磷、镁、钙、硅对降低铝毒及促进银杏生长的效应研究-植物营养学专业论文.docxVIP

磷、镁、钙、硅对降低铝毒及促进银杏生长的效应研究摘要 磷、镁、钙、硅对降低铝毒及促进银杏生长的效应研究 摘要 本试验采用“416-C”最优混合设计，研究磷、镁、钙、硅降低铝毒及促进银 杏生长的效应，结果表明： 1．在本试验条件下，施用磷可提高土壤pH值，降低土壤交换性铝含量，减少银 杏对铝的吸收，降低铝的毒害。艟量的磷可促进银杏生长，而磷过量时，会影响其 它元素的吸收而引起营养失去平衡，银杏生长量下降。／之陟—～ ／ 2．氯化镁使土壤pH值降低，土壤交换性铝提高，但镁通过拮抗作用使银杏的含 、‘；i!!， 铝量下降而缓解铝毒害。遣量的施用镁可促进银杏生长，而镁过量时，会影响其它 元素的吸收而引起营养失去平衡，银杏生长量下降。L夕～～ ／ 3．氯化钙使土壤pH值降低，土壤交换性铝提高，但钙通过拮抗作用使银杏的含铝 =!!!!，=一 量下降而缓解铝毒害审危量的施用钙可促进银杏生长，而钙过量时，会影响其它元素～#!__；蜒’ 的吸收而引起营养失去平衡，银杏生长量下降。I夕一、～一 4．在本试验条件下，硅可提高土壤pH值，降低土壤交换性铝，通过降低土壤铝活 性，使银杏的含铝量下降而缓解铝毒害。／同时硅作为植物有益元素，可促进银杏生长。L卫一 ＼ ／ 5．在本试验条件下，硅、磷互作可提高土壤pH值，降低土壤交换性铝含量，减少 银杏对铝的吸收，降低银杏根茎叶的铝含量。／硅、磷互作对银杏铝含量具有正的连应 、 ? 效果．促进银杏生长。_)L户、～．。 6．在本试验条件下， 磷、钙互作对银杏鲜重增长量在低浓度时具有正连应效果， ／ l 高浓度则显出负连应效果口传丐、硅互作对银杏鲜重增长量具有一定的正连应效果。L虹一 L ／ ， 7．在施用氯化钙和氯化镁的条件下，获得最佳旋肥方案9触1 33(0．627 g kg“)、 。‘’一L 、 镁0．53(0．194 g．k91)、钙o．1 3(0．3249．kg‘1)、硅1．75(0．553 g kg。1)。l夕一～ ／ ∥7 关键词：目$r镁—百r—两铝毒}银杏。 STUDY STUDY ON DETOXlC ALUMlNIUM AND PROMOTl0N OF GINKGO GROWTH BY PHOSPHORUS，MAGNESI UM，CALCI UM AND SI LICON ABSTRACT ‘416-C’’optimal regression design WaS used to study on detoxic aluminium and promotion of Ginkgo growth by P,Mg，Ca and Si．The results were showed as follows： 1．In this study，the application of P could increased the soil pH value and decreased the content of soil exchangeabled AI．It also could decrease the absorption of AI and reduce A1 toxicity．Appropriate amount of P application could promote the growth of Ginkgo，while excessive amount of P application would influence the absorption of other elements which would make the Ginkgo off the balance of nutrition then decrease the growth ofGinkgo． 2．MgCl2 decreased the soil pH value and increased the content of soil exchangeabled AI，but Mg could reduce the AI content in Ginkgo and then relieve the toxicity of Al by the way of resistant effects．The growth of Ginkgo could be promoted by applied appropriate amount of Mg，but excessive amount of Mg application would influence the absorption of other elements which would make the Ginkgo off the balance of nutrition