5种思茅松人工幼林生长及林下植物动态的研究

Growth Performance and Undergrowth Diversity of 5 Types of Pinus kesiya var. langbianensis Young Plantation

利用样地调查材料对营造于思茅清水河的5种思茅松人工幼林5年生期间其主栽树种思茅松林木的生长状况,以及林下灌木层和草本层的物种组成、多度、多样性、盖度、高度等的植物动态进行了研究。研究结果表明,5种人工幼林中,主栽树种思茅松林木胸径及树高生长最快的是思茅松+西南桦混交林,其后依次为思茅松+高阿丁枫混交林、思茅松+红木荷混交林、思茅松纯林Ⅰ、思茅松纯林Ⅱ。在思茅松+西南桦混交林中,思茅松树木的树高和胸径生长速率显著高于思茅松+红木荷混交林、思茅松纯林Ⅰ和思茅松纯林Ⅱ(p<0.5)。5种思茅松人工幼林,在其营造的5年生期间,林下草本层的植物物种丰富度变化不大,但其盖度逐渐提高,个体数量有较大的提高;灌木层的盖度、物种丰富度和数量呈现逐渐升高的趋势。该人工林若不进行有效的抚育措施,地带性的乡土灌木植物的盖度将会进一步扩大,以影响其人工林中思茅松林木的生长。

The growth performance and undergrowth diversity of 5 types of Pinus kesiya vat. langbianensis plantations of 5 years old cultivated in Qingshuihe of Simao prefecture were studied. The height and diameter growth of P. kesiya var. langbianensis were determined. The species composition, abundance, diversity, coverage and height of undergrowth of plantation were observed and calculated. The study results showed that among all the 5 types of plantations, the P. kesiya var. langbianensis in mixed forest the highest growth, next came the mixed forest of P. kesiya of P. kesiya var. langbianensis and B. alnoides, the of P. kesiya var. langbianensis and Betula alnoides had var. langbianensis and Altingia excelsa. In mixed forest height and DBH growth of P. kesiya var. lasngbianensis was significantly higher than other stands such as mixed forest of P. kesiya var. langbianensis and Schima wallichii, P. kesiya var. langbianensis pure forest （I） and P. kesiya var. langbianensis （II） （p 〈0. 5）. The abundance of undergrowth of 5 types of P. kesiya var. langbianensis plantation has unconspicuous change during the 5 years after planting, and the coverage increase gradually, and the number of plants increases significandy. The coverage, abundance and quantity of shrub layer show the tendency of increase. The study results also indicates that without effective tending, the coverage of indigenous shrub species will expand, and might inhibit the growth of objective species P. kesiya var. langbianensis.