沿海基干林带结构调控对林分冠层结构参数及林地土壤的影响  

Structural control of coastal backbone protection forest belt and its effects on stand canopy and soil

作　　者：成向荣[1] 虞木奎[1] 张翠[1] 王宗星[1] 葛乐[1] 吴统贵[1] 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江富阳311400

出　　处：《生态学杂志》2011年第3期516-520,共5页Chinese Journal of Ecology

基　　金：国家引进国际先进林业科学技术项目(2008-4-50);国家科技支撑项目(2009BADB2B0301)资助

摘　　要：以上海浦东沿海水杉基干林带为研究对象,分析水杉林分间伐以及间伐后林下套种其他树种构建复层林2种结构调控措施下林分冠层及林地土壤的变化。结果表明:间伐和复层林构建可显著促进上层乔木树高和胸径的生长,也有助于林下乔灌木和草本植物的发育;未间伐水杉林带LAI最高,其次为复层林带,间伐林分最低。各林分林隙分数的分布特征与LAI相反;3种林分土壤全N、全P和速效K含量差异不显著,而间伐林和复层林土壤速效P、水解N和有机质含量比未间伐林有进一步改善,但间伐林分和复层林带之间土壤养分状况没有显著差异;林分结构调控增加了0～50cm土壤有机碳储量,其中以0～15cm土层有机碳密度最高。复层林带和间伐林土壤呼吸速率比未间伐林分别提高了42%和33%。Taking the coastal Metasequoia glyptostroboides backbone protection forest belt in Pudong District of Shanghai as test object,this paper assessed the changes of stand canopy and soil property after thinning and after planting other trees under thinned stands.The results showed that both the thinned and the two-storied stands promoted the growth of upperstory tree height and diameter at breast height significantly,and also,accelerated the understory vegetation development.The leaf area index（LAI）was the highest in un-thinned M.glyptostroboides stands,followed by in two-storied stands,and in thinned stands.The gap fraction distribution of the three kinds of M.glyptostroboides stand was contrast to LAI.The total N,total P,and available K contents of the soils in the three kinds of M.glyptostroboides stand had no significant differences,while the soil available P,hydrolyzable N,and organic matter contents were higher in thinned and two-storied stands than in un-thinned stands.There was no significant difference in the soil nutrient contents between the thinned and two-storied stands.Forest structure control increased the soil organic carbon（SOC）storage in 0-50 cm layer,and the SOC density was the highest in 0-15 cm layer.The soil respiration in two-storied and thinned stands increased by 42% and 33%,respectively,compared with that in un-thinned stands.

关 键 词：沿海基干林带 结构调控 林分冠层 林地环境 

分 类 号：S718.5[农业科学—林学]