( 2 ) the losses of organic carbon , nitrogen , phosphorus and potassium were different in different farming systems . this losses of these elements according to respective farming systems was the following order : tradition > grass stripe > contour ditch > fallow > contour dam . compared with traditional fanning practices , others farming systems reduced losses of organic carbon , nitrogen , phosphorus and potassium and losses in contour dam , contour and fallow were much less than grass stripe and contour ditch ( 2 )不同农作措施径流小区有机碳、氮、磷、钾流失差异明显，有机碳、氮、磷、钾流失总量的顺序为：顺坡农作水平草带水平沟休闲等高土埂，同顺坡农作相比，其他农作措施均有减少有机碳、氮、磷、钾流失的作用，以等高土埂、等高农作、休闲处理减少土壤有机碳、氮、磷、钾流失的效果较好。
2.
( 3 ) the farming systems which had a less degree of soil erosion and sedimentation , organic carbon was lost mainly through runoff but in farming systems in which soil erosion was serious such as in grass stripe , contour ditch , traditional farming system , the loss was through bed load . nitrogen loss through runoff was 81 . 9 % - 93 . 4 % of the total . this loss through runoff comprised 78 % - 87 . 6 % dissolved nhvn and no " 3 - n although the former was slightly higher than latter as it made up 55 . 14 % of the lost nitrogen ( 3 )侵蚀程度较轻，泥沙流失量较小，特别是推移质流失量较小的农作措施处理的径流小区，如休闲处理、等高土埂和等高处理的小区中有机碳流失以径流流失为主，相反，如水平草带处理、水平沟处理和顺坡农作处理的径流小区中，有机碳流浙江大学博土学位论文失以推移质流失为主。
3.
The results show that ( 1 ) the system of contour dams , contours and fallow had positive impact on water and soil losses than grass stripes and contour ditch . at the same time it was showed that contour dams , contours , fallow significantly reduced soil erosion and water loss , grass stripe and contour ditch had recorded reduction in water and soil losses although to a much less extent than above 3 farming systems . most of sediment was bed load in all the systems except in contour dams and contour fanning 研究的主要结论如下： 1 、运用坡面径流小区法系统地研究了当地农业生产活动中不同农作措施下红壤坡耕地水土流失特征、土壤养分流失规律及形态特征，结果表明： ( 1 )同顺坡农作措施相比：其它农作措施均具有明显减轻水土流失的作用，等高土埂，等高农作、休闲处理控制水土流失的效果优于水平草带和水平沟处理。
