Secondary Salinization Research Articles

Root proteomics reveals cucumber 24-epibrassinolide responses under Ca(NO3)2 stress.

The application of exogenous 24-epibrassinolide promotes Brassinosteroids intracellular signalling in cucumber, which leads to differentially expressed proteins that participate in different life process to relieve Ca(NO 3 ) 2 damage. NO3 (-) and Ca(2+) are the main anion and cation of soil secondary salinization during greenhouse cultivation. Brassinosteroids (BRs), steroidal phytohormones, regulate various important physiological and developmental processes and are used against abiotic stress. A two-dimensional electrophoresis gel coupled with MALDI-TOF/TOF MS was performed to investigate the effects of exogenous 24-epibrassinolide (EBL) on proteomic changes in cucumber seedling roots under Ca(NO3)2 stress. A total of 80 differentially accumulated protein spots in response to stress and/or exogenous EBL were identified and grouped into different categories of biological processes according to Gene Ontology. Under Ca(NO3)2 stress, proteins related to nitrogen metabolism and lignin biosynthesis were induced, while those related to cytoskeleton organization and cell-wall neutral sugar metabolism were inhibited. However, the accumulation of abundant proteins involved in protein modification and degradation, defence mechanisms against antioxidation and detoxification and lignin biosynthesis by exogenous EBL might play important roles in salt tolerance. Real-time quantitative PCR was performed to investigate BR signalling. BR signalling was induced intracellularly under Ca(NO3)2 stress. Exogenous EBL can alleviate the root indices, effectively reduce the Ca(2+) content and increase the K(+) content in cucumber roots under Ca(NO3)2 stress. This study revealed the differentially expressed proteins and BR signalling-associated mRNAs induced by EBL in cucumber seedling roots under Ca(NO3)2 stress, providing a better understanding of EBL-induced salt resistance in cucumber seedlings. The mechanism for alleviation provides valuable insight into improving Ca(NO3)2 stress tolerance of other horticultural plants.

An evaluation of supervised classifiers for indirectly detecting salt-affected areas at irrigation scheme level

Soil salinity often leads to reduced crop yield and quality and can render soils barren. Irrigated areas are particularly at risk due to intensive cultivation and secondary salinization caused by waterlogging. Regular monitoring of salt accumulation in irrigation schemes is needed to keep its negative effects under control. The dynamic spatial and temporal characteristics of remote sensing can provide a cost-effective solution for monitoring salt accumulation at irrigation scheme level. This study evaluated a range of pan-fused SPOT-5 derived features (spectral bands, vegetation indices, image textures and image transformations) for classifying salt-affected areas in two distinctly different irrigation schemes in South Africa, namely Vaalharts and Breede River. The relationship between the input features and electro conductivity measurements were investigated using regression modelling (stepwise linear regression, partial least squares regression, curve fit regression modelling) and supervised classification (maximum likelihood, nearest neighbour, decision tree analysis, support vector machine and random forests). Classification and regression trees and random forest were used to select the most important features for differentiating salt-affected and unaffected areas. The results showed that the regression analyses produced weak models (<0.4 R squared). Better results were achieved using the supervised classifiers, but the algorithms tend to over-estimate salt-affected areas. A key finding was that none of the feature sets or classification algorithms stood out as being superior for monitoring salt accumulation at irrigation scheme level. This was attributed to the large variations in the spectral responses of different crops types at different growing stages, coupled with their individual tolerances to saline conditions.

Plasticity in the reproductive biology of the smooth marron Cherax cainii (Decapoda: Parastacidae): A large freshwater crayfish of south-western Australia

Considerable intra-specific variability in biological traits can exist in freshwater crayfishes including those of most importance to fisheries managers. Smooth Marron (Cherax cainii) is the third largest freshwater crayfish in the world, is endemic to south-western Australia, and supports an iconic recreational fishery that has been under pressure due to environmental change (principally secondary salinisation and reduced rainfall). The fishery consists of numerous discrete populations fished from both dams and rivers and the potential variability in key reproductive biology traits among them had not been previously quantified. The current study aimed to quantify the size at maturity and fecundity of C. cainii among stocks/populations to help facilitate sustainable management of the fishery. Eleven rivers and four dams (that represented the great majority of the overall annual recreational catch) were surveyed across ∼800km of latitudinal range prior to and during the spring breeding period. Additionally, historical data were sourced from previous studies conducted in 1968, 1978, and 1999 for three of the populations. Overall size at maturity OCL50 (orbital carapace length at which 50% of the female population were mature) among all populations was 48.8 (95% CI: 47.0–50.8) mm but varied greatly among populations, ranging from 30.4–66.7mm. There was no evidence that female size at maturity had changed over time in two populations where historical data was available. Mean ovarian and pleopodal fecundity was 583.8 (±33.1) and 389.1 (±18.9) eggs, respectively. Ovarian and pleopodal fecundity differed significantly among populations and ovarian, but not pleopodal fecundity, also differed between those populations from rivers versus those from dams. Some temporal change in ovarian and pleopodal fecundity was detected but this change was not consistent between populations. The variability in traits revealed here was most likely due to combinations of biotic and abiotic factors, with temperature found to be significantly positively related to size at maturity of female C. cainii in rivers, likely due to its effects on growth rates of C. cainii. However, several other potential factors including productivity of the systems, genetic differences among populations, and the disparate physical characteristics between rivers and dams, are also likely to contribute to the overall variability of the traits. The study has implications for the management of the fishery; for example, setting minimum legal sizes to ensure at least some of each population can reproduce before becoming exposed to fishing. A better understanding of the major factors driving this biological plasticity is required to enable predictions of how this may vary under future environmental changes.

Short- and long-term consequences of developmental saline stress: impacts on anuran respiration and behaviour.

Secondary salinization has been identified as a major stressor to amphibians. Exposure to elevated salinity necessitates physiological adjustments and biochemical changes that may be energetically demanding. As such, exposure to non-lethal levels of salinity during development could potentially alter anuran metabolic rates and individual performance in both pre- and post-metamorphic life stages. We investigated the effects of non-lethal levels of salinity on metamorphic traits (time to reach metamorphosis and metamorphic mass), tadpole oxygen consumption, escape response behaviour (pre- and post-metamorphosis) and foraging ability post-metamorphosis in two native Australian frog species, the southern brown tree frog (Litoria ewingii) and the striped marsh frog (Limnodynastes peronii). We found that both Lit. ewingii and Lim. peronii exhibited differences in metamorphic traits in response to elevated salinity. Neither species showed significant change in oxygen consumption during development in response to salinity, relative to freshwater controls. Both species displayed impaired escape response behaviours in response to salinity during larval development, but flow-on effects to adult escape response behaviours and foraging performance were species-specific. Our results show that the influence of stressors during development can have consequences for anuran physiology and behaviour at multiple life stages, and emphasize the need for studies that examine the energetics of anuran responses in order to better understand the responses of biota to stressful environments.

Current Status and Expectation of Salt Containing Waste Water Discharged from Oil Production and Its Treatment

In this paper, we review the current status about the salt containing waste water discharged from oil production. Currently, most of the waste water discharged from oil production in China has not been treated by desalination. Soilsalinization has been an important environment problem. The salt-containing composition and mineralization degree data of reservoir water in major oil and gas fields of China were summarized. It can be seen that the reported data show very different and complex distribution of salt-containing composition of reservoir water. The application of computer simulation canimprove the prediction of the analytical data. The predicted data of water and salt concentration in the soil can be used to determine the boundary condition and initial condition of the simulation, and the limit of the sampling can be thus avoided. The results of the study will provide a scientific basis for environmental protection to build the standards of the salt contents of waste water and to prevent secondary salinization of soil of oil fields.

Prediction of salt transport in different soil textures under drip irrigation in an arid zone using the SWAGMAN Destiny model

In recent years, Xinjiang Oasis has faced a major challenge of increasing risk of secondary salinization caused by drip irrigation under plastic mulch. Predicting the salt balance is therefore essential for understanding how to sustain the use of salinized land in this arid area. This research validated the SWAGMAN (Salt, Water And Groundwater MANagement) Destiny model to simulate and forecast the movement of salt in different soil textures based on field experiments. The results were verified with extensive field work in Shihutan, Xinjiang, China. They show that soil salinity decreases in the upper layers and increases in the bottom layers of the investigated soil profile. The desalinization rate in sand, which shows an overall steady trend throughout the soil profile, is generally higher than that in loam and clay. The depth of 60cm is critical for loam and clay; soil salinity decreases above it but increases below it. Model sensitivity analysis reveals the variation of soil salinity is independent of the initial electrical conductivity setting of SWAGMAN Destiny simulations. This study indicates that numerical modelling is a useful approach for efficiently estimating the salt balance under drip irrigation. The result provides a scientific basis for making adaptive strategies to manage salinised farmlands in arid zones.

Delineation and characterization of salt-affected soils in Varanasi district of Uttar Pradesh

Salt affected soils are primarily widespread over Uttar Pradesh especially in irrigated areas of the vast middle Indo-Gangetic alluvial plain of shallow water table depth and hot and dry moisture regions. Soil salinity and alkalinity are two of the main constraints present in these irrigated agricultural lands and the problem of salinity and alkalinity increases every year as a result of secondary salinisation and as a result of which the fertile productive land is gradually becoming unproductive. Varanasi district of Uttar Pradesh have been identified to the intensive area study site for this research work. Study area is a part of the vast alluvial expanse popularly known as Indo Gangetic plains. The study area lies in hot semi arid eco region 4.3, between geo-coordinates 25o 18’’ N and 83o 03’’ E covering 1, 535 sq km area a part of the vast Indo-Gangetic alluvial plain having sandy soil, which also coincides with low rainfall. The result indicated that the soil reaction is moderately to strongly alkaline. The organic carbon was reported to vary from 0.11 to 0.88%. Under saturation extract analysis, sodium ion was observed as dominant cation, followed by Calcium, Magnesium and Potassium and alkali soil having high pH are deficient in both soluble and exchangeable calcium.

Hydrogeological modeling in Danube Valley using GIS techniques. Study case

&lt;p&gt;In hydrogeological and pedoclimatic conditions, specific to the Danube River, there is a danger of secondary salinization of soil excluded from the floods. The drought, with an increasing frequency, affects agricultural production in areas where the largest irrigation systems are found. These systems were built during 1960-1990, but they are dysfunctional and unused for 20 years.&lt;/p&gt;&lt;p&gt;The purpose of this study is to insure a model using GIS technologies, in order to reduce the negative effects of the drought and to propose redevelopment of irrigation. Such model is presented in a form of five thematic maps where the main morphometric parameters (hypsometry, slope, slope orientation), in quantitative terms, the types of soils and land use were analyzed for the entire surface of the villages Gostinu-Greaca-Arges, located in the Danube Floodplain. The GIS model provides important information for the investigated area and it is a useful tool for risk assessment and early-warning.&lt;/p&gt;&lt;p&gt;This study is based on observations from the maps interpretation of the studied area, but also from reports and studies published over the years.&lt;/p&gt;&lt;p&gt; &lt;/p&gt;&lt;p&gt;Keywords: The Danube River, drought, soil, irrigation.&lt;/p&gt;

A salinização do solo em Portugal. Causas, extensão e soluções

Soil salinization is a major soil degradation process. In Portugal, this problem is limited to marshes and some irrigated areas located in the south of the country. However, the increase of the irrigated area and the prospects of climate change for the coming decades, including rising temperatures, can lead to an increase of the degraded areain Portugal. This paper describes the main causes of soil salinization/sodicization, the most relevant indicators, and the most used classifications. The main areas in Portugal affected, either by natural salinization or by secondary salinization, are also indicated. Then,some of the most relevant studies related to saline soilsmapping, the use of saline and sodic soils, and the use of poor quality waters conducted in Portugal,are also reviewed. Finally, the main methods for preventing and recovering saline/sodic soils are addressed.

Nitrogen Accumulation and Loss in a High-input Greenhouse Vegetable Cropping System Elevated by Application of Manures

Much nitrogen (N) is lost in high-input protected cropping systems mainly via leaching of not only nitrate-N but also extractable organic N (EON), but the role of EON in this process is poorly appreciated. A consecutive 3-year plot experiment was conducted to investigate the impact of co-application of manures with chemical N fertilizer on N accumulation and loss in a greenhouse soil rotationally planted with cucumber or tomato and lettuce. Application of manures significantly enhanced the average contents and stocks of NO3−-N, EON, and total N (TN) in 0- to 60-cm soil layer, although EON accumulated within growing season, while NO3−-N accumulated with fluctuation, and TN accumulated gradually throughout the 3-year experiment. With application rate at 120 or 180 t dry manures per hectare per 3 years, the corresponding apparent N surplus was 2710 or 3924 kg⋅ha−1 per 3 years. Due to little increase of biomass N uptakes during vegetable seasons, the accumulated N in soil profile would be a potential loss source, largely via leaching of both nitrate and EON. Application of manures slowed soil acidification but intensified secondary salinization of the greenhouse soil. Considering the manures-induced high soil N accumulation and loss, well-balanced evaluation of the role of manures in high-input agricultural ecosystems is needed.

Creation of soil-like constructions

An innovative approach for artificial soil construction is briefly characterized, and its basic principles are given. The major kinds of soil constructions and materials used for their creation are discussed. Quantitative aspects of the formation of layered soil constructions for irrigation farming and greening of urban areas under high anthropogenic loads are examined. Technological design of these constructions is based on modeling energy and mass fluxes in soil systems with the use of HYDRUS-1D software. Technological approaches for the application of biopolymer materials into different soil layers with the aim to increase the soil water capacity, protect the soils from secondary salinization and contamination with water-soluble pollutants, and improve the resistance of these materials toward biological destruction are discussed. The tests of the layered soil constructions in some countries of the Persian Gulf and in Moscow have proved their high efficiency. The productivity of green plantations can be increased by 1.5–2 times owing to the increased efficiency of water consumption and protection of the root zone from soluble salts under conditions of the natural or technogenic salinization (contamination) and deficit of precipitation.

Rhizospheric Denitrification Potential and Related Microbial Characteristics Affected by Secondary Salinization in a Riparian Soil

A pot experiment with simulated saltwater incursion was conducted to study the effects of secondary salinization on the denitrification potential and related microbiological activities and size of the denitrifier community by real-time PCR quantification of denitrifying genes in a rhizospheric soil vegetated with different riparian plants. The results showed that saltwater incursion significantly inhibited denitrification potential in the riparian soil, with the average denitrification rate decreased by 34.9%. The inhibitory effects differed with the vegetation types. The rhizosphere soils of Acorus calamus and Phragmites australis showed a significantly lower inhibitory percent of the denitrification rate compared with the corresponding monoculture. Secondary salinization resulted in a decrease in the number of N-cycling microorganisms and in the activities of soil N-transforming enzymes, especially the number of denitrifiers and nitrite reductase activity, which exhibited declines of 51.5% and 43.5%, respectively. Real-time PCR quantification showed that the saltwater incursion significantly changed the abundance and composition of denitrifying genes in the riparian soil despite the vegetation types. The community size of narG was the most sensitive, while nosZ was the least affected by secondary salinization. There were significant differences in the responses of N-transforming microbiological activities and denitrifying gene abundance to secondary salinization in riparian soils with different vegetation types. The inhibition percents of N transforming-related enzyme activities and the abundances of denitrifying genes in the rhizospheric soil of A. calamus and P. australis were significantly lower compared with the pure plant community, indicating that mixed vegetation provided a significant alleviation of the inhibition of microbiological parameters and denitrification processes due to saltwater incursion in riparian soil. Principal component analysis (PCA) analysis indicated that the denitrification rate correlated significantly with the activities of N transform-related enzymes and the abundance of narG, nirK and nirS rather than nosZ.

Spatiotemporal Distribution of Soil Moisture and Salinity in the Taklimakan Desert Highway Shelterbelt

Salinization and secondary salinization often appear after irrigation with saline water. The Taklimakan Desert Highway Shelterbelt has been irrigated with saline ground water for more than ten years; however, soil salinity in the shelterbelt has not been evaluated. The objective of this study was to analyze the spatial and temporal distribution of soil moisture and salinity in the shelterbelt system. Using a non-uniform grid method, soil samples were collected every two days during one ten-day irrigation cycle in July 2014 and one day in spring, summer, and autumn. The results indicated that soil moisture declined linearly with time during the irrigation cycle. Soil moisture was greatest in the southern and eastern sections of the study area. In contrast to soil moisture, soil electrical conductivity increased from 2 to 6 days after irrigation, and then gradually decreased from 6 to 8 days after irrigation. Soil moisture was the greatest in spring and the least in summer. In contrast, soil salinity increased from spring to autumn. Long time drip-irrigation with saline groundwater increased soil salinity slightly. The soil salt content was closely associated with soil texture. The current soil salt content did not affect plant growth, however, the soil in the shelterbelt should be continuously monitored to prevent salinization in the future.

Influence of Secondary Salinity Wastewater on the Efficiency of Biological Treatment of Sand Filter

As preventive of possible environmental nuisances that can cause discharges water in nature, we undertook this study of the influence of salinity wastewater on the treatment efficiency of a biological filter consisting of dune sand.In this work, we designed six identical columns of filtration with sand from the same region of the N’Goussa city (located in the southeast of Algeria). The filters used are fed with wastewater at six different total salinity rates ranging from 0.065% to 0.265% corresponding to the electrical conductivity of 0.85 mS/cm to 3.5 mS/cm. This filtration efficiency was assessed by monitoring changes in the conductivity and the overall pH of the treated water and the chemical oxygen demand (COD). The results obtained showed that the change in the salinity of sewage water has a negative effect on the degradation of organic matter. Indeed, over the salt content is high, over the effectiveness of the biological treatment is reduced, suggesting in this type of case a prior desalination system and tests are under way in our laboratory.

Prioritising wetlands subject to secondary salinisation for ongoing management using aquatic invertebrate assemblages: a case study from the Wheatbelt Region of Western Australia

Secondary salinisation is recognised worldwide as a threat to aquatic biodiversity. Wetlands in the Wheatbelt Region of Western Australia are particularly affected as a result of clearing of deep-rooted native vegetation for agriculture. Between 1996 and 2001, the Western Australian government nominated six natural diversity recovery catchments (NDRCs), being catchments with high value and diverse wetlands in need of protection. One, the Buntine–Marchagee NDRC, supports approximately 1000 wetlands in varying states of salinisation. The challenge is to prioritise these wetlands for ongoing management. In this paper we propose an approach to prioritise representative wetlands using aquatic invertebrates. On the basis of hydrology, salinity and remnant vegetation, 20 wetlands covering a range of salinities were selected for sampling of water quality and aquatic invertebrates. Of the 202 taxa recorded, most endemic taxa occurred in fresh/brackish wetlands, while hypersaline wetlands supported predominantly cosmopolitan species. Taxa richness was greater in fresh/brackish than saline and hypersaline wetlands, with conductivity explaining 83 % of between-wetland variation in taxa richness. Classification using invertebrate assemblages separated fresh/brackish, saline and hypersaline wetlands, with greatest between-year variability within saline and hypersaline sites. Wetlands were ranked using taxa diversity, presence of conservation-significant taxa and temporal similarity. Mean rank across indices provided the final overall order of priority. Hypersaline wetlands were ordered separately to the fresher water wetlands (fresh/brackish and saline) so that priority for future management was detailed for both types of wetlands. The analysis indicated that although fresh/brackish sites support the highest biodiversity, naturally saline sites also supported wetland assemblages worthy of ongoing protection.

Effect of EM Bokashi application on control of secondary soil salinization

In order to ameliorate saline-alkaline soil, EM Bokashi has been applied to rice production in conjunction with subdrainage in Ningxia Autonomous Region and Zhejiang Province. The preliminary results can be summarized as follows: EM Bokashi can increase soil organic matter content, improve soil porosity and permeability, and raise the soil's levels of available nutrients; and EM Bokashi combined with subdrainage treatment is more effective in controlling secondary soil salinization and raising the grain yield and quality than other treatments. The results suggest that EM Bokashi can reduce the necessary amount of chemical fertilizer application, thereby improving the agricultural environment, and that the introduction of EM Bokashi into systems of secondary soil salinization control systems has resulted in significant benefits.

Desalination of saline farmland drainage water through wetland plants

To protect against soil secondary salinization, a desalination process for farmland drainage using wetlands was evaluated. In this study, the desalination effects of different plants in Chagan Lake were analyzed. A field experiment was conducted in the Qianguo irrigation district to choose the most efficient desalting plant by comparing the biomass contents and the ash rates of Typha spp., Phragmites communis, Phragmites japonica Steud. var. prostrata (Makino) L. Liu, Medicago sativa Linn., Lemna minor L. and Potamogeton crispus. Typha spp., Phragmites communis and Potamogeton crispus performed best among tested species in removing salt from saline farmland drainage. According to the calculated ash rates and ion contents, the amount of salt removed by reaping reed and cattail accounted for 10–26% of the salt in the drainage. The removal efficiencies of Ca2+, Mg2+, Na+, Cl− and SO42− ions are 9–15% per year. A constructed wetland containing 233–288km2 of Typha spp. is required so that the removal efficiency of these six ions can be more than 80%.

Simulating Groundwater Dynamics Using Feflow‐3D Groundwater Model Under Complex Irrigation and Drainage Network of Dryland Ecosystems of Central Asia

AbstractSurface and groundwater resources are often conjunctively used to cope with water scarcity in irrigated agriculture. Farmers in the dryland ecosystems of central Asia also utilize shallow groundwater in addition to surface water withdrawn from rivers. This study modelled groundwater dynamics in an irrigation and drainage network in Khorezm region, Uzbekistan. The system, characterized by a vast, unlined channel network used to convey water mainly for flood irrigation and an open drainage system, is typical of Central Asian irrigated areas. Groundwater levels in the region are shallow—this contributes to crop water requirements but threatens crop production through secondary salinization. High losses during irrigation in fields and through the irrigation network are the main causes of these shallow groundwater levels. The main objective of this study was thus to simulate groundwater levels under improved irrigation efficiency scenarios. The FEFLOW‐3D model, applied in a case study to the water users’ association (WUA) of Shomakhulum in south‐west Khorezm, was used to quantify the impact of improved irrigation efficiency scenarios on groundwater dynamics. The modelled scenarios were: current irrigation efficiency (S‐A, our baseline), improved conveyance efficiency (S‐B), increased field application efficiency (S‐C), and improved conveyance and application efficiency (S‐D). Recharge rates were separately determined for six hydrological response units (differing in groundwater level and soil type) and introduced into the FEFLOW‐3D model. After successful model calibration (R2 = 0.94) and validation (R2 = 0.93), the simulations showed that improving irrigation efficiency under existing agro‐hydroclimatic conditions would lower groundwater levels from the baseline scenario (S‐A) in August (the peak irrigation period) on average by 12 cm in S‐B, 38 cm in S‐C and 44 cm in S‐D. Any interventions which would improve irrigation efficiency will lower the groundwater levels and hence policy makers should consider them and formulate the policy accordingly. Copyright © 2015 John Wiley &amp; Sons, Ltd.

Evaluation of the Impact of Different Soil Salinization Processes on Organic and Mineral Soils

Soil salinization is a worldwide problem of which secondary salinization is increasingly more frequent, threatening agricultural production. Salt accumulation affects not only plants but also the physio-chemical characteristics of the soil, limiting its potential use. Climate change will further increase the rate of salinization of soil and groundwater as it leads to increased evaporation, promotes capillary rise of saline groundwater as well as increased irrigation with brackish water. Episodic seawater inundation of coastal areas is likely to increase in frequency as well. This work analyzed three types of salinization: seawater inundation (by irrigating soils with a 54 dS m−1 NaCl solution), saline groundwater capillary rise (soil contact with a 27 dS m−1 NaCl solution), and irrigation with two types of brackish water with different residual sodium carbonate (RSC). Two soils were used: a mineral soil (7.0 % clay; 0.7 % organic matter) and an organic soil (2.7 % clay; 7.4 % organic matter). The tested soils had different resilience to salinization: The mineral soil had higher sodium adsorption ratio (SAR) due to low levels of calcium + magnesium but had higher leaching efficiency and more limited effects of RSC. The organic soil however was more prone to capillary rise but seemingly more structurally stable. Our results suggest that short-term inundation with seawater can be mitigated by leaching although soil structure may be affected and that capillary rise of brackish groundwater should be carefully monitored. Also, the impact of irrigation with brackish water with high RSC can be inferior in soils with higher exchangeable acidity.

Improvement for the multi-scale periodic characteristics revealing of precipitation signals and its impact assessment on soil hydrological process by combining HHT and CWT approaches

Abstract. This study conducts a detailed analysis of multi-scale periodic features involved in the annual and seasonal precipitation signals at the typical coastal reclamation region in China by selecting the suitable continuous wavelet transform (CWT) and innovatively combining the improved Hilbert–Huang transform (HHT), and further deduces the precipitation trend and its impacts on the future soil hydrological process. The Morlet wavelet transform is proved suitable in revealing the precipitation signals broad-scale periodicities, however, the critical mode mixing problem in CWT causes the poor significance in the fine-scale periodicities, which cannot well match the climate background. By combining the HHT approach, the fine-scale mode mixing drawback in CWT is effectively eliminated, and the the studied precipitation signals multi-scale periodicities are accurately revealed. Consequently, an overall decreasing trend of annual and seasonal precipitation in future years is demonstrated. Furthermore, by novelly using the cross wavelet transform (XWT) and wavelet transform coherence (WTC) approaches, the prominent correlations between the precipitation dynamics and soil and groundwater salinities dynamics, it is demonstrated that the precipitation increase can effectively leach the surface soil salt downwards into the deeper soil layers and groundwater with 5–7-day lag in the new cultivated tidal land. The revealed future decreasing trend of precipitation, especially in spring and summer, may aggravate the soil salinization at the coastal reclamation region, thus some reasonable salt leaching and evaporation suppression measures need to be taken to prevent the possible soil secondary salinization process.