Effects of litter incorporation and nitrogen fertilization on the contents of extractable aluminium in the-rhizosphere soil of tea plant (Camallia sinensis (L.) O. Kuntze)

文献类型： 外文期刊

第一作者： Ruan, JY

作者： Ruan, JY;Ma, LF;Shi, YZ;Zhang, FS

作者机构：

关键词： exchangeable cations;extractable Al;N fertilization;organic residues;soil chemistry;tea

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

ISSN： 0032-079X

年卷期： 2004 年 263 卷 1-2 期

页码：

收录情况： SCI

摘要： The effects of litter incorporation band nitrogen application on the properties of rhizosphere and bulk soils of tea plants (Camellia sinensis (L.) O. Kuntze) were examined in a pot experiment. Total of 8 treatments included four levels of tea litter additions at 0, 4.9, 9.8, and 24.5 g kg(-1) in combination with two N levels (154.6 mg kg(-1) and without). After 18 months of growth the rhizosphere soil was collected by removing the soil adhering to plant roots and other soil was referred to as bulk soil. The dry matter productions of tea plants were significantly increased by N fertilization and litter incorporation. The effect of litter was time-depending and significantly decreased the content of exchangeable Al (Al-ex, by 1 mol L-1 KCl) and Al saturation at 9, months after litter incorporation whereas soil pH was not affected, although the litter contained high Al content. After 18 months, the contents of extractable Al by dilute CaCl2, CUCl2 + KCl, NH(4)OAC, ammonium oxalate and sodium citrate (Al-CaCl2, Al-Cu/KCl, Al-NH4OAC, Al-Oxal, and Al-Cit respectively) and Al-ex, were not affected by litter application, except that of Al-CaCl2 in the rhizosphere soil which-was decreased following litter additions. Nitrogen fertilization with NH4+ (urea and (NH4)(2)SO4) significantly reduced soil pH, the contents of exchangeable Ca, K, Mg and base saturation while raised extractable Al levels (Al-CaCl2, Al-Cu/KCl, Al-NH4OAC, and Al-ex). In the rhizosphere soils exchangeable K accumulated in all treatments while exchangeable Ca and Mg depleted in treatments without litter application. The depletions of Ca and Mg were no longer observed following litter incorporation. This change of distribution gradients in rhizosphere was possibly due to the increase of nutrient supplies from litter decomposition and/or preferable root growth in soil microsites rich, in organic matter. Lower pH and higher extractable Al (Al-CaCl2, Al-ex, and Al-NH4OAC) in the rhizosphere soils, regardless of N and litter treatments, were distinct and consistent in all treatments. Such enrichments of extractable Al in the rhizosphere soil might be of importance for tea plants capable of taking up large amounts of Al.

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