黄土高原森林枯落物储量、厚度分布规律及其影响因素

发布时间：2018-04-26 19:31

本文选题：环境因子 + 线性混合效应模型　；参考：《生态学报》2016年22期

【摘要】：森林枯落物的储量(LM)和厚度(LD)等物理属性,能够表征森林植被的物种多样性以及水源涵养、物质循环等生态功能,然而目前对枯落物储量和厚度分布规律与影响因素的深入探讨较少。以黄土高原为研究区,通过系统取样获得该区主要森林群落枯落物的储量与厚度数据,利用Kruskal-Wallis秩和检验、线性混合效应模型(LME)、普通最小二乘回归等统计方法,分别对不同林型枯落物储量和厚度的差异、储量和厚度的影响因素以及二者之间的关系进行分析。结果表明:1)针叶林与针阔混交林的枯落物储量和厚度差异不显著,但二者都显著大于阔叶林的储量和厚度。2)在纬度方向上,除南部个别点外,枯落物储量和厚度存在单峰格局,如储量在35°—36°N之间存在峰值,而厚度峰值则出现在36°—37°N之间。3)在海拔方向上,储量分布规律并不明显,厚度除了高海拔(3000 m以上)个别点外总体呈现递减格局;LME模型显示,枯落物储量与气温年较差、非生长季降水、总干面积和立木密度呈显著正相关,与乔木层丰富度呈显著负相关,而枯落物厚度与最冷月均温、生长季降水、总干面积和立木密度呈显著正相关,与乔木层丰富度、非生长季降水和坡度呈显著负相关;枯落物储量与厚度具有显著正相关关系,特别是在阔叶林和针叶林中,而对于针阔混交林来说二者并无显著相关性。研究结果可为黄土高原乃至中国北方地区生态系统碳循环评估和水土保持实践提供参考依据。
[Abstract]:The physical properties of forest litter reserves (LM) and thickness (LDD) can represent the species diversity of forest vegetation and ecological functions such as water conservation, material circulation and so on. However, the distribution of litter reserves and thickness and the influencing factors are seldom discussed. Taking the Loess Plateau as the study area, the data of the litter reserves and thickness of the main forest communities in this area were obtained by systematic sampling. The statistical methods such as the Kruskal-Wallis rank sum test, the linear mixed effect model and the ordinary least square regression were used. The difference of reserves and thickness of litter in different forest types, the influence factors of reserves and thickness and the relationship between them were analyzed. The results showed that there was no significant difference in litter reserves and thickness between coniferous forest and coniferous broadleaved mixed forest, but both of them were significantly larger than those of broadleaved forest. If there is a peak value of reserves between 35 掳-36 掳N and a peak value of thickness between 36 掳-37 掳N. 3) in the altitude direction, the distribution of reserves is not obvious. There was a significant positive correlation between litter reserves and annual air temperature, a significant positive correlation between total dry area and stumpage density, and a significant negative correlation between litter thickness and the coldest monthly mean temperature and precipitation in growing season. There was a significant positive correlation between total dry area and stand density, a significant negative correlation between tree layer richness, non-growing season precipitation and slope, and a significant positive correlation between litter reserves and thickness, especially in broad-leaved forest and coniferous forest. However, there was no significant correlation between the two for coniferous and broad-leaved mixed forest. The results can provide a reference for the assessment of carbon cycle and the practice of soil and water conservation in the Loess Plateau and even in the northern part of China.
【作者单位】：北京师范大学地表过程与资源生态国家重点实验室;北京师范大学资源学院;
【基金】：国家自然科学基金资助项目(41271059) 科技部科技基础性工作专项资助项目(2011FY110300)
【分类号】：S714

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