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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Aggregation of under canopy and bare soils in a Mediterranean environment affected by different fire intensities.
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Aggregation of under canopy and bare soils in a Mediterranean environment affected by different fire intensities.

机译：受不同火势影响的地中海环境中冠层下和裸露土壤的聚集。

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Soil macroaggregation in relation to soil organic matter (SOM) and calcium carbonate (CaCO3) content was studied, before and after experimental fires of different intensities, in two environments (under canopy and on bare soil). In 1995, two experimental fire treatments, based on the addition of different biomass amounts, were applied on a set of nine plots at the Permanent Field Station of La Concordia (Valencia, Spain). Three plots were burned with high intensity fire (T1), three with moderate intensity (T2) and three plots were left unburned to be used as control treatment (T3). Soils under canopy were characterized by higher macroaggregate stability (SMS), SOM content and mean weight diameter of aggregates (MWD) than bare soils, which presented higher CaCO3 contents. After the fires, tendencies to increase were observed in the SOM and SMS of all burned soils, probably because of the incorporation of partially burned plant material. The trends of SMS and SOM in T1 burned soils were towards to decrease with the occurrence of the first erosive rainfalls. These trends continued until the end of the study. MWD of under canopy soils on T1 and of soils on T2 showed a decreasing trend immediately after fire treatments. Not significant differences between sampling periods were found for CaCO3 content, with the exception of under canopy soils on T1 which tended to increase, and showed higher values at the end of the studied period. The differences observed initially between under canopy and bare soil disappeared after one year of fire in T1, which suggests a major degradation of soils affected by this treatment. Significant changes of the studied properties were not observed in unburned soils during one year of research. In these soils, organic matter showed significant correlations with macroaggregate stability and mean weight diameter. However, significant statistical relationships were not observed between the studied properties in burned soils, showing that fire impact probably affected other soil characteristics related to soil aggregation.
机译：在两种环境下（冠层下和裸露的土壤），研究了不同强度的实验火灾前后与土壤有机质（SOM）和碳酸钙（CaCO3）含量相关的土壤大型聚集体。 1995年，在La Concordia永久野外监测站（西班牙巴伦西亚）的9个地块上，进行了两种基于不同生物量添加的实验性火处理。用高强度火（T1）烧制了三个地块，使用中等强度（T2）烧制了三个地块，不烧制的三个地块用作对照处理（T3）。与裸土相比，冠层下的土壤具有较高的大骨料稳定性（SMS），SOM含量和骨料平均重量直径（MWD），后者的CaCO3含量较高。火灾后，观察到所有燃烧土壤的SOM和SMS都有增加的趋势，这可能是由于掺入了部分燃烧的植物材料造成的。随着第一次侵蚀性降雨的发生，T1燃烧土壤中SMS和SOM的趋势趋于减少。这些趋势一直持续到研究结束。 T1处理后的冠层下土壤和T2处理的土壤中MWD随即下降。采样期之间的CaCO3含量没有显着差异，除了T1上的冠层下土壤倾向于增加，并且在研究期末显示出更高的值。 T1火灾一年后，最初在冠层下和裸露的土壤之间观察到的差异消失了，这表明受此处理影响的土壤主要退化。在一年的研究中，未燃烧的土壤未观察到研究性质的显着变化。在这些土壤中，有机质与宏观骨料的稳定性和平均重量直径显示出显着的相关性。但是，在烧过的土壤中研究的特性之间未观察到显着的统计关系，表明火灾影响可能会影响与土壤聚集相关的其他土壤特性。

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