土壤水分对Cd污染土壤蔬菜产量和Cd积累的影响

Effect of moisture content in Cd polluted soil on yield and Cd accumulation of vegetables

取韶关矿区典型Cd污染菜地土壤,采用盆栽试验研究不同田间持水量(40%和80%)对菜心和蕹菜产量及Cd吸收积累的影响,结果表明:提高土壤田间持水量能显著提高土壤p H值和蔬菜产量,降低蔬菜中的Cd含量。在2种Cd水平(土壤Cd含量4.00 mg/kg、8.00 mg/kg)下土壤田间持水量80%的处理比土壤田间持水量40%的处理,菜心分别增产60.0%和101.8%,菜体Cd含量分别降低23.0%和168.4%;蕹菜分别增产148.0%和137.8%,菜体Cd含量分别降低136.4%和214.8%。在2种Cd水平下,蔬菜的Cd含量均与土壤p H值呈极显著负相关。

Some typical Cd-polluted soil in Vegetable cultiVated land of Shaoguan mining area was taken and used for pot trial to study the effects of different field capacities（40% and 80%）on the yield and Cd absorption and accumulation in flower-ing Chinese cabbage（ Brassica rapa Var. chinensis）and water spinach. The results showed that increasing the field capacity of soil could increase pH Value of soil and Vegetable yield,and decrease the Cd content in Vegetables. And increasing the field capacity under 2 Cd leVels,the yield of flowering chinese cabbage increased by 60. 0% and 101. 8%,and the Cd con-tent in its body decreased by 23. 0% and 168. 4% respectiVely;the yield of water spinach increased by 148. 0% and 137. 8% and the Cd content in its body decreased by 136. 4% and214. 8% respectiVely. MoreoVer,the Cd contents in two kinds of Vegetables showed Very significantly negatiVe correlation to the soil pH Value under 2 Cd leVels.