Carbon, Nitrogen and Phosphorus Contents and Their Ecological Stoichiometry Characteristics in Leaves of Casuarina equisetifolia and Ipomoea pes-caprae in the Coastal Zone of Hainan Island

doi:10.7525/j.issn.1673-5102.2020.02.009

Abstract

Abstract: The experiment was conducted to study the stoichiometry characteristics of the plant leaves and their influencing factors for improving the ecological environment of the coastal zone. The Casuarina equisetifolia and the Ipomoea pes-caprae on the nearby beaches of 12 cities(counties) along the coast of Hainan Island were selected as research objects. The stoichiometry characteristics and differences of C, N and P in the leaves of two plants were analyzed to explore the different environmental factors by measuring the contents of carbon(C), nitrogen(N) and phosphorus(P) in leaves of C.equisetifolia and I.pes-caprae. And the effects of C, N, P content, C:N, C:P and N:P on the leaves of the two plants were conducted. These could find the main limiting factors affecting the growth of coastal zone plants. The results showed that the average contents of C, N and P in leaves of C.equisetifolia in Hainan Island were 399.06±20.29, 12.55±1.03, 12.55±1.03 g·kg^-1, respectively. The ratios of C:N, C:P and N:P were 32.02±2.8, 420.65±121.27 and 13.10±3.47, respectively. The average contents of C, N and P in leaves of I.pes-caprae were 364.31±30.20, 12.84±1.96 and 2.06±0.64 g·kg^-1, respectively. The ratios of C:N, C:P and N:P were 29.13±4.95, 198.74±79.41 and 6.92±2.69, respectively. The N content in leaves of C.equisetifolia was significantly correlated with annual mean temperature(AMT) and annual mean precipitation(AMP). The P content in leaves of C.equisetifolia was significantly positive correlated with AMP. The C:P and N:P in leaves of C.equisetifolia were significantly negatively correlated with AMP. There was a significantly positive correlation between C content in leaves of I.pes-caprae and AMT. The C:N of I.pes-caprae leaves showed a significantly negative correlation with AMP. The N content in leaves of C.equisetifolia was significantly negatively correlated with the SOC of the soil at the depth of 10-20 cm. C:N was significantly correlated with the SOC of the soil at the depth of 10-20 cm. C:P was significantly correlated with C:N of the soil at the depth of 0-10 cm. The C content in leaves of I.pes-caprae was significantly negatively correlated with the SOC of the soil at the depth of 10-20 cm. The P content were significantly correlated with the TN content, N:P of the soil at the depth of 0-10 cm, and the SOC of the soil at the depth of 10-20 cm. C:N was significantly correlated with C:N of the soil at the depth of 0-10 cm. C:P was significantly negatively correlated with TN content of the soil at the depth of 0-10 cm. C:P was significantly correlated with C:N of the soil at the depth of 0-10 cm. N:P was significantly negatively correlated with TN content of the soil at the depth of 0-10 cm. The results show that the carbon and nitrogen contents of the leaves are low in the coastal zone of Hainan Island, and N may be the main factor affecting plant growth in this area. At the same time, vegetation growth is affected by the AMT and AMP. Vegetation growth was less affected by soil nutrient content. The environment factors have differently effects on different plants.

Key words: Casuarina equisetifolia, Ipomoea pes-caprae, leaves, ecological stoichiometry

CLC Number:

S792.93

ZHANG Shu-Qi, XU Quan, YAO Hai-Rong, YANG Qiu, LIU Wen-Jie, WANG Meng. Carbon, Nitrogen and Phosphorus Contents and Their Ecological Stoichiometry Characteristics in Leaves of Casuarina equisetifolia and Ipomoea pes-caprae in the Coastal Zone of Hainan Island[J]. Bulletin of Botanical Research, 2020, 40(2): 224-232.

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