淋溶条件下茶树修剪叶对土壤的酸化作用  

Soil Acidification Induced by Pruned Tea Leaves under Water Leaching Conditions

作　　者：杨平平[1,2] 徐仁扣[2] 黎星辉[1] 

机构地区：[1]南京农业大学茶叶科学研究所,南京210009 [2]中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,南京210008

出　　处：《安徽农学通报》2013年第11期7-10,21,共5页Anhui Agricultural Science Bulletin

基　　金：国家自然科学基金(30872009)资助

摘　　要：通过土柱间歇淋洗实验,研究了添加茶树修剪叶对不同土壤的酸度及盐基离子迁移、淋出的影响。在24周的淋溶实验内,添加茶树修剪叶的荒地土各土层由表及里pH比对照分别下降了1.16、1.03、0.85,茶园土分别下降了0.58、0.12、0.02。添加茶树修剪叶还促进了土壤盐基离子的淋失,茶树修剪叶对荒地土壤中盐基阳离子淋失的加速作用大于其对茶园土的。淋溶实验结束时,荒地土盐基离子含量低于对照。由于淋溶实验期间茶树修剪叶也会向土壤中补充部分盐基阳离子,因此淋溶实验结束时,茶园土中Ca2+和K+的含量略高于对照。茶树修剪叶对不同盐基离子淋失的促进作用有所不同,对Ca2+、Mg2+淋失的促进作用大于对K+、Na+淋失的促进作用。Two yellow brown soils were chosen to investigate the effect of pruned tea leaves on soil acidification and migration of base cations with leaching experiments.The results indicated that incorporation of pruned tea leaves accelerated soil acidification and leaching losses of base cations from the soils, even though base cations were returned back by leaves.After 24 weeks＇ intermittent leaching, soil pH of surface, subsurface and bottom layers of the unused land was decreased by 1.16, 1.03,0.85 units and correspondingly,the pH of the soil from tea garden was decreased by 0.58,0.12,0.02 units, respectively.At the end of leaching experiments,the contents of base cations in the soil from unused land with pruned tea leaves incorporated were lower than these for control without pruned tea leaves added.While an opposite trend was observed for Ca^2＋ and K^＋ in the soil from tea garden due to the cations returned back from tea leaves.Leaching loss of calcium and magnesium accelerated by pruned tea leaves was greater than potassium and sodium from both soils.

关 键 词：茶树修剪叶 土壤酸化 盐基阳离子 土壤PH 

分 类 号：S153[农业科学—土壤学]