采用样方法进行不同资源位群落调查,计算了塞罕坝地区华北落叶松人工林下草本植物的生态位宽度以及生态位重叠,结果表明:细叶苔草和蒲公英具有较大的生态位宽度,其LNB值分别为1.185 1和1.004 8,HNB值分别为0.431 4和0.294 2;除了32.61%的草本生态位宽度(LNB)值为0以外,大部分生态位宽度(LNB)集中在[0.4,0.6),[0.6,0.8)和[0.8,1.0),分别占19.57%,19.57%和15.22%。草本物种间生态位重叠大于0.1的占67.64%,表明落叶松人工林下草本植物之间因利用相同的资源位而产生的种间竞争较为激烈。 The sampling method was used to survey the different resource groups. The niche width and niche overlap of herbaceous plants under Larix principis-rupprechtii plantation in the Saihanba area were calculated. The results showed that Nicotiana benthamiana and Dandelion had larger niche breadth, The LNB values ​​were 1.185 1 and 1.004 8, respectively, and the HNB values ​​were 0.431 4 and 0.294 2, respectively. Most of the LNB values ​​were concentrated in the range of 0.4 except 32.61% of the LNB values ​​were 0, 0.6), [0.6,0.8] and [0.8,1.0), accounting for 19.57%, 19.57% and 15.22% respectively. The ecological niche overlap between herbaceous species accounted for more than 0.1, accounting for 67.64%, indicating that the interspecific competition among herbaceous plants under Larix gmelinii plantation is more intense due to the use of the same resources.