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首页> 外文期刊>Agricultural and Forest Meteorology >Effects of waterlogging on water and carbon dioxide fluxes and environmental variables in a Siberian larch forest, 1998-2011
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Effects of waterlogging on water and carbon dioxide fluxes and environmental variables in a Siberian larch forest, 1998-2011

机译：1998-2011年，涝渍对西伯利亚落叶松林中水和二氧化碳通量及环境变量的影响

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摘要

Water vapour and carbon dioxide fluxes, as well as environmental factors, were measured in an Eastern Siberian larch forest for 14 years from 1998 to 2011 to understand the water and carbon balances and the effects of environmental variables on these balances in this region. The overstory vegetation in this forest has been damaged by the unusual waterlogging that has occurred since 2005, and the number of living larch decreased by 15% from 1998 to 2011. During this period, the composition of floor vegetation changed from dense cowberry to grasses and shrubs with high water tolerance. This period was categorized into three phases according to annual precipitation: normal years from 1998 to 2000 and from 2009 to 2011, dry years from 2001 to 2004, and wet years from 2005 to 2008. Although the time series of atmospheric conditions were independent of that of annual precipitation, the behaviour of underground conditions such as soil temperature and soil water content followed the change in annual precipitation. The relationships of the evapotranspiration ratio and surface conductance to soil water content from 2007 were different from those prior to 2006, and the group from 2007 was smaller than that prior to 2006 for both relationships. The relationship between gross primary production and soil water content also changed, but this change occurred in 2008. Specifically, the change in characteristics of evapotranspiration preceded that in carbon dioxide by almost one year. The main driver of the interannual variation in water use efficiency was variation in evapotranspiration until 2007 but was variation in gross primary production since 2008. The time lag of the response of evapotranspiration to increased soil water content was nearly two years, whereas it was about three years in the case of gross primary production. Although drought stresses on forests are well known, this is the first report of water and carbon exchanges in Eastern Siberia indicating that the boreal forest has been damaged by wet stresses at the interannual scale
机译：在1998年至2011年之间的14年中，对西伯利亚东部落叶松林中的水蒸气和二氧化碳通量以及环境因素进行了测量，以了解该地区的水和碳平衡以及环境变量对这些平衡的影响。自2005年以来，该森林的过度植被受到异常涝灾的破坏，活落叶松的数量从1998年到2011年减少了15％。在此期间，地表植被的组成从密实的越橘变为草木和具有高耐水性的灌木。根据年降水量，这一时期分为三个阶段：1998年至2000年以及2009年至2011年是正常年份，2001年至2004年是干旱年份，而2005年至2008年是潮湿年份。尽管大气条件的时间序列与该时间序列无关在年降水量的基础上，地下条件如土壤温度和土壤含水量的行为随年降水量的变化而变化。 2007年以来的蒸散率和地表电导率与土壤水分的关系与2006年之前的关系不同，并且两种关系的2007年以来的值均小于2006年之前的值。初级生产总值与土壤水分之间的关​​系也发生了变化，但这种变化发生在2008年。具体而言，蒸散特征的变化要比二氧化碳的变化快将近一年。水分利用效率年际变化的主要驱动力是直到2007年的蒸散量的变化，但是是2008年以来的初级生产总值的变化。蒸散量对土壤水分增加的响应的时间滞后将近两年，而大约是三年初级生产总值的年数。尽管人们普遍知道干旱对森林的压力，但这是西伯利亚东部水和碳交换的第一份报告，表明北方森林在年际尺度上受到湿应力的破坏。

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