Biotic Soil Activities
Biotic Soil Activities
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生物土壤活动
DOI：
10.1007/978-3-540-73526-7_21
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
F. Haubrich
中科院分区：
文献类型：
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作者：
S. Iost;F. Makeschin;M. Abiy;F. Haubrich
关于热带土壤不同碳库和碳通量的研究很少。更受限制的是我们对覆盖约11%的热带森林总面积的热带山地森林土壤的了解(Doumenge等人)。1995年)。在这些生态系统中，与低地热带森林相比，根和叶凋落物的分解减少(Coúteaux等人。2002年)。因此，热带山地森林在很大程度上促进了土壤中的碳固定。生态系统碳循环的一个重要组成部分是土壤CO2从土壤向大气的外排，这是土壤微生物活动和根系呼吸作用的结果。在全球范围内，二氧化碳流出量每年约为80pgC。热带和亚热带常绿阔叶林约占全球森林面积的最大部分。22 PG C-1年(Raich等人2002年)。通过人类活动，特别是燃烧化石燃料和将森林转化为其他土地利用形式，每年约有7pgC以二氧化碳的形式额外进入大气层。据推测，大气中二氧化碳的增加是观察到的温度升高的一个主要原因(Rustad 2001)，但只要仍不清楚碳库和通量对这种温度上升有何反应，从长远来看，气候变化将如何改变全球碳循环也仍然不清楚。本研究的目的是量化研究区1050~3060m高度范围内天然林的总碳、总氮含量、微生物生物量以及总、异养和根系呼吸作用。研究地点的详细情况由Moser等人给出。(本卷第15章)。
There are few studies investigating the different carbon pools and fluxes of tropical soils. Even more restricted is our knowledge of tropical mountain forest soils that cover about 11% of the total tropical forest area (Doumenge et al. 1995). In these ecosystems, decomposition of root and leaf litter is reduced in comparison with lowland tropical forest (Coûteaux et al. 2002). Thus, tropical mountain forests contribute substantially to carbon sequestration in soils. An important component of ecosystem carbon cycling is soil CO2efflux from the soil to the atmosphere, which results from the activity of soil microbes and root respiration. Globally CO2efflux amounts to approximately 80 Pg C year-1. Tropical and subtropical evergreen broadleaved forests contribute the largest parts of approx. 22 Pg C year-1(Raich et al. 2002). Through human activity, especially burning of fossil fuels and conversion of forests into other land use forms, about 7 Pg C enter the atmosphere additionally per year as carbon dioxide. It is assumed that increasing CO2in the atmosphere are a main cause for higher temperatures observed (Rustad 2001), but as long as it remains unclear how carbon pools and fluxes react on this rise of the temperatures, it is also remains unclear how the global carbon cycle will be altered by climate change in the long term. The objective of this study was to quantify total carbon and nitrogen contents, microbial biomass and total, heterotrophic and root respiration between 1050 m and 3060 m along an altitudinal gradient in natural forests of the research area. Details of the study sites are given by Moser et al. (Chapter 15 in this volume).