黄土高原亚高山草地退化对土壤种子库的影响

doi:10.11733/j.issn.1007-0435.2021.05.014

草地学报 ›› 2021, Vol. 29 ›› Issue (5): 972-981.DOI: 10.11733/j.issn.1007-0435.2021.05.014

黄土高原亚高山草地退化对土壤种子库的影响

牛瑞芳¹, 吴铁航², 柴宝峰¹

1. 山西大学黄土高原研究所, 山西亚高山草地生态系统教育部野外科学观测研究站, 山西太原 030006;
2. 南乔治亚大学生物系, 斯泰兹波罗佐治亚 30460-8042, 美国

收稿日期:2020-12-01 修回日期:2021-01-08 出版日期:2021-05-15 发布日期:2021-06-02
通讯作者: 柴宝峰,E-mail:bfchai@sxu.edu.cn
作者简介:牛瑞芳(1996-)，女，山西太原人，硕士研究生，主要从事恢复生态学研究，E-mail:5145891@163.com
基金资助:
国家自然科学基金（31772450）；山西省第十二批海外高层次人才引进计划资助资助

Effects of Subalpine Grassland Degradation on Soil Seed Bank in Loess Plateau

NIU Rui-fang¹, WU Tie-hang², CHAI Bao-feng¹

1. Institute of Loess Plateau, Shanxi University;Field Scientific Observation and Research Station of Subalpine Grassland Ecosystem in Shanxi Province, Ministry of Education, Taiyuan, Shanxi Province 030006, China;
2. Department of Biology, Georgia Southern University, Statesboro, GA 30460-8042, USA

Received:2020-12-01 Revised:2021-01-08 Online:2021-05-15 Published:2021-06-02

摘要/Abstract

摘要： 本试验对黄土高原亚高山草地不同退化程度下土壤种子库的物种组成、种子密度、分布特征以及影响因素进行了研究。结果表明，研究区地上植物有31种，分属于14科、25属；种子库植物有32种，分属于14科、31属；种子库的83.45%都分布于浅层土壤中（0~5 cm）。随着草地退化程度的加重，地上植被和地下种子库中多年生植物的比例减少，种子库密度与丰富度都显著下降（P<0.001）；极度退化样地的地上一年生植物增多，物种组成与地下种子库相似；轻度和中度干扰的样地中，地上植物与种子库的物种的组成具有显著差异（P<0.01）。总之，亚高山草地退化对土壤种子库产生了较大的影响，其中土壤pH与水分是影响种子库密度与丰富度主要的环境因素。极度退化草地种子库密度极低，地上植被靠自然更新很难恢复，需人工辅助。

关键词: 土壤种子库, 亚高山草地, 土地退化, 多样性

Abstract: In this paper,we investigated species composition,seed density,distribution characteristics,influencing factors of soil seed bank in subalpine grassland of Loess Plateau. There are 31 species of aboveground plants in research area,belong to 14 families and 25 genera,and there are 32 species of soil seed bank plants,which belong to 14 families and 31 genera. 83.45% of the soil seed bank in subalpine grassland was distributed in shallow layer soil (0~5 cm). With the aggravation of grassland degradation,the proportion of perennial plants in aboveground and underground seed banks decreased,and the density and richness of soil seed banks decreased significantly (P<0.001). There were more annual plants above ground in extremely degraded plots,which were consistent with that in underground seed banks. The species composition between aboveground vegetation and underground seed bank in plots with mild and moderate disturbance weas significantly different (P<0.01). In conclusion,the degradation of subalpine grassland has a great impact on the soil seed bank,and soil pH and soil moisture are the main environmental factors affecting seed bank density and richness. Because of the low density of the soil seed bank,artificial assistance is needed to restore vegetation in extremely degraded grassland rather than natural renewal.

Key words: Soil seed bank, Subalpine grassland, Land degradation, Diversity

中图分类号:

S812

牛瑞芳, 吴铁航, 柴宝峰. 黄土高原亚高山草地退化对土壤种子库的影响[J]. 草地学报, 2021, 29(5): 972-981.

NIU Rui-fang, WU Tie-hang, CHAI Bao-feng. Effects of Subalpine Grassland Degradation on Soil Seed Bank in Loess Plateau[J]. Acta Agrestia Sinica, 2021, 29(5): 972-981.

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黄土高原亚高山草地退化对土壤种子库的影响

Effects of Subalpine Grassland Degradation on Soil Seed Bank in Loess Plateau

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