Influence of strip thinning on nutrient outflow concentrations from plantation forested watersheds (original) (raw)

Hydrological Processes, 2015

Abstract

ABSTRACT Nutrient concentrations in stream water, rainfall, throughfall, stem flow, surface flow and ground water were compared before, during, and after strip thinning (intensive 50%) in plantation forested watersheds in Tochigi, Japan. Influences were evaluated comparing four thinning-applied and two reference basins for one year before, six months during and one year after the thinning. Results show that this strip thinning significantly increased DTP, TP and DOC (DTP: 0.01 mg l-1, TP: 0.04 mg l-1, DOC: 0.53 mg l-1) during the thinning period and DTN and TN (DTN: 0.34 mg l-1, TN: 0.46 mg l-1) after the thinning in stream waters relative to the unthinned basins. The increased phosphorus during thinning indicated ground disturbances by the strip thinning, with a concomitant increase in DOC. Changes in biotic and abiotic conditions resulted in increased nitrogen after the thinning, particularly in the dissolved pool. Changes in hydrological processes due to thinning, e.g. a change in flow distributions (less high nutrient stem flow and more low nutrient throughfall) and an increase in water discharge in stream water, possibly weakened the direct influences of thinning on nutrient concentrations. This article is protected by copyright. All rights reserved.

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