青海大通地区人工林林下植被结构及其生境分析

STUDY ON STRUCTURE AND LIVING SITUATIONS OF VEGETATION UNDER MAN-MADE FORESTS IN DATONG QINGHAI

采用样地、样线调查法,对青海省大通县的人工林林下植被的物种组成和优势种进行了初步研究。结果表明:人工林为草本、灌木的发育和植物群落的演替提供了必要的场所。针叶林如紫果云杉纯林、华北落叶松纯林及青海云杉×华北落叶松混交林的林下植被以耐荫植物为主;阔叶林如青杨纯林、白桦纯林的林下植被类型为喜光性植物;混交林如青杨×沙棘混交林、青杨×青海云杉混交林、白桦×青海云杉混交林的林下植被以喜阴性植物为主。阔叶纯林及阔叶混交林的林下植被生物量相对较大,而针叶纯林及针叶混交林的林下植被生物量相对较小。

Plant species and dominants were investigated by the methods of random sampling and sample strip under man - made forest in Datong Qinghai. The results showed, the growth situations of grass, shrubs and plants community succession were supplied by man - made forest. Shade - demanding plants were growth under needle leafs wood, such as Picea purpurea pure wood, Lar/x principis pure wood and Picea crasfolia x Larixprincipis mixed forest. Light - demanding grass were growth under broad - leaved wood, such as Populus cathayana pure wood, and Betula platyphylla pure wood. The shade - demanding plants were growth under mixed wood such as Populus cathayana x Hippophae rharnnoides mixed forest, Populus cathayanaxPicea crasfolia mixed forest, Betula platyphylla XPicea crasfolia mixed forest. There are bigger biomasses under broad -leaved pure forest and broad - leaved mixed forest than needle - leaf pure forest and needle - leaf mixed forest.