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To seek a feasible land use structure to control non-point pollution, by indoor artificial rainfall test, total nitrogen (TN) and total phosphorus (TP) as nutrient indexes, five types of soil in southwest of Henan Province were selected to study the nutrient loss rules under six kinds of rainfall intensity. The results were that: (1) the nutrient loss, runoff and sediment yield were accordingly increased with the increase of rainfall intensity in same type of soil. On same rainfall intensity, nutrient loss in the soil of farmland was larger than that in woodland and grassland, the nutrient content in terrace was higher than that in other soil. (2) The nutrient content in silt load was higher than that in bed load out of nutrient enrichment in sediment drain. There was a relationship of power index between nutrient loss and runoff while there was a linear correlation for sediment yield and nutrient loss. (3) The nutrients in farmland mainly went away with sediment erosion while in forest land, TN mainly drained with runoff and TP eroded with sediment. (4) At 0.01 of confidence level, the effect of rainfall intensity on nutrient loss was significant in runoff and sediment; land use types became more significant to TN loss than to TP drain in runoff while it had no prominent effect on the nutrient drain with sediment. Conclusion: It is important to popularize the projects of slope to terrace and grain for green in the region to improve crop yield and reduce non-point source pollution.

LOSS RULES OF TOTAL NITROGEN AND TOTAL PHOSPHORUS IN THE SOILS OF SOUTHWEST MOUNTAINS IN HENAN PROVINCE, CHINA UNDER ARTIFICIAL RAINFALL