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当前位置: 首页 > 文章 > Effect of forest thinning on hydrologic nitrate exports from a N-saturated plantation 林业研究(英文版) 2020,31 (2)
Position: Home > Articles > Effect of forest thinning on hydrologic nitrate exports from a N-saturated plantation Journal of Forestry Research 2020,31 (2)

Effect of forest thinning on hydrologic nitrate exports from a N-saturated plantation

作  者：
Masaaki Chiwa;Hirokazu Haga;Tamao Kasahara;Masahiro Tateishi;Takami Saito;Hiroaki Kato;Kyoichi Otsuki;Yuichi Ond
单  位：
Department of Plant Ecology, Forestry and Forest Product Research Institute, Forest Research and Management Organization, Tsukuba, Japan; Kyushu University Forest, Kyushu University, Fukuoka, Japan;Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan;Kyushu University Forest, Kyushu University, Fukuoka, Japan;Faculty of Agriculture, Kyoto University, Kyoto, Japan;Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japa;Faculty of Agriculture, Tottori University, Tottori, Japan
关键词：
Thinning;Nitrogen saturation;Nitrogen export;Direct flow;Baseflow;JAPANESE CYPRESS;NITROGEN MINERALIZATION;CRYPTOMERIA-JAPONICA;CHAMAECYPARIS-OBTUSA;HEADWATER CATCHMENT;MANAGEMENT;RUNOFF;FLOW;ECOSYSTEMS;CHEMISTR
摘  要：
Although several studies have assessed the effects of thinning on water quality, including nitrogen (N) exports, few have examined N-saturated plantations. This study assessed the short-term effect of thinning on N exports from a N-saturated plantation forest in northern Kyushu, western Japan, that was thinned (43% of basal area) during January-March 2012. Water levels at the gauging station were continually measured, and stream-water baseflow and stormflow samples were collected before (2011) and after (2013) forest thinning. Annual precipitation before (2469 mm) and after (2418 mm) forest thinning differed little, and annual water discharge after thinning (1641 mm) was similar to that before thinning (1609 mm). However, direct flow during stormflow periods was higher after thinning (260 mm) than before (153 mm). The concentrations of major ions in stream water did not differ before and after thinning. As a result, the high annual dissolved inorganic N (DIN) exports differed little before (35.8 kg N ha(-1) a(-1)) and after (36.5 kg N ha(-1) a(-1)) forest thinning. DIN exports during stormflow periods were slightly higher after (12.2 kg N ha(-1) a(-1)) than before thinning (10.5 kg N ha(-1) a(-1)) and were proportional to the increased direct flow after thinning (561 mm after vs. 470 mm before thinning). We concluded that thinning does not affect annual N exports from the N-saturated plantation forest, but it can increase the proportion of N exported during stormflow periods in proportion to increased water volume of direct flow after thinning.

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