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首页> 外文期刊>Ecosystems >Production of Total Potentially Soluble Organic C, N, and P Across an Ecosystem Chronosequence: Root versus Leaf Litter
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Production of Total Potentially Soluble Organic C, N, and P Across an Ecosystem Chronosequence: Root versus Leaf Litter

机译：整个生态系统时序中潜在总可溶有机碳，氮和磷的产生：根与叶凋落物

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Dissolved organic matter (DOM) plays several important roles in forest ecosystem development, undergoing chemical, physical and/or biological reactions that affect ecosystem nutrient retention. Very few studies have focused on gross rates of DOM production, and we know of no study that has directly measured DOM production from root litter. Our objectives were to quantify major sources of total potentially water-soluble organic matter (DOMtps) production, with an emphasis on production from root litter, to quantify and compare total potentially soluble organic C, N, and P (DOCtps, DONtps, and DOPtps) production, and to quantify changes in their production during forest primary succession and ecosystem development at the Mt. Shasta Mudflows ecosystem chronosequence. To do so, we exhaustively extracted freshly senesced root and leaf and other aboveground litter for DOCtps, DONtps, and DOPtps by vegetation category, and we calculated DOMtps production (g m?2 y?1) at the ecosystem level using data for annual production of fine root and aboveground litter. DOM production from throughfall was calculated by measuring throughfall volume and concentration over 2 years. Results showed that DOMtps production from root litter was a very important source of DOMtps in the Mount Shasta mudflow ecosystems, in some cases comparable to production from leaf litter for DONtps and larger than production from leaf litter for DOPtps. Total DOCtps and DONtps production from all sources increased early in succession from the 77- to the 255-year-old ecosystem. However, total DOPtps production across the ecosystem chronosequence showed a unique pattern. Generally, the relative importance of root litter for total fine detrital DOCtps and DONtps production increased significantly during ecosystem development. Furthermore, DOCtps and DONtps production were predominantly driven by changes in biomass production during ecosystem development, whereas changes in litter solubility due to changes in species composition had a smaller effect. We suggest that DOMtps production from root litter may be an important source of organic matter for the accumulation of SOM during forest ecosystem development.
机译：溶解性有机物（DOM）在森林生态系统的发展中起着重要作用，经历化学，物理和/或生物反应会影响生态系统养分的保持。很少有研究关注DOM产生的总速率，而且我们还没有直接测量根凋落物DOM产生的研究。我们的目标是量化潜在的水溶性有机物（DOMtps ）总产量的主要来源，并着重于根屑的产生，量化和比较潜在的可溶性有机C，N和P（DOCtps < / sub>，DONtps 和DOPtps ）生产，并量化山顶森林原始演替和生态系统发展过程中其生产的变化。 Shasta Mudflows生态系统时间序列。为此，我们按植被类别详尽提取了DOCtps ，DONtps 和DOPtps 的新鲜衰老的根和叶以及其他地上凋落物，并计算了DOMtps 的产量（gm使用生态系统水平的细根和地上凋落物年产量数据来确定？2 y？1 ）。通过测量2年内的穿透量和浓度计算出穿透产生的DOM。结果表明，根凋落物产生的DOMtps 是沙斯塔山泥流生态系统中DOMtps 的非常重要的来源，在某些情况下，与DONtps 的叶子凋落物的产量相当，并且大于DOMtps 的产量。 DOPtps的叶子凋落物。从77年到255年的生态系统，早期所有来源的DOCtps 和DONtps 的总产量连续增加。然而，整个生态系统时间序列的总DOPtps 产量表现出独特的格局。通常，在生态系统发育过程中，根凋落物对总细碎DOCtps 和DONtps 生产的相对重要性显着增加。此外，DOCtps 和DONtps 的产生主要受生态系统发育过程中生物量产生的变化驱动，而物种组成变化引起的凋落物溶解度变化影响较小。我们认为，根凋落物的DOMtps 生产可能是森林生态系统发育过程中有机质积累的重要有机物。

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