Absorption, Accumulation and Exchange of Metal Elements in Areca of Plants in the Central Area of ​​Hainan Island

2 Haiyan Normal University, Haikou 571168, soil analysis of the relevant laws, data processing using Altos - 8600 type computer to calculate its value.

3 Results and analysis 3.1 Absorption of metal elements in Areca plants in the same area of ​​origin The selected absorption of the metal elements in the plants and the accumulation status of the organs are different 141. The results of selective absorption of 6 metal elements in the betel nut plants in the experimental area are listed in the table. 1. Table 1 Middle North Low Valleys Chess Willow Absorption Metal Element Value Settlement Origin Number of Samples Total Bay Ridge Valley (I Wushi Valley Camp Valley (I) Average (X)~) Natural Conditions (Formed Soil Parent Material, Climate) ) Similar; the data in the table is the average of three measurements, the same below.

From the measured data in Table 1, it can be seen that the betel nut plants have different absorption values ​​for metal elements. The results of the test area indicated that the average contents of the six metal elements in Areca palm plants tend to be Al>Zn 3.2. Dynamic analysis of the absorption and accumulation of metal elements in different varieties of Areca agriculata The intrinsic choice of the absorption and accumulation of the metallic elements and the elements in the soil are different. The intrinsic selective absorption coefficient (Ax) value of the plant is usually expressed as the ratio of the element content level in the plant to the element content in the soil.

From the data in Table 2, it can be seen that different varieties of betel nut grow under different natural conditions, and their bio-absorption coefficient (Ax) is higher than that of Areca nut and Betel nut in Thailand. Among them, the intrinsic selectivity of six kinds of metallic elements of the betel nut in Hainan was accumulated and accumulated in the range of (1) 1.54 to 91.65 Ax values ​​to Mo maximum (0.873), Zn dimensions (0.711), and Pb minimum (0.096), as well as their values. Little difference. The variation range of Ax value of Yunnan betel nut is 730, and the order of Ax value is the same as that of Yunnan betel nut.

According to the above comparative analysis, the differences in the Ax values ​​of different varieties of betel nut are related to the physiological function of the species, the availability of the elements to the plants, the pH of the soil, the antagonism and coordination between the elements, in addition to the levels of the metal elements in the environment. Effects, as well as ecological factors (light, temperature, humidity, etc.) influence. For example, Al is difficult to migrate in the soil and is more easily absorbed by the betel nut plants, so the content of Al in betel nut is higher than that of Zn, Cu, Ni, Mo, and Pb, but Pb is the opposite, in dry and wet differentiation and leaching. In a strong environment, it is easy to migrate and lose, and it is not easily absorbed and accumulated by the betel nut plants, so it directly affects the content of plant components.

3.3 The accumulation of metal elements in different parts of the betel nut species The metal elements in the plant mainly come from the soil. The elements that are absorbed by the roots are first accumulated in the roots of the plants and then transferred to other parts of the plant body. In different parts, the accumulation of metal elements is not the same. In general, the content of elements in plants is represented by the above-ground organs (stems, leaves, and fruits). The measured values ​​in Table 3 reflect the significant differences in the five metal element contents in different (site) organs of the same species. It usually shows that the accumulation of elements in fruits and leaves is higher than that in stems. For example, the leaf content of Hainan betel nut is significantly higher than that of fruit and stem. Compared with leaves, fruits and stems, the average value is 11. Bu-6-inch-inch=u thief, R SO-bub9-bu inch-a-zl inch-6-Table 3 grows in the same habitat different types of chess willow Different parts of the metal elements set value (ug.g-1) n = 4 variety of organ totals betel nut stems and leaves fruit Thailand betel nut (B) stems and leaves fruit Table 3 also shows that the five different metals in different organs of betel nut average variation The range, (A) is 3.4 Soil-plant metal system Absorption Accumulation and exchange The plant contains elements mainly derived from the soil, especially depending on the size of the range of available soil elements, so the soil is a component of the plant system. The exchange role has a wide range of practical significance. 1451. The authors used quantitative analysis methods in each experimental area to study the exchange of six metal elements of different types of betel nut and soil components, elements and environmental conditions. Table 4.

From the data measured in Table 4, it can be seen that due to the differences in habitat conditions and levels of elements between different species of betel nut, the active absorption of metal elements by plants or passive absorption and accumulation due to the ionic activity is a common trend. The general trend is betel nut in Hainan Island. Higher than Yunnan betel nut and Thai betel nut. The amount of six kinds of metal elements produced in the north-central valley of Hainan's betel nut was higher than that of the southeastern mountainous area and the southwestern low hill; the southeastern part of the betel nut was the highest in Thailand, followed by the middle-northern valley and the southwest. Part of the low hill yield again; Yunnan betel nut absorption and accumulation of the same size and the betel nut in Hainan.

Acknowledgments: The field survey sampling work of this study was helped by Zeng Liangsheng and Zheng Jue, and some of the tests were also supported by Comrade Wu Guoquan of Hainan Institute of Tropical Crops.