Study On Litter Nutrient Return And The Effect Of Fertilization In Bambusa Pervariabilis×Dendrocalamopsis Daii Pulpwood Timber

At present, Bambusa pervariabilis×Dendrocalamopsis daii has become an important pulp timber bamboo species have been large areas of planting. litter material recycling and Effects of fertilization research on Bambusa pervariabilis×Dendrocalamopsis daii pulp production increased and sustainable forest management has an important guiding significance.From May 2008, Effects of fertilization and litter material recycling have been carried out. Studies to Bambusa pervariabilis×Dendrocalamopsis pulp plantation litter have shown that:The annual litter production of Bambusa pervariabilis×Dendrocalamopsis pulp-paper timber forests was 5004.69kg/hm~2.There were two valley in the whole year,highest in March and June,the lowest in December.The annual element return to the siol through litter were 1070.99 kg/hm~2,38.26kg/hm~2,2.6kg/hm~2,5.16kg/hm~2respectively,the sequence of nutrient retrun was C>N>K>P.Leaf was the main components of nutrient return.The nutrient return of leaf was higher in spring and summer than in autumn and winter.The decay rate was in sequence of leaf>sheath>root>twig>butt,The decay rate of leaf was the fastest than any other components,declining were 3.89a, the decay rate of butt was the slowest, declining were 12.53a. After a year the release of nutrients in litter decomposition volume is Organic carbon 618.11kg/hm~2,N11.46kg/hm~2,P0.07kg/hm~2,K3.39kg/hm~2. The overall performance ofN,P is enrich.K is direct loss.The application of fertilizer to Bambusa pervariabilis×Dendrocalamopsis daii pulpwood timber with "3414" three-factor quadratic regression orthogonal design optimization, set up Bambusa pervariabilis×Dendrocalamopsis daii at high fertilizer and low fertilizer zone's yield and N, P, K fertilizer among the fertilizer model. Statistical analysis indicates that: Nitrogen is the dominant factor affecting Bambusa pervariabilis×Dendrocalamopsis daii production,and there is a positive interaction between N and K to certain extent. The set of N, P, K fertilizer levels of 0 ~ 3, the range of fertilizer effect function under the premise of law principle, can be obtained fertilizing amount by Frequency analysis: High fertilizer Area N14.97kg/667㎡,P2O5 2.648kg/667㎡,K2O9.414kg/667㎡; Low-fat area N15.6kg/667㎡,P2O52.425kg/667㎡,K2O9.3kg/667㎡.