荒漠草原灰钙土与风沙土水分时空特征

doi:10.13866/j.azr.2023.10.09

Abstract

Abstract:

Due to the interference from human activities and natural factors, the primary sierozem area in the Ningxia desert steppe has gradually shrunk due to long-term desertification and formed island patches within the surrounding aeolian soil. To reveal the spatiotemporal characteristics of soil moisture after sierozem desertification, a comparative study was carried out between the large (200-300 m²), medium (approximately 100 m²), and small (approximately 50 m²) sierozem patches and the surrounding aeolian soil in Wanjigou Village, Yanchi County, Ningxia, during the growing season (May to October from 2017 to 2019). The uniform rainfall pattern in 2017 led to the highest annual average soil moisture content. While the annual rainfall in 2018 was slightly higher than that in 2017, it was concentrated in the spring, and there were almost no rainfall events in the summer and autumn, resulting in a low soil moisture content throughout the year. The summer rainfall pattern in 2019 resulted in the highest average soil moisture content during the summer period. The soil moisture content of sierozem in the 0-100 cm soil layer first showed an increase and then a decrease with increases in soil depth and was greatest in the 10-40 cm soil layer. The soil moisture content of the aeolian soil increased with soil depth, and the soil moisture content of the 0-20 cm soil layer was much lower than that of the 20-100 cm layer. The moisture content of sierozem in the 0-20 cm soil layer was greater than that of the aeolian soil, while the moisture content of the sierozem in the 20-100 cm soil layer was significantly lower than that of the aeolian soil (except for small and medium-sized patches in 2018). There was no significant difference (P > 0.05) in the soil moisture content of the sierozem between the different patch sizes, except that the soil moisture content of the aeolian soil surrounding the large-sized patches was significantly greater than that of the small and medium-sized patches (P < 0.05). The water storage of sierozem in the 0-100 cm soil layer was generally lower than that of the aeolian soil, and the variation range was smaller than that of the aeolian soil during the same period. When the rainfall was <16 mm, the water in both soil types was in a consumption state. When the rainfall ranged from 16 to 25 mm, the water storage capacity of the sierozem was greater than that of the aeolian soil, but when the rainfall was >25 mm, the water storage capacity of the aeolian soil was greater than that of the sierozem. The soil moisture content in the desert steppe was dominated by the rainfall, its distribution pattern, and soil type. The moisture contents of the sierozem and aeolian soils differ in their profiles, as well as in response to rainfall.

Key words: desert steppe, soil moisture, soil type, precipitation changes, soil water storage

YANG Shuangqi, SONG Naiping, WANG Xing, CHEN Xiaoying, CHANG Daoqin. Spatiotemporal characteristics of sierozem and aeolian soil moisture levels in a desert steppe[J].Arid Zone Research, 2023, 40(10): 1625-1636.

Figures/Tables 8

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降雨级别	2017年				2018年
降雨级别	降雨次数/次	降雨量/mm		占总降雨量比例/%	降雨次数/次	降雨量/mm	占总降雨量比例/%	降雨次数/次	降雨量/mm	占总降雨量比例/%
Ⅰ	8		4	1.5	-	-	-	5	2.76	1.2
Ⅱ	14		38.2	14.4	2	2.4	0.9	11	32.14	13.6
Ⅲ	4		30	11.3	2	14.6	5.3	4	27.42	11.6
Ⅳ	5		96.6	36.3	4	68	24.6	6	87.87	37.1
Ⅴ	3		97.2	36.5	3	191.8	69.3	2	86.84	36.6

年份	土层深度/cm	大斑块		中斑块		小斑块
年份	土层深度/cm	内部灰钙土	外部风沙土	内部灰钙土	外部风沙土	内部灰钙土	外部风沙土
2017年	0~10	4.67±1.39Bd	3.59±1.34Ac	4.45±1.48Ac	3.75±1.34Bb	4.70±1.53Ad	3.80±1.49Bb
	10~20	11.21±1.47Aa	10.50±1.71Ab	9.92±1.26Aa	9.04±1.56Ba	10.16±1.02Aa	9.93±1.68Aa
	20~40	9.31±1.25Ab	12.90±1.49Aa	8.86±0.76Aa	9.40±1.28Aa	8.86±1.04Bb	10.69±1.31Aa
	40~60	6.13±1.55Bcd	13.88±1.71Aa	7.11±1.20Bb	8.99±1.10Aa	7.10±1.21Bc	9.79±1.21Aa
	60~80	5.23±1.03Bd	12.91±1.23Aa	7.20±1.07Bb	8.76±1.28Aa	6.63±0.90Bc	9.09±1.03Aa
	80~100	7.07±0.18Bc	13.00±1.25Aa	7.26±0.65Bb	9.68±1.00Aa	6.79±0.45Bc	10.37±0.94Aa
2018年	0~10	4.01±0.61Ac	2.63±1.00Ba	3.94±0.97Ad	2.93±1.00Bc	4.29±1.11Ad	2.80±0.88Bc
	10~20	8.46±1.55Aa	7.98±2.05Ac	8.12±1.63Aa	7.00±1.66Ba	8.39±1.47Aa	7.50±2.33Aa
	20~40	6.70±1.16Bb	9.58±1.66Abc	6.92±1.12Ab	6.90±1.68Aa	7.05±1.18Ab	7.12±1.89Aa
	40~60	3.98±0.49Bc	10.95±1.34Ab	5.40±0.51Ac	5.11±0.81Ab	5.45±0.37Acd	5.36±0.78Ab
	60~80	4.06±0.72Bc	12.76±1.48Aa	5.56±0.67Ac	4.94±1.07Bb	4.99±0.45Ad	5.11±0.78Ab
	80~100	6.33±0.60Bb	13.84±1.29Aa	6.53±0.52Abc	6.18±0.97Aab	6.31±0.69Abc	6.73±1.01Aab
2019年	0~10	8.60±1.55Ab	7.63±1.37Bd	8.18±1.67Ab	6.41±1.37Bb	9.20±1.71Aa	6.88±1.20Bc
	10~20	10.36±1.49Aa	10.27±1.17Ac	9.82±1.45Aa	9.12±1.30Aa	10.15±1.35Aa	9.79±1.33Aa
	20~40	6.39±1.13Bc	14.21±1.81Ab	7.17±1.01Bb	8.77±0.93Aa	7.30±1.43Bb	8.92±1.27Aab
	40~60	4.34±0.85Bd	15.61±2.64Ab	5.87±1.19Bc	7.50±1.55Aab	6.07±1.43Bb	7.81±1.47Abc
	60~80	5.50±0.54Bcd	19.05±2.12Aa	6.71±1.24Bbc	8.06±2.11Aab	6.42±0.66Ab	7.43±1.49Abc
	80~100	8.80±0.64Bb	19.29±1.66Aa	6.96±1.17Bbc	8.81±2.25Aa	7.04±0.42Bb	9.11±1.31Aab

年份	土层深度/cm	内部灰钙土			外部风沙土
年份	土层深度/cm	大斑块	中斑块	小斑块	大斑块	中斑块	小斑块
2017年	0~100	7.13±0.93A	7.52±0.74A	7.36±0.86A	11.95±1.12A	8.65±1.00B	9.36±1.02B
2018年	0~100	5.46±0.63A	6.09±0.71A	6.03±0.57A	10.49±1.38A	5.62±1.01B	5.89±1.06B
2019年	0~100	6.90±0.75A	7.14±1.11A	7.30±0.95A	15.42±1.62A	8.18±1.20B	8.32±1.05B

Spatiotemporal characteristics of sierozem and aeolian soil moisture levels in a desert steppe

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