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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

DEM of the Guansihe watershed.
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pone.0132395.g002: DEM of the Guansihe watershed.

Mentions: All field observations were permitted to conduct at the 21.1 km2 Guansihe watershed (104° 46’─104° 49’ E and 31° 32’─31° 37’ N) by Youxian District Government of Mianyang City, Sichuan Province, China (Fig 1). The watershed lies in the upper reaches of the Yangtze River basin with landforms dominated by water-eroded hills. The elevations are between 480─630 m above sea level (a.s.l.) (Fig 2). Haplic acrisol, chromic cambisol and eutric regosol are the typical soils of this region of SW China and are the major soil types within the Guansihe watershed. The climate is classified as northern subtropical humid monsoonal, with a mean annual temperature of 16.1°C, mean annual relative humidity of 79% and mean annual precipitation of 921 mm occurring mainly in summer and autumn [34].


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)

DEM of the Guansihe watershed.
© Copyright Policy
Related In: Results  -  Collection

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

pone.0132395.g002: DEM of the Guansihe watershed.
Mentions: All field observations were permitted to conduct at the 21.1 km2 Guansihe watershed (104° 46’─104° 49’ E and 31° 32’─31° 37’ N) by Youxian District Government of Mianyang City, Sichuan Province, China (Fig 1). The watershed lies in the upper reaches of the Yangtze River basin with landforms dominated by water-eroded hills. The elevations are between 480─630 m above sea level (a.s.l.) (Fig 2). Haplic acrisol, chromic cambisol and eutric regosol are the typical soils of this region of SW China and are the major soil types within the Guansihe watershed. The climate is classified as northern subtropical humid monsoonal, with a mean annual temperature of 16.1°C, mean annual relative humidity of 79% and mean annual precipitation of 921 mm occurring mainly in summer and autumn [34].

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