Growth Difference of Castanopsis fissa under Different Site Conditions
The afforestation experiment of Castanopsis fissa was carried out under the site conditions of dif-ferent altitude,different slope position,different slope aspect,different slope shape and different slope.By analyzing the growth of 4-year-old Castanopsis fissa stand,the site conditions suitable for the growth of Castanopsis fissa were studied in eastern Guangdong.The results showed that different altitude gradients had significant effects on the growth of Castanopsis fissa,which was the best when the altitude was less than 100 m;with the elevation of slope,the height,DBH and crown width of Castanopsis fissa decreased gradu-ally,and the best growth was in the downhill;the growth of Castanopsis fissa on the northeast slope and the north slope was obviously better than that on the south slope;the height,DBH and crown width of Castan-opsis fissa in valley were significantly higher than those in ridge;when the slope gradient was less than 40°,the growth of Castanopsis fissa was better,and when the slope gradient was greater than 40°,the growth was worse.To sum up,site conditions with altitude less than 100 m,downhill,shady slope,valley and slope gradient less than 40° should be selected for afforestation of Castanopsis fissa in eastern Guangdong.
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