The total carbon storage in P.amarus ecosystem was 135.808110 t/ha,of which 46.032 420 t/hm2 in the aboveground arbor,about 33.9%,and 2.600 68t/hm2 in the litter,about 1.91%,and 87.1750t/hm2 in the soil layer(0 ~ 60 cm),accounted for 64.19%.
The capacity of litter interception on rainfall were 6.57t·hm~(-2),5.79t·hm~(-2) and 5.26t·hm~(-2), and the rates of litter interception on rain were 6.22%、5.52% and 5.23%, respectively in the three communities.
The litter fallen from Schina superba and festratum contributed more nutrients to the soil,for example,the amount of N,P,K,Ca,Mg,Mn,Cu,Zn was 14 08,2 50,14 05,18 41,1 01,0 505 0,0 006 5 and 0 019 3 kg·hm -2 respectively more than that of check.
The results showed that the amount of litter layer is natural evergreen broadleaved forest(25.68 t/hm~2)>Metasequoia glyptostroboides forest(18.14 t/hm~2)>Sassafras tzumu forest(9.95 t/hm~2)>Cryptomeria fortunei forest(1.13 t/hm~2).
The test measured in 2004 shows that the average depth of moss and litter in the sample plot is about 9.7 cm,the total precipitation is 178.7 mm,and the water-cut mass is 57.8 mm,accounting for(32.34%) of atmospheric precipitation.
Laboratory experiments were adopted to study the characteristics of three kinds of forest litters( Pinus tabulaeformis, Robinia pseudoacacia and Vitex negundo var. heterophylla )in intercepting rainfall and retarding surface runoff under different conditions.
The precipitation, the throughfall, the stemflow, the litter form and the soil interception are measured in Lianxiahe Watershed of Three Gorges Reservoir Area in 2004, the results show that the throughfall is 76.70%, the canopy interception (23.03%), and the stemflow 0.27% of total of precipitation.
Nutrient dynamics of foliar litter in reciprocal decomposition in tropical and subtropical forests
In order to explore the release of nutrients and the effects of global warming on the decomposition rate of forest litter, an experiment is designed to reciprocally decompose forest foliar litter in two sites across climatic zones: Mt.
Foliar litters of 10 native dominant tree species have been collected respectively from the two sites and divided into single-species litter and mixed litter.
The results indicate that litter decomposes in the tropical site 1.36-3.06 times more rapidly than in the subtropical site.
Dinghushan in the first year's litter decomposition under the prevailing temperature condition.