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Iron is a component of chlorophyll. The activity of iron in leaves has a great correlation with the degree of chlorosis of leaves. At different sampling times, the active Fe of the normal and yellowing trees in Lunan Road North changed greatly (20~49mg·kg-1). The content of active iron in leaves of P. chinensis was lower than that of normal leaves. It was shown that the low content of active iron in leaves was an important physiological cause of yellowing of P. eucalyptus leaves. The content of active iron in the leaves of Luannan was higher than that in Lubei at each sampling period. The activity Fe content of normal Eucalyptus leaves on Lunan Road north gradually increased with the sampling time (from October to August), and the Loessia jasminoides trees showed a trend of increasing first and then decreasing again with sampling time. Lu Nanhuang With the sampling time, L. eucalyptus showed a trend of increasing first and then decreasing, and there was a significant difference between most sampling times.
Through the detection and analysis of eucalyptus leaves by chlorophyll meter, the changes of nutrient contents in leaves of Eucalyptus showed strong regularity during different sampling times. SPAD value, catalase activity, peroxidase activity, total N, total K, total Fe The changes of quantity and activity of Fe content are consistent, both 2007-08>2007-2006>2007-103>2006-10. 2007-08 may have the highest activity with summer tree growth, fast absorption, fast root growth, and root exudates More, at the same time more rainfall related; 2006-10 minimum, which may be long with the autumn shoots, need more nutrition, and the roots are in a slow growing period, the poor ability to absorb nutrients, exacerbating the contradiction between supply and demand of nutrition. The total P content in leaves is opposite to that in 2006-10>2007-08>2007- 03>2007- 06, 2007- 06 The reason for the low phosphorus content may be related to the fact that phosphorus is an important constituent of reproductive organs such as plant species and fruits. Material-related, because this period is precisely fruit development, reproductive growth accelerated, when the consumption of large amounts of nutrients, the tree nutrients need to be redistributed; 2006-10 The higher phosphorus content may be due to the lower temperature during this period, the weakening of root activity, Eucalyptus Physical activity is slow.
Chlorophyll Meter Analysis of Normal and Yellowing Leaves of Eucalyptus
Eucalyptus is a common evergreen tree species. Its tree shape is very beautiful, and it has strong ability to fight diseases and repel insects. It has very strong resistance to sulfur dioxide and ozone. This kind of tree grows more in the south of our country. The growth of eucalyptus is mainly affected by environmental factors such as temperature, light, precipitation and atmospheric humidity. The chlorotic chlorosis of eucalyptus in limestone soil in coastal area of ​​Hangzhou is mainly due to the high soil pH, high HCO3C concentration and low organic matter content, which affects the activation and absorption of iron in soil. Chlorophyll meter has a very important role in detecting the health status of eucalyptus leaves.