施氮量对羊草叶绿素含量和光合特性的影响  

Effect of nitrogen application rate on chlorophyll content and photosynthetic characteristics of Leymus chinensis

作　　者：仇春辰 胡雨彤 严涵 李会军 俞浩楠 赵婷婷 周小国 QIU Chun-chen;HU Yu-tong;YAN Han;LI Hui-jun;YU Hao-nan;ZHAO Ting-ting;ZHOU Xiao-guo(College of Resources and Environment,Xinjiang Agricultural University,Urumqi 830052,China;Xinjiang Key Laboratory of Soil and Plant Ecological Processes,Urumqi 830052,China;Institute of Soil and Water Conservation,CAS&MWR,Xianyang 712100,Shaanxi,China)

机构地区：[1]新疆农业大学资源与环境学院,乌鲁木齐830052 [2]新疆土壤与植物生态过程重点实验室,乌鲁木齐830052 [3]中国科学院水利部水土保持研究所,陕西咸阳712100

出　　处：《湖北农业科学》2024年第11期141-146,共6页Hubei Agricultural Sciences

基　　金：新疆维吾尔自治区自然科学基金项目(2022D01A187,2019D01B19);新疆农业大学研究生科研创新计划项目(XJAUGRI2022046)。

摘　　要：为探索施氮量对羊草(Leymus chinensis)叶绿素含量和光合特性的响应,采用盆栽试验的方式,设置氮素(纯N)5个梯度(0、75、150、225、300 kg/hm^(2)),在羊草拔节期测定羊草的生理指标和光合特性,分析不同施氮量对羊草生物量、叶绿素含量和光合特性的影响。结果表明,(1)与不施氮相比,施氮量在75~150 kg/hm^(2)范围内对羊草的总生物量均有一定的促进作用,并且在150 kg/hm^(2)时促进效果最为明显,提高了18.05%;(2)叶绿素a和类胡萝卜素的含量随着施氮量的增加呈先增后减的趋势,并且在150 kg/hm^(2)处理下达到最大值,分别为1.68 mg/g和0.64 mg/g;(3)羊草光合特性(净光合速率、气孔导度、蒸腾速率)随着施氮量的增加呈先增后减的趋势,在N150处理下最大。因此,150 kg/hm^(2)氮肥施入下羊草叶绿素含量为5个处理中最高,显著促进了羊草光合作用,在一定程度上增加了羊草生物量的积累。In order to explore the response of nitrogen application rate to chlorophyll content and photosynthetic characteristics of Leymus chinensis,five nitrogen(pure N)gradients(0,75,150,225,300 kg/hm^(2))were set in a potted experiment.Chlorophyll content and photosynthetic characteristics of L.chinensis were measured at the jointing stage.The effects of different nitrogen application rates on biomass,chlorophyll content and photosynthetic characteristics of L.chinensis were analyzed.The results showed as follows:(1)Compared with no nitrogen application,nitrogen application rate had a certain promotion effect on the total biomass of L.chinensis in the range of 75~150 kg/hm^(2),and the most obvious promotion effect was at 150 kg/hm^(2),which increased by 18.05%;(2)the contents of chlorophyll a and carotenoids increased first and then decreased with the increase of nitrogen application rate,and reached the maximum values at 150 kg/hm^(2),which were 1.68 mg/g and 0.64 mg/g,respectively;(3)photosynthetic characteristics(net photosynthetic rate,stomatal conductance and transpiration rate)of L.chinensis generally increased first and then decreased with the increase of nitrogen application rate,and reached the maximum under N150 treatment.It was concluded that 150 kg/hm^(2)nitrogen fertilizer had the best chlorophyll content,which promoted photosynthesis and further increased biomass accumulation of L.chinensis.

关 键 词：氮素 羊草(Leymus chinensis) 生物量 叶绿素 光合参数 

分 类 号：S543.9[农业科学—作物学]