| 黄土丘陵区植物间正相互作用对幼苗更新的影响 |
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| 引用本文： | 葛芳红,刘红岩,赵富王,王宁,周正朝.黄土丘陵区植物间正相互作用对幼苗更新的影响[J].草业学报,2019,28(10):134-143. |
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| 作者姓名： | 葛芳红 刘红岩 赵富王 王宁 周正朝 |
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| 作者单位： | 陕西师范大学地理科学与旅游学院,陕西师范大学地理学国家级实验教学示范中心,陕西 西安 710119;陕西师范大学地理科学与旅游学院,陕西师范大学地理学国家级实验教学示范中心,陕西 西安 710119;陕西师范大学地理科学与旅游学院,陕西师范大学地理学国家级实验教学示范中心,陕西 西安 710119;陕西师范大学地理科学与旅游学院,陕西师范大学地理学国家级实验教学示范中心,陕西 西安 710119;陕西师范大学地理科学与旅游学院,陕西师范大学地理学国家级实验教学示范中心,陕西 西安 710119 |
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| 基金项目： | 国家自然科学基金项目 (41501290,41571260)和陕西省自然科学基金项目(2017JM4021)资助 |
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| 摘 要： | 幼苗阶段是植物生活史中最脆弱与关键的阶段,在土壤侵蚀强烈的黄土坡面,现有优势物种能否作为保育物种发挥植物间正相互作用促进幼苗更新与存活还缺乏研究。以黄土丘陵区的3种典型植物群落(白羊草群落、狼牙刺群落、铁杆蒿群落)为研究对象,采用样方调查法研究了植物斑块和裸地斑块下幼苗的密度、物种组成、物种多样性以及与地上植物物种相似性的变化规律,对不同植物间的正相互作用的强度进行分析。结果表明:1)在研究区共记录到幼苗 52种,分属22科,主要由禾本科、豆科和菊科植物构成,且以多年生草本植物为主;2)不同斑块下幼苗的物种数量、密度、多样性和相似性指数大体表现为植物斑块>裸地斑块;同为植物斑块,不同植物群落幼苗物种数量是铁杆蒿群落>白羊草群落>狼牙刺群落,密度为铁杆蒿群落>狼牙刺群落>白羊草群落,多样性指数为铁杆蒿群落>白羊草群落>狼牙刺群落;而裸地斑块的幼苗密度与多样性指数均为铁杆蒿群落>狼牙刺群落>白羊草群落。3种群落两种斑块幼苗与地上植物的相似性系数均低于0.5,属于极不相似或中等不相似水平;3)植物斑块中的成年植株对其周围的幼苗存在积极的正相互作用,但在侵蚀干扰更加强烈,环境更加恶劣的阳坡白羊草群落、狼牙刺群落不同斑块间物种组成差异更大,植物改善微生境,促进更多类型幼苗更新的作用更加明显。总之,3种植物作为保育植物均能促进幼苗存活,但随着植株个体生长,可能存在物种间相互作用的转变,使得幼苗和地上植物的相似性不高。
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| 关 键 词： | 正相互作用 斑块状植被 幼苗密度 物种多样性 相似性 |
| 收稿时间： | 2018-10-30 |
| 修稿时间： | 2019-04-01 |
Effects of positive plant interactions on seedling regeneration in the hill-gully region of the Loess Plateau |
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| GE Fang-hong,LIU Hong-yan,ZHAO Fu-wang,WANG Ning,ZHOU Zheng-chao.Effects of positive plant interactions on seedling regeneration in the hill-gully region of the Loess Plateau[J].Acta Prataculturae Sinica,2019,28(10):134-143. |
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| Authors: | GE Fang-hong LIU Hong-yan ZHAO Fu-wang WANG Ning ZHOU Zheng-chao |
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| Institution: | College of Tourism and Environment, National Experimental Teaching Demonstration Center of Geography Science, Shaanxi Normal University, Xi’an 710119, China |
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| Abstract: | The seedling stage is the most fragile and critical stage of the plant life cycle. The aim of this study was to determine whether existing dominant species could serve as nurse species to play a positive role in improving seedling establishment and survival on a loess slope where soil erosion is a serious problem. Three typical plant communities (Bothriochloa ischaemum, Sophora viciifolia, and Artemisia gmelinii) in the hill-gully region of the Loess Plateau were selected for in-depth analyses. For each community, the species composition, seedling densities, species diversity, and their relationship with the standing vegetation in two microhabitats (plant patches and bare land patches) were surveyed and analyzed. The results showed that: 1) the seedlings represented 52 species belonging to 22 families. Most seedlings in the B. ischaemum, S. viciifolia, and A. gmelinii communities belonged to the Poaceae, Leguminosae, and Poaceae family, respectively. Perennial herbs made up the largest proportion of seedlings. 2) Seedling density, seedling species diversity, and similarity indexes showed similar trends in seedling and standing vegetation. The values of these indexes were higher in vegetated patches than in bare land patches. In vegetated patches, the highest seedling density and species diversity index were in the A. gmelinii community; the lowest seedling density was in the B. ischaemum community; and the lowest species diversity index was in the S. viciifolia community. In the bare land patches, the communities could be ranked, from highest seedling density and species diversity index to lowest, as follows: A. gmelinii community>S. viciifolia community>B. ischaemum community. The similarity index between seedling and standing vegetation was less than 0.5 in both microhabitats of the three plant communities, indicating that the seedling and standing vegetation of each community were extremely dissimilar or moderately dissimilar. 3) These results show that adult plants of the three dominant species can play a positive role in the regeneration of seedlings in the surrounding area, and the strength of this positive interaction differs among species. The results indicate that all three plant species can serve as nurse plants to improve seedling survival, but that the positive interaction may weaken and turn into a competitive relationship as the seedlings grow, so that there is little similarity between seedlings and standing plants. |
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| Keywords: | positive interaction patched vegetation seedling density species diversity similarity |
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