|
|
3rd International Youth Forum on Soil and Water Conservation
|
|
|
| عنوان فارسی |
|
|
| چکیده فارسی مقاله |
|
|
| کلیدواژه‌های فارسی مقاله |
|
|
| عنوان انگلیسی |
Is the Runoff Coefficient Increasing or Decreasing After Ecological Restoration on China’s Loess Plateau |
|
| چکیده انگلیسی مقاله |
The “Grain for Green” project (GGP) was launched in 1999 on China’s Loess Plateau to reduce soil erosion, which had far-reaching impacts on ecological hydrology of watersheds. In this study, we use monthly runoff depth and precipitation datasets spanning 1961 to 2015 for 16 primary basins of the plateau to reveal changes in runoff generation capacity before and after the GGP. We use a Budyko-based elasticity method to calculate the runoff depth (R1) and runoff coefficient (C1) exclusively attributable to land use/cover change. Results indicate that the mean annual runoff coefficients (C0) decline by 26%–76% from the period 1961–1999 to 2000–2015. The annual observed runoff depth (R0) and C0 for 75% of basins show significant downward trends during 1961–1999; after the GGP, both annual R0 and C0 for over 50% of basins show upward trends. The study further finds that the increase of erosive rainfall (daily precipitation > 12 mm), reaching 4.6 mm.yr-1, is the main reason for upward trends of R0 /C0 during 2000–2015. After removing the effect of precipitation variation, we find that in this period, 11 out of 16 basins show decreased trends for C1, with the downward rate between 2.4% and 6.0% yr-1. The rate in semi-arid areas is about four times the rate in semi-humid areas. The results remind us that we need to consider the carrying capacity of local water resources when implementing the soil and water conservation measures across the Loess Plateau in the future. |
|
| کلیدواژه‌های انگلیسی مقاله |
|
|
| نویسندگان مقاله |
zheng|miao|zhang|li|wang|wu|gou |
|
| نشانی اینترنتی |
|
| فایل مقاله |
فایلی برای مقاله ذخیره نشده است |
| کد مقاله (doi) |
|
| زبان مقاله منتشر شده |
en |
| موضوعات مقاله منتشر شده |
|
| نوع مقاله منتشر شده |
|
|
|
|
برگشت به:
صفحه اول پایگاه |
دوره مرتبط |
کنفرانس مرتبط |
فهرست کنفرانس ها
|
