伊犁绢蒿种子萌发对模拟氮沉降的响应  

Effect of simulated nitrogen deposition on the seed germination of Seriphidium transiliense

作　　者：郑丽 孙宗玖[1,2,3] 刘慧霞 周磊 周晨烨 ZHENG Li;SUN Zongjiu;LIU Huixia;ZHOU Lei;ZHOU Chenye(College of Grassland Science,Xinjiang Agricultural University,Urumqi 830052,Xinjiang,China;Key Laboratory of Grassland Resources and Ecology of the Western Arid Region,Ministry of Education,Urumqi 830052,Xinjiang,China;Xinjiang Key Laboratory of Grassland Resources and Ecology,Urumqi 830052,Xinjiang,China)

机构地区：[1]新疆农业大学草业学院,新疆乌鲁木齐830052 [2]西部干旱荒漠区草地资源与生态教育部重点实验室,新疆乌鲁木齐830052 [3]新疆草地资源与生态自治区重点实验室,新疆乌鲁木齐830052

出　　处：《草业科学》2023年第5期1266-1273,共8页Pratacultural Science

基　　金：国家自然科学基金项目(32060408);新疆维吾尔自治区重点实验室开放课题(2022D04003)。

摘　　要：以新疆蒿类荒漠建群种伊犁绢蒿(Seriphidium transiliense)为对象,采用尿素模拟氮沉降,研究了施氮量[0、0.4、0.8、1.2、1.6 g·(m^(2)·a)^(−1)]和施氮频率(施1次、施3次)对其种子萌发的影响。结果表明:施氮量和施氮频率对伊犁绢蒿种子的发芽率、发芽势、发芽指数影响均不显著(P>0.05),依次为84.75%~89.50%、81.50%~88.50%和16.14~19.17。氮添加显著影响了伊犁绢蒿根长、芽长和幼苗干重(P<0.01),且随施氮量增加呈下降趋势,1次施氮和3次施氮频率出现明显抑制效应的最小氮添加量分别为0.4和1.2 g·(m^(2)·a)^(−1)。相同氮添加量下1次施氮的抑制作用高于3次施氮,尤其是高氮添加量下施氮频率间存在显著差异(P<0.05)。总之,试验处理范围内氮沉降水平不影响伊犁绢蒿种子萌发出苗,但会抑制其幼苗生长发育,且相同氮添加量下多次施氮会减缓这种抑制作用。Seriphidium transiliense,a dominant species of sagebrush deserts in Xinjiang,was used to study the effects of nitrogen(N)addition rates[0,0.4,0.8,1.2,1.6 g·(m^(2)·a)^(−1)]and frequencies(once and thrice)on seed germination by simulating nitrogen deposition with urea.The results indicated that the nitrogen addition rate and frequency had no significant effects on the germination rate,germination potential,and germination index of S.transiliense seeds,which ranged from 84.75%to 89.50%,81.50%to 88.50%,and 16.14 to 19.17,respectively.However,nitrogen addition had significant effects on the root length,shoot length,and dry weight of seedlings(P<0.01),which decreased with increase in nitrogen levels.The minimum nitrogen addition conditions for growth inhibition were one-time addition of 0.4 g·(m^(2)·a)^(−1) and three-time addition of 1.2 g·(m^(2)·a)^(−1),and the inhibitory effect under single nitrogen addition was higher than that under threetime addition.There were significant differences in the S.transiliense response to addition frequencies at higher addition rates(P<0.05).In conclusion,the level of nitrogen deposition(within the experimental treatment range)did not affect the seed germination and emergence of S.transiliense;however,it did inhibit seedling growth and development,which reduced after multiple additions of nitrogen at the same nitrogen addition rate.

关 键 词：施氮量 伊犁绢蒿 施氮频率 种子萌发 新疆 荒漠植物 尿素 

分 类 号：Q945[生物学—植物学]