青藏高原不同森林类型叶片、凋落物和土壤碳、氮、磷养分循环特征  

Nutrient cycling of carbon,nitrogen and phosphorus in leaves,litter and soil of different forest types on the Qinghai-Xizang Plateau

作　　者：唐雨欣 王小娜[1] 黄百莹 杨玉婷 周汶宏 吴宇琦[1] 王谢军 姚广前 马海兰 徐当会[1] TANG Yu-xin;WANG Xiao-na;HUANG Bai-ying;YANG Yu-ting;ZHOU Wen-hong;WU Yu-qi;WANG Xie-jun;YAO Guang-qian;MA Hai-lan;XU Dang-hui(State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystem,College of Ecology,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学生态学院,草种创新与草地农业生态系统全国重点实验室,兰州730000

出　　处：《兰州大学学报(自然科学版)》2025年第1期58-64,共7页Journal of Lanzhou University(Natural Sciences)

基　　金：兰州大学2023年研究生“创新之星”项目(2023CXZX-137);国家自然科学基金项目(32171611,32471700);甘肃省自然科学基金项目(22JR5RA454);第二次青藏高原综合科学考察项目(2019QZKK0301)。

摘　　要：选取青藏高原东缘以油松为优势种的天然林、次生林和人工林作为研究对象,测定其植物叶片、凋落物和土壤碳、氮、磷浓度以及化学计量特征.从养分限制的视角分析碳、氮、磷元素在叶片-凋落物-土壤之间的循环过程,判断不同森林类型间的养分受限情况.结果表明,植物叶片、凋落物和土壤w(C)、 w(N)和w(P)以及生态化学计量特征在不同森林类型之间差异显著,植物叶片w(N)、 w(P)变化表现为人工林最高,说明人工林生长速率最快,养分利用效率最低.凋落物中w(C)和碳、氮、磷化学计量比为人工林最低,w(N)、 w(P)为人工林最高,表明人工林凋落物分解速率最快,氮、磷养分回收效率最低.与人工林相比,天然林和次生林植物叶片和土壤w(C)、氮回收效率和磷回收效率更高,植物叶片养分回收效率与土壤养分浓度呈负相关.天然林植物生长受磷限制作用较强,次生林和人工林植物生长受氮限制作用较强.Natural forests,secondary forests and planted forests with Pinus tabuliformis as the dominant species in the eastern margin of Qinghai-Xizang Plateau were selected as the research objects here,and the contents of carbon,nitrogen,phosphorus and stoichiometric characteristics of plant leaves,litter and soil determined.From the perspective of nutrient restriction,the cycle process of C,N and P elements in leaves,litter and soil were analyzed,and the nutrient restriction between different forest types judged.The results showed that w(C),w(N) and w(P) in plant leaves,litter and soil and the ecological stoichiometric characteristics were significantly different between different forest types,and the changes of w(N)and w(P) in plant leaves were the highest,indicating the fastest growth rate and the lowest nutrient use efficiency in plantation.The w(C) and stoichiometric ratio of C,N and P in litter were the lowest in the plantation,while the w(N) and w(P) the highest,indicating that the litter decomposition rate of the plantation was the fastest,and the nutrient recovery efficiency of N and P was lowest.Compared with plantation forest,w(C),N recovery efficiency and P recovery efficiency of plant leaves and soil were higher in natural forest and secondary forest,and nutrient recovery efficiency of plant leaves was negatively correlated with soil nutrient content.The natural forest plant growth is more strongly restricted by P,while the secondary forest and plantation plant growth is more strongly restricted by N.

关 键 词：化学计量特征 森林类型 土壤 养分限制 青藏高原 

分 类 号：Q945.79[生物学—植物学]