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RESEARCH ARTICLE (Open Access)

Spatial variability of soil carbon across a hillslope restoration planting in New Zealand

Molly Katharine D’Ath A , Katarzyna Sila-Nowicka https://orcid.org/0000-0002-1850-1765 A * and Luitgard Schwendenmann https://orcid.org/0000-0002-2290-3003 A
+ Author Affiliations
- Author Affiliations

A School of Environment, The University of Auckland, Private Bag 92019, Auckland, New Zealand.


Handling Editor: Brendan Malone

Soil Research 62, SR24012 https://doi.org/10.1071/SR24012
Submitted: 18 January 2024  Accepted: 31 May 2024  Published: 27 June 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

Context

Forest restoration has been adopted by governments and local communities across the globe to restore ecological functions and as a measure to mitigate climate change.

Aims

This study investigated the spatial variation in landscape, vegetation, soil characteristics, and soil carbon storage under young restoration plantings across a hillslope in northern New Zealand.

Methods

Soil samples (0–10 cm, 10–20 cm, and 20–30 cm) were taken from 121 locations across 5–20-year-old restoration plantings, remnant and regenerating bush and pasture. Samples were analysed for bulk density, pH, and soil carbon concentration and soil carbon stocks were calculated. Ordinary kriging and multiscale geographically weighted regression (MGWR) were used to predict and explain soil carbon stocks across the landscape.

Key results

Soil carbon stocks (0–10 cm depth) across the study area ranged from 1.9 to 7.1 kg m−2. Spatial analysis revealed that elevation, slope, stem density, bulk density, and pH had a significant effect on the magnitude and distribution of soil carbon stocks.

Conclusions and implications

This study has shown that topography had a strong effect on soil carbon stocks across the young restoration plantings. The outcome of this study highlights the importance of taking landscape and soil characteristics into account when planning a forest restoration project.

Keywords: geographically weighted regression, land cover change, landscape, native vegetation, reforestation, soil carbon, spatial analysis, topography.

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