摘要
为探明不同烟气脱硫石膏施用量对滨海农耕土壤中的全磷、有效磷、无机磷组分等的影响,通过田间试验的方式,分别在试验区土壤中施加0t/hm^2、15t/hm^2、30t/hm^2、45t/hm^2烟气脱硫石膏。研究结果表明:与对照组相比,各处理组的土壤全磷含量无显著差异,而土壤中的有效磷和渗滤液中的可溶性磷含量则随着烟气脱硫石膏施入量的增加而降低;施入烟气脱硫石膏后农耕土壤中无机磷含量显著增加,其中又以磷酸钙盐含量的增加为主,磷酸钙盐中的Ca2-P、Ca_8-P和Ca_10-P含量分别增加了30.8%—68.9%、35.2%—66.3%和7.3%—17.8%。烟气脱硫石膏的施用促进了植物的生长发育,有效磷的降低和无机磷组分中磷酸钙盐的增加并未影响到植物对磷素的吸收。因此,烟气脱硫石膏能有效地固定滨海农耕土壤中的溶解态磷,控制土壤过量磷素向水体迁移,降低附近水体富营养化发生的机率,保障区域水体生态系统环境安全。
To investigate the effect of the flue gas desulfurization gypsum （FGDG） on coastal cultivated soil, a field experiment was conducted to evaluate different application amounts at rates of 0, 15, 30, and 45 t/hm2. The effect of FGDG on soil total phosphorus （P）, available P, and inorganic P fractions in coastal cultivated soils were measured. The results indicated that FGDG had no significant effect on soil total P in the cultivated soils. However, FGDG significantly reduced the soil available P and tile flow water soluble P. The inorganic P content was significantly increased by FGDG, especially calcium phosphorus （Ca8-P）. The mean concentration of Ca8-P in the soil increased by 35.2%-66.3%, and the Ca10-P concentration in the soil was increased by 7.3%-17.8%. The ability of Echinacea to absorb P was not affected by the reduction of available P or increased Ca-P in fractions of inorganic P in the soil. FGDG application promoted plant growth and development. Therefore, FGDG could effectively fix the soil available P, control the excessive P accumulation of soil, and reduce the risk of eutrophication of the surrounding water bodies. The results provide a guideline for a reasonable rate of FGDG application in coastal cultivated soils.
出处
《生态学报》
CAS
CSCD
北大核心
2017年第9期2935-2942,共8页
Acta Ecologica Sinica
基金
国家环保公益性行业科研专项(201109023-2)
上海市科委专项资助项目(15dz1207904)
关键词
烟气脱硫石膏
滨海农耕地
磷
无机磷组分
农业面源污染
flue gas desulfurization gypsum
coastal cultivated soils
phosphorus
fractions of inorganic phosphorus
agricultural non-point source pollution
