Key message

Soil pH, EC, and salinity explain the leaf nutrient concentrations of Prosopis pallida despite the high amount of soil nutrients near the trees.

Abstract

Dryland forests constantly face extreme abiotic conditions, and this affects plant growth and nutrition. We have determined the effects of soil chemical attributes and soil nutrients on the leaf nutrient concentrations of eight Prosopis pallida populations located along a climatic gradient in the North-Peruvian dryland forests. We analyzed the leaf chemical composition (N, P, K, Ca, Mg, Fe, Mn, Cu, and Zn), as well as soil chemical attributes [texture, pH, salinity (electrical conductivity; EC), and the sodium adsorption ratio (SAR)] and soil nutrient concentrations (the same elements as in the leaves) at 2 m from the base of each tree. The soil and leaf nutrient concentrations were not associated with the climatic gradient and were highly variable within populations. Despite the dry conditions, the soil nutrients were not a limiting resource (eutric conditions), and thus the soil chemical attributes were the main driver of the variation in leaf nutrient concentrations. Interestingly, leaf Mn was correlated with soil and leaf nutrients, as well as with soil chemical attributes, suggesting it can be used as an early indicator of plant nutrition.

中文翻译：

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干旱条件下的干旱条件下，土壤中的化学性质决定了拟螺的叶片营养成分。

关键信息

尽管树木附近有大量土壤养分，但土壤的pH值，EC和盐度仍可解释淡水丙子的叶子养分浓度。

抽象

旱地森林不断面临极端的非生物条件，这会影响植物的生长和营养。我们已经确定了土壤化学属性和土壤养分对八种Prosopis pallida叶片养分浓度的影响北秘鲁旱地森林中沿气候梯度分布的种群。我们分析了叶片的化学成分（N，P，K，Ca，Mg，Fe，Mn，Cu和Zn），以及土壤化学特性[质地，pH，盐度（电导率； EC）和钠吸附[SAR]和土壤养分浓度（与叶中的元素相同），距每棵树的底部2 m。土壤和叶片养分浓度与气候梯度无关，在种群内变化很大。尽管干旱条件，土壤养分并不是限制性资源（严寒条件），因此土壤化学特性是叶片养分浓度变化的主要驱动力。有趣的是，叶片锰与土壤和叶片养分以及土壤化学特性相关，