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Potential use of biosolids to reforest degraded areas with New Zealand native vegetation

AuthorsGutiérrez-Ginés, María-Jesús; Robinson, Brett H.; Esperschuetz, J.; Madejón, Engracia ; Horswell, Jacqui; McLenaghen, Roger
Dehydrogenase activity
Issue Date27-Jul-2017
PublisherAmerican Society of Agronomy
CitationJournal of environmental quality 46(4): 906-914 (2017)
AbstractBiosolids could potentially be used for reforestation of degraded soils in New Zealand with native vegetation. Many native plant species of New Zealand thrive in low-fertility soils, and there is scant knowledge about their nutrient requirements. Therefore, it is unclear whether they will respond positively to the addition of biosolids. We used a pot trial to determine the responses of 11 native plant species to biosolids addition (10% w/w, ~90 Mg hm-2) on two distinct degraded soils, Lismore stony silt loam and a Kaikoura sand. We also intended to prove that the soil microbial activity improves with the addition of biosolids, depending on the plant species. All species grew better in Lismore stony silt loam than the Kaikoura sand. All species in the Lismore stony silt loam responded positively to biosolids. The response to biosolids addition in the Kaikoura sand was variable, with four species showing no improvement in growth when biosolids were added. The nutrient status (N, P, S, Cu, and Zn) of all species improved when the two soils were amended with biosolids. However, some plant species, especially Pittosporum tenuifolium Sol. ex Gaertn. and Coprosma robusta Raoul, showed concerning concentrations of Cd (up to 2.4 mg kg-1). Dehydrogenase activity of soils (indicator of soil microbial activity) increased in biosolidsamended soils, with a strong species effect. Future work should involve field trials to determine the effect of biosolids addition on the establishment of native plant communities.
Description9 páginas.-- 4 figuras.-- 4 tablas.-- 50 referencias.-- Supplemental material is available online for this article
Publisher version (URL)http://dx.doi.org/10.2134/jeq2017.04.0139
Appears in Collections:(IRNAS) Artículos
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