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Functional and structural landscape indicators of intensification,resilience and resistance in agroecosystems in southern Argentina based onremotely sensed data

机译:基于遥感数据的阿根廷南部农业生态系统集约化,复原力和抵抗力的功能和结构景观指标

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There is increasing interest in developing criteria to evaluate the environmental implications of intensive agricultural land use. This implies discriminating between nature and man-made effects upon structural and functional attributes of agroecosystems. Adequate indicators of these combined effects should be cost efficient yet compatible with the core of ecological theory on biodiversity, spatial organization and ecosystem stability. We developed resistance-resilience metrics of plant growth to evaluate the intensity of agricultural use in a temperate irrigated basin in southern Argentina. The metrics are based on an analysis of the components of a temporal series of vegetation indices computed at a low resolution from available globally remote sensed reflectance imagery. We related the developed metrics to the properties of the soils and plant canopies observed at field scale and high-resolution imagery of the basin. Soil depth, soil erosion status and land fragmentation account for large fractions of the variance of the distribution of functional groups of the plant canopies and are also correlated with smaller scale attributes of land vegetation cover. Resistance-resilience indicators constitute a cost-efficient and adequate approach to evaluate the degree of intensification of land agricultural use.
机译:人们对制定评估农业集约化土地使用对环境的影响的标准越来越感兴趣。这意味着要区分自然和人为对农业生态系统的结构和功能属性的影响。这些综合影响的适当指标应具有成本效益,但应与生态理论在生物多样性,空间组织和生态系统稳定性方面的核心思想相吻合。我们开发了植物生长的抗逆能力指标,以评估阿根廷南部温带灌溉盆地农业利用强度。度量基于对植被指数的时间序列的分量的分析,该植被指数的时间序列是从可用的全球遥感反射图像中以低分辨率计算的。我们将已开发的度量标准与在田间规模和盆地高分辨率图像上观察到的土壤和植物冠层的特性相关联。土壤深度,土壤侵蚀状况和土地破碎化占植物冠层功能组分布方差的很大一部分,并且还与土地植被的较小尺度属性相关。抵御能力指标是评估土地农业利用集约化程度的一种经济有效的适当方法。

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