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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 >Changes of soil hydraulic properties under early-stage natural vegetation recovering on the Loess Plateau of China.
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Changes of soil hydraulic properties under early-stage natural vegetation recovering on the Loess Plateau of China.

机译：黄土高原天然植被恢复初期土壤水力特性的变化

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摘要

The changes of soil hydraulic properties under early-stage (from several years to a few decades) natural vegetation recovering are not well understood in semiarid zones. We hypothesized that early-stage vegetation recovering can change measurably soil hydraulic properties and this would behave differently from long-term (from several decades to hundreds of years) vegetation recovering. This study investigated the dynamics of soil hydraulic properties under natural vegetation recovering of different ages (1, 5, 9, and 16-20 years) as compare to cropland and 30-year-old secondary grassland (two controls) on the semiarid Loess Plateau. The hydraulic properties included dry bulk density, total porosity, and near-saturated hydraulic conductivity at the potential of -0.5, -1, -3 and -5 cm of water. The results showed that the increases of vegetation species, coverage and aboveground biomass did not improve soil hydraulic properties. Specifically, dry bulk density increased while total porosity and near-saturated hydraulic conductivity at various potentials decreased with the increase of abandonment years. Moreover, we found that it would take at least 20 years to reverse the decreasing trend for soil hydraulic conductivities. These results suggest that vegetation recovering may not necessarily ameliorate soil hydraulic properties.
机译：在半干旱地区，自然植被恢复的早期阶段（从几年到几十年）的土壤水力学性质的变化尚不十分清楚。我们假设早期的植被恢复可以显着改变土壤的水力性质，这与长期（从几十年到数百年）的植被恢复有不同的表现。这项研究调查了半干旱黄土高原不同年龄（1、5、9和16-20年）天然植被恢复下土壤水力学的动态变化，与耕地和30岁的次生草地（两个对照）相比。水力学性质包括干堆积密度，总孔隙率和在-0.5，-1，-3和-5 cm水势下的接近饱和的水力传导率。结果表明，植被种类，覆盖率和地上生物量的增加并不能改善土壤的水力特性。具体而言，随着弃置年限的增加，干容重增加，而各种电势下的总孔隙率和近饱和水力传导率却下降。此外，我们发现至少需要20年才能扭转土壤水力传导率的下降趋势。这些结果表明，植被恢复不一定能改善土壤的水力特性。

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