Abstract
This study selected typical needle and broadleaved subtropical forests( camphor and pinus massoniana mixed forests) as the research object; from 2009 to 2011 the litter fall was investigated monthly. The results showed that the annual litterfall production was( 4634. 723±337. 1427) kg / hm2,and foliage accounted for 71.78% branches( 26. 24%) litter debris( 8. 46%) fruits( 3. 23%). The total amount of litterfall had the obvious monthly dynamic. In November,its maximum was 1025. 6 kg / hm2; the minimum appears in February which was 138. 606 kg/hm2. There were significant differences of macroelemens and microelements in mixed forest. The order of the macroelemens was CNCaKSMgP, as the microelement was MnFeZnPbCdCuNiCo. The features of C / N was: the branch( 66. 96%) fruit( 63. 48%) leaf( 40. 62%). The content of litter nutrient directly determines the amount of nutrients return in forest. The amount of litter nutrients return was 80. 936 kg / hm2in Camphor and pinus massoniana mixed forest. The features of litter nutrients return of each element size sequence was: N Ca K S Mg P Mn Fe Zn Pb Cd Cu Ni Co. The characteristics of various components of the nutrients return was: leaf( 67. 469 kg / hm2) branch( 14.928kg/hm2) fruit( 2.361 kg/hm2). The amount of N return in mixed forest was 40. 964 kg/hm2. Among this,the return amount of N in leaf had a value of 34. 877 kg / hm2.
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