EcoBirch soil data

In this research the aim is to better understand how birch restoration, using chronosequences, affects soil processes. For that, we chose 10 study areas in Iceland where we selected three successional stages: non-forested sites (N), young woodlands (Y), and old woodlands (O). We focus on examining the interactions between carbon, soil, pH, soil colloids (determined by oxalate and pyrophosphate extractions), and dust deposition. The study areas were categorized into seven dust categories depending on the dust intensity they receive. We found that soil pH decreases and carbon and metal-organic complexes (MOCs) increases with increasing birch age, whereas allophanic materials do not change. MOCs are associated with carbon accumulation. Dust deposition has a significant effect on soil properties, such as decreasing carbon and colloid contents and increasing soil pH. The higher soil pH appears to decrease the allophanic Al/Si ratio. This study documents the success of woodland restoration for carbon accumulation and the important role of dust in regulating soil processes and properties of Andisols.本研究旨在深入阐明利用演替序列（chronosequence）开展的桦木林修复对土壤过程的影响机制。为此，我们选取冰岛的10个研究区域，并在每个区域内划定三个演替阶段：未造林样地（N）、幼年桦木林（Y）以及成熟桦木林（O）。本研究重点探究碳、土壤、pH值、土壤胶体（通过草酸盐（oxalate）与焦磷酸盐（pyrophosphate）浸提法测定）与粉尘沉降之间的相互作用关系。研究区域依据其所承受的粉尘沉降强度被划分为7个粉尘等级。研究结果表明：随着桦木林林龄的增长，土壤pH值呈下降趋势，而碳与金属有机复合体（MOCs）的含量则显著升高，而水铝英石类物质（allophane）的含量无明显变化。金属有机复合体与碳固存过程密切相关。粉尘沉降对土壤理化性质具有显著影响，可降低碳与胶体含量并提升土壤pH值。较高的土壤pH值似乎会降低水铝英石的铝硅比（Al/Si）。本研究证实了桦木林修复在碳固存方面的成效，并阐明了粉尘在调控土壤过程以及火山灰土（Andisols）理化性质中的重要作用。