This study aimed to determine the litterfall production, accumulation, decomposition rate and nutrient stocks, and to estimate the soil carbon (C) and nitrogen (N) stocks in three palm swamp ecosystems with different land use intensities in the Southeast of Brazil. Three palm swamp ecosystems with different land use intensities were evaluated: Agua Doce (AD), conserved area; Capivara (CV), area with small agricultural practices; and Buriti Grosso (BG), area with an intensive land use. Produced and accumulated litterfall from the Cerrado areas surrounding the palm swamps were collected from October 2014 to September 2015, and the Ca, Mg, K, and P concentrations were determined in the dry and rainy seasons. Soil samples were collected in the surrounding Cerrado and within the palm swamps until 100 cm soil depth to determine bulk density and soil C and N contents and stocks. Annual litterfall production in the Cerrado surrounding palm swamps was similar in AD (3.58 Mg·ha− 1·year− 1) and CV (3.79 Mg·ha− 1·year− 1), and was lower in BG (2.84 Mg·ha− 1·year− 1), and was more intense during the dry season. Furthermore, litterfall accumulation was higher in CV (7.12 Mg·ha− 1·year− 1) and BG (6.75 Mg·ha− 1·year− 1), culminating in lower decomposition rates. AD showed the highest decomposition rate (0.60) due to its vegetation structure and conservation. The macronutrient contents from the production and accumulated litterfall had a low influence of the land use, decreasing in the following order: Ca > K > Mg > P. Soils in CV and BG palm swamp areas showed higher values of C and N contents, due to the use of land for agricultural crops and cattle raising in an extensive (rangeland) system. The BG palm swamp, showed the highest C (124.03 Mg·ha− 1) and N (10.54 Mg·ha− 1) stocks due to the land use history with different agricultural practices over time. The litterfall dynamics in the Cerrado surrounding palm swamps was more affected by climatic variables than the intensity of land use, but the litter decomposition was more accelerated in the conserved area. Anthropic interventions with soil organic matter (SOM) inputs contributed to an increase in soil C and N stocks in the palm swamp ecosystems.

中文翻译：

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巴西棕榈沼泽生态系统的凋落动态和土壤碳氮氮储量

这项研究旨在确定凋落物的产生，积累，分解速率和养分储量，并估算巴西东南部三个土地利用强度不同的棕榈沼泽生态系统中的土壤碳（C）和氮（N）储量。对三种土地利用强度不同的棕榈沼泽生态系统进行了评估：阿瓜多斯（AD），保护区；Capivara（CV），农业实践较少的地区；以及土地使用密集的地区Buriti Grosso（BG）。从2014年10月至2015年9月，收集了棕榈沼泽周围塞拉多地区产生和累积的凋落物，并在干旱和雨季确定了Ca，Mg，K和P的浓度。在周围的Cerrado和棕榈沼泽内收集土壤样品，直到土壤深度达到100 cm为止，以确定堆积密度以及土壤中C，N的含量和储量。塞拉多棕榈沼泽周围的年凋落物产量在公元（3.58 Mg·ha-1·年-1）和CV（3.79 Mg·ha-1·年-1）相似，而BG则较低（2.84 Mg·ha-1·年-1）。 − 1·年− 1），在干旱季节更为强烈。此外，CV（7.12 Mg·ha-1·year-1）和BG（6.75 Mg·ha-1·year-1）的凋落物积累较高，最终分解率较低。由于其植被结构和保护作用，AD显示出最高的分解率（0.60）。生产和凋落物累积中的大量养分含量对土地利用的影响较小，按以下顺序降低：Ca> K> Mg>P。CV和BG棕榈沼泽地区的土壤显示出较高的C和N含量，这是因为在广泛的（牧场）系统中土地被用于农作物和养牛。BG棕榈沼泽显示出最高的C（124.03 Mg·ha-1）和N（10.54 Mg·ha-1）种群，这是因为随着时间的推移，不同农业实践的土地使用历史不同。气候变化对塞拉多棕榈沼泽周围的凋落物动态的影响大于对土地利用强度的影响，但在保护区中凋落物的分解更为迅速。用土壤有机质（SOM）输入的人类干预措施促进了棕榈沼泽生态系统中土壤碳和氮的增加。由于土地使用历史和不同的农业实践，随着时间的推移，碳储量最高（124.03 Mg·ha-1）和氮（10.54 Mg·ha-1）。气候变化对塞拉多棕榈沼泽周围的凋落物动态的影响大于对土地利用强度的影响，但在保护区中凋落物的分解更为迅速。用土壤有机质（SOM）输入的人类干预措施促进了棕榈沼泽生态系统中土壤碳和氮储量的增加。由于土地使用历史和不同的农业实践，随着时间的推移，碳储量最高（124.03 Mg·ha-1）和氮（10.54 Mg·ha-1）。气候变化对塞拉多棕榈沼泽周围的凋落物动态的影响大于对土地利用强度的影响，但在保护区中凋落物的分解更为迅速。用土壤有机质（SOM）输入的人类干预措施促进了棕榈沼泽生态系统中土壤碳和氮储量的增加。