Qing Wan Ren-kou Xu Xing-hui Li. Proton release by tea plant (Camellia sinensis L.) roots as affected by nutrient solution concentration and pH. Plant Soil and Environment 2012 58(9): 429-434.
http://www.agriculturejournals.cz-publicFiles-74297.pdf
Abstract: Solution culture experiments were conducted and the protons released were measured with an automatic titration system to determine the main factors affecting proton release by tea roots. Results indicated that the higher were the cation concentrations the more protons being released from the roots suggesting that tea roots took up a large amount of cations during growth and then released protons to maintain charge balance of the plant body. The amount of protons released from tea roots at controlled pH was much higher than that in the treatments with uncontrolled pH. Stepwise multiple linear regression analysis showed that both NH4+ and Al(III) played distinct roles in proton release by tea plant roots. The uptake of Al(III) and NH4+ and subsequent release of protons may be an important mechanism for soil acidification in tea gardens.
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营养液浓度和pH对茶树根系释放质子的影响
万青，徐仁扣，黎星辉
Plant Soil and Environment 2012 58(9): 429-434
http://www.agriculturejournals.cz-publicFiles-74297.pdf
摘要：本文利用自动电位滴定系统测定水培条件下茶树根系的质子释放并分析得出影响其根系分泌质子的主要因素。结果显示，营养液中阳离子浓度越高，茶树根系释放质子越多，表明茶树在生长过程中吸收大量阳离子，为维持体内电荷平衡会通过根系释放质子。恒pH条件下茶树根系的质子释放量显著高于非恒pH条件下的。逐步多元回归分析表明，NH4+和Al(III)对于茶树根系释放质子起主要作用。茶树大量吸收NH4+和Al(III)而引起的质子释放可能是茶园土壤酸化的重要原因。