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首页> 外文学位 >Spatial and temporal variation of soil organic matter in secondary temperate deciduous forests.
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Spatial and temporal variation of soil organic matter in secondary temperate deciduous forests.

机译：次生温带落叶林土壤有机质的时空变化

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The steady increase in atmospheric CO2 and the associated threat of global warming have resulted in a strong interest to evaluate the potential of terrestrial ecosystems, particularly forests, to serve as carbon sinks. Such evaluations require the understanding of how carbon flows and is stored within the various forest components. To this end, various research groups within Indiana University are taking very detailed measurements in various forest stands in the area (Hoosier and Morgan Monroe). The results presented in this dissertation are part of that larger research effort. The first part deals with the organic carbon content of the two main components of the soil: the forest floor and the mineral layers. The main factor found to affect the amount of carbon stored in the soil is the availability of moisture in the soil. Vegetation age was also found to be significant after accounting for the variability in other site factors; this results in a carbon accumulation rate of 0.015 kg M−2 yr−1 in the soil. The second part discusses the carbon, organic matter, and primary nutrient concentrations in various forest components. The various materials measured showed a lower carbon content than previous reports for other forests; this suggests that there may be an overestimation of the carbon stored in temperate forests in some previous reports. Nitrogen and potassium are the nutrients that differ the most among forest components. The last part integrates the carbon estimations in the soil and detritus with the carbon found in the live biomass. The amount of carbon sequestered by a forest is highly dependent on stand age. Our youngest site (14 yrs.) showed a rate of carbon fixation (without mineral soil) in the order of 0.3 kg M−2 yr −1. Once the forest reaches 100 years of age, that rate drops to 18% of its initial value. Most of this carbon is sequestered in the aboveground woody components.
机译：大气中CO 2 的稳定增加以及相关的全球变暖威胁，引起了人们强烈的兴趣来评估陆地生态系统（尤其是森林）作为碳汇的潜力。此类评估需要了解碳如何流动以及如何在森林的各个组成部分中存储。为此，印第安纳大学内的各个研究小组正在对该地区的各种林分进行非常详细的测量（Hoosier和Morgan Monroe）。本文提出的结果是该较大研究工作的一部分。第一部分处理土壤的两个主要成分的有机碳含量：森林地面和矿物层。发现影响土壤中碳存储量的主要因素是土壤中水分的可利用性。在考虑到其他地点因素的变化后，植被年龄也很重要。这导致土壤中的碳积累率为0.015 kg M -2 yr -1 。第二部分讨论了森林各个组成部分的碳，有机质和主要养分浓度。所测量的各种材料显示出的碳含量比其他森林以前的报告要低。这表明以前的一些报道可能会高估温带森林中储存的碳。氮和钾是森林成分之间差异最大的养分。最后一部分将土壤和碎屑中的碳估计与活生物量中的碳结合起来。森林的碳固存量高度依赖于林分年龄。我们最小的站点（14年）显示的碳固着速率（无矿质土壤）约为0.3 kg M -2 yr -1 。森林达到100年龄后，该比率将下降到其原始价值的18％。大部分碳被隔离在地上的木质成分中。

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