氮添加降低晋北草地建群种赖草叶片钾重吸收效率  

Nitrogen Addition Decreased Potassium Resorption Efficiency of Leymus Secalinus Leaf in a Semi-Arid Grassland of Northern Shanxi

作　　者：高阳阳 林茂 梁雯君 郝杰[1,2,3] 刁华杰 王常慧 苏原[1,2,3] 董宽虎 GAO Yang-yang;LIN Mao;LIANG Wen-jun;HAO Jie;DIAO Hua-jie;WANG Chang-hui;SU Yuan;DONG Kuan-hu(College of Grassland Science,Shanxi Agricultural University,Taigu,Shanxi Province 030801,China;Shanxi Key Laboratory of Grassland Ecological Protection and Native Grass Germplasm Innovation,Taigu,Shanxi Province 030801,China;Youyu Loess Plateau Grassland Ecosystem Research Station,Youyu,Shanxi Province 037200,China)

机构地区：[1]山西农业大学草业学院,山西太谷030801 [2]草地生态保护与乡土草种质创新山西省重点实验室,山西太谷030801 [3]山西右玉黄土高原草地生态系统国家定位观测研究站,山西右玉037200

出　　处：《草地学报》2025年第3期806-812,共7页Acta Agrestia Sinica

基　　金：国家自然科学基金区域创新发展联合基金重点项目(U22A20576);国家自然科学基金(32371670);山西省优秀博士来晋工作奖励资金科研项目(SXBYKY2022042);山西农业大学科技创新基金项目(2021BQ64)资助。

摘　　要：养分重吸收是植物重要的养分保存策略,然而氮添加对植物钾重吸收效率的影响尚不清晰。本研究以晋北赖草草地为研究对象,依托2017年建立的不同水平氮添加实验平台,测定建群种赖草叶片和茎秆的钾含量,计算钾重吸收效率,探究氮添加对钾重吸收效率的影响。结果表明赖草叶片和茎秆钾含量均随氮添加量的增加呈线性增加;氮添加显著降低赖草叶片钾重吸收效率,而对茎秆钾重吸收效率无影响。叶片钾重吸收效率与成熟和衰老叶片钾浓度负相关,而茎秆钾重吸收效率与成熟茎秆钾浓度正相关与衰老茎秆钾浓度负相关。植物钾含量和钾重吸收效率与土壤速效钾无显著相关性。以上结果表明氮添加对植物钾浓度的影响因器官差异而不同,氮添加会降低植物钾的内循环。Nutrient reabsorption is an important nutrient conservation strategy in plants,while response of plant potassium(K)resorption efficiency(KRE)to nitrogen(N)addition was still unclear.This study was based on the experimental platform of nitrogen addition at different levels established in 2017 in a grassland dominated by Leymus secalinus located in Northern Shanxi Province,China.And the effect of N addition on the KRE was cal⁃culated through the measurement of the K contents in leaves and stems of L.secalinus.Our results showed that the K content in leaves and stems increased linearly with the increasing of N addition levels.Nitrogen addition significantly decreased the KRE in the leaves of L.secalinus,but had no significant effect on the KRE in stem of L.secalinus.The KRE in the leaves of L.secalinus was negatively correlated with K concentration in mature and senescent leaves,while the KRE in the stems of L.secalinus was positively correlated with K con⁃centration in mature stems and negatively correlated with K concentration in senescent stems.There was no sig⁃nificant correlation between plant K contents and the KRE and the soil available K.These results indicated that the effects of N addition on the K content in plants varied with plants organs,and we highlight that N addition could decreased the internal circulation of K in plants.

关 键 词：氮输入 钾 养分重吸收 叶片 茎秆 

分 类 号：S812.2[农业科学—草业科学]