Spatiotemporal Variations of Soil Water and Saline-alkali in Compound Ecosystem of Sand and Meadow in the Songnen Plain

doi:10.11924/j.issn.1000-6850.casb2020-0518

Abstract

Abstract:

To explore the spatiotemporal variations of soil water and saline-alkali in compound ecosystem of sand and meadow in the Songnen Plain, the soil water content (SWC), electrical conductivity (EC), and pH in 0-300 cm soil profile in sand, meadow and middle area (between sand and meadow) regions from May to September were analyzed. The results showed that the mean SWC in meadow region was 20.5% and 52.7% higher (P<0.01) than that of middle area region and sand region, respectively. In middle area region, higher SWC in 0-20 cm soil and lower SWC in 30-150 cm soil were observed in September. In meadow region, SWC was lower in 0-10 cm soil in July and it gradually declined with the increase of soil depth from 10 to 150 cm. The mean EC and mean pH in meadow and middle area regions were higher (P<0.01) than that of sand region. The mean EC in meadow region was 39.8% higher (P<0.01) than that of middle area region. In meadow region, higher EC and pH were observed in 0-10 cm soil in July and in 30-70 cm soil in September. In middle area region, higher EC and pH were observed in 0-10 cm soil in September. The surface soil saline-alkali mainly occurred in meadow region and middle area region in July and September, respectively, and the different saline-alkali degree of the two kinds of regions was determined by species, soil texture and soil water table level.

Key words: soil water content, pH, soil electrical conductivity, sand, meadow, middle area, Songnen plain

CLC Number:

Q149

Zhang Qilin, Hu Juan, Gao Yingzhi, Zhou Daowei. Spatiotemporal Variations of Soil Water and Saline-alkali in Compound Ecosystem of Sand and Meadow in the Songnen Plain[J]. Chinese Agricultural Science Bulletin, 2021, 37(20): 49-58.

Figures/Tables 10

References 41

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	最小值(Min)/%	最大值(Max)/%	平均值 (Mean)/%	标准差(SD)	变异系数(CV)/%
沙丘	4.01	11.07	9.20 cC	1.06	11.56
结合部	5.00	15.01	11.66 bB	1.64	14.10
草甸	7.61	17.65	14.05 aA	1.36	9.70

	最小值(Min)/%	最大值(Max)/%	平均值 (Mean)/%	标准差(SD)	变异系数(CV)/%
沙丘	4.01	11.07	9.20 cC	1.06	11.56
结合部	5.00	15.01	11.66 bB	1.64	14.10
草甸	7.61	17.65	14.05 aA	1.36	9.70

月份	沙丘			结合部			草甸
月份	土壤含水量	标准差	变异系数	土壤含水量	标准差	变异系数	土壤含水量	标准差	变异系数
5月	7.40abA	0.77	10.32	11.64aA	1.54	12.95	14.50aA	1.20	8.21
6月	6.26bB	0.74	10.72	9.41bB	0.95	9.98	12.56bB	1.25	10.24
7月	7.09abA	0.61	9.34	11.98aA	1.21	10.20	12.31bB	0.67	5.53
8月	8.10aA	0.91	11.72	10.62abA	1.96	17.74	13.82abA	1.51	10.52
9月	8.65aA	1.33	15.16	9.86bB	1.74	17.66	14.30aA	1.73	11.96

月份	沙丘			结合部			草甸
月份	土壤含水量	标准差	变异系数	土壤含水量	标准差	变异系数	土壤含水量	标准差	变异系数
5月	7.40abA	0.77	10.32	11.64aA	1.54	12.95	14.50aA	1.20	8.21
6月	6.26bB	0.74	10.72	9.41bB	0.95	9.98	12.56bB	1.25	10.24
7月	7.09abA	0.61	9.34	11.98aA	1.21	10.20	12.31bB	0.67	5.53
8月	8.10aA	0.91	11.72	10.62abA	1.96	17.74	13.82abA	1.51	10.52
9月	8.65aA	1.33	15.16	9.86bB	1.74	17.66	14.30aA	1.73	11.96

		最小值	最大值	平均值	标准差	变异系数/%
EC/(mS/m)	沙丘	19.7	28.3	23.5cC	1.12	4.77
	结合部	31.7	93.0	54.3bB	1.89	3.48
	草甸	41.7	144.3	75.9aA	2.55	3.36
pH	沙丘	8.01	8.33	8.14bB	0.013	0.16
	结合部	8.21	8.94	8.59aA	0.017	0.20
	草甸	8.22	9.00	8.64aA	0.018	0.21