凋落物及土壤浸提液对西伯利亚落叶松种子萌发的影响  

Effect of Litter and Soil Extracts on SeedGermination of Larix sibirica

作　　者：王亚菲 张青青 江康威 郭建兴 孙瀚博 WANG Yafei;ZHANG Qingqing;JIANG Kangwei;GUO Jianxing;SUN Hanbo(College of Life Sciences,Xinjiang Agricultural University,Urumqi 830052,China;College of Resources and Environment,Xinjiang Agricultural University,Urumqi 830052,China;College of Grassland,Xinjiang Agricultural University,Urumqi 830052,China;College of Geographical Sciences and Tourism,Xinjiang Normal University,Urumqi 830054,China)

机构地区：[1]新疆农业大学生命科学学院,乌鲁木齐830052 [2]新疆农业大学资源与环境学院,乌鲁木齐830052 [3]新疆农业大学草业学院,乌鲁木齐830052 [4]新疆师范大学地理科学与旅游学院,乌鲁木齐830054

出　　处：《森林工程》2024年第2期1-9,共9页Forest Engineering

基　　金：国家自然科学基金项目(2522GZRJJ)。

摘　　要：化感作用是植物间信息交流的一种方式,对森林的天然更新有重要影响。西伯利亚落叶松(Larix sibirica)更新困难且种子萌发率低,林下凋落物及表层土壤存在的化感作用可能是影响其自然更新的重要因素之一。研究西伯利亚落叶松林下凋落物和土壤不同质量浓度的浸提液(0、1、2、5、10、20、40、60、80和100 g/L)对其种子萌发的化感作用,并选用发芽率、发芽势、发芽指数和化感综合效应指数来表征不同类型的浸提液对西伯利亚落叶松种子萌发的影响。结果表明,1)经过浸提液处理的种子相较于CK(0 g/L)均提前进入萌发期,低质量浓度浸提液(凋落物浸提液质量浓度<100 g/L,土壤浸提液质量浓度<60 g/L)处理过的种子萌发周期也会变长;2)林下凋落物和土壤均能对其种子萌发产生影响,在一定质量浓度范围内表现为“低质量浓度促进,高质量浓度抑制”,且以80 g/L质量浓度的土壤浸提液抑制作用最强,发芽率降低了8.33%(P<0.05);3)化感综合指数表现为低质量浓度大于高质量浓度,随着质量浓度增加,化感作用强度表现为先减小后增大,促进作用逐渐减小进而转为抑制作用。西伯利亚落叶松的林下凋落物和土壤存在明显的化感作用,在一定程度上影响天然林更新。Allelopathy is a way of exchanging information between plants that has an important impact on the natural renewal of forests.Larix sibirica has difficulty in regeneration and low seed germination rate,and allelopathic effects in understory litter and topsoil may be one of the important factors affecting its natural regeneration.To study the allelopathic effects of litter and different concentrations(0,1,2,5,10,20,40,60,80 and 100 g/L)of soil extracts on seed germination of Larix sibirica forest,the germination rate,germination potential,germination index and allelopathic effect index were selected to characterize the effects of different types of leaching solution on seed germination of Larix sibirica.The results showed that:1)compared with CK(0 g/L),the other seeds treated by the extracts all entered the germination stage earlier,and the seeds treated with low concentration extracts(litter extract concentration<100 g/L,soil extract concentration<60 g/L)had a longer germination cycle.2)Both understory litter and soil can affect its seed germination rate,which was manifested as`low concentration promotion,high concentration inhibition'in a certain concentration range,and the inhibition effect was strongest at 80 g/L soil extracts,and the germination rate decreased by 8.33%P<0.05).3)The allelopathic composite index showed low concentration>high concentration,and with the increase of concentration,the intensity of allelopathic was manifested as first decreasing and then increasing,and the promoting effect gradually decreased and then turned into an inhibitory effect.There was obvious allelopathic effect on understory litter and soil of Larix sibirica,which may affect natural forest renewal to a certain extent.

关 键 词：西伯利亚落叶松 浸提液 化感作用 种子萌发 天然林更新 

分 类 号：S791.229[农业科学—林木遗传育种]