摘要
通过对民勤绿洲盐生草生境土壤盐分空间分布特征进行研究,旨为其在民勤绿洲乃至全国盐碱地生物修复中的应用提供理论依据。结果表明,在距盐生草水平方向0~60 cm范围内,阴离子主要是SO42-和Cl-,阳离子主要是Na^＋和Ca^2＋,土壤盐分主要是硫酸钠、硫酸钙、氯化钠和氯化钙。其中0~40 cm土层土壤属于氯化物–硫酸盐型,40~60 cm土层土壤属于硫酸盐–氯化物型。土壤pH在垂直剖面上随土层深度的增加而降低,在水平方向上,40 cm处低于20 cm和60 cm处,其中在土壤垂直剖面0~20 cm范围内,20 cm处高于60 cm处;而土壤垂直剖面20~60 cm范围内正好相反。土壤盐渍化程度在垂直方向上随土层的加深而加重,其中在距盐生草水平方向0~40 cm范围内,垂直剖面0~20 cm土层土壤非盐渍化,20~40 cm土层土壤轻度盐渍化,40~60 cm土层土壤中度盐渍化;在距盐生草水平方向40~60 cm范围内,垂直剖面0~40 cm土层土壤非盐渍化,40~60 cm土层土壤轻度盐渍化。在水平方向上,盐生草具有一定的聚盐效果。
Spatial distribution characteristics of soil salinity in habitat soil of Halogeton glomeratus in Minqin Oasis were studied in order to provide a theoretical basis for application of the salt-affected land bioremediation in Minqin Oasis and entire country. The results showed that in the horizontal direction 0 - 60 cm distance from the Halogeton glomeratus, anions component of salts were mainly SO42- and Cl-, cations component of salts were Na＋ and Ca2＋, soil salinity were mainly sodium sulfate, calcium sulfate, sodium chloride and calcium chloride. 0 - 40 cm depth belonged to chloride - sulfate type while 40 - 60 cm depth belonged to sulfate - chloride type. Soil pH decreased with the soil depth increases in the vertical profile. In the horizontal direction, soil pH of the 40 cm distance from plant was less than those of 20 cm and 60 cm distances, and within 0 - 20 cm depth, soil pH of the 20 cm distance from plant was higher than that of 60 cm distance. But soil pH of in 20 - 60 cm depth was just opposite to that in 0 - 20 cm depth. Degree of soil salinization aggravated with soil depth increases, in 0 - 40 cm distance from plant, 0 - 20, 20 - 40 and 40 - 60 cm depths belonged to non-salinization, light salinization and medium salinization, respectively In the horizontal direction 40 - 60 cm distance from the Halogeton glomeratus, 0 - 40 cm depth belonged to non-salinization while 40 - 60 cm depth belonged to light salinization. Halogeton glomeratus has the role of gather salt in the horizontal direction.
出处
《土壤》
CAS
CSCD
北大核心
2014年第4期756-760,共5页
Soils
基金
国家自然科学基金项目(31160118
30960060)
兰州城市学院教学研究项目(2012-JY-40)资助
关键词
盐生草
民勤绿洲
土壤盐分
Halogeton glomeratus, Minqin Oasis, Soil salinity
