生态学报2017，Vol.37Issue(20)：6743-6752,10.DOI:10.5846/stxb201608061617
植冠与土壤种子库储存种子的萌发特性及策略
Seed germination characteristics and strategies of seeds stored in canopy and soil seed banks
摘要
Abstract
To determine how seeds improve their individual fitness by regulating their germination characteristics,we selected seven species with obvious canopy and soil seed banks in the hill-gully Loess Plateau.Effects of the duration of canopy storage (five storage periods) and soil storage (burial periods of five years) on seed germination were analyzed,which were compared with seeds of just matured or stored in laboratory as control.And the germination strategies of seeds after storage in canopy seed bank and soil seed bank were discussed.Our results indicated that the seed germination characteristics of the seven species were obviously different after storage.For Rosa xanthina and Cotoneaster multiflorus,storage improved the seed germination ability of the soil seed bank but had no effect on that of the canopy seed bank,and the seed germination rates of the soil seed bank of the C.multiflorus was considerably increased.For Lespedeza davurica and Sophora davidii,storage improved the seed germination ability of the canopy seed bank but weakened that of the soil seed bank.Meanwhile,the seed germination lasting times of the canopy seed bank were prolonged after storage,whereas the seed germination rate and seed germination lasting times of the soil seed bank were accelerated and shortened for L.davurica,respectively.For Artemisia giralaii and A.gmelinii,seed germination percentages initially increased but then declined as the duration of canopy storage increased,whereas the seed germination rate initially declined and then increased.Storage of the soil seed bank also delayed the seed germination for both species,whereas storage of both the canopy and soil seed banks increased the seed germination rates of A.gmelinii.For Syringa oblate,seed germination percentages initially increased but then declined as the duration of canopy storage increased,and storage of the soil seed bank both increased the germination rates and promoted seed germination.In conclusion,seeds from the hill-gully Loess Plateau either (1) took full advantage of favorable conditions to finish regeneration in right time quickly by increasing germination percentage,speeding up seed germination rate and germinating at high concentration during the early stages of storage or (2) shared the risk of unfavorable conditions by reducing germination percentage,slowing down seed germination rate and deferring seed germination through seed storage in the canopy or soil seed bank.In addition,the relationship between seed germination characteristics of the canopy storage and that of soil seed bank storage indicated that plant use the division and cooperation storages of canopy and soil seed bank to adapt environments and to respond disturbance,which strategies mainly presented as single-dominant and tow-complementary patterns.关键词
黄土丘陵沟壑区/植冠种子库/土壤种子库/种子萌发/种子策略Key words
hill-gully Loess Plateau/canopy seed bank/soil seed bank/seed germination/seed strategy引用本文复制引用
王东丽,焦菊英,王宁,寇萌,徐海燕,于卫洁..植冠与土壤种子库储存种子的萌发特性及策略[J].生态学报,2017,37(20):6743-6752,10.基金项目
国家自然科学基金项目(41371280,41501290) （41371280,41501290）
黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金(A314021402-1512) （A314021402-1512）
辽宁省博士启动基金(201601368) （201601368）
辽宁工程技术大学第五批生产技术问题创新研究基金(20160046T) （20160046T）
