Valuing Supporting Soil Ecosystem Services in Agriculture: a Natural Capital Approach

Brady, Mark and Hedlund, Katarina and Cong, Rong-Gang and Hemerik, Lia and Hotes, Stefan and Machado, Stephen and Mattsson, Lennart and Schulz, Elke and Thomsen, Ingrid K. (2015): Valuing Supporting Soil Ecosystem Services in Agriculture: a Natural Capital Approach. Published in:

Abstract

Soil biodiversity through its delivery of ecosystem functions and attendant supporting ecosystem services—benefits soil organisms generate for farmers—underpins agricultural production. Yet lack of practical methods to value the long-term effects of current farming practices results, inevitably, in short-sighted management decisions. We present a method for valuing changes in supporting soil ecosystem services and associated soil natural capital—the value of the stock of soil organisms—in agriculture, based on resultant changes in future farm income streams. We assume that a relative change in soil organic carbon (SOC) concentration is correlated with changes in soil biodiversity and the generation of supporting ecosystem services. To quantify the effects of changes in supporting services on agricultural productivity, we fitted production functions to data from long-term field experiments in Europe and the USA. The different agricultural treatments at each site resulted in significant changes in SOC concentrations over time. Declines in associated services are shown to reduce both maximum yield and fertilizer-use efficiency in the future. The average depreciation of soil natural capital, for a 1% relative reduction in SOC concentration, was 144 € ha-1 (SD 47 € ha-1) when discounting future values to their current value at 3%; the variation was explained by site specific factors and the current SOC concentration. Moreover, the results show that soil ecosystem services cannot be fully replaced by purchased inputs, they are imperfect substitutes. We anticipate our results will both encourage and make it possible to include the value of soil natural capital in decisions.

• Item Type: MPRA Paper
• Language: English
• Keywords: soil organic carbon; economic valuation; sustainable agriculture; ecological intensification; land use
• Subjects: Q - Agricultural and Natural Resource Economics ; Environmental and Ecological Economics > Q0 - General; Q - Agricultural and Natural Resource Economics ; Environmental and Ecological Economics > Q0 - General > Q00 - General; Q - Agricultural and Natural Resource Economics ; Environmental and Ecological Economics > Q0 - General > Q01 - Sustainable Development; Q - Agricultural and Natural Resource Economics ; Environmental and Ecological Economics > Q0 - General > Q02 - Commodity Markets; Q - Agricultural and Natural Resource Economics ; Environmental and Ecological Economics > Q1 - Agriculture > Q10 - General; Q - Agricultural and Natural Resource Economics ; Environmental and Ecological Economics > Q1 - Agriculture > Q18 - Agricultural Policy ; Food Policy; Q - Agricultural and Natural Resource Economics ; Environmental and Ecological Economics > Q5 - Environmental Economics > Q50 - General; Q - Agricultural and Natural Resource Economics ; Environmental and Ecological Economics > Q5 - Environmental Economics > Q57 - Ecological Economics: Ecosystem Services ; Biodiversity Conservation ; Bioeconomics ; Industrial Ecology

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