【作者】 王鹏飞；

【导师】 赵勇；

【作者基本信息】 河南农业大学 ， 生态学， 2008， 硕士

【摘要】 通过对栓皮栎、刺槐和侧柏的生物量,生产力和养分循环进行为期1年的研究,结果表明:（1）栓皮栎人工林单株生物量和林分生物量均随林龄的增加而增人,20a～40a生林分生物量分别为131.65t/hm²,202.96t/hm²利291.15t/hm2.刺槐和侧柏人工林林分生物量分别为39.87 t/hm2和45.55 t/hm²。栓皮栎乔木层的净生产力随着林分年龄的增加而增大,各器官净生产力最人的是树干,最小的是树叶。刺槐和侧柏各器官中净生产力最大的也是树干,但最小的不一样,刺槐是树叶,侧柏是树皮。20a～40a生栓皮栎人工林年凋落量分别为6776.19kg/hm²、7531.06kg/hm²和8660.26kg/hm²;刺槐人工林年凋落量为5372.34kg/hm²:侧柏人工林年凋落量为7494.71kg/hm²。（2）20a～40a生栓皮栎人工林营养元素的积累量为2764.58kg/hm²～3689.38 kg/hm2;20a～40a生栓皮栎人工林营养元素的年存留量分别为89.88kg-hm^-2.a^-1～138.17kg.hm^-2.a^-1,20a～40a生栓皮栎人工林营养元素的归还量分别为229.80kg.hm^-2.a^-1、262.06 kg.hm^-2.a^-1和246.63kg·hm^-2.a^-1.刺槐和侧柏人工林营养元素的积累量分别为633 . 78kg . hm^-2.a^-1和455.23kg-hm^-2.a^-1,刺槐和侧桕人工林营养元素的年存留量分别为36.15 kg.hm^-2.a^-1和23.27kg-hm^-2.a^-1,刺槐和侧柏人工林营养元素的归还量分别为286.52kg.hm^-2.a^-1和347.12kg.hm^-2.a^-1。林分营养元素的贮存总量随着林龄的增加而增大,吸收量和归还量的变化趋势相一致,均是随着林龄的增加先增加而后减少,存留量随着林龄的增加呈现减小趋势。20年生～40年生栓皮栎人工林二种营养元素贮存量、营养元素吸收量、归还量和存留量大小的排列次序均为:Ca>N>P。（3）栓皮栎养分利用系数随着林龄的增加而减小,营养元素总量的循环系数随着林龄的增加而增大,营养元素总量的周转时间随着林龄增加呈增长趋势。栓皮栎人工林随着林龄增加,早期自身养分利用率低,但其归还速率较快,周转时间短,有利于林地生产力维持,林分到达成熟期养分的周转期长,归还给林地的养分速率有所降低,林木更多地关注自身的生长,更多地消耗林地养分。因此,栓皮栎人工林到达成熟期后要通过人为措施,如采伐利用或加快其演替速度来恢复地带性的稳定群落,以达到维持林地持久的生产力。刺槐和侧柏人:[林的循环系数均在0.8以上,且周转时间较短,说明植物吸收养分元素大部分作为归还量返同土壤,体现了对养分元素的高速循环利用征。更多还原

【Abstract】 The biomass,productivity and nutrient cycling of Quercus Variabilis,Pla tycladus orientalis and Robinia pseucdoacacia were studied in one year period. The results showed that （1）the biomass of Quercus Variabilis plantation（20 to 40 years old） respectively were 131.65t/hm2, 202.96t/hm2 and 291.15t/hm2. The biomass of Robinia pseucdoacacia and Platycladus orientalis were 39.87 t/hm2 a nd 45.55 t/hm2 Net primary productivity of Quercus Variabilis increased with t he increased of their ages.The maximum net primary productivity in organs wa s bole,the minimum was leaves. The maximum net primary productivity in org ans of Platycladus orientalis and Robinia pseucdoacacia was bole also, the mini mum of Robinia pseucdoacacia was leaves,but minimum of Platycladus orientali s was bark.The annual production of litter respectively of Quercus Variabilis were 6776.19kg/hm2 7531.06kg/hm2 and 8660.26kg/hm2. The annual production of litter respectively of Robinia pseucdoacacia was 5372.34kg/hm2, The annual production of litter respectively of Platycladus orientalis was 5372.34kg/hm2.（2）The total accumulation of nutrient element in Quercus Variabilis（20 to 40 years old） was 2764.58kg/hm2～3689.38 kg/hm2.The range of nutrient accumulation in Quercus Variabilis（20 to 40 years old） plantation were 89.88kg.hm^-2.a^-1 138.17kg.m^-2.a^-1.Return of different element of Quercus Variabilis（20 to 40 years old）plantation were 229.80kg.hm^-2.a^-1,262.06 kg-hm^-2.a^-1 and 246.63kg.m^-2.a^-1. The total accumulation of nutrient element in Robinia pseucdoacacia and Platycladus orientalis were 633.78kg.m^-2.a^-1 and 455.23kg.m^-2.a^-1, The range of nutrient accumulation in Robinia pseucdoacacia and Platycladus orientalis were 36.15 kg-hm^-2.a^-1 and 23.27 kg.m^-2.a^-1, Return of different element of Robinia pseucdoacacia and Platycladus orientalis were 286.52kg.m^-2.a^-1 and 347.12 kg.m^-2.a^-1 .The conservation gross increased with the increased of trees age.The regularity of the absorption,return of different element were accordant and all increased with the increased of trees age,then all reduced.The range of nutrient accumulation reduced with the increased of trees age.The top-down model of the conservation,return of different element and the absorption of different element in Quercus Variabilis（20 to 40 years old） was Ca>N>P.（3）The use coefficient of Quercus Variabilis was reduced with the increased of trees age,cycle coefficient was increased with the increased of trees age,turnaround time was increased with the increased of trees age. In early stage stands, nutrient use eficiency in Quercus Variabilis stands was lower but recycling rate Was higher and turnover period Was shorter. Mature stands had a lower nutrient recycling rate and a longer turnover period, so the trees extract more nutrient elements from soil. Hence measures should be taken to facilitate the successional process to reach a stable zonal community . Recycling rate of Platycladus orientalis and Robinia pseucdoacacia were 0.8 and turnaround time was shorter,result showed that plant nutrient absorption as the return of most of return to the soil, embodies the elements of the high-speed nutrient recycling characteristics.更多还原