荒漠草原人工柠条林草本层植被的结构与动态
为系统认识柠条林草本层植被的物种组成特征及其动态变化规律，把握灌草结构及人工林系统的演变趋势，采用空间换时间的方法，以天然草地为对照，搭建一个由不同林龄样地构成的研究序列，并开展灌丛内外植被季节性动态的跟踪监测与分析.结果表明：1）对照草地和柠条林地草本层物种共计25种，分属于8个科23个属.16 a柠条林物种数最多（16种），随着林龄的增大，物种数逐渐减少，中亚白草和隐子草等多年生禾草开始出现，但是优势种以一年生短命植物为主.物种多样性指数则随林龄增长呈先增长后下降的趋势.2）草本层植被盖度、生物量与物种数的季节动态主要受降水、气温变化的影响，但是灌丛的存在显著延滞了草本层植被经历春季干旱后...
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| Published in | 浙江大学学报（农业与生命科学版） Vol. 41; no. 6; pp. 723 - 731 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
宁夏大学西北土地退化与生态恢复国家重点实验室培育基地/西北退化生态系统恢复与重建教育部重点实验室,银川,750021
2015
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1008-9209 |
| DOI | 10.3785/j.issn.1008-9209.2015.06.041 |
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| Summary: | 为系统认识柠条林草本层植被的物种组成特征及其动态变化规律，把握灌草结构及人工林系统的演变趋势，采用空间换时间的方法，以天然草地为对照，搭建一个由不同林龄样地构成的研究序列，并开展灌丛内外植被季节性动态的跟踪监测与分析.结果表明：1）对照草地和柠条林地草本层物种共计25种，分属于8个科23个属.16 a柠条林物种数最多（16种），随着林龄的增大，物种数逐渐减少，中亚白草和隐子草等多年生禾草开始出现，但是优势种以一年生短命植物为主.物种多样性指数则随林龄增长呈先增长后下降的趋势.2）草本层植被盖度、生物量与物种数的季节动态主要受降水、气温变化的影响，但是灌丛的存在显著延滞了草本层植被经历春季干旱后的生长恢复速度，并以25 a柠条林的生长节律变化最为突出.3）林龄显著改变了灌丛内外草本层植被盖度以及灌丛内草本层植被生物量的季节动态，林龄与季节因子间存在显著的交互作用.综上所述，荒漠草原人工柠条林草本层植被的结构与动态是林龄、季节以及空间异质性等因子交互作用下的产物，伴随人工柠条林的衰败，群落存在逐步向地带性植被演替的趋势，但是在以一年生短命植物为主要优势物种情况下，系统稳定性的维持和演替方向还存在诸多的不确定性. |
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| Bibliography: | 33-1247/S Summary Caragana intermedia is a leguminous shrub plant , which is planted in desert steppe area on a large scale , which can also be used as forage grass , with very important ecological and economic value . However , a series of shrub and grass resource competition problem emerged with the aging of C . intermedia shrublands . The growth of zonal perennial vegetation often subjected to great constraints , and self‐degradation of C . intermedia shrublands was also developed to different degrees . The reasonable collocation relations of shrub and grass were one of the key elements to maintain ecology and production services of C . intermedia shrublands in desert steppe .＆amp;nbsp;The objective of this study is to understand composition characteristics of herbaceous plant species and its dynamic change rules around the C . intermedia shrublands , and to reveal the structure of shrub and grass and the evolution trend of C . intermedia shrubland system . Taking natural grassland as a control , spatiotemp |
| ISSN: | 1008-9209 |
| DOI: | 10.3785/j.issn.1008-9209.2015.06.041 |