标准差	变异系数/%
草甸草原	0~10	11.59	31.94	23.28a	6.34	27.35
	20~30	4.53	18.54	12.71c	4.28	33.71
	40~50	0.91	13.93	9.28cd	4.16	44.79
典型草原	0~10	6.10	30.10	16.75b	6.86	40.96
	20~30	4.12	19.13	10.75cd	4.92	45.79
	40~50	3.54	12.78	7.20d	3.02	41.88
荒漠草原	0~10	0.70	4.30	1.62e	1.11	68.27
	20~30	0.86	4.88	2.00e	1.15	57.63
	40~50	0.69	3.32	1.73e	0.84	48.48

土层深度/cm	平均值±标准差/(g·kg^-1)	偏度	峰度	变异系数	K-S	分布类型
0~10	14.17±10.33	0.054	-1.351	72.917	0.096	正态分布
20~30	8.71±5.94	0.227	-1.273	68.178	0.190	正态分布
40~50	6.18±4.24	0.403	-0.950	68.573	0.200	正态分布

土层深度/cm	pH	速效磷/(mg·kg^-1)	速效钾/(mg·kg^-1)	速效氮/(mg·kg^-1)	海拔/m	坡度/(°)	坡向
0~10	-0.789^**	0.691^**	0.531^**	0.951^**	-0.295	0.284	-0.151
20~30	-0.601^**	0.701^**	0.179	0.872^**	-0.437^*	0.225	-0.130
40~50	-0.518^**	0.528^**	0.032	0.866^**	-0.385^*	0.270	-0.162

Distribution characteristics of soil organic carbon in Xilin Gol steppe and its influencing factors

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