摘要
为探讨混交造林在黄河三角洲滨海盐碱地上的长期应用效果,调查了3个不同混交林和4个树种纯林的生长现况,对比研究了混交林中各树种与相应纯林之间在生长状况、叶片营养和生理生化特性上的差异。结果表明,土壤盐渍化的长期影响造成该地区人工混交林的总体生长状况较差,27a后的保存率处于43.3%-70.4%之间。与刺槐纯林相比,刺槐与白蜡、白榆和臭椿混交后其胸径、树高和保存率均显著降低,叶片中的氮、磷、钾、叶绿素含量和相对含水量减少,抗逆性能明显下降。与刺槐混交后,白蜡的生长状况和叶片特性受到一定程度的抑制,然而白榆和臭椿的胸径、树高、叶片营养元素和叶绿素含量均明显高于各自纯林;白榆和臭椿在与刺槐混交后其抗逆性能较纯林得到明显改善,主要表现为超氧化物歧化酶（SOD）、过氧化物酶（POD）活性和脯氨酸含量显著升高,而叶片中的束缚水/自由水比值和丙二醛（MDA）含量显著降低。
In order to explore the long-term effects of mixed afforestation in costal saline soil in the Yellow River delta, current status of 3 mixed and 4 pure plantations was investigated and the differences between mixed and pure plantations in growth, leaf nutrition and physico-biochemical characteristics were compared in this study. The results showed that the general growth status of mixed plantations was less desirable, only having a survival percentage of 43.3%-70.4%, due to long-term soil salinization. Compared with pure locust （Robinia pseudoacacia） plantation, DBH （diameter at breast height）, tree height and survival percentage of locust were all significantly reduced after mixed-planted with velvet ash （Fraxinus velutina）, siberian elm （Ulmus pumila） and Tree-of-Heaven （Ailanthus altissima）. Similarly, the contents of N, P, K and chlorophyll in leaves, leaf relative water content and stress tolerance ability of locust decreased in mixed plantations. Mixed afforestation constrained the growth and leaf characteristics of velvet ash in comparison to its pure plantation. The DBH, tree height, leaf nutritional element and chlorophyll contents of Siberian elm and Tree-of-Heaven were higher than those of pure plantations, respectively. The stress tolerance ability of both siberian elm and Tree-of-Heaven was elevated much due to the significant increase of superoxide dismutase （SOD）, peroxidase （POD） activities and proline content, and the decrease of the ratio of bound water to free water and malondialdehyde （MDA） content in leaves.
出处
《西北林学院学报》
CSCD
北大核心
2015年第1期144-149,共6页
Journal of Northwest Forestry University
基金
山东省科技发展计划项目(2010GNC10942)
山东省农业重大应用技术创新项目"黄河三角洲盐碱化土地高效利用模式配置研究"
关键词
混交林
黄河三角洲
生长状况
叶片营养
抗逆性能
mixed plantation
the Yellow River delta
growth status
leaf nutrition
stress tolerance activity
