Soil Gravel Content In Camellia Woodland Effects On The Economic Characteristics Of Tea Fruit

Camellia oleifera is a unique woody edible oil tree species in China,It is widely cultivated in red soil area of south China.Site conditions have an important impact on the growth and development of oil-tea.According to the experience of people in oil-tea producing areas,compared with sandy and gravelly soil,oil-tea growing in sandy and gravelly soil has low fruit yield but high fruit oil content.Therefore,through field investigation and pot experiment,this paper explored the influence of soil gravel content on the economic characteristics and fatty acid content of camellia oleifera fruit,and studied the physical and chemical properties of soil with different sand gravel content,in order to explore its influence mechanism,and thus to provide scientific basis for site selection and soil management of camellia oleifera.(1)The water content of the gravelly soil in the oil-tea forest land was significantly lower than that in the gravelly soil.Differential forest land much less gravel in the two soils in 20 cm,40 cm soil total nitrogen con'tent were significant differences,40 cm soil ammonium nitrogen,total potassium and available potassium content exist significant differences,Differences in the specific performance for gravel soils 20 cm,40 cm soil layer soil total nitrogen content,40 cm soil ammonium nitrogen,Soil total potassium content was significantly lower than less gravel content in the soil.The content of available potassium in sandy gravel soil was significantly higher than that in sandy gravel soil.The content of rapidly available phosphorus in the soil with less gravel in the 40cm layer was significantly higher than that in the soil with more gravel.(2)There were significant differences in seed content,Transverse and longitudinal diameter,Fresh fruit weight and seed water content between the two soils.The measured values of fresh fruit seed content,cross diameter,fresh fruit weight,and water content of tea seed in gravelly soil were significantly lower than those in less gravelly soil.The longitudinal diameter of tea fruit grown in less gravelly soil was significantly lower than that measured in more gravelly soil.(3)There were significant differences in the oil content of tea seed,Saturated fatty acid and palmitic acid content in tea oil between the two types of soil with more gravel,And the transverse diameter and single fruit weight of tea seed in the soil with less gravel were significantly higher than those in the soil with more gravel.The content of palmitic acid in tea oil was significantly lower than that in gravelly soil.There was a significant correlation between soil water content and oleic acid,linoleic acid and stearic acid in tea oil.There was a significant negative correlation between fruit characters and fatty acid composition of tea oil.(4)Among all the soil physical and chemical properties measured in this experiment,The soil moisture content in the soil layer of 20cm and the content of available phosphorus in the soil layer of 40cm have significant effects on the economic properties of camellia oleiformis.There was a significant positive correlation between the content of available p in the 40cm soil layer and the cross diameter and single fruit weight of tea fruit,And a significant negative correlation between the content of available p in the soil and the content of saturated fatty acids and palmitic acid in tea oil.Fatty acids also interact with each other in the conversion process.There is a significant negative correlation between the content of oleic acid,Linoleic acid and palmitic acid in tea oil,And an extremely significant positive correlation between the content of oleic acid and stearic acid.The contents of linoleic acid and palmitic acid were positively correlated,and stearic acid and palmitic acid were negatively correlated.