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首页> 外文期刊>European Journal of Soil Biology >Influence of the El Nino and La Nina climate events and litter removal on inorganic nitrogen dynamics in pine forest soils on Central Java, Indonesia.
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Influence of the El Nino and La Nina climate events and litter removal on inorganic nitrogen dynamics in pine forest soils on Central Java, Indonesia.

机译：厄尔尼诺和拉尼娜气候事件以及垃圾清除对印度尼西亚中爪哇省松林土壤中无机氮动态的影响。

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摘要

To determine to what extent environmental factors and anthropogenic disturbances dictate N dynamics in tropical forest soils, changes of concentrations of inorganic N in soil were investigated during a period of extreme climatic conditions caused by El Nino and La Nina. This allowed the determination of factors driving the N-dynamics in tropical soils more clearly than during normal seasonal cycles. Three N-limited pine forests in Central Java, Indonesia, were studied monthly for over a year. N-NH4+ and N-NO3- were abundant in the organic layers, and decreased with increasing depth. Regular litter removal from the forest floor and branch-cutting at two pine forest sites significantly reduced the N-NH4+ concentration in the organic and mineral layers, but had only a minor influence on N-NO3- concentration. The N-NH4+ and N-NO3- concentrations and pH showed a distinct seasonal variation with extremely large amplitude in all studied soil layers, this corresponded to variation in soil moisture content. Concentrations were low during the extreme dry period of El Nino of 1997, and significantly increased during the subsequent long wet period of La Nina. The largest changes occurred in the organic top layers and changes were more pronounced than during normal seasonal cycles. It is concluded that N-dynamics in litter and fragmentation layers were most influenced by seasonal precipitation and to a lesser degree by litter removal.
机译：为了确定环境因素和人为干扰在多大程度上决定了热带森林土壤中的氮动态，在厄尔尼诺和拉尼娜造成的极端气候条件下研究了土壤中无机氮浓度的变化。与正常季节周期相比，这可以更清楚地确定驱动热带土壤氮素动力学的因素。印度尼西亚中爪哇省的三个限氮松树林已被研究了一年多。 N-NH4 +和N-NO3-在有机层中含量丰富，并且随着深度的增加而降低。定期从森林地面清除凋落物并在两个松树林中砍伐树枝可以显着降低有机层和矿物层中的N-NH4 +浓度，但对N-NO3-浓度的影响很小。在所有研究的土壤层中，N-NH4 +和N-NO3-的浓度和pH值都显示出明显的季节性变化，且幅度非常大，这与土壤水分含量的变化相对应。在1997年的El Nino极端干旱期间，浓度较低，而在随后的La Nina长时间潮湿期间，浓度显着增加。最大的变化发生在有机顶层，并且与正常季节周期相比变化更为明显。结论是，凋落物和破碎层中的氮动力学受季节降水影响最大，而清除凋落物的影响较小。

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