共查询到20条相似文献，搜索用时 140 毫秒
1.
通过野外调查采样和土样化学测定,分析胀果甘草原生境下土壤盐分的特征。结果表明:研究区土壤盐分普遍较高且表聚作用明显,土壤表层0～10 cm土层盐分均值高达32+.08g/kg,属典型的强度盐渍化土;土壤盐分组成中,含阳离子Ca2+、Na+、Mg2+、K+和阴离子Cl-、SO24、HCO-3,不含CO2-3,土壤盐分的特征因子为Ca2+、C1-、SO2-4、NaCa+,其盐渍类型主要为硫酸盐-氯化物型,重碳酸盐是土壤盐分的次要成分;该生境土壤中在整个垂直剖面上Ca2+的含量丰富,属典型钙质土。 相似文献
2.
以克拉玛依人工碳汇林区的土壤可溶性盐分离子、地下水矿化度和植被为研究对象, 综合运用描述性统计和相关性分析等方法, 研究其景观地球化学特征, 旨在通过对克拉玛依人工碳汇林区的景观地球化学特征的研究, 为这一地区盐渍化土壤改良和沙漠化防治提供理论依据。结果表明: 克拉玛依人工碳汇林区土壤Cl-、SO42-、Ca2+在0~80 cm范围内变异系数较大, 80~100 cm范围内, 土壤总盐和各离子变异系数相对较小; 盐分表聚现象严重; 该地区盐土类型主要是硫酸盐型, 其中SO42-和Na++K+为土壤可溶性盐的主要成分。研究区地下水呈弱碱性, 除HCO3-外, 其他离子和矿化度表现出较强的变异性; 地下水的化学类型主要为Cl·SO4-Na, 矿化度和Cl-、SO42-、Na++K+相关系数较为显著。种植人工碳汇林后, 除土壤HCO3-含量有轻微上升外, 其他离子均有所下降, 其中SO42-含量的降低趋势最为明显。俄罗斯杨林分土壤含盐量随种植年限的增长明显降低, 种植后的土壤盐渍化状况有明显改善。 相似文献
3.
《Communications in Soil Science and Plant Analysis》2012,43(16):1975-1985
ABSTRACTSalt-affected soils expand around the world and become a critical handicap for high crop yield. Saline-sodic soil contributed a major portion in salt-affected soils. Such types of soils have a sizable amount of Na+ in nutrient medium and that reduce the K+ uptake in plants. A hydroponic experiment was performed to investigate the ameliorative effect of different doses of potassium fertilizer (K1 = 0.3, K2 = 0.6 and K3 = 1.2 mM L?1) on rice (Oryza sativa L.) under different ECw (6 dS m?1) and SARw [12 and 24 (mmol L?1)1/2] levels. Application of K+ at elevated levels under saline-sodic conditions improved the concentration of anti-oxidant enzymes, plant physiological, and biochemical attributes by improving the K+: Na+ ratio in plant tissues. Total phenolic content, total soluble protein, and soluble sugar content of rice plant were increased with an increase in potassium dose and saline-sodicity. Maximum K+: Na+ ratios, 4.13 and 2.0 were observed in shoot and root, respectively upon application of K+ at 1.2 mM L?1 in a solution having ECw: SARw level of 6: 12. This study suggested that application of potassium at elevated levels (1.2 mM L?1) has enhanced the rice growth by reducing the harmful effect of Na+ salts on plant physiology, biochemical attributes, and anti-oxidant enzymes under specific saline-sodic conditions. 相似文献
4.
新疆伊犁察南灌区土壤盐分特征 总被引：2，自引：0，他引：2
以察南灌区土壤为研究对象,对不同含盐量土壤进行盐化程度分级,并对该地区土壤盐分特征进行相关分析和主成分分析,以及对土壤盐分因子区域影响因素进行探讨。结果表明:察南灌区以碱性土壤为主,HCO_3~–是影响该灌区土壤p H最强的因子;对灌区0~100 cm土体土壤的分析表明,灌区盐化土面积约为总灌溉面积的1/4,盐渍化风险较大;相关性分析显示,HCO–3、Cl~–、SO_4~(2-)、Ca~(2~+)、Mg~(2~+)、Na~+、K~+为盐分主要组成离子,总盐分与各离子之间均呈正相关关系,与总盐分相关性最强的阴离子为SO_4~(2-),相关性最强的阳离子为Mg~(2~+);主成分分析显示,HCO_3~–、Cl~–、K~+为影响该灌区土壤盐分特征的主导因子;通过盐分因子区域影响因素定性分析可知,除HCO_3~–和pH是由河流以及地下水综合作用影响外,其他盐分因子均主要受河流影响。 相似文献
5.
《Communications in Soil Science and Plant Analysis》2012,43(13-14):1353-1375
Abstract Five representative soils with contrasting physical, chemical, and mineralogical characteristics from the Chaouia and Gharb regions of northwestern Morocco were selected for a study of the effects of wetting and drying cycles (W‐D), temperature, amount of K+ added, and extracting solution on the determination of K‐fixation. With drying at 40°C and the use of of 0.2 M CaCl2 for K+ extractions, the measured amount of K+ fixed increased with increased number of W‐D cycles when high quantities of K were added. The drying, however, caused release of K+ when no or small amounts of K+ were added even for soils not containing mica (illite). With 2 W‐D cycles, measured K+ fixation decreased with increasing drying temperature from 40oC to 100oC regardless of the extracting solution when the calculated fixation was based on the initial extractable K+ rather than the quantity extracted from the zero treatment after wetting and drying. Also, significant differences in K+ fixation existed between extracting solutions at any given temperature. Because of the different drying temperatures and extracting salts used it is difficult to compare results of K+ fixation reported in different studies. Frequent changes in temperature and soil water content during the growing season in Mediterranean climates may have an important influence on K+ availability. 相似文献
6.
Interactions of NaCl and Na2SO4 on soil organic C mineralization after addition of maize straws 总被引：1，自引：0，他引：1
NaCl and Na2SO4 often dominate salt compositions in saline soils. While either salt alone affects soil organic matter mineralization, their interactions on soil organic matter dynamics are unknown. This study aimed to investigate interactive effects of the two salts on organic C mineralization and microbial biomass C of the saline soils after addition of maize straws. Both NaCl and Na2SO4 were applied at 0, 40 and 80 mmol Na kg−1 soil and the incubation was undertaken at soil water content of 15% and 20% (w/w) in dark at 28.5 °C for 70 days. The study found significant interactions of NaCl and Na2SO4 on CO2-C evolution during the early incubation periods—a suppressing effect at days 1-2 but a stimulating effect at days 6-8 and 17-20, and thereafter the salt interactions were influenced by water content. The interactions of water content with NaCl or Na2SO4 on CO2-C evolution were observed through the incubation periods except days 1-2, showing that the salt effects were dependent on water content. Total CO2 evolution over the 70-day-long incubation decreased with increasing NaCl but increased with increasing Na2SO4 compared to the nil-salted treatment. Salt interactions on soil microbial biomass C were observed at days 7, 21, but not at day 49. Microbial biomass C increased at day 7 in the soils treated with either NaCl or Na2SO4 but decreased where the two salts were combined. At day 21, microbial biomass C increased with NaCl but decreased with Na2SO4 regardless whether the counterpart salt was added. The results suggest that soil organic C mineralization can be affected by the interactions of NaCl and Na2SO4, possibly through the salt-induced changes in microbial biomass community structure. 相似文献
7.
Lambert Wiklander 《Geoderma》1975,14(2):93-105
Theory and experimental results have shown that neutral salts in the precipitation or supplied to the ground by other means reduce the acidification of soils by acid precipitation. This salt effect is caused by the cation exchange occurring after the entry of the rain water into the soil.The acid components of precipitation consist of H2SO4, HNO3 and HCl and of NH4+ after nitrification in the soil. The magnitude of the salt effect depends on the relative bonding energy of H3O+ and of Ca2+, Mg2+, Na+, K+, NH4+ in the soil as well as on the concentrations of H3O+ and the above cations in the precipitation. The salt effect may be considerable in very acid soils. It decreases with rising pH to become very small or negligible in neutral soils, chiefly due to the increasing bonding energy of H3O+ in this direction.The adverse effect of acid precipitation, therefore, is likely to be less in very acid soils, such as podsols, than in slightly acid and neutral soils with low buffering capacity against pH change. Soil texture and calcite content are very important factors in this respect as fine material and calcite increase the buffering. 相似文献
8.
Lamers Leon P.M. Van Roozendaal Silvia M.E. Roelofs Jan G.M. 《Water, air, and soil pollution》1998,105(1-2):95-106
In recent decades, SO4 2- concentrations have increased in groundwater and surface water of freshwater wetlands. For many minerotrophic peatlands, S originating from SO4 2--polluted groundwater and surface water is a more significant source of SO4 2- than the actual atmospheric deposition of S compounds. Lowered groundwater tables in wetlands, as a result of either natural or anthropogenic desiccation, may cause acidification because of concomitant geochemical oxidation processes. The impact of the enhanced availability of reduced S compounds, due to preceding SO4 2- pollution, on these processes was tested in a mesocosm experiment, using soil cores including vegetation from a mesotrophic wet meadow. The soils had been maintained in waterlogged condition for seven months, using two environmentally relevant SO4 2- concentrations (2 and 4 mmol L-1). The groundwater table was reduced in two successive steps: 10 cm below soil surface, and complete desiccation. Control pretreated soils did not show a decrease in soil pH during desiccation, due to adequate buffering by bicarbonate. However, both SO4 2--pretreated groups showed a significant drop in pH (from 6.5 to 4.5) caused by additional sulfide oxidation, leading to high SO4 2- concentrations (10 and 16 mmol L-1, respectively). Cation exchange and acidification-related solubilization processes induced the mobiliztation of base cations and potentially phytotoxic metals like Al. Nutrient concentrations in soil moisture were influenced strongly by SO4 2- pretreatment, showing distinct patterns for P, N and K. Therefore, S polluted groundwater and surface water may severely increase the sensitivity of wetlands to desiccation. The results are discussed in relation to wetland management. 相似文献
9.
Although there are a variety of ions occurring in the soil throughout most of North America, the majority of halophyte literature focuses on the effects of NaCl on plants. In this study, a comparison is made of the effects of NaCl, KC1, Na2SO4, and K2SO4, on growth of the halophyte Atriplex prostrata Boucher ex DC (SYN: A. triangularis Willd.) at 0, ‐0.75, ‐1.00, and ‐1.50 MPa. Plant survival, height, number of leaves, nodes, and branches were recorded weekly. Photosynthesis was measured once before plants were harvested and dry mass was determined after one month. Content of Na+, K+,‐Mg2+, and Cl‐ in plant tissue was also measured. A general trend observed was that all plant growth parameters decreased with a lowering of the medium osmotic potential, and that K+ salts were more inhibitory than Na+ salts. Ion content of plant tissue generally increased with a lowering of osmotic potential. Our data indicated that K+, a plant macronutrient, was more inhibitory to plant growth than Na+. It is possible that halophytes such as Atriplex prostrata could use Na+ as an osmoticum to adjust the vacuolar water potential, but were unable to use K+ for this function because of a specific ion toxicity. The inhibitory effect of salt on plant growth parameters and survival follow the pattern; K2SO4 >KCl>Na2SO4=NaCl. 相似文献
10.
溶质类型与矿化度对半干旱盐渍化地区果园土壤水分有效性的影响 总被引：3，自引：0，他引：3
盐渍化土壤水分有效性是制约土地生产能力的关键因素之一。研究不同盐分类型及矿化度的盐溶液对土壤水分有效性的影响, 可为微咸水合理灌溉以及促进土壤生产潜力的发挥提供科学依据。本研究采用离心法在室内研究了脱水过程中灌溉水的溶质类型(NaCl和Na2SO4)与矿化度(0、1 g·L-1、3 g·L-1、5 g·L-1、10 g·L-1)对半干旱盐渍化地区果园土壤水分有效性的影响。结果表明: 不同矿化度的NaCl和Na2SO4处理均可使田间持水量、暂时萎蔫系数、永久萎蔫系数、迟效水和无效水较对照有所降低。不同矿化度的NaCl处理以及1 g·L-1的Na2SO4处理土壤全有效水和速效水都较对照增加, 3 g·L-1、5 g·L-1和10 g·L-1的Na2SO4处理土壤全有效水和速效水都较对照减小。不同矿化度的NaCl和Na2SO4处理均可使土壤通气孔隙和毛管孔隙相对减少, 非活性孔隙增大, 其中矿化度为5 g·L-1的NaCl和Na2SO4处理对其影响最为明显, 通气孔隙分别较对照减小16.8%和14.8%, 毛管孔隙分别较对照减小5.2%和6.5%, 非活性孔隙分别较对照增加15.7%和14.4%。NaCl对于土壤比水容量和毛管断裂的延迟效果比NaSO4明显。且土壤溶液盐分含量增加, 土壤持水能力下降、供水性能增加而土壤抗旱性降低。 相似文献
11.
内蒙古河套灌区灌排水离子组成及淋洗盐分用水量评价 总被引：3，自引：0，他引：3
以河套灌区“盐分去向”为研究背景, 通过调查灌区土壤及各级灌排渠系水阳离子含量变化及室内模拟灌溉水淋洗土柱试验, 分析灌溉水经过土壤到排水阳离子组成的变化规律, 探讨用Na+浓度评价淋盐排灌水量比的可行性。结果表明, 与灌溉水相比, 各级排水干渠排水所含盐分中Na+所占比例明显增加, 平均约为87%; Ca2+所占比例减少, 平均约为7%。排水的全盐浓度(EC)和Na+浓度有显著相关关系, 说明Na+浓度对排水的全盐浓度有显著影响。灌溉水的2/3 Ca2+以非水溶性钙盐积聚在土壤, 排出量较少, 但灌区全年的Na+收支基本平衡。淋盐排灌水量比评价分析结果表明, 用Na+浓度评价淋盐排灌水量比要优于用全盐浓度(EC); 要维持灌区Na+收支平衡, 排灌水量比应保持在0.12~0.15, 针对现有灌区年引水量50 亿t, 年排水量要达到6~7 亿t。 相似文献
12.
The potential for sulfate retention is an important soil feature for buffering of atmospheric acid deposition. We studied the effects of increasing additions of different neutral salts and acids on mobilization and retention of SO4 2- in acid forest soils. Soils containing up to 11 mmol SO4 2- kg-1 were equilibrated with H2O, NaCl, MgCl2, and HCl. Release of SO4 2- was highest with H2O and NaCl additions and lowest when HCl was used. Increasing the ionic strength of the added solutions caused decreasing SO4 2- concentrations in equilibrium solution. Decreasing pH in equilibrium solution was found to be the reason for the decrease in release. Even when the pH was < 4, the SO4 2- release decreased. We assume that this finding resulted from the fact that in the soils studied the SO4 2- sorption was controlled by the high contents of Fe oxides/hydroxides. Experiments with Na2SO4, MgSO4, and H2SO4 demonstrated that the B horizons already containing high amounts of SO4 2- were still able to retain SO4 2-. Sulfate retention increased in the order Na2SO4 < MgSO4 < H2SO4, which corresponds to increasing H+ availability. The higher SO4 2- retention along with MgSO4 compared to Na2SO4 may be caused by higher potential of Mg to mobilize soil acidity compared to Na. 相似文献
13.
设施土壤盐分的累积、迁移及离子组成变化特征 总被引：32，自引：1，他引：32
通过对我国不同地区设施栽培现状的野外调查和取样分析,研究了设施栽培条件下土壤盐分的累积、迁移及离子组成变化特点。结果表明:1)设施栽培条件下,土壤含盐量的变化幅度大,且均明显高于露地土壤,各研究区域内已有40%8～9%的土壤含盐量超过了作物正常生长的临界浓度。2)设施栽培的可持续利用周期较短,连续种植到4年左右的设施土壤,其耕层盐分的累积量可达到作物的生长障碍临界点,之后因设施使用率的下降以及采取的措施而有所降低,但仍高于露地土壤。设施连续使用会导致土壤环境质量的不断恶化。3)设施土壤剖面(0100.cm)盐分含量均高于相邻露地,盐分含量随土层深度增加而降低,其中耕层(020.cm)的盐分含量显著高于其下各层;盐分离子在土壤剖面的运移同时存在着明显的向底层迁移和向表层聚集两种方式,但以表聚为主;此外,盐分离子的大量累积和向底层迁移,特别是NO3-的淋溶已严重影响到部分地区的地下水水质。4)设施栽培后,土壤中的NO3-、SO42-、Cl-、Ca2+、Mg2+、K+、Na+均有不同程度的累积,阴离子以NO3-和SO42-为主,阳离子以Ca2+为主。盐分的大量累积以及某些离子的相对富集在一定程度上引起了作物养分的供需失衡、土壤酸化、棚室内CO2供应不足等生产问题。 相似文献
14.
内蒙古腰坝绿洲的土壤盐渍化特征 总被引：2，自引：0，他引：2
[目的]研究内蒙古阿拉善左旗腰坝绿洲土壤盐渍化特征及土壤盐分离子分布规律,为研究区农业生产发展及生态环境保护计策提出合理依据。[方法]通过在野外考察、GPS定点、样品采集和处理并借助Excel和SPSS软件,运用统计学方法研究了该区土壤盐离子含量、总碱度与土壤离子含量之间的关系、土壤含盐量以及盐离子间的相关性。[结果]灌区土壤pH值平均值为8.13,为碱性土,土壤盐分含量较高,其中0—10cm土壤盐离子含量最高,平均值达到4.49%。阳离子主要是Ca2+和K++Na+,阴离子主要是SO2-4Cl-HCO-3,CO2-3含量微小。0—10cm土层和10—60cm土层中SO2-4与Ca2+均有极显著正相关,相关性均大于0.95,因子分析中SO2-4与Ca2+,Cl-和K++Na+发生"聚类"现象。[结论]灌区盐渍化土主要为硫酸盐渍土,其次为氯化盐渍土,该盐渍土危害植被生长。 相似文献
15.
华南红壤的交换性碱和交换性酸 总被引：2，自引：2，他引：2
本文提出了一个同时测定土壤的交换性酸和交换性碱的简易方法。将土壤的交换性酸和交换性碱区分为:Na-交换性酸、Ba-交换性酸和SO4-交换性碱、F-交换性碱。用推荐的方法,在野外对华南地区由不同母质发育的砖红壤、赤红壤、红壤等10个剖面进行了测定。结果表明,红壤类土壤含有相当量的交换性碱,但其数量比交换性酸少。酸性母质发育的土壤的交换性酸和交换性碱量大于由基性岩发育的土壤者。红壤的交换性酸和碱的量随电性盐浓度的增高而增大,浓度大于0.1N后,数量基本不变。 相似文献
16.
The study aimed at evaluating whether salt-induced mobilization of acidity may be modified by the type of anion. For this purpose, the effects of different neutral salts on the solution composition of acid soils were investigated. The results were compared with those of the addition of acids. Two topsoil (E and A) and two subsoil horizons (Bs and Bw) were treated with NaCl, Na2SO4, MgCl2, MgSO4, HCl, and H2SO4 at concentrations ranging from 0 to 10 mmol dm?3. With increasing inputs of Cl? the pH of the equilibrium soil solution dropped, the concentrations of Al and Ca increased, and the molar Ca/(Al3+ + AlOH2+ + Al(OH)2+) ratios decreased. These effects were the least pronounced when NaCl was added and the most at the HCl treatments. According to the release of acidity, the topsoils were more sensitive for salt-induced soil solution acidification whereas on base of the molar Ca/(Al3+ + AlOH2+ + Al(OH)2+) ratios, the salt effect seems to be more important for the subsoils. Addition of S042? salts and H2SO4 induced higher pH and lower Al concentrations than the corresponding Cl? treatments due to the SO42? sorption, especially in the subsoils. The Ca/(Al3+ + AlOH2+ + Al(OH)2+) ratios were higher than those of the corresponding Cl? treatments. In subsoils even after H2SO4 additions these ratios were not higher than those of the NaCl treatments. The results indicate (I) that speculation about the effects of episodic salt concentrations enhancement on soil solution acidification not only need to consider the ionic strength and the cation type but also the anion type, (II) that salt-induced soil solution composition may be more crucial in subsoils than in topsoils, and (III) that in acid soils ongoing input of HNO3 due to the precipitation load may induce an even more acidic soil solution than the inputs of H2SO4 of the last decade. 相似文献
17.
几种一年生盐生植物的吸盐能力 总被引：7，自引：1，他引：7
【目的】土壤盐渍化在新疆发生面积多,分布广,利用盐生植物对盐分的超富集能力,选育生物量大且体内盐分浓度高的品种,可有效改良盐碱地。本试验比较了几种主要盐生植物的吸收离子类型和盐分积累量,为科学合理利用盐生植物进行盐碱地改良提供科学依据。【方法】选取一年生盐角草(Salicornia europaea)、盐地碱蓬(Suaeda salsa)、高碱蓬(Suaeda altissima)和野榆钱菠菜(Atripex aucheri Moq.)为材料进行人工种植,试验地土壤为壤土和砂壤土,耕层土壤盐分均值为10.23 g/kg,p H为8.36,属于中度盐化土壤。采用完全随机排列设计,在生育早期、中期和末期采样测定植物地上、地下部分干物质量和K+、Na+、Ca2+、Mg2+、Cl-、SO2-4浓度。【结果】生育末期四种盐生植物地上生物量均占整株生物量的89%以上,高碱蓬(23302 kg/hm2)蓬野榆钱菠菜(20379 kg/hm2)盐地碱蓬(18670 kg/hm2)盐角草(9096 kg/hm2)。盐分总浓度盐角草(215 g/kg)盐地碱蓬(152 g/kg)高碱蓬(137 g/kg)野榆钱菠菜(103 g/kg)。不同植物离子含量不同,K+浓度以高碱蓬中最高,Na+、Cl-、SO2-4在盐角草中最高,Ca2+、Mg2+浓度在盐地碱蓬中最高;4种盐生植物对Na+、Cl-、SO2-4的吸收能力极强,按阴离子类型划分盐角草属于SO2-4-Cl-型盐生植物,盐地碱蓬、高碱蓬、野榆钱菠菜属于Cl--SO2-4型盐生植物;盐分积累量为高碱蓬(3499 kg/hm2)盐地碱蓬(3061 kg/hm2)蓬野榆钱菠菜(2180 kg/hm2)盐角草(2080 kg/hm2)。【结论】盐生植物对土壤的改良效果主要以生育末期刈割时单位面积从土壤中吸收的盐分总量来衡量,这取决于此时地上部分生物量与植株体内盐分浓度的大小。植物会根据其生长需求选择吸收土壤中矿物质元素,盐角草对的Na+、Cl-的吸收能力强于盐地碱蓬、高碱蓬和野榆钱菠菜,尤其对Cl-表现出极强的选择吸收能力。 相似文献
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[目的]了解胶州湾滨海湿地土壤盐渍化特征,为胶州湾滨海湿地保护和区域土壤盐渍化防治提供科学依据。[方法]在胶州湾选取芦苇、碱蓬、光滩及大米草4种典型滨海湿地分层采集土壤样品,通过测定土壤pH值、电导率和主要盐离子浓度开展研究。[结果]胶州湾滨海湿地土壤盐分含量表现由低到高依次为:芦苇湿地碱蓬湿地光滩湿地大米草湿地,盐渍化类型呈现由滨海硫酸盐—氯化物型向氯化物盐渍化土类型过渡的特征;垂直方向上,大米草湿地和芦苇湿地具有表层积盐特征,碱蓬和光滩湿地则呈现出下层稍高趋势。除CO_3~(2-)(和HCO_3~-离子以外,胶州湾滨海湿地土壤主要盐离子含量均呈现出与全盐量、电导率一致的规律,主要盐离子浓度从高到低依次为:Cl~-Na~++K~+SO_4~(2-)Mg~(2+)HCO_3~-Ca~(2+)。[结论]胶州湾滨海湿地土壤属于极重度盐化土,呈现自芦苇湿地向大米草湿地方向递增趋势;土壤碱度上属非碱化土,与土壤含盐量呈相反趋势,但植被易受苏打碱化土的潜在毒害作用。 相似文献
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调查研究了甘肃景电灌区盐化土壤的吸湿系数和凋萎湿度及其与土壤全盐、电导率和物理性粘粒含量的关系。结果表明盐分对土壤吸湿系数具有显著影响 ,盐土的吸湿系数可达 1 7 93%～ 38 30 % (重量含水量 )。随着土壤全盐量的降低 ,物理性粘粒含量对吸湿系数的影响逐渐增大。盐分组成对盐土和盐化土壤的吸湿性影响很大 ,氯离子 >钠离子 >镁离子≥钙离子 >硫酸根离子。盐分对土壤凋萎湿度的影响也达极显著水平 ,但凋萎湿度不如吸湿系数对盐分敏感。盐分离子组成对凋萎湿度的影响与其对吸湿系数的影响相似 ,氯离子>钠离子 >硫酸根离子 >镁离子 >钙离子。根据凋萎湿度与吸湿系数之间的关系以及凋萎湿度与物理性粘粒含量、全盐和电导率之间的关系 ,本文提出了预报盐化土壤凋萎湿度的三种模型 ,经检验获得了较为理想的结果 相似文献