中文摘要：

为了摸清黄土高原主要产沙区在不同治理阶段的减沙成效及其空间分布特征，为水土保持远景规划提供参考依据，采用“水文-地貌法”，研究了近50年来黄土高原侵蚀产沙的时空分异特征。结果表明：研究区域的年均侵蚀产沙量由治理前（1955—1969年）的17．5亿t减少到一期治理（1970—1989年）的10．8亿t、二期治理（1990—2009年）的6．6亿t、及退耕后（2000—2009年）的4．0亿t；侵蚀产沙量占全区总量比例较大的类型区为黄土峁状丘陵沟壑区、黄土粱状丘陵沟壑区、干旱黄土丘陵沟壑区和黄土高塬沟壑区。4个类型区退耕后减沙幅度分别为79．0％、82．0％、69．1％和63．8％；今后黄土高原治理的重点区域为侵蚀产沙强度≥2500r／km2·a的区域（5．3km2，占21．2％），而侵蚀产沙强度为1000～2500t／km2·a的区域（6．3km2，占25．0％）仍需要加强治理，侵蚀产沙强度〈1000t／km2·a的区域（13．4km2，占53．8％）也需要预防监督。

英文摘要：

In order to explicit the effectiveness of sediment reduction and its distribution in different control stages and to provide reference for long-term plan of soil and water conservation on the Loess Plateau, spatial- temporal differentiation characteristics of erosion-sediment yield on the Loess Plateau during recent half century was investigated by using hydrology-geomorphology＂ method. Study results show that the erosion-sediment yield of study area decreased from 1.75 × 10^9t in 1955 - 1969 to 1.08 × 10^9t in 1970 - 1989, to 0.66× 10^9 t in 1990 -2009 and to 0.40× 10^9t in 2000 -2009. Authors of this study suggest that the 53.8% of the study area with erosion-sediment intensity below 1 000 t/km2 a is still in need of control and management to avoid soil deterioration by erosion. Soil erosion control measures should be further strengthened in 25.0% area with erosion-sediment intensity of 1 000 -2 500 t/km2.a. The key management area is the 21.2% area with ero- sion-sediment intensity more than 2 500 t/km2.a.