Global patterns and drivers of soil total phosphorus concentration
Global patterns and drivers of soil total phosphorus concentration
复制标题
土壤总磷浓度的全球格局和驱动因素
DOI：
10.5194/essd-13-5831-2021
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发表时间：
2021-12-20
影响因子：
11.4
通讯作者：
Hou, Enqing
中科院分区：
文献类型：
--
作者：
He, Xianjin;Augusto, Laurent;Hou, Enqing
土壤是陆地生态系统中最大的磷（P）库。确定土壤磷的量是确定生态系统功能可能受到土壤磷可用性限制的地点的关键的第一步。然而，全球模式和土壤全磷浓度的预测仍然知之甚少。为了解决这一知识差距，我们构建了一个数据库的总磷浓度的5275全球分布（半）自然土壤从761发表的研究。我们量化了13个土壤形成变量在预测土壤全磷浓度方面的相对重要性，然后使用随机森林方法在全球范围内进行了进一步的预测。全球土壤全磷含量在母质类型、土壤目、生物群落和大陆之间存在显著差异，范围为1.4 ~ 9630.0（中位数430.0，平均值570.0）mg kg（-1）。约三分之二（65%）的全球变化是由我们选择的13个变量，其中土壤有机碳浓度，母质，年平均温度和土壤砂粒含量是最重要的。虽然预测的土壤全磷浓度随纬度的增加显着，他们之间的变化很大，由于区域性的母质，地形，和/或气候条件的差异具有相似的纬度地区。据估计，表层土（0-30厘米）和底土（30-100厘米）的土壤磷储量（不包括南极洲）分别为26.8 +/- 3.1（平均值+/-标准差）Pg和62.2 +/- 8.9 Pg（1 Pg = 1x 10（15）g）。我们的全球土壤全磷浓度地图以及土壤全磷浓度的潜在驱动因素可用于约束代表磷循环的地球系统模型，并为全球土壤磷可用性的量化提供信息。本研究中生成的原始数据集和全局地图可在https://doi.org/10.6084/m9.figshare.14583375获得（He et al.，2021年）。
Soil represents the largest phosphorus (P) stock in terrestrial ecosystems. Determining the amount of soil P is a critical first step in identifying sites where ecosystem functioning is potentially limited by soil P availability. However, global patterns and predictors of soil total P concentration remain poorly understood. To address this knowledge gap, we constructed a database of total P concentration of 5275 globally distributed (semi-)natural soils from 761 published studies. We quantified the relative importance of 13 soil-forming variables in predicting soil total P concentration and then made further predictions at the global scale using a random forest approach. Soil total P concentration varied significantly among parent material types, soil orders, biomes, and continents and ranged widely from 1.4 to 9630.0 (median 430.0 and mean 570.0) mg kg(-1) across the globe. About two-thirds (65 %) of the global variation was accounted for by the 13 variables that we selected, among which soil organic carbon concentration, parent material, mean annual temperature, and soil sand content were the most important ones. While predicted soil total P concentrations increased significantly with latitude, they varied largely among regions with similar latitudes due to regional differences in parent material, topography, and/or climate conditions. Soil P stocks (excluding Antarctica) were estimated to be 26.8 +/- 3.1 (mean +/- standard deviation) Pg and 62.2 +/- 8.9 Pg (1 Pg =1 x 10(15) g) in the topsoil (0-30 cm) and subsoil (30-100 cm), respectively. Our global map of soil total P concentration as well as the underlying drivers of soil total P concentration can be used to constraint Earth system models that represent the P cycle and to inform quantification of global soil P availability. Raw datasets and global maps generated in this study are available at https://doi.org/10.6084/m9.figshare.14583375 (He et al., 2021).