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在陕西省长武县黄土高原农业生态试验站进行了在相同的上方来水量18L/min条件下3种不同腐殖酸类(NHA、BFA、FA)的黄土坡面侵蚀和养分流失的试验,分析了不同腐殖酸类及不同量的同一腐殖酸对土壤侵蚀和养分流失的影响。结果表明:不同量的NHA处理下,径流量均随时间的增加而增加,NHA浓度150,300g/m~2的坡面径流量是500g/m~2的坡面径流量的1.14,1.08倍,含沙率和Br-浓度均随时间的增加而减少,累积径流量、累积泥沙量、累积流失量均随用量的增加而减少,150,300g/m~2的坡面累积泥沙量是用量500g/m~2的2.16,1.87倍,累积Br-流失量是用量500g/m~2的1.38,1.23倍,用量500g/m~2 NHA对防止土壤侵蚀和养分流失的效果最佳;不同浓度FA处理下,径流量随时间的增加而增加,FA浓度为0.1%,0.03%的累积径流量是浓度0.05%的1.19,1.33倍,含沙率和Br-浓度大体随时间的增加而减少,累积径流量、累积泥沙量、累积流失量均随浓度的增加先减少后增加,浓度为0.1%,0.03%的累积泥沙流失量是浓度0.05%的3.03,4.09倍,累积Br-流失总量是0.05%Br-流失总量的1.1,1.26倍,浓度0.5%FA对防止土壤侵蚀和养分流失的效果最佳;不同浓度BFA处理下,径流量随时间的增加而增加,BFA浓度为0.1%,0.05%的坡面累积径流量是浓度0.03%的1.15,1.1倍,含沙率和Br-浓度随时间的增加而减少,累积径流量、累积泥沙量随浓度的增加而增加,累积流失量随浓度的增加先减少后增加,浓度为0.1%,0.05%累积泥沙量是0.03%累积泥沙总量的1.36,0.49倍,Br-流失总量是0.05%Br-流失总量的4.06,3.5倍,浓度0.5%BFA对防止土壤侵蚀和养分流失的效果最佳;综合考虑3种不同腐殖酸类防止坡面侵蚀和养分流失效果为BFA>FA>NHA。
Soil erosion and nutrient loss of three humus (NHA, BFA, FA) under the same upper water flow rate of 18L / min were tested in the Loess Plateau Agroecological Experimental Station of Changwu County, Shaanxi Province. The effects of different humic acids and different amounts of the same humic acid on soil erosion and nutrient loss were analyzed. The results showed that runoff increased with the increase of time under different NHA treatments. The runoff at 150 and 300 g / m ~ 2 slopes was 1.14 and 1.08 times of that at 500 g / m ~ 2, Both sediment concentration and Br-concentration decreased with the increase of time. The cumulative runoff, accumulated sediment and accumulated loss all decreased with the increase of the amount of sediment. The cumulative sediment concentration of 150 and 300 g / m 2 was 500g / m ~ 2 2.16,1.87 times, the cumulative amount of Br-loss is 1.38,1.23 times the amount of 500g / m ~ 2, the amount of 500g / m ~ 2 NHA to prevent soil erosion and nutrient loss of the best; different concentrations Under the FA treatment, runoff increased with time, the concentration of FA was 0.1%, the cumulative runoff of 0.03% was 1.19,1.33 times of the concentration of 0.05%. The sediment concentration and Br-concentration decreased with the increase of time, The accumulative runoff, accumulated sediment and cumulative loss all decreased first and then increased with the increase of concentration, with a concentration of 0.1%. The cumulative amount of sediment loss at 0.03% was 3.03 and 4.09 times of the concentration of 0.05% The amount of 0.05% Br-total loss of 1.1,1.26 times the concentration of 0.5% FA to prevent soil erosion and nutrient loss of the best; different concentrations of BFA treatment, the runoff at any time , The BFA concentration was 0.1%. The cumulative runoff of 0.05% slope was 1.15,1.1 times of the concentration of 0.03%. The sediment concentration and Br-concentration decreased with the increase of time. The cumulative runoff, accumulated sediment The amount of cumulative loss increased first and then increased with the increase of the concentration at a concentration of 0.1%. The cumulative amount of 0.05% sediment was 1.36 times and 0.49 times of the total amount of sediment. The total amount of Br-loss Which is 4.06 and 3.5 times of the total amount of 0.05% Br-loss. The effect of 0.5% BFA on the prevention of soil erosion and nutrient loss is the best. Combining the three kinds of humic acids to prevent slope erosion and nutrient loss is BFA> FA> NHA.