欢迎访问《草业学报》官方网站,今天是 分享到:

草业学报 ›› 2018, Vol. 27 ›› Issue (1): 32-41.DOI: 10.11686/cyxb2017295

• 研究论文 • 上一篇    下一篇

不同生态恢复措施下宁夏黄土丘陵区典型草原土壤种子库特征

张蕊2, 马红彬1, 2, *, 贾希洋2, 周瑶2, 宿婷婷2, 蔡育蓉2, 周静静2   

  1. 1.宁夏大学西北土地退化与生态恢复省部共建国家重点实验室培育基地,宁夏 银川 750021;
    2.宁夏大学农学院,宁夏 银川 750021
  • 收稿日期:2017-07-03 修回日期:2017-09-11 出版日期:2018-01-20 发布日期:2018-01-20
  • 通讯作者: E-mail:ma_hb@nxu.edu.cn
  • 作者简介:张蕊(1994-),女,河北邯郸人,在读硕士。E-mail:zhangr.tiffany@qq.com
  • 基金资助:
    国家自然科学基金项目(31460632,31360582)和中国科学院“西部之光”人才培养引进计划项目(XAB2015A10)资助

Characteristics of soil seed banks in a typical grassland in the loess hilly region of Ningxia under different ecological restoration measures

ZHANG Rui2, MA Hong-bin1, 2, *, JIA Xi-yang2, ZHOU Yao2, SU Ting-ting2, CAI Yu-rong2, ZHOU Jing-jing2   

  1. 1.State Key Laboratory Breeding Base of Land Degradation and Ecological Restoration of North-western China, Ningxia University, Yinchuan 750021, China;
    2.Agricultural College, Ningxia University, Yinchuan 750021, China
  • Received:2017-07-03 Revised:2017-09-11 Online:2018-01-20 Published:2018-01-20

摘要: 开展土壤种子库的研究对草原植被恢复具有重要意义。以宁夏黄土丘陵区典型草原为对象,对封育(F15)、水平沟(S15)、鱼鳞坑(Y15)整地后15年草地以及长期放牧草地(F0)的0~15 cm土壤种子库的物种组成、密度特征、物种多样性及其与地上植被的相似性进行了研究。结果表明:1)土壤种子库植物以多年生植物为主,F0和S15种子库以禾本科物种比例最高,Y15和F15以菊科最高;植物种类以鱼鳞坑最多,封育次之,放牧地最少。2)相对于F0,Y15、S15和F15措施使土壤种子库密度增加,且以Y15增加最为明显。各处理下种子库优势物种各异,种子库密度具有表聚特征。3)各措施下,土壤种子库优势度、多样性和均匀度指数接近,鱼鳞坑提高了种子库丰富度指数;处理间土壤种子库存在一定程度的相似性,以封育和鱼鳞坑相似性最高,达到0.81。4)各措施下土壤种子库与地上植被多样性、丰富度、均匀度和优势度存在一定差异,种子库与地上植被的相似性系数在0.37~0.55之间,相似性总体较低。相对而言,鱼鳞坑土壤种子库和地上植被的相似性最高,是最有利于土壤种子库密度和丰富度增加的措施。

Abstract: The soil seed bank is of great significance in the restoration of grassland vegetation. We investigated the density characteristics, species diversity, and similarity to the above-ground vegetation of the soil seed bank in the 0-15 cm soil layer under different restoration measures in a typical steppe in Ningxia. The restoration measures were F15 (exclosure for 15 years); S15 (contour trench, 15 years); Y15 (fish-scale pits, 15 years grassland), and F0 (long-term grazed grassland). The results showed that: 1) The soil seed bank was dominated by seeds of perennials. The F0 and S15 seed banks had the highest proportion of Gramineae seeds, and the Y15 and F15 seed banks had the highest proportion of Compositae seeds. 2) Compared with F0, the Y15, S15, and especially the F15 treatments had denser seed banks. The seed banks had different characteristics and seed pool densities. 3) Under the different restoration measures, the soil seed banks had the same degree of dominance, diversity, and evenness index, but the fish-scale pits treatment had a richer seed pool. The strongest similarity between the seed bank and existing vegetation was in the fish seed bank (0.81). 4) There were some differences between the soil seed bank and above-ground vegetation in terms of diversity, abundance, evenness, and dominance. The values of the similarity coefficient between the seed bank and above-ground vegetation were generally very low (0.37-0.55). The highest similarity between the seed bank and above-ground vegetation was in the fish-scale pits treatment; therefore, this was the best restoration measure for increasing the density and abundance of the soil seed bank in the loess hilly region of Ningxia.