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Soil Biological Properties of Restored Perennial Grassland in California

机译:加利福尼亚恢复多年生草地的土壤生物学特性

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摘要

Restoring native perennial bunchgrasses in California's non-native annual grassland has been notoriously difficult. A successful method has been to use agricultural techniques such as tillage and herbicide for two to three years to control exotic annuals before seeding with native perennials. Such measures have a strong impact on soil biology and biochemistry (Aon et al. 2001). Plowing of formerly undisturbed soil reduces microbial biomass levels in the upper soil layers and destroys the natural stratification of biological activity in the tilled layer. The stability of soil aggregates declines rapidly after tillage, altering soil structure and organic matter retention. Moreover, cultivated soils in the Central Coast region tend to have lower total and labile C than grasslands, due to both lower organic matter inputs and increased soil C and N mineralization rates due to tillage (Calder6n & Jackson 2002). Our objetive was to investigate the stability of soil microbial functions and nutrient turnover in the restoration process.
机译:在加利福尼亚非本地的一年生草地上恢复本地多年生束草非常困难。一种成功的方法是使用农业技术,例如耕种和除草剂达两到三年,以控制外来一年生植物,然后再种植本地多年生植物。这些措施对土壤生物学和生物化学有很大的影响(Aon等,2001)。翻耕以前未受干扰的土壤会降低上部土壤层中微生物的生物量水平,并破坏耕层中生物活性的自然分层。耕作后土壤团聚体的稳定性迅速下降,从而改变了土壤结构和有机质的保留。此外,中部沿海地区的耕作土壤总有机碳和不稳定碳素比草地要低,这是由于有机物质输入减少以及耕作导致土壤碳和氮矿化速率增加(Calder6n&Jackson 2002)。我们的目标是调查恢复过程中土壤微生物功能的稳定性和养分周转。

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