Variation in nutrition along time and relative chlorophyll content of Leucospermum cordifolium cv. 'High Gold', and their relationship with chlorotic sypmptoms
Variation in nutrition along time and relative chlorophyll content of Leucospermum cordifolium cv. 'High Gold', and their relationship with chlorotic sypmptoms
复制标题
DOI：
10.1016/j.scienta.2005.08.009
复制
发表时间：
2006-02-27
影响因子：
4.3
通讯作者：
Borges, AA
中科院分区：
文献类型：
--
作者：
Fernández-Falcón, M;Hernández, M;Borges, AA
叶片样本、SPAD-502测量值（沿生长季节）和土壤样本取自拉帕尔马岛（加那利群岛）6个商业种植园种植的protea植物（Leucospermum cordifolium）的“高金”栽培品种。土壤数据（pH、有效磷、钙、镁、钾、钠和EC）的蛋白质含量在正常范围内，但O.M.较高。排水减少了土壤中粘土含量高可能引起的潜在问题。叶片中N、K、Mg和Na含量较高，Ca和Cu含量正常。另一方面，Fe和Zn的叶面含量较低，而Mn的叶面含量随人工林的不同而波动。春季氮含量较高，钾、钙、镁、钠含量随时间增加而增加。SPAD-502测定结果比较了叶片宏观（N、P、Na、K、Ca、Mg）和微观（Cu、Fe、Mn、Zn）水平的相对叶绿素含量。结果表明，叶片叶绿素含量与氮含量无正相关关系。叶绿素缺乏的叶片氮浓度在一个位点高于叶绿素充足的叶片，在另一个位点反之亦然。叶绿素缺乏叶片中Mn、Fe和Ca浓度较低，而叶绿素充足叶片中Mn、Fe和Ca浓度较高。综上所述，在这一重要的商业品种中，锰、铁和钙的土壤改良可以防止叶绿素缺乏症状的发展，与光合能力下降有关。(c) 2005 Elsevier B.V.版权所有
Foliar samples, SPAD-502 measurements (both along the growing season), and soil samples were taken from protea plants (Leucospermum cordifolium), cultivar 'High Gold' cultivated in six commercial plantations of La Palma Island (Canarian Archipelago). Soil data (pH, available P, Ca, Mg, K and Na, and EC) ranged within normal levels for proteas, though O.M. was high. Drainage decreased the potential problem that could be caused by the high clay content of the soils. Leaves showed high concentrations of N, K, Mg, and Na, while Ca and Cu were normal. On the other hand, Fe and Zn presented some low foliar levels, while Mn values fluctuated depending upon the different plantations. N contents were higher in spring, and those of K, Ca, Mg, and Na increased with time. Relative chlorophyll contents (SPAD-502 measurements) were compared with macro(N, P, Na, K, Ca, Mg) and micro- (Cu, Fe, Mn, Zn) foliar levels. Results showed no positive correlation between leaf chlorophyll and N content. Higher leaf N concentrations were observed in chlorophyll deficient than chlorophyll sufficient leaves at one site and vice versa at another site. In contrast, lower Mn, Fe and Ca concentrations, the last corresponding with higher ratios of N/Ca were observed in chlorophyll deficient than chlorophyll sufficient leaves at several sites. It is concluded that amendment of soils with Mn, Fe and Ca may prevent the development of chlorophyll deficiency symptoms, associated with diminished photosynthetic capacity, in this important commercial cultivar. (c) 2005 Elsevier B.V. All rights reserved.