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生物归还是森林生态系统中物流和能流过程中的一环 ,对于快速育林具有极为重要的意义。马尾松Ⅰ类主产区枯枝落叶量 1年可达约 50 0 0kg/hm2 ,枯落物中以落叶所占比例最大 ,达75%～ 89% ,枯枝最少。不同时期枯落物多少差异较大 ,但枯枝差别较小 ;落叶每年 1 0月至次年2月间占总落叶量的 60 %多 ,花杂在 4～ 6月最多 ,均极显著差别于其它各个时期。施肥具有显著增加或减少枯落物量的作用 ,其中施N2 P2 K可显著减少落叶量 ,施P3 、N1 P1 、N2 可显著增加花杂量。然而施肥并未显著改变归还的营养元素量。 1年内归还的养分中 (平均值 )N为3 5.0 7kg/hm2 、P为 1 .77kg/hm2 、K为 6.3 6kg/hm2 、Ca为 1 8.3 0kg/hm2 、Mg为 6.99kg/hm2 。各类枯落物中枯枝归还的营养元素量最少 ,落叶最多 ,占归还元素总量的 80 .8%～ 87.6%。
Bioremediation is a part of the process of logistics and energy flow in forest ecosystem, which is of great importance to rapid forestation. The main littoral area of Pinus massoniana I could reach about 50 0 0kg / hm 2 litter in one year, and litter accounted for the largest proportion of deciduous leaves, reaching 75% -89% with the least litterfall. The differences of litter in different periods were quite different, but the differences of litter were smaller. The deciduous leaves accounted for more than 60% of the total deciduous leaves from January to February in each year, and the flowers were mostly in April to June, In other times. Fertilization could significantly increase or decrease the amount of litter, in which application of N2 P2 K could significantly reduce the amount of deciduous leaves. Application of P3, N1 P1 and N2 significantly increased the amount of flower. However fertilization did not significantly change the amount of nutrients returned. The average nutrient content returned within 1 year was 3 5.0 7 kg / hm 2, P 1.77 kg / hm 2, K 6.3 6.3 kg / hm 2, Ca 8.33 kg / hm 2, and Mg 6.99 kg / hm 2. The litter of all kinds of litter return the least amount of nutrients, the largest number of leaves, accounting for 80.8% of the total return of elements to 87.6%.