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首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >The soil C pool in different agroecosystems derived from the dry tropical forest of Guanacaste, Costa Rica
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The soil C pool in different agroecosystems derived from the dry tropical forest of Guanacaste, Costa Rica

机译：来自哥斯达黎加瓜纳卡斯特干燥热带森林的不同农业生态系统中的土壤碳库

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摘要

Inventories of soil C pools are still lacking from tropical sites. Our objective was to assess total C and N concentrations in the different mineral soil fractions down to 50 cm depth in relation to selected physical and chemical properties of 5 ecosystems at La Flor Sustainable Center in Guanacaste, Costa Rica. The ecosystems studied were a derived savanna with scattered trees, a gallery forest, an abandoned Mango indigo/era L. plantation, a Citrus sp. plantation, and a Saccharum officinarum L. (sugarcane) plantation. Significant differences were found for the main fixed factor ecosystem for all variables analyzed (ANOVA). The TSC concentration was significantly higher in the sugarcane plantation compared to the rest of land use systems. The TSC concentration decreased significantly with increase in depth in all ecosystems and ranged from 20.3-38.3 to 4.3-20.9 g kg~(-1) in the 0-10 and 40-50 cm depth, respectively. In all cases, the clay+silt fraction (<50 μm) contained the highest C concentration. N concentration (0-10 cm depth) at La Flor ranged from 0.32 to 0.19%, and decreased in the order sugarcane > Curatella savanna > Mango and Citrus plantations > gallery forest. A principal component analysis (PCA) performed with all variables studied showed that the ordination of land uses (ecosystems) in the factorial plane defined by the first two axes was significant (Monte Carlo permutation test, P< 0.0001). The highest TSC pool down to 50 cm depth was obtained in the sugarcane plantation (160Mg C ha~(-1)) while less C was found in the rest of ecosystems, i.e. from 66 (gallery forest) to 80Mg C ha~(-1) (Curatella savanna). The TSC concentration obtained in the sugarcane plot is likely the result of the incorporation of surface residues into the soil that would have otherwise been lost through burning, which is the current practice in the region. Further studies on C stabilization in the clay fraction are thus needed to test the hypothesis of soil C enrichment due to residue management. Finally, trade-offs are to be considered for both preservation of the fragile dTf and the productivity of derived land uses that increases soil C at the same time.
机译：热带地区仍然缺乏土壤碳库的清单。我们的目标是评估哥斯达黎加瓜纳卡斯特市拉弗洛尔可持续发展中心的5种生态系统的选定物理和化学特性，评估低至50厘米深度的不同矿物土壤部分中的总碳和氮浓度。研究的生态系统是衍生的稀树草原，零散的树木，长廊森林，废弃的芒果靛蓝/ L。人工林，柑橘属。人工林和一个蔗糖人工林。对于所有分析的变量（ANOVA），发现主要固定因子生态系统存在显着差异。与其他土地利用系统相比，甘蔗种植园中的TSC浓度明显更高。在所有生态系统中，TSC浓度均随深度的增加而显着降低，在0-10 cm和40-50 cm深度范围内，TSC浓度分别为20.3-38.3至4.3-20.9 g kg〜（-1）。在所有情况下，粘土+粉砂含量（<50μm）都具有最高的C浓度。 La Flor的N浓度（0-10厘米深度）在0.32％至0.19％之间，并且依次从甘蔗>稀树大草原>芒果和柑橘种植园>画廊森林开始降低。对所有研究变量进行的主成分分析（PCA）表明，由前两个轴定义的阶乘平面中土地利用（生态系统）的排序是重要的（Monte Carlo置换检验，P <0.0001）。在甘蔗种植园（160Mg C ha〜（-1））中获得了最高的低至50 cm深度的TSC库，而在其他生态系统中，即从66（画廊森林）到80Mg C ha〜（- 1）（Curatella稀树草原）。在甘蔗田中获得的TSC浓度很可能是由于土壤残留物掺入土壤中的结果，否则这些残留物会因燃烧而损失掉，这是该地区目前的做法。因此，需要对粘土级分中的碳稳定进行进一步研究，以检验由于残留物管理而导致土壤碳富集的假说。最后，在保留脆弱的dTf和同时增加土壤C的衍生土地利用的生产率方面，应考虑取舍。

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