摘要
分析干热河谷优势草本植物叶片、根系和土壤养分含量,有助于了解植物在恶劣生境下的养分循环、限制情况及生存策略.以干热河谷扭黄茅、拟金茅、芸香草3种优势草本植物为研究对象,研究叶片、根系和土壤碳(C)、氮(N)、磷(P)含量特征及其相关性.结果显示:(1)3种植物根系C含量随径级增大而增大,N、P则相反.(2)除扭黄茅叶片N含量显著低于Ⅰ级根,3种植物叶片C、N、P含量均显著高于根系.(3)3种植物土壤C含量与叶片、根系C含量均无显著相关性,叶片C含量与Ⅱ级、Ⅲ级根C含量的正相关性要强于Ⅰ级根.(4)除芸香草N,3种植物叶片N(P)含量仅与Ⅰ级根对应元素呈显著正(负)相关.(5)扭黄茅和拟金茅土壤N含量与叶片、Ⅰ级根N含量呈显著正相关;拟金茅和芸香草土壤P含量与叶片P含量呈显著正相关,与Ⅰ级根P含量呈显著负相关.此外,仅拟金茅土壤与叶片C:N间、N:P间呈显著正相关,其叶片与根系化学计量比的相关性强于扭黄茅和芸香草.综上,扭黄茅采取提高养分循环和根系更新速率的“胁迫忍耐型”生存策略来适应恶劣的环境;芸香草和拟金茅主要采取“竞争型”生存策略,具有较强的抵抗贫瘠环境的能力.(图3表8参42)
Determining the nutrient contents of leaf, root, and soil of dominant herbaceous plants in dry-hot valley is helpful to understand the nutrient cycle, limitation, and survival strategies of plants in harsh environment.We selected three dominant herbaceous plants in dry-hot valley, including Heteropogon contortus, Eulaliopsis binate, and Cymbopogon distans to study the relationship among carbon(C), nitrogen(N), and phosphorus(P)contents in leaf, root, and soil. Our results indicated that:(1) C content in roots of all three plants increased but N and P contents decreased with the increase of root diameters.(2) C, N, and P contents were significantly higher in leaves of all three plants than in all root diameters with the exception of N content in leaf and level Ⅰ root of H.contortus.(3) There was no significant correlation between C content in soil and that in leaves and roots across three plants, whereas C content in level Ⅱ and Ⅲ roots were more stronger positively correlated with that in leaves than level Ⅰ roots.(4) Moreover, N content in leaves except C. distans showed a significantly positive correlation but P content in leaves showed a significantly negative correlation with those in level Ⅰ root across three plants.(5)N content in soil was significantly positively correlated with that in leaves and roots in H. contortus and E. binate,whereas P content in soil was significantly positively correlated with that in leaves but negatively with that in level Ⅰ roots in E. binate and C. distans. In addition, C:N and N:P ratios in soil and leaves were significantly positively correlated only in E. binate, showing stronger correlation between leaves and roots stoichiometric ratios in E.binate than in H. contortus and C. distans. Our study indicates that H. contortus uses the “stress tolerance” survival strategy to adapt to harsh environment by increasing nutrient cycling and root production rate, whereas C.distans and E. binate uses the “competitive” survival strategy with higher resistant to hars
作者
余杭
高若允
杨文嘉
杨柳生
李松阳
林勇明
王道杰
李键
YU Hang;GAO Ruoyun;YANG Wenjia;YANG Liusheng;LI Songyang;LIN Yongming;WANG Daojie;LI Jian(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,China;Key Laboratory of Mountain Hazards and Surface Processes,Chinese Academy of Sciences,Chengdu 610041,China;Key Laboratory For Forest Ecosystem Process and Management of Fujian Province,Fuzhou 350002,China;Institute of Mountain Hazards and Environment,Chinese Academy of Sciences and Ministry of Water Conservancy,Chengdu 610041,China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2022年第3期727-735,共9页
Chinese Journal of Applied and Environmental Biology
基金
国家自然科学基金项目(42071132、41790434)
中国科学院山地灾害与地表过程重点实验室开放基金资助项目(2019)
福建农林大学杰出青年科研人才计划项目(xjq2017016)资助。
