摘要
具有顶极群落稳定性的亚热带天然栲树林群落内不同层次、不同树种和不同器官的营养元素含量存在明显差异，反映了该群落在养分利用上的多样性。通过分析主要建群的种的养分含量以及营养元素在群落中不同层次和树种中的积累和分配规律，揭示出群落稳定性的养分机制。栲树群落的５种营养元素累积总量为１７１６．５ｋｇ／ｈｍ￣２，其中，各元素的累积量为：Ｎ５９６．７．Ｐ４１．９．Ｋ３９１．４，Ｃａ５３８．１ｋｇ／ｈｍ￣２．Ｍｇ１４８．４。５种元素在群落层次中的积累和分配为：乔木层１５５３．４ｋｇｌｋｍ￣２，其中Ⅰ亚层占８２．７％．Ⅱ、Ⅲ亚层各占１４．１％和３．２％；灌木层４４．７ｋｇ／ｈｍ￣２．草本层２９．１ｋｇ／ｈｍ￣２，死地被物层８９．３ｋｇ／ｈｍ￣２。栲树作为优势建群种，其养分的累积量占乔木层总量的８２．３％，其它树种仅占１７．７％。
atural Castanopsis fargesii forest in the subtropics belongs to a stable climax communi-ty.Distinct differences in chemical elements’content(CEC)among the layers, species andorgans of the community show the diversity of nutrition utilized by plants.Analyzation ofboth the CEC of main edificatos and the accumulation and distribution of nutrition in differ-ent layers and species of the community,the nutrient mechanism of community stability wasdiscovered.Total accumulation of five chemical elements.i.e.Nitrogen,Phosphorus,Potassi-um,Calcium and Magnesium,is 1716.5kg/hm￣2,in which,N 597.6,P41.9.K391.4,Ca538.1.Mg 148.4kg/hm￣2.The accumulation and distribution of the five elements among commtunitylayers is as follows:arbor layer is 1553.6kg/hm￣2.of which,sublayer Ⅰ,Ⅱ,Ⅲ comprised82.7%,14.1%and 3.25%of the value,respectively.Shrub,herb and litter layers are 44.7,29.1 and 89.3kg/hm￣2.respectively.As dominent edificato,Castanopsis fargesii acounts for82.3%in total nutrient accumulation of abor layer,but the other species only comprised17.7% of the accumulation.
出处
《生态学报》
CAS
CSCD
北大核心
1995年第2期155-162,共8页
Acta Ecologica Sinica
关键词
栲树
营养元素
空间格局
Castanopsis fargesii,nutrient element, spatial pattern, mechanism of stabili-ty.
