Research on the Effect of Litter on the Nutrient Characteristics in Chinese Fir Plantation

In order to study the cultivation nutrition of Chinese fir plantation systematically,12 sample plots were selected from different stands in its central producing area, Shunchang County of Fujian Province.The sample plots were arranged based on the site index order of 18,16,14 index class with the stand age order of 5,10,15,19 years.The research results are showed as follows:(1)The litter of Chinese fir includes the fallen and no-fallen dry branches and leaves,the function of no-fallen part could not be ignored in Chinese fir stand.(2)The accumulation of fallen branches and leaves will increase with the stand age and site index.But it is very small in 5-year and 10-year stands,and very big in the stand after 15 years.Meanwhile,it increases along with the decrease of site index.(3)The total nutrient content of Chinese fir litter enhances following the increase of site index;but it has no obvious change in the stands at different ages.(4)The nutrient accumulation of Chinese fir litter(including fallen and no-fallen leaves and branches)increases with the raise of site index.Changing with the stand ages,it will be at the highest point in the stands at age 10,and then increases with the stand age.Among them,the nutrient accumulation in no-fallen litter has the same situation,and it plays a very important role in total litter,that is one of Chinese fir characteristics.But the nutrient accumulation in fallen litter increases constantly with the stand age,and increase along with the raise of site index at the age of 10.