中文摘要：

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、经呆杯等4柙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％0，速效磷含量比农耕地少1．318mg。kg，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。

英文摘要：

In order to investigate the impact of different land use in terracing area on soil nutrient, four kinds of land use, which are the forest and grassland, the abandoned land, orchard, the agricultural land, are chosen in Wushan country of Chongqing. The results showed that the organic matter content of the abandoned land〉the forest and grassland〉 the agricultural land〉 orchard, total Nitrogen： the abandoned land〉〉 the forest and grassland〉the agricultural land〉〉 orchard. But the difference is only 0. 029〉 between the maximum and minimum; total K： the agricultural land〉 the forest and grassland〉orchard〉 the a- bandoned land; available potassium： the abandoned land〉the agriculture land〉 orchard〉the forest and grassland; total P： orclaard〉the abandoned land〉 the agricultural land the forest and grassland. The difference is 0. 012 〉 between the maxi- mum and minimum. Available phosphorus., the agricultural land〉 the abandoned land〉 orchard〉 the forest and grassland. The contents of organic matter, total nitrogen, and available potassium in the abandoned land are highest and total phosphorus and available phosphorus is second. The contents of total phosphorus in the abandoned land are only 0. 002 % fewer than that of orchard. The contents of available phosphorus in the abandoned land are fewer 1. 318mg/kg than that of the agricultural land. But the content of total potassium in the abandoned is fewest. The contents of nutrient in the abandoned land, except total po- tassium, are high. This shows that the abandoned land in terracing area has apparent fertilizer effect.