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通过径流小区试验研究20,40,60m3种坡长条件下人为扰动地表对土壤养分含量的影响。结果表明,人为扰动地表小区的土壤养分含量均低于同一坡长的自然小区。其中土壤全氮、碱解氮、有机质、全磷、有效磷含量在3种坡长差异均显著,20m坡长的土壤有效磷含量差异最大,相差10.21mg/kg,比自然坡面小区少58%。土壤钾素只在20m坡长时,含量差异达显著水平。不同坡长的土壤养分含量,除自然坡面小区的磷素外,其他土壤养分的含量均随坡长增加而增加。不同坡长的人为扰动小区,其60m坡长小区的土壤全氮、碱解氮、有机质含量显著高于20m及40m坡长小区,20m小区与60m小区相比,土壤全氮、碱解氮、有机质含量分别降低36%,39%和46%;土壤磷素、钾素含量是20m坡长小区显著低于40m及60m坡长小区,20m小区土壤全磷、全钾含量分别为0.22,11.17g/kg,40m小区土壤全磷、全钾含量分别为0.35,17.59g/kg。不同坡长的自然坡面小区,土壤磷素含量是40m小区略高于20m及60m小区;土壤氮素、钾素、有机质含量随坡长变化规律与扰动地表小区一致。
The runoff plots were used to study the effects of man-made disturbances on soil nutrient contents under 20, 40 and 60m3 slope lengths. The results showed that soil nutrient content of surface disturbance area was lower than natural area with the same slope length. Among them, total nitrogen, available nitrogen, organic matter, total phosphorus and available phosphorus in soil were significantly different among the three slopes. Soil available phosphorus had the largest difference at 20m slope, with a difference of 10.21mg / kg, less than natural slope. %. Soil potassium content only reached a significant level at 20m slope length. Soil nutrient contents of different slopes increased with the increase of slope length, except the phosphorus in natural slope plot. The man-made disturbed plots with different slopes showed that the soil total nitrogen, available nitrogen and organic matter content were significantly higher than those of the 20 m and 40 m slopes in the 60m slope. Compared with 60m plots, the total nitrogen, available nitrogen, Organic matter content decreased by 36%, 39% and 46% respectively. Soil P and K content was significantly lower than that of the 40m and 60m long-slope plots in the 20m slope. Total phosphorus and total potassium contents in the 20m plots were 0.22 and 11. 17g / kg, 40m plot of soil total phosphorus, total potassium were 0.35,17.59g / kg. The natural slopes with different slope length had the content of phosphorus in the soil 40 m slightly higher than that in the 20 m and 60 m plots. The variation of soil nitrogen, potassium and organic matter along the slope length was consistent with the disturbed surface plots.