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Response of Surface Soil Hydrology to the Micro-Pattern of Bio-Crust in a Dry-Land Loess Environment, China.

Wei W, Yu Y, Chen L - PLoS ONE (2015)

Bottom Line: Such effects, however, are not yet fully studied.We re-confirmed that mosses functioned better than lichens, partly due to their higher successional stage and deeper biomass accumulation.Fully-covered bio-crust pattern provides the best option for soil loss reduction and runoff retention, while a combination of upper bio-crust and lower bare soil pattern is the least one.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.

ABSTRACT
The specific bio-species and their spatial patterns play crucial roles in regulating eco-hydrologic process, which is significant for large-scale habitat promotion and vegetation restoration in many dry-land ecosystems. Such effects, however, are not yet fully studied. In this study, 12 micro-plots, each with size of 0.5 m in depth and 1 m in length, were constructed on a gentle grassy hill-slope with a mean gradient of 8° in a semiarid loess hilly area of China. Two major bio-crusts, including mosses and lichens, had been cultivated for two years prior to the field simulation experiments, while physical crusts and non-crusted bare soils were used for comparison. By using rainfall simulation method, four designed micro-patterns (i.e., upper bio-crust and lower bare soil, scattered bio-crust, upper bare soil and lower bio-crust, fully-covered bio-crust) to the soil hydrological response were analyzed. We found that soil surface bio-crusts were more efficient in improving soil structure, water holding capacity and runoff retention particularly at surface 10 cm layers, compared with physical soil crusts and non-crusted bare soils. We re-confirmed that mosses functioned better than lichens, partly due to their higher successional stage and deeper biomass accumulation. Physical crusts were least efficient in water conservation and erosion control, followed by non-crusted bare soils. More importantly, there were marked differences in the efficiency of the different spatial arrangements of bio-crusts in controlling runoff and sediment generation. Fully-covered bio-crust pattern provides the best option for soil loss reduction and runoff retention, while a combination of upper bio-crust and lower bare soil pattern is the least one. These findings are suggested to be significant for surface-cover protection, rainwater infiltration, runoff retention, and erosion control in water-restricted and degraded natural slopes.

No MeSH data available.


Related in: MedlinePlus

Infiltration simulation (a) and soil anti-scourability test (b).
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pone.0133565.g003: Infiltration simulation (a) and soil anti-scourability test (b).

Mentions: To analyze the effect of BSCs on soil hydrologic attributes more systematically, water infiltration capacity and soil anti-scourability under different crusts (BSCs and PCs) and non-crusted bare soils were simulated. The specific infiltration process was simulated by using the method of "two cutting-rings" [33], where an empty cutting-ring was placed directly on another that was filled with crusted soils (Fig 3A). Waterproof tape was used to prevent leakage between the rings. The rings were kept vertical. A funnel and beaker were placed below the rings to collect the filtrated water. The rings were 5.1cm high with a 100 cm3 total volume. The initial drops of water were recorded at a 1 min interval during the first 10 min, and the recorded time interval was then changed to 5 min. All infiltration experiments were conducted for 60 min.


Response of Surface Soil Hydrology to the Micro-Pattern of Bio-Crust in a Dry-Land Loess Environment, China.

Wei W, Yu Y, Chen L - PLoS ONE (2015)

Infiltration simulation (a) and soil anti-scourability test (b).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4514780&req=5

pone.0133565.g003: Infiltration simulation (a) and soil anti-scourability test (b).
Mentions: To analyze the effect of BSCs on soil hydrologic attributes more systematically, water infiltration capacity and soil anti-scourability under different crusts (BSCs and PCs) and non-crusted bare soils were simulated. The specific infiltration process was simulated by using the method of "two cutting-rings" [33], where an empty cutting-ring was placed directly on another that was filled with crusted soils (Fig 3A). Waterproof tape was used to prevent leakage between the rings. The rings were kept vertical. A funnel and beaker were placed below the rings to collect the filtrated water. The rings were 5.1cm high with a 100 cm3 total volume. The initial drops of water were recorded at a 1 min interval during the first 10 min, and the recorded time interval was then changed to 5 min. All infiltration experiments were conducted for 60 min.

Bottom Line: Such effects, however, are not yet fully studied.We re-confirmed that mosses functioned better than lichens, partly due to their higher successional stage and deeper biomass accumulation.Fully-covered bio-crust pattern provides the best option for soil loss reduction and runoff retention, while a combination of upper bio-crust and lower bare soil pattern is the least one.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.

ABSTRACT
The specific bio-species and their spatial patterns play crucial roles in regulating eco-hydrologic process, which is significant for large-scale habitat promotion and vegetation restoration in many dry-land ecosystems. Such effects, however, are not yet fully studied. In this study, 12 micro-plots, each with size of 0.5 m in depth and 1 m in length, were constructed on a gentle grassy hill-slope with a mean gradient of 8° in a semiarid loess hilly area of China. Two major bio-crusts, including mosses and lichens, had been cultivated for two years prior to the field simulation experiments, while physical crusts and non-crusted bare soils were used for comparison. By using rainfall simulation method, four designed micro-patterns (i.e., upper bio-crust and lower bare soil, scattered bio-crust, upper bare soil and lower bio-crust, fully-covered bio-crust) to the soil hydrological response were analyzed. We found that soil surface bio-crusts were more efficient in improving soil structure, water holding capacity and runoff retention particularly at surface 10 cm layers, compared with physical soil crusts and non-crusted bare soils. We re-confirmed that mosses functioned better than lichens, partly due to their higher successional stage and deeper biomass accumulation. Physical crusts were least efficient in water conservation and erosion control, followed by non-crusted bare soils. More importantly, there were marked differences in the efficiency of the different spatial arrangements of bio-crusts in controlling runoff and sediment generation. Fully-covered bio-crust pattern provides the best option for soil loss reduction and runoff retention, while a combination of upper bio-crust and lower bare soil pattern is the least one. These findings are suggested to be significant for surface-cover protection, rainwater infiltration, runoff retention, and erosion control in water-restricted and degraded natural slopes.

No MeSH data available.


Related in: MedlinePlus