Rainfall amount determines annual herb controls over soil seed bank and its similarity with vegetation in the Tengger Desert
作者机构：Shapotou Desert Research and Experiment StationNorthwest Institute of Eco‑Environment and ResourcesChinese Academy of SciencesLan‑zhou 730000Gansu ProvincePeople’s Republic of China University of Chinese Academy of SciencesBeijing 100049People’s Republic of China State Key Laboratory of Grassland Agro‑EcosystemsKey Laboratory of Grass‑land Livestock Industry InnovationMinistry of Agriculture and Rural AffairsEngineering Research Center of Grassland IndustryMinistry of EducationCollege of Pastoral Agriculture Science and TechnologyLanzhou UniversityLanzhou 730020Gansu ProvincePeople’s Republic of China
出 版 物：《Ecological Processes》 (生态过程（英文）)
年 卷 期：2022年第11卷第1期
页 面：27-37页
核心收录：
学科分类：0907[农学-林学] 09[农学] 0818[工学-地质资源与地质工程] 0903[农学-农业资源与环境] 0705[理学-地理学] 0706[理学-大气科学] 0901[农学-作物学] 0713[理学-生态学]
基 金：supported by the National Natural Science Foundation of China(Grant No.3197529) the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA23060200)。
主 题：Desert ecosystem Seed bank dynamics Rainfall Plant type Vegetation regeneration Annual herbs
摘 要：Background:Soil seed banks may offer great potential for maintaining and restoring desert ecosystems that have been degraded by climate change and anthropogenic disturbance.However,few studies have explored the year‑to‑year dynamics in the species composition(richness and abundance)of these desert soil seed banks.Thus,we conducted a 4‑year study to assess the effects of environmental factors(meteorology and microtopography)and aboveground vegetation on the soil seed bank of the Tengger Desert,China.Results:We found the seed bank was dominated by annual herb species both in species richness and abundance.More rainfall in the growing season increased the number of seeds in the soil seed bank,and quadrat micro‑elevation had a negative effect on soil seed bank size.The species composition in the seed bank had significantly larger between‑year similarity than that in the aboveground vegetation due to the dominance of annual herb species.For different life forms,the species composition of annual herbs showed distinctly larger temporal similarity between the aboveground vegetation and the seed bank compared with perennial herbs and shrubs.Conclusions:Our findings highlight that the combined effects of environmental factors and plant life forms deter‑mine the species composition(especially the abundance)of soil seed banks in deserts.However,if degraded desert ecosystems are left to regenerate naturally,the lack of shrub and perennial herb seeds could crucially limit their restoration.Human intervention and management may have to be applied to enhance the seed abundance of perennial lifeforms in degraded deserts.
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