Abstract:
ObjectivesOld pine and old cypress trees are important parts of old trees in Shanghai. Soil fertility conditions affect growth of old pine and old cypress trees. This paper studied soil characteristics in fields of old pine and old cypress trees, and analyzed the effects on the growth for providing a theoretical basis of soil management of the old trees.
MethodsSoil physical, chemical properties (soil bulk density, porosity, pH and EC) and soil nutrient contents (include soil organic matter, alkali hydrolysable N and available P, K, Ca, Mg, Fe and Zn) were determined. The relationship between the growth of old pine and old cypress trees and soil fertility was evaluated.
ResultsThe soil pH was from neutrality to alkali, the contents of soil soluble salt were at a suitable level, the contents of soil organic matter were higher, the supply of available N was higher, the supply of available K was sufficient and the supply of available P was lower, and the contents of calcium, magnesium, iron and zinc in the soils were stable. The growth of the pine and cypress trees was influenced by the root mycorrhizal infection rate. The growth of the pine and cypress trees was also related to soil physical and chemical properties, and was positively correlated with the soil porosity.
ConclusionsThere were higher values in the soil bulk density and lower in soil aeration porosity, and the soil air permeability was weak. We proposed to improve the mycorrhizal infection rate and soil aeration porosity, provide sufficient organic matter and reduce soil bulk density in the process of actual protection of old pine and cypress trees.
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