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《Journal of Northwest Forestry University》 2016-04
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Correlation Analysis on Sunshine Hours and Effective Grown-up Seedling of Pinus tabulaeformis by Aerial Seeding in Hanzhong

ZHANG Bin-shan;LI Jian-chun;KONG Lu-yu;HAN Chong-xuan;Northwest A&F University;Hanzhong Station of Forest Pest Management;Shannxi Work Station of Afforestation by Aerial Seeding;  
As a major climatic resource,sunlight decides existential state and distribution of the forest waterheat resource,and further influences the effective grown-up seedling of afforestation by aerial seeding.Previously,based on the data of the aerial seeding of Pinus tabulaeformis in Hanzhong in 1997,we reported the relationships between the effective grown-up seedling and precipitation,as well as temperature.In this paper,we analyzed the relationship between he effective grown-up seedlings and sunshine factors.The results showed that the effective grown-up seedlings were very significantly and positively correlated to theannual sunshine hours and the annual precipitation,and significantly and positively correlated to annual average temperature.Correlations between the effective grown-up seedling and the sunshine,the temperature and the rainfall exhibited obvious seasonal variations.The sunshine and the temperature that were correlated with the effective grown-up seedling presented the same correlation trends,and reversed to precipitation.In winter,the effective grown-up seedling was positively correlated to the sunshine and the temperature of December and February,negatively correlated to the sunshine and temperature of January,and most significantly and negatively correlated to the monthly precipitation in a year.In spring,the effective grown-up seedling was significantly or very significantly and negatively correlated to the sunshine and the temperature of March and May,significantly and positively correlated to the sunshine and temperature of April,and most significantly and positively correlated to the monthly precipitation.In summer,the effective grown-up seedling was negatively correlated to the sunshine,temperature and precipitation of June,in which the correlations to temperature and the precipitation were significant,most significantly correlated to the sunshine and temperature in July,most significantly and negatively correlated to the precipitation,of July,and significantly(or most significantly)and positively correlated to the sunshine,temperature and precipitation of August.In autumn,the effective grown-up seedling was positively correlated to the sunshine and temperature,negatively correlated to the precipitation with different levels in each month.Without considering the impact of time,close correlations were found between the effective grown-up seedling and sunshine of June,August,September,and December sunshine in control area,while the sunshine of April,May,November,December,September,and February was strong associated with the effective grown-up seedling by using RPA.The mean temperature of April and November had a stronger influence on the effective grownup seedling in control area and the quantity of available seedling in RPA application area,the mean temperature of April and the annual extreme maximum temperature were closely correlated to the frequentness of the sampling plots with available seedling in RPA.The May and February precipitations were strongly correlated to the effective grown-up seedling in control area and the quantity of available seedling in RPA area,the July,September and December rainfalls had a stronger role for the quantity of available seedling in RPA area.Considering time factor,the model relationship between the effective grown-up seedling and the monthly mean temperature unchanged.The May sunshine and precipitation were key factors affecting the effective grown-up seedling.
【Fund】: 国家林业公益性行业专项(201404405);; 国家林业局重点项目(2012-02)
【CateGory Index】: S791.254
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