Climate Factors Affecting the Seasonal Variation of Soil Salinity Under Different Salinity Levels in Reclamation Area of Tidal Flats

doi:10.11924/j.issn.1000-6850.casb18090135

Abstract

Abstract:

To explore the variation rules of soil salinity under different salinity levels in reclamation area of tidal flats, we set a field experiment [including 3 levels of salinity: low salinity (LS), medium salinity (MS), and heavy salinity (HS)] in tidal flats of Rudong, Jiangsu from May 2014 to May 2015 to determine the dynamic changes of soil salinity and climate factors. The results showed that: (1) the surface salinity showed significant salt accumulation from September to December at MS and HS level with the maximum value in October as 26.66 g/kg and 14.13 g/kg, respectively; however, there was no significant seasonal change of surface and subsurface salinity at LS level with the fluctuation from 0.50 to 2.00 g/kg and 1.20 to 2.90 g/kg, respectively; (2) at MS, HS levels, the change of surface salinity was negatively correlated with precipitation, and had a significantly positive correlation with the vapor-drop ratio; meanwhile, there was a significantly positive correlation between soil salinity and atmospheric temperature at LS level. Therefore, some artificial measures such as planting vegetation and straw mulching to intensify the effects of precipitation on soil salinity change can be adopted to take full advantage of the characteristics of precipitation concentration in coastal areas, which maybe an important measure to reduce salinity in coastal beaches in the future.

Key words: reclamation of tidal flats, salinity dynamics, soil salinization, climatic factors, precipitation, atmospheric temperature, atmospheric evaporation

CLC Number:

S156.4

Zhang Jiao, Wang Bo, Zhai Caijiao, Huang Zhaoping, Cui Shiyou. Climate Factors Affecting the Seasonal Variation of Soil Salinity Under Different Salinity Levels in Reclamation Area of Tidal Flats[J]. Chinese Agricultural Science Bulletin, 2020, 36(2): 97-103.

Figures/Tables 7

References 31

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土层/cm	处理	盐分/ (g/kg)	pH_1:5	有机质/ (g/kg)	全氮/ (g/kg)	碱解氮/ (mg/kg)	有效磷/ (mg/kg)	速效钾/ (mg/kg)	容重/ (g/cm³)	孔隙度/ %	土壤颗粒组成/%
土层/cm	处理	盐分/ (g/kg)	pH_1:5	有机质/ (g/kg)	全氮/ (g/kg)	碱解氮/ (mg/kg)	有效磷/ (mg/kg)	速效钾/ (mg/kg)	容重/ (g/cm³)	孔隙度/ %	砂粒	粉粒	粘粒
0~20	HS	11.88a	8.47b	5.55a	0.57a	20.43b	12.85a	236.6a	1.39a	47.70a	19.48b	59.00a	21.52a
	MS	4.41b	8.71b	5.81a	0.50a	31.02a	9.66a	207.0b	1.38a	47.97a	23.48a	55.40b	21.12a
	LS	1.23c	9.20a	5.62a	0.54a	31.22a	9.88a	206.0b	1.42a	46.56a	19.68b	59.20a	23.32a
20~40	HS	17.05a	8.16b	4.81a	0.45a	16.02b	7.67a	250.8a	1.50a	43.42ab	18.10b	59.83a	22.05a
	MS	7.88b	8.33b	4.79a	0.39a	20.58a	6.49a	211.4b	1.47a	44.36a	23.48a	55.20b	21.32a
	LS	2.50c	8.99a	4.80a	0.37a	21.32a	6.87a	184.6c	1.54a	41.91b	21.08ab	57.00ab	22.32a

土层/cm	处理	盐分/ (g/kg)	pH_1:5	有机质/ (g/kg)	全氮/ (g/kg)	碱解氮/ (mg/kg)	有效磷/ (mg/kg)	速效钾/ (mg/kg)	容重/ (g/cm³)	孔隙度/ %	土壤颗粒组成/%
土层/cm	处理	盐分/ (g/kg)	pH_1:5	有机质/ (g/kg)	全氮/ (g/kg)	碱解氮/ (mg/kg)	有效磷/ (mg/kg)	速效钾/ (mg/kg)	容重/ (g/cm³)	孔隙度/ %	砂粒	粉粒	粘粒
0~20	HS	11.88a	8.47b	5.55a	0.57a	20.43b	12.85a	236.6a	1.39a	47.70a	19.48b	59.00a	21.52a
	MS	4.41b	8.71b	5.81a	0.50a	31.02a	9.66a	207.0b	1.38a	47.97a	23.48a	55.40b	21.12a
	LS	1.23c	9.20a	5.62a	0.54a	31.22a	9.88a	206.0b	1.42a	46.56a	19.68b	59.20a	23.32a
20~40	HS	17.05a	8.16b	4.81a	0.45a	16.02b	7.67a	250.8a	1.50a	43.42ab	18.10b	59.83a	22.05a
	MS	7.88b	8.33b	4.79a	0.39a	20.58a	6.49a	211.4b	1.47a	44.36a	23.48a	55.20b	21.32a
	LS	2.50c	8.99a	4.80a	0.37a	21.32a	6.87a	184.6c	1.54a	41.91b	21.08ab	57.00ab	22.32a

相关系数r	降雨量	蒸发量	光照时数	大气温度
降雨量	1	-0.02	-0.55^**	0.55^**
蒸发量	-0.02	1	0.67^**	0.69^**
累积日照时数	-0.55^**	0.67^**	1	0.03
大气温度	0.55^**	0.69^**	0.03	1

相关系数r	降雨量	蒸发量	光照时数	大气温度
降雨量	1	-0.02	-0.55^**	0.55^**
蒸发量	-0.02	1	0.67^**	0.69^**
累积日照时数	-0.55^**	0.67^**	1	0.03
大气温度	0.55^**	0.69^**	0.03	1

土层/cm	处理	降雨量	大气温度	光照时数	蒸发量	蒸降比
0~20	LS	0.005	0.178^*	0.000	0.050	0.016
	MS	0.234^*	0.047	0.297^**	0.061	0.292^**
	HS	0.183^*	0.060	0.136	0.004	0.267^**
20~40	LS	0.087	0.225^*	0.003	0.088	0.036
	MS	0.006	0.000	0.040	0.012	0.121
	HS	0.036	0.080	0.003	0.034	0.022