中文摘要：

当前我国农户兼业现象十分普遍。本文基于在内蒙古太仆寺旗的农户调查数据，采用单因素方差分析法，对生态脆弱区农户兼业及其对耕地利用的影响进行了研究。结果表明：当前研究区农业劳动力非农就业和农户兼业现象十分突出，而兼业程度不同的农户，其经营土地的方式差异明显。非农就业户通过将其土地转给其他农户而脱离了农业耕作，这同时满足了其他农户扩大土地经营面积的愿望。种植结构差异不大，均体现为劳动生产率高的作物具有优势；对于有耕地利用行为的纯农业户、I兼型农户和II兼型农户，随着兼业程度的增加，物质投入增加，说明农户兼业使其资金约束减小，增加了资金投入能力．但是在劳动力约束下，兼业农户的劳动力投入减少，且务农劳动力“妇女化”、“老龄化”和“文化低”等现象突出；作物单产和土地净收益纯农业户大于兼业农户，说明劳动投入对土地产出更为重要。文章最后认为建立农业劳动力非农就业与耕地利用相互协调的机制，是解决生态脆弱区生态安全与农业生产之间矛盾的重要途径。

英文摘要：

Part-time farming has been increasing steadily in China. It is currently the largest segment among all the farm sectors in the country. Based on rural household survey data in Taipusi County as a case site ofecologically-vulnerable areas in North China, we firstly classify farm households into four types according to the proportion of non-farm income in total income, and then compare their agricultural land use patterns to empirically examine the impacts of part-time farming on agricultural land use in this area. The results suggest that non-farming households rent out all their land and give up farming, and this satisfies the expectation of other households to expand land area. The crop planting structure was not significantly different among the households, which reflected the farmers＇ will to pursuit labor productivity. Part-time farming households invest more capital and materials than full-time faming households because the income derived from non-farm employment relaxes the financial constraint of households. However, the amount of labor input of part-time farming households tends to be less, and farming practices are dominated by the elderly, female and laborers withrelative low educations.Yields of crops and the benefit of agricultural land use incline to reduce, which suggest that the potential of land use productivity is more elastic to labor inputs than capital inputs in the study area.