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Open AccessArticle

Ecological Stoichiometric Characteristics of Two Typical Plantations in the Karst Ecosystem of Southwestern China

by Danbo Pang 1,2, Genzhu Wang 1,2, Guijing Li 1,2, Yonglei Sun 1,2, Yuguo Liu 3 and Jinxing Zhou 1,2,*
1
Jianshui Research Station, School of Soil and Water Conservation, Beijing Forestry University, No. 35 Qinghua East Road, Haidian District, Beijing 100083, China
2
Key Laboratory of State Forestry Administration on Soil and Water Conservation, Beijing Forestry University, No. 35 Qinghua East Road, Haidian District, Beijing 100083, China
3
Institute of Desertification Studies, Chinese Academy of Forestry, No. 1 Dong Xiao Fu, Xiangshan Road, Haidian District, Beijing 100091, China
*
Author to whom correspondence should be addressed.
Forests 2018, 9(2), 56; https://doi.org/10.3390/f9020056
Received: 9 December 2017 / Revised: 12 January 2018 / Accepted: 19 January 2018 / Published: 25 January 2018
(This article belongs to the Special Issue Nutrient Dynamics of Planted Forests)
Reforestation has been widely adopted to restore soil fertility and ecosystem service function in the rocky desertification region of southwestern China. However, there has been limited research concerning the stoichiometry of carbon (C), nitrogen (N), and phosphorus (P) and nutrient resorption rate of plantations in karst ecosystems. In this study, we selected plantations of Pinus yunnanensis Franch. (PY) and Eucalyptus maideni F. Muell. (EM) in Yunnan Province. The C, N, and P concentrations and the C:N:P stoichiometry in different soil layers (0–10 cm, 10–20 cm, and 20–30 cm) were examined. The nutrient limitation and nutrient resorption efficiency were also analyzed. The leaf C and N concentrations in the PY plantation were higher than that in the EM plantation; the P concentration demonstrated the opposite trend, both in green and senesced leaves. Soil C, N, and P concentrations in the EM plantation were much greater than in the PY plantation at all three depths and decreased with the depth of the soil. In addition, the high ratios of C:P, N:P, C:Available P, and N:Available P in soil coupled with the ratios of N:P in leaves indicate that the EM plantation has a greater P deficiency than the PY plantation. In the EM plantation, the relatively low P concentrations in senesced leaves indicates efficient TP (Total phosphorus) resorption, which highlights that the high reuse proficiency of P could have favored moderating P limitation in the karst ecosystem. This research aids in understanding the stoichiometric characteristics that mediate forest properties, and provides a basis for management of vegetation in karst ecosystems. View Full-Text
Keywords: vegetation restoration; stoichiometric; N:P ratio; nutrient limitation; nutrient resorption; karst ecosystem vegetation restoration; stoichiometric; N:P ratio; nutrient limitation; nutrient resorption; karst ecosystem
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Pang, D.; Wang, G.; Li, G.; Sun, Y.; Liu, Y.; Zhou, J. Ecological Stoichiometric Characteristics of Two Typical Plantations in the Karst Ecosystem of Southwestern China. Forests 2018, 9, 56.

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