| PREDICTION OF SEDIMENT REDUCING BENEFIT UNDER DIFFERENT RAINFALL CONDITIONS AND CONTROL DEGREES ON THE LOESS PLATEAU DEGREES ON THE LOESS PLATEAU |
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| 作者姓名： | JIAO Ju-ying WANG Wan-zhong |
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| 作者单位： | Institute of Soil and Water Conservation，Chinese Academy of Sciences and Min istry of Water Resources，Yangling 712100，P.R.China; Northwest Sci-technology University of Agriculture and For estry，Yangling 712100，P. R.China |
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| 基金项目： | UndertheauspicesoftheNational973Project(2002CB111502),andtheKnowledgeInnovationProjectofChineseAcademyofSciences(KZCX1-10-04). |
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| 摘 要： | Soilerosionisoneofthemostseriousenvironmentalproblemsinthepresentworld.Itnotonlyrestrictstheproductionofagriculturebadly,butalsothreatensthenaturalenvironmentonwhichhumanbeinglive.Andthismakethemankindconfrontedwithtremendouschallenge.OntheLoessPlateau,soilandwaterlossisterrible,environmentisweak,anditshighsandyieldmakestheriverwayinthelowerreachesoftheHuanghe(Yellow)Riverfilledup,riverbeddrivenup,floodthreatprickedup,andresultsingreathiddentroublestothecontrollingoffloodandtherunningofirrig…
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| 关 键 词： | 水土流失 黄土高原 降雨 土壤侵蚀 水土保持 |
| 收稿时间： | 15 April 2002 |
Prediction of sediment reducing benefit under different rainfall conditions and control degrees on the loess plateau |
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| JIAO Ju-ying,WANG Wan-zhong.PREDICTION OF SEDIMENT REDUCING BENEFIT UNDER DIFFERENT RAINFALL CONDITIONS AND CONTROL DEGREES ON THE LOESS PLATEAU DEGREES ON THE LOESS PLATEAU[J].Chinese Geographical Science,2003,13(2):149-156. |
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| Authors: | Jiao Ju-ying Wang Wan-zhong |
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| Institution: | (1) Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, 712100 Yangling, P. R. China;(2) Northwest Sci-technology University of Agriculture and Forestry, 712100 Yangling, P. R. China |
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| Abstract: | Based on the distribution of hydrological stations and zoning of types of soil erosion, the Loess Plateau (310×103km2) is divided into 292 erosion units. And taking the erosion modulus >5000t/km2 as a criterion, the emphasis control area (149×103km2) of the Loess Plateau is demarked, and is divided into 10 control regions. The controllable area and the location of control
measures are conformed. Level terraces are mainly collocated on the 3°–15° slopes, woodland and grassland are collocated on
the >15° slopes, and the proportion of woodland to grassland is 8:2 in the forest belt, 5: 5 in the forest steppe belt, and
2: 8 in the steppe belt. The 9000 combinations of soil-water conservation measures in different rainfall conditions are obtained
by the permutation and combination method, according to the 9 rainfall frequencies and the controllable areas of level terrace,
woodland and grassland at 10% of control progress rate. The quality standards of level terrace, woodland and grassland are
ascertained. The evaluation indexes of soil-water conservation benefits of level terrace, woodland and grassland are established
respectively in the condition that rainfall index is higher than that of erosive index of sloping field. Based on the results
above, the sediment reducing benefit and soil erosion modulus in the different rainfall conditions and control degrees are
analyzed, which could provide a decision-making basis for soil-water loss control on the Loess Plateau.
Foundation item: Under the auspices of the National 973 Project(2002CB111502), and the Knowledge Innovation Project of Chinese
Academy of Sciences(KZCX1-10-04).
Biography: JIAO Ju-ying (1965 -), female, a native of Baoji County, Shaanxi Province, Ph. D., associate researcher, specialized
in environmental benefits of soil and water conservation, soil loss prediction, and vegetation restoration. |
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| Keywords: | Loess Plateau rainfall soil and water conservation sediment redu cing benefit |
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