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Simulation of Runoff Changes Caused by Cropland to Forest Conversion in the Upper Yangtze River Region, SW China.

Yu P, Wang Y, Coles N, Xiong W, Xu L - PLoS ONE (2015)

Bottom Line: The simulated total runoff generated from the two rainfall events displayed limited variation for the conversion of dry croplands to forest, while it strongly decreased after paddy fields were converted to forest.The effect of paddy terraces on runoff generation was dependent on the rainfall characteristics and antecedent moisture (or saturation) conditions in the fields.The reduction in simulated runoff generated from intense rainfall events suggested that afforestation and terracing might be effective in managing runoff and had the potential to mitigate flooding in southwestern China.

View Article: PubMed Central - PubMed

Affiliation: Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Wan-Shou-Shan, Beijing, 100091, P. R. China.

ABSTRACT
The "Grain for Green Project" is a country-wide ecological program to converse marginal cropland to forest, which has been implemented in China since 2002. To quantify influence of this significant vegetation change, Guansihe Hydrological (GSH) Model, a validated physically-based distributed hydrological model, was applied to simulate runoff responses to land use change in the Guansihe watershed that is located in the upper reaches of the Yangtze River basin in Southwestern China with an area of only 21.1 km2. Runoff responses to two single rainfall events, 90 mm and 206 mm respectively, were simulated for 16 scenarios of cropland to forest conversion. The model simulations indicated that the total runoff generated after conversion to forest was strongly dependent on whether the land was initially used for dry croplands without standing water in fields or constructed (or walled) paddy fields. The simulated total runoff generated from the two rainfall events displayed limited variation for the conversion of dry croplands to forest, while it strongly decreased after paddy fields were converted to forest. The effect of paddy terraces on runoff generation was dependent on the rainfall characteristics and antecedent moisture (or saturation) conditions in the fields. The reduction in simulated runoff generated from intense rainfall events suggested that afforestation and terracing might be effective in managing runoff and had the potential to mitigate flooding in southwestern China.

No MeSH data available.


Related in: MedlinePlus

Runoff change for the 90 mm rainfall event when cropland in 10% of watershed area was forested.The runoff changes were expressed as the percentage of watershed runoff under the current land cover (a: dry cropland converted to forest; b: paddy field converted to forest).
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pone.0132395.g006: Runoff change for the 90 mm rainfall event when cropland in 10% of watershed area was forested.The runoff changes were expressed as the percentage of watershed runoff under the current land cover (a: dry cropland converted to forest; b: paddy field converted to forest).

Mentions: The conversion of dry cropland to forest did not greatly impact on watershed runoff generation. For example, when dry cropland is converted to Pinus massoniana-Cupressus funebris mixed forest, the variation in runoff observed for the simulations ranged from -0.2% to +1.0% (Fig 6). The variability illustrated in this simulation is close to the relative error inherent in the GSH model (see Table 4). For the simulation using the 206 mm rainfall event, runoff response decreased by 1.0% when cropland on slopes with slope angle greater than 15° was converted to Pinus massoniana-Cupressus funebris mixed forest (Table 5).


Simulation of Runoff Changes Caused by Cropland to Forest Conversion in the Upper Yangtze River Region, SW China.

Yu P, Wang Y, Coles N, Xiong W, Xu L - PLoS ONE (2015)

Runoff change for the 90 mm rainfall event when cropland in 10% of watershed area was forested.The runoff changes were expressed as the percentage of watershed runoff under the current land cover (a: dry cropland converted to forest; b: paddy field converted to forest).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4507881&req=5

pone.0132395.g006: Runoff change for the 90 mm rainfall event when cropland in 10% of watershed area was forested.The runoff changes were expressed as the percentage of watershed runoff under the current land cover (a: dry cropland converted to forest; b: paddy field converted to forest).
Mentions: The conversion of dry cropland to forest did not greatly impact on watershed runoff generation. For example, when dry cropland is converted to Pinus massoniana-Cupressus funebris mixed forest, the variation in runoff observed for the simulations ranged from -0.2% to +1.0% (Fig 6). The variability illustrated in this simulation is close to the relative error inherent in the GSH model (see Table 4). For the simulation using the 206 mm rainfall event, runoff response decreased by 1.0% when cropland on slopes with slope angle greater than 15° was converted to Pinus massoniana-Cupressus funebris mixed forest (Table 5).

Bottom Line: The simulated total runoff generated from the two rainfall events displayed limited variation for the conversion of dry croplands to forest, while it strongly decreased after paddy fields were converted to forest.The effect of paddy terraces on runoff generation was dependent on the rainfall characteristics and antecedent moisture (or saturation) conditions in the fields.The reduction in simulated runoff generated from intense rainfall events suggested that afforestation and terracing might be effective in managing runoff and had the potential to mitigate flooding in southwestern China.

View Article: PubMed Central - PubMed

Affiliation: Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Wan-Shou-Shan, Beijing, 100091, P. R. China.

ABSTRACT
The "Grain for Green Project" is a country-wide ecological program to converse marginal cropland to forest, which has been implemented in China since 2002. To quantify influence of this significant vegetation change, Guansihe Hydrological (GSH) Model, a validated physically-based distributed hydrological model, was applied to simulate runoff responses to land use change in the Guansihe watershed that is located in the upper reaches of the Yangtze River basin in Southwestern China with an area of only 21.1 km2. Runoff responses to two single rainfall events, 90 mm and 206 mm respectively, were simulated for 16 scenarios of cropland to forest conversion. The model simulations indicated that the total runoff generated after conversion to forest was strongly dependent on whether the land was initially used for dry croplands without standing water in fields or constructed (or walled) paddy fields. The simulated total runoff generated from the two rainfall events displayed limited variation for the conversion of dry croplands to forest, while it strongly decreased after paddy fields were converted to forest. The effect of paddy terraces on runoff generation was dependent on the rainfall characteristics and antecedent moisture (or saturation) conditions in the fields. The reduction in simulated runoff generated from intense rainfall events suggested that afforestation and terracing might be effective in managing runoff and had the potential to mitigate flooding in southwestern China.

No MeSH data available.


Related in: MedlinePlus