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为探讨坡改梯地区不同土地利用方式对土壤养分的影响,在巫山县选择撂荒地、林草地、农耕地、经果林等4种土地利用方式进行了研究。结果表明上述土地利用方式中土壤有机质含量由高到低依次为:撂荒地、林草地、农耕地、经果林,土壤全氮含量由高到低依次为撂荒地、林草地、农耕地、经果林,但是最大值和最小值之间仅相差0.029%;土壤全钾含量由高到低依次为农耕地、林草地、经果林、撂荒地;土壤速效钾含量由高到低依次为撂荒地、农耕地、经果林、林草地;土壤全磷含量由高到低依次为经果林、撂荒地、农耕地、林草地,最大值和最小值之间相差0.012%;速效磷含量由高到低依次为农耕地、撂荒地、经果林、林草地;撂荒地的土壤有机质、全氮、速效钾含量均最高,撂荒地土壤全磷、速效磷含量均位于第二位,全磷含量仅比经果林低0.002%,速效磷含量比农耕地少1.318mg.kg-1,但是撂荒地土壤全钾含量最低。由于撂荒地土壤养分含量除全钾含量较低外,其余养分含量均较高,因此研究认为撂荒地在坡改梯地区具有明显的培肥作用。
In order to explore the influence of different land use patterns on soil nutrients in slope-gradient area, four land-use patterns of abandoned land, forest and grassland, farmland and Jingguo Forest in Wushan County were studied. The results showed that the highest content of soil organic matter in the above land use patterns was abandoned land, forest grassland, agricultural land and economic fruit forest, followed by abandoned farmland, grassland, agricultural land, , But only a difference of 0.029% between the maximum and minimum values. From top to bottom, total potassium content in the soil was followed by cultivated land, forest grassland, fruit grove and wasteland. From high to low, Land, fruit forest and grassland. The content of total phosphorus in soil decreased from 0.012% in the highest value to the lowest in the order of economic forest, fallow land, agricultural land and grassland. The content of available phosphorus decreased from high to low Agricultural land, fallow land, fruit grove and grassland. The contents of soil organic matter, total nitrogen and available potassium in the wasteland were the highest. The content of total phosphorus and available phosphorus in the wasteland were all in the second place, and the content of total phosphorus was only lower than that in the forest 0.002%, the content of available phosphorus was 1.318mg.kg-1 less than that of the cultivated land, but the content of total potassium in abandoned land was the lowest. Since the content of nutrients in wasteland is lower than that of total potassium, the remaining nutrients are high, so the study shows that wasteland has obvious fertility-enhancing effect in the area of slope alteration.