【作者】 苏有健； 廖万有； 王烨军； 张永利； 罗毅；

【Author】 SU Youjian;LIAO Wanyou;WANG Yejun;ZHANG Yongli;LUO Yi;Tea Research Institute of the Academy of Sciences & Agriculture of Anhui Province;

【机构】 安徽省农业科学院茶叶研究所；

【摘要】 以红黄壤为供试土壤,采用室内土柱淋溶模拟试验方法,研究了相当于宣城平均年降水量条件下,钙在茶园土壤垂直方向上的迁移转化特征。结果表明:钙的大多数形态很容易随水分运动发生迁移。随着加入土柱中钙量增加,淋溶液中钙的浓度,在0~20天时间段内均呈下降趋势;在20~40天时间段内,T1、T2、T3均呈急剧上升趋势,淋出液中钙浓度分别达到2156mg/L、2484mg/L、2480mg/L,CK基本维持平衡不变;而在40~50天时间内,T1、T2、T3呈明显下降趋势。钙淋出量T3>T2>T1>CK,而钙淋出率则是T1>T2>T3>CK。最大淋出率在30%左右,而最小的淋出率在10%左右,钙的淋出率有20%受到添加钙浓度的影响。淋溶后,土壤中有效态钙含量相对于原土增加3.5%~25.6%。从整个淋溶过程看,钙的迁移速率约为1.11cm/d。淋溶液中的pH与pCa和pAl的关系分别为,pCa=2.1102pH-4.6636(R2=0.9146 p<0.01)、pAl=2.9263pH-6.9138(R2=0.9138 p<0.01)。外源游离钙的加入量与钙淋出量成正相关关系,与钙淋出率成负相关关系。钙离子对土壤pH的提升作用,随着土层深度的增加而逐渐降低,尤其是在0-5cm层提升作用最为明显。更多还原

【Abstract】 The simulative soil columns in the laboratory were used to research the characteristicsofcalcium movement and migration behavior of calcium forms in uprightness direction in tea garden soils which experienced rainfall of 50 days. Study shows thatit was easy for most of the calcium forms to move following the water movement.With the increase of calcium which input to the soil columns, calcium and aluminum concentration of leaching liquor downward trends in0~20days, showed a sharp upward trends in 20~40days. T1, T2, T3 calcium concentration were up to 2156mg/L, 2484mg/L, 2480mg/L, CKmaintain a balance. T1, T2, T3 calcium concentration were remarkable decline in trends from 40 to 50 days. Cumulative leaching volumes of calcium order was T3>T2>T1>CK, leaching ratio of calcium order was T1>T2>T3>CK, and the loss of calcium is 10%~30%. After leaching, soil available calcium content relative to the original state of the soil increased from 3.5% to 25.6%. From the whole leaching process, migration ratio of calcium was 1.11cm/d approximately. Regression relationship between pH and pAl, pCa were pCa = 2.1102pH- 4.6636(R2 = 0.9146 p<0.01), pAl =2.9263pH- 6.9138( R2 = 0.9138 p<0.01).The addition amount ofexogenous free calcium relationship with calcium leaching out was a positive correlation, with aluminum leaching out was a negative correlation. Calcium enhance the role of soil pHwith the increase of soil depth is gradually reduced, especially in the 0-5cm layer to enhance the role of the most obvious.更多还原