| 三峡库区紫色土坡地养分状况及养分流失* |
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| 引用本文： | 蔡崇法,丁树文.三峡库区紫色土坡地养分状况及养分流失*[J].地理研究,1996,15(3):77-84. |
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| 作者姓名： | 蔡崇法 丁树文 |
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| 作者单位： | 华中农业大学土化系, 武汉430070 |
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| 摘 要： | 紫色土是三峡库区移民安置区的主要坡地土壤。本研究采用典型区域调查,代表性土壤剖面养分分析,结合实验小区人工降雨的方法,初步研究了发育于侏罗纪紫色砂泥岩母质上紫色土的养分状况、养分流失特点、过程及影响养分流失因素。
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| 关 键 词： | 紫色土 坡地 养分流失 |
| 收稿时间： | 1995-05-30 |
A PRELIMINARY STUDY ON THE CONDITIONS AND LOSSES OF NUTRIENTS OF PURPLE SOILS IN THREE GORGE RESERVIOR AREA(TGRA) |
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| Cai Chongf,Ding Shuwen,Zhang Guangyuan,Huang Li,Wang Daohe.A PRELIMINARY STUDY ON THE CONDITIONS AND LOSSES OF NUTRIENTS OF PURPLE SOILS IN THREE GORGE RESERVIOR AREA(TGRA)[J].Geographical Research,1996,15(3):77-84. |
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| Authors: | Cai Chongf Ding Shuwen Zhang Guangyuan Huang Li Wang Daohe |
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| Institution: | Huazhong Agricultural University, Wuhan 430070 |
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| Abstract: | Purple soil is a main soil group,distributed on the slopeland in TGRA.The productivity of purple soil is influenced by soil erosion and degradation.By investigating typical regions and measuring the nutrients(N,P,K,or.m) of main soil profiles,assisted with rainfall simulation experiments on the plots(2×5m).this paper discusses the nutrient loss processes and nutrient conditions of purple soil.which is formed on the purple sandy-clay deposits of Jurassic Period.The results are as follow:1.The Contents of organic matter and nitrogen are quite low.about 15g/kg and 0.5g/kg respectively.The content of phosphorus is also low.about 0.4g/kg.But,potassium is not deficiency,which is from the parent materials.2.Sediment contains more nutrients than surface soils,which is the main way of nutrient losses.So it is suggested that the factors influence on soil losses are closely related to nutrient losses,such as the cover of plant.slope degree and rainfall intensity etc..3.Silt(0.02-0.002) and clay(less than 0.002) fractions have higher proportions in the sediments in the runoff from slope surface than that in surface soils.Silts and clays are the carriers of nutrients.4.Nutrient losses are related to soil losses.The concentration of available nutrients in the sediments are much higher at the beginning of runoff on slopeland than that at the later periods,but the tatol losses per unit area is lower due to low soil losses. |
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| Keywords: | Nutrient losses Purple soil Slopeland |
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