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Effect of nutrient cycle by different thinning practice in temperate forest

机译：营养循环对温带林中不同稀疏实践的影响

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The plantation thinning and associated managements can influence the functions and structure of forest ecosystems as well as the status and dynamics of soil nutrients and organic matter that affect the forest ecosystem and related environment reciprocally. The objective of this study was to investigate the influences of thinning treatments to soil nutrient cycles and dissolved organic matter. This study was carried out in a 40-year-old Cryptomeria japonica plantation located at central Taiwan. Thinning intensity divided to control, 40% and 60%. Before and after thinning, soil was sampled and analysed for soil properties and dissolved nutrients such as dissolved organic carbon (DOC), cations and anions. The dissolved K~+ of control treatments was significantly higher than that of thinning treatments suggesting that K~+ was leaching down by rainfall after thinning treatment. The nitrate concentration extracted from fresh soil increased with thinning intensity indicating that fresh Utter accumulated in the soil, the litter was decomposed by microbes and protein was released from plant tissue. Organic matter decomposed from litter was also transformed to NO_3", and therefore increased NO_3 concentration. Thinning treatments affected concentrations ofK~+, Fe~3+ Al~(3+), and anions. Although the DOC concentrations showed no significantly difference, it might be complexed with induced with cations such Fe~(3+) and Al~(3+). Nutrients are released from fresh litter decomposition after thinning treatment.Therefore, DOC plays an important role after plantation thinning. The results also can be a reference for nutrient management of plantation.
机译：种植园间伐和相关管理层能够影响的是影响森林生态系统和相互关联的环境功能和森林生态系统的结构，以及土壤养分状况和动态和有机物。这项研究的目的是调查减薄处理土壤养分循环和溶解有机物的影响。这项研究是在40岁的日本柳杉林位于台湾中部进行。变薄强度除以控制，40％和60％。之前和之后的变薄，土壤取样并土壤性质和溶解的营养物，例如溶解的有机碳（DOC），阳离子和阴离子进行分析。溶解的K〜的对照处理+比的变薄处理表明K〜+被减薄处理后浸出向下通过降雨显著更高。从新鲜土壤中提取的硝酸盐浓度与间伐强度指示新鲜奋斗和在土壤中累积的增加，垫料是由微生物分解和蛋白从植物组织释放。从垃圾分解有机物也转化为NO_3" ，因此增加NO_3浓度。影响细化处理浓度OFK〜+，铁〜3 +的Al〜（3+），和阴离子。虽然DOC的浓度没有表现出显著差异，它可能与阳离子引发络合铁等〜（3+）和Al〜（3+），营养物质从新鲜垫料分解细化treatment.Therefore后获释，DOC扮演种植拔后重要的作用，其结果也可以是人工林的养分管理参考。

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