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首页> 外文期刊>Plant and Soil >Litterfall and fine root biomass contribution to nutrient dynamics in second- and old-growth Douglas-fir ecosystems.
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Litterfall and fine root biomass contribution to nutrient dynamics in second- and old-growth Douglas-fir ecosystems.

机译：凋落物和优良的根生物量对次生和老生的道格拉斯冷杉生态系统养分动态的贡献。

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摘要

Litterfall and fine root production were measured for three years as part of a carbon balance study of three forest stands in the Pacific Northwest of the United States. A young second-growth Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] stand, a second-growth Douglas-fir with red alder (Alnus rubra Bong.) stand, and an old-growth (~550 years) Douglas-fir stand were monitored for inputs of carbon and nitrogen into the soil from litterfall and fine root production, as well as changes in soil C and N. Fine root production and soil nutrient changes were measured through the use of soil ingrowth bags containing homogenized soil from the respective stands. Litterfall biomass was greatest in the Douglas-fir-alder stand (527 g m-2 yr-1) that annually returned nearly three times the amount of N as the other stands. Mean residence time for forest floor material was also shortest at this site averaging 4.6 years and 5.5 years for C an N, respectively. Fine root production in the upper 20 cm ranged from 584 g m-2 in the N rich Douglas-fir-alder stand to 836 g m-2 in the old-growth stand. Fine root production (down to one meter) was always greater than litterfall with a below:above ratio ranging from 3.73 for the young Douglas-fir stand to 1.62 for the Douglas-fir-alder stand. The below:above N ratios for all three stands closely approximate those for biomass. Soil changes in both C and N differed by site, but the soil C changes in the old-growth stand mirrored those obtained in an ongoing CO2 flux study. Results from the soil ingrowth bags strongly suggest that this method provides a simple, but sufficient device for measuring potential fine root biomass production as well as soil chemical changes.
机译：作为对美国西北太平洋地区三个林分碳平衡研究的一部分，对凋落物和细根的生产进行了三年的测量。年轻的第二生长的道格拉斯冷杉[Pseudotsuga menziesii（Mirb。）Franco]林分，第二生长的道格拉斯冷杉与红al木（Alnus rubra Bong。）林分，以及老龄的（〜550年）道格拉斯冷杉监测林分中凋落物和细根产生的碳和氮的输入，以及土壤碳和氮的变化。通过使用装有来自土壤的均质土壤的土壤向内生长袋来测量细根产生和土壤养分的变化。各自的立场。凋谢的生物量最大的是道格拉斯冷杉-木林（527 g m-2 yr-1），每年返回的氮量是其他林木的三倍。在该地点，林地材料的平均停留时间也最短，C an N分别平均为4.6年和5.5年。上部20 cm的细根产量从富氮花旗松木架的584 g m-2到老树架的836 g m-2不等。细根产量（低至一米）总是大于凋落物，其比率为：幼小道格拉斯冷杉林分3.73到道格拉斯冷杉木林分1.62。三种氮的以下：高于N的比率非常接近生物质。碳和氮的土壤变化因地点而异，但旧林分中的土壤碳变化与正在进行的二氧化碳通量研究中获得的结果一致。土壤向内生长袋的结果强烈表明，该方法提供了一种简单但足够的设备，用于测量潜在的细根生物量生产以及土壤化学变化。

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