Response of C, N, and P stoichiometry characteristics of Broussonetia papyrifera to altitude gradients and soil nutrient
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Response of C, N, and P stoichiometry characteristics of Broussonetia papyrifera to altitude gradients and soil nutrients in the karst rocky ecosystem, SW China Qijuan Hu & Maoyin Sheng Hailong Xiao
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Yixin Bai & Yin Jie &
Received: 31 December 2019 / Accepted: 14 October 2020 # Springer Nature Switzerland AG 2020
Abstract Background and aims The ecological stoichiometry of forest ecosystem has rapidly increased in recent years, but studies on C, N, P stoichiometric characteristics of plant fine root-leaf-litter-soil continuum are very weak and the coupling relationships between underground and aboveground ecosystems are urgently to be studied, especially in the kart rocky desertification ecosystem of Southwest China. The aims of the present study is to clarify the response of C, N, and P stoichiometric characteristics of Broussonetia papyrifera to altitude gradients and soil nutrients in the karst rocky ecosystem and conclude the adaptative strategies of B. papyrifera to the karst rocky desertification environments. Methods Six sampling zones of B. papyrifera were set between the altitude gradient of 500–1100 m in the study area for random sampling. The organic carbon
Responsible Editor: Alfonso Escudero Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11104-020-04742-7) contains supplementary material, which is available to authorized users. Q. Hu : M. Sheng (*) : Y. Bai : Y. Jie : H. Xiao National Engineering Research Centre for Karst Rocky Desertification Control, Guizhou Normal University, Guiyang 550001, People’s Republic of China e-mail: [email protected] M. Sheng Guizhou Engineering Laboratory for Karst Rocky Desertification Control and Derivative Industry, Guiyang 550001, People’s Republic of China
(C), total nitrogen (N), and total phosphorus (P) contents of B. papyrifera fine root, leaf, litter, and rhizosphere soil were determined, respectively. Data were analyzed statistically by linear regression, Pearson correlation analysis, LSD multiple comparison and principal component analysis. Results There are significant positive correlations between N and P contents in fine root, litter, and rhizosphere soil. The nutrient contents and ratios of fine root and litter were the key indexes to evaluate the stoichiometric characteristics of B. papyrifera continuum. Altitude can significantly influence on nutrient contents and stoichiometric ratios of B. papyrifera fine root, leaf, litter and soil. N resorption efficiency of B. papyrifera decreased significantly when altitude increased, and the P resorption efficiency of high altitude plants was lower than that of low altitude plants. Moreover, there were significant correlations between nutrient contents and ratios in B. papyrifera fine root, leaf, litter and rhizosphere soil. Conclusions The B. papyrifera growth in the karst rocky desertification ecosystem of Southwest China was mainly restricted by P element. Rhizosphere soil P content was the most significant factor in the leading to the change of
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