【摘要】 本文以川北低山暴雨区水土流失定位观测站内的3个不同植被恢复模式为研究对象,通过野外调查与室内实验相结合的方法,对湿地松纯林,刺槐纯林及湿地松刺槐混交林生态系统内生物量及各器官磷素分配格局进行了分析,研究表明:1、3种不同植被类型林分生物量大小顺序为湿地松纯林>混交林>刺槐纯林,在生物量组成上,均为乔木层生物量大于灌木层及层间植物的生物量;2混交林中湿地松和刺槐的树叶、树皮及刺槐果的磷素含量分别大于纯林中的对应器官的磷素含量,湿地松纯林和混交林中枝的磷素含量分别是0.261 g.kg-1和0.264 g.kg-1,而刺槐树枝的磷素含量在纯林和混交林中分别为0.454 g.kg-1和0.348 g.kg-1;混交林中林分总磷素含量大于湿地松林分磷素含量而小于刺槐林分磷素含量,其乔木层和灌木层中的磷素含量的大小顺序与林分磷素总含量一致。更多还原

【Abstract】 This paper takes three different vegetation restoration patterns as the object of studies,and adopts field investigation and the laboratory experimenu to analyse the biomass and phosphorus element assignment patterns in various organs of pure Pinus elliottii crop,pure Robinia pseudoacacia crop and mixed Pinus elliottii and Robinia pseudoacacia stand.The results have shown that the biomass size order of three vegetation types is the Pinus elliottii > the mixed forest > the locust tree.In the biomass composition,the tree level biomass is bigger than the bush level and the level between the tree levels.In the mixed forest,the phosphorus element content in Pinus elliottii leaf,locust tree leaf and bark and locust tree fruit is bigger than that in the corresponding organs of pure stand,in pure Pinus elliottii crop and the mixed forest,the phosphorus element content is 0.261 g·kg-1 and 0.264 g·kg-1 respectively.But the locust tree branch’s phosphorus element content in the pure crop and the mixed forest is 0.454 g·kg-1 and 0.348 g·kg-1 respectively;In the mixed forest the total phosphorus element content is bigger than that in the Pinus elliottii stand and smaller than that in the locust tree stand.In the tree level,the bush level, the phosphorus element biomass size order is consistent with the total phosphorus element content.更多还原