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引用本文:刘静逸,牛艳东,郭克疾,蒋丽娟,罗学卫,吴小丽,徐佳娈.南洞庭湖杨树(Populus deltoides)清理迹地恢复初期涨水前后土壤种子库特征.湖泊科学,2021,33(2):539-549. DOI:10.18307/2021.0219
Liu Jingyi,Niu Yandong,Guo Keji,Jiang Lijuan,Luo Xuewei,Wu Xiaoli,Xu Jialuan.The characteristics of soil seed bank in the early restoration period before and after the flooding season of Populus deltoides cutting slash in south Lake Dongting. J. Lake Sci.2021,33(2):539-549. DOI:10.18307/2021.0219
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南洞庭湖杨树(Populus deltoides)清理迹地恢复初期涨水前后土壤种子库特征
刘静逸1,2,3, 牛艳东1,3,4, 郭克疾5, 蒋丽娟2, 罗学卫6, 吴小丽1,3,4, 徐佳娈1,3,4
1.湖南省林业科学院, 长沙 410004;2.中南林业科技大学, 长沙 410004;3.湖南洞庭湖湿地生态系统国家定位观测研究站, 岳阳 414000;4.洞庭湖流域生态系统管理与水资源可持续利用国际科技合作基地, 长沙 410004;5.国家林业和草原局中南调查规划设计院, 长沙 410014;6.益阳南洞庭湖自然保护区沅江市管理局, 益阳 413100
摘要:
本文研究了南洞庭湖杨树清理1 a、2 a后的迹地(简称1 a和2 a)和未清理杨树洲滩(ck)涨水前后土壤种子库特征变化及其与地上植被的关系.结果显示:杨树清理迹地土壤种子库共萌发物种23科59属65种,涨水前后土壤种子库密度和种类均表现出1 a > 2 a > ck的趋势,且随着土层加深而递减.退水后ck、1 a、2 a不同土层物种数量和密度较涨水前均有所减少,其中一或二年生物种较涨水前有所减少,多年生物种占比增加;湿生物种与中生物种数目较涨水前均有所减少,而2 a土壤种子库中生物种比例较涨水前有所增加.涨水前后土壤种子库Shannon-Wiener和Simpson指数变化较小,退水后Margalef指数较涨水前有所下降.退水后地上植被物种Shannon-Wiener和Simpson指数高于涨水前地上植被,而Margalef指数有所下降.涨水前Sørensen相似性系数表现为1 a > 2 a > ck的趋势,退水后表现为2 a > 1 a > ck的趋势,涨水前后不同恢复年份土壤种子库和地上植被优势物种所占比例有所差异.研究表明,南洞庭湖杨树清理迹地退水后土壤种子库密度和种类显著下降,随着恢复年份和水淹频次的增加,一或二年生物种迅速减少,多年生物种比例增加,地上植被物种均匀性有所增加,可见水文因子是影响南洞庭湖杨树清理迹地种子库恢复能力的重要因素.
关键词:  南洞庭湖  杨树  清理迹地  涨水  土壤种子库
DOI:10.18307/2021.0219
分类号:
基金项目:湖南省重点研发项目(2019NK2011)、湖南省林业科技创新专项湿地保护项目(湘财建指[2019]31号)、湖南省林业科技创新专项重点项目(XLK201901)和全球环境基金项目(GCP/CPR/043/GEF)联合资助.
The characteristics of soil seed bank in the early restoration period before and after the flooding season of Populus deltoides cutting slash in south Lake Dongting
Liu Jingyi1,2,3, Niu Yandong1,3,4, Guo Keji5, Jiang Lijuan2, Luo Xuewei6, Wu Xiaoli1,3,4, Xu Jialuan1,3,4
1.Hunan Academy of Forestry, Changsha 410004, P. R. China;2.Central South University of Forestry and Technology, Changsha 410004, P. R. China;3.Dongting Lake National Positioning Observation and Research Station of Wetland Ecosystem of Hunan Province, Yueyang 414000, P. R. China;4.International Technological Cooperation Base for Ecosystem Management and Sustainable Utilization of Water Resources in Dongting Lake Basin, Changsha 410004, P. R. China;5.Central South Inventory and Planning Institute of National Forestry and Grassland Administration Changsha 410014, P. R. China;6.Yiyang South Dongting Lake Yuanjiang Protection Bureau, Yiyang 413100, P. R. China
Abstract:
The relationship between the characteristics of the soil seed bank and aboveground vegetation before and after the flooding season were studied in the one year and two years after the Populus deltoides cutting slash and uncutting beach in south Lake Dongting. A total of 65 species of 23 families and 59 genera were germinated in the soil seed bank of the P. deltoides cutting slash, and 43 species were germinated after flooding season, the density and species number of the soil seed bank showed a trend of 1 a > 2 a > ck before and after the flooding season and decreased along with the soil depth. The number and density of species in different soil layers of ck, 1 a, and 2 a decreased after the flooding season, among them, the number of annual or biennial plants, hygrophyte and mesophytes species decreased after the flooding season, the proportion of perennial plants increased and the proportion of mesophytes species increased in 2 a after the flooding season. The Shannon-Wiener and Simpson indexes of the soil seed bank before and after the flooding season changed slightly while the Margalef index decreased after the flooding season. The Shannon-Wiener and Simpson index of aboveground vegetation species after the flooding season increased than before, while the Margalef index decreased. The Sørensen index shows a trend of 1 a > 2 a > ck before the flooding season, and after the flooding season, it shows a trend of 2 a > 1 a > ck. The proportions of dominant species in soil seed banks and aboveground vegetation differed in different restoration years before and after the flooding season. Therefore, the density and species of soil seed banks in P. deltoides cutting slash in south Lake Dongting decreased significantly after the flooding season, as the year of restoration and the frequency of flooding increased, the annual or biennial species decrease rapidly while the proportion of perennial species and the species evenness of aboveground vegetation increased, it can be seen that the hydrological factor is an important factor affected the recovery capacity of the P. deltoides cutting slash in south Lake Dongting.
Key words:  South Lake Dongting  Populus deltoides  cutting slash  flooding season  soil seed bank
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