黄土高原马栏林区辽东栎更新特性研究

研究了黄土高原马栏林区主要植被类型中的辽东栎幼苗的数量特征,更新层幼苗、幼树的实生和萌生特性及其辽东栎在垂直结构上的数量分布。结果表明:(1)辽东栎幼苗在黄土高原马栏林区分布广泛且数量充足。不同的植被类型中辽东栎种群表现出不同的大小级结构,在油松—辽东栎混交林、油松林和辽东栎林中辽东栎种群的幼苗、幼树和成树均占一定的比例,而在油松—白桦混交林、白桦林、山杨林和山杨—白桦混交林中辽东栎种群则以幼苗和幼树为主。表明辽东栎种群在该地区植被的发展过程中将产生重要的作用。(2)辽东栎在这一地区是由实生和萌生的个体混合组成的。在各种植被类型中实生植株的密度都高于萌生植株,辽东栎种群的更新在该地区可能主要是通过实生植株来完成的,即辽东栎实生植株在更新过程中起重要的作用。但萌生植株作为辽东栎顺利通过瓶颈的一种手段,作为辽东栎种群繁衍和稳定的一种途径,在辽东栎种群的更新中也起着一定的作用。

Studies on the regenerative characteristics of Quercus wutaishanica in Malan Forest Region on the Loess Plateau

In this paper,the quantitative characteristics of Quercus wutaishanica seedlings,the seedling and sprout of seedlings and saplings in regenerative layer and its quantitative distribution in vertical structure were studied in the main vegetation types of Malan Forest Region on the Loess Plateau. The results showed that:(1)Q.wutaishanica seedlings widely distributed and their numbers were enough in this area. Q.wutaishanica populations had different size class structure in different vegetation types,the seedlings,saplings and adults of Q.wutaishanica populations all distributed in Pinus tabulaeformis—Q.wutaishanica mixed forest,P.tabulaeformis forest and Q.wutaishanica forest. Seedlings and saplings mainly distributed in P.tabulaeformis—Betula platyphylla mixed forest,B.platyphylla forest,Populus davidiana forest and P.davidiana—B.platyphylla mixed forest. This indicated Q.wutaishanica populations had an important effect on the development of vegetation in this region. (2)Q.wutaishanica were composed of both individuals from seedling and sprout. The densities of seedling crops were higher than that of sprout crops in different vegetation types. Its regeneration would rely mainly on seedling crops. Seedling crops would play an important role on the regeneration of Q.wutaishanica. As a means of passing all right bottleneck and keeping propagation and stability of Q.wutaishanica populations,sprout crops also had a certain effect on the regeneration of Q.wutaishanica.