首页|Soil loss tolerance in the black soil region of Northeast China

Soil loss tolerance in the black soil region of Northeast China

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Soil loss tolerance (T) is the maximum rate of annual soil erosion that is tolerated and still allows a high level of crop productivity to be sustained economically and indefinitely.In the black soil region of Northeast China,an empirically determined,default Tvalue of 200 (t/km2·a) is used for designing land restoration strategies for different types of soils.The objective of this study was to provide a methodology to calculate a quantitative T for different black soil species.A field investigation was conducted to determine the typical soil profiles of 21 black soil species in the study area and a quantitative methodology based on a modified soil productivity index model was established to calculate the T values.These values,which varied from 68 t/km2·a to 358 t/km2·a,yielded an average Tvalue of 141 t/km2·a for the 21 soil species.This is 29.5％ lower than the current national standard T value.Two significant factors that influenced the T value were soil thickness and vulnerability to erosion.An acceptable reduction rate of soil productivity over a planned time period of 1％ is recommended as necessary for maintaining long-term sustainable soil productivity.Compared with the currently used of regional unified standard T value,the proposed method,which determines T using specific soil profile indices,has more practical implications for effective,sustainable management of soil and water conservation.

soil loss tolerancequantitative approachproductivity index modelsoil erosion vulnerability indexblack soil speciesblack soil region of Northeast China

DUAN Xingwu、XIE Yun、LIU Baoyuan、LIU Gang、FENG Yanjie、GAO Xiaofei

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Asian International Rivers Center, Yunnan Key Laboratory of International Rivers and Transboundary Eco-security, Yunnan University, Kunming 650091, China

State Key Laboratory of Earth Surface Processes and Resource Ecology, School of Geography, Beijing Normal University, Beijing 100875, China

国家自然科学基金国家自然科学基金Nonprofit Sector Special Funds of the Ministry of Water Resources of China

40671111411012672010332030

2012

10.1007/s11442-012-0959-5

地理学报(英文版)
中国地理学会,中国科学院地理科学与资源研究所

地理学报(英文版)

CSTPCDCSCDSCI
影响因子：1.307
ISSN：1009-637X
年,卷(期)：2012.22(4)
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