Wu Shan-Wei, Shi Zhao-Yong, Huang Ming, Yang Shuang, Yang Wen-Ya, Li You-Jun
College of Agriculture, Henan University of Science and Technology, Luoyang 471023, China.
Luoyang Key Laboratory of Symbiotic Microorganism and Green Development, Luoyang 471023, China.
J Fungi (Basel). 2023 May 18;9(5):588. doi: 10.3390/jof9050588.
Senesced leaves play a vital role in nutrient cycles in the terrestrial ecosystem. The carbon (C), nitrogen (N) and phosphorus (P) stoichiometries in senesced leaves have been reported, which are influenced by biotic and abiotic factors, such as climate variables and plant functional groups. It is well known that mycorrhizal types are one of the most important functional characteristics of plants that affect leaf C:N:P stoichiometry. While green leaves' traits have been widely reported based on the different mycorrhiza types, the senesced leaves' C:N:P stoichiometries among mycorrhizal types are rarely investigated. Here, the patterns in senesced leaves' C:N:P stoichiometry among plants associated with arbuscular mycorrhizal (AM), ectomycorrhizal (ECM), or AM + ECM fungi were explored. Overall, the senesced leaves' C, with 446.8 mg/g in AM plants, was significantly lower than that in AM + ECM and ECM species, being 493.1 and 501.4 mg/g, respectively, which was mainly caused by boreal biomes. The 8.9 mg/g senesced leaves' N in ECM plants was significantly lower than in AM (10.4 mg/g) or AM + ECM taxa (10.9 mg/g). Meanwhile, the senesced leaves' P presented no difference in plant associations with AM, AM + ECM and ECM. The senesced leaves' C and N presented contrary trends with the changes in mean annual temperature (MAT) and mean annual precipitation (MAP) in ECM or AM + ECM plants. The differences in senesced leaves' C and N may be more easily influenced by the plant mycorrhizal types, but not P and stoichiometric ratios of C, N and P. Our results suggest that senesced leaves' C:N:P stoichiometries depend on mycorrhizal types, which supports the hypothesis that mycorrhizal type is linked to the evolution of carbon-nutrient cycle interactions in the ecosystem.
衰老叶片在陆地生态系统的养分循环中起着至关重要的作用。已有关于衰老叶片中碳（C）、氮（N）和磷（P）化学计量比的报道，这些化学计量比受生物和非生物因素影响，如气候变量和植物功能群。众所周知，菌根类型是影响叶片C:N:P化学计量比的植物最重要的功能特征之一。虽然基于不同菌根类型对绿叶性状已有广泛报道，但很少研究不同菌根类型之间衰老叶片的C:N:P化学计量比。在此，我们探究了与丛枝菌根（AM）、外生菌根（ECM）或AM+ECM真菌相关的植物衰老叶片C:N:P化学计量比的模式。总体而言，AM植物衰老叶片的碳含量为446.8毫克/克，显著低于AM+ECM和ECM物种，后两者分别为493.1毫克/克和501.4毫克/克，这主要是由北方生物群落造成的。ECM植物衰老叶片的氮含量为8.9毫克/克，显著低于AM（10.4毫克/克）或AM+ECM类群（10.9毫克/克）。同时，衰老叶片的磷在与AM、AM+ECM和ECM相关的植物中没有差异。在ECM或AM+ECM植物中，衰老叶片的碳和氮随年均温度（MAT）和年降水量（MAP）的变化呈现相反趋势。衰老叶片碳和氮的差异可能更容易受植物菌根类型影响，而不是磷以及碳、氮和磷的化学计量比。我们的结果表明，衰老叶片的C:N:P化学计量比取决于菌根类型，这支持了菌根类型与生态系统中碳养分循环相互作用的进化相关的假设。
