摘要
文章通过各种调查、取样和分析技术，并利用生物量和生产力模型，对浙江建德青冈常绿阔叶林Ｐ的积累、循环和利用效率进行了研究。群落各代表种类的Ｐ浓度在０．０１７％～０．０７３％之间，其中藤本、草本＞下木层＞乔木层、亚乔木层植物。各器官中Ｐ浓度叶＞枝＞根＞干。青冈中Ｐ浓度为下木层＞乔木层＞亚乔木层；幼嫩、生长旺盛的器官和生殖器官中积累了较多的Ｐ。乔木层和亚乔木层青冈中Ｐ浓度季节变化较平稳；幼苗各部位在１月份Ｐ浓度较高。不同径级青冈中Ｐ浓度变化无明显规律。凋落物凋落之前，Ｐ有被回收的现象，其中枯叶有７０％以上的Ｐ被回收。Ｐ在群落中现存量为３９．８４ｋｇ·ｈｍ－２，死地被层中积累量为４．０３ｋｇ·ｈｍ－２，土壤（Ａ０～Ｂ层）中储存量为５１５９ｋｇ·ｈｍ－２。群落Ｐ的存留量为４．６９ｋｇ·ｈｍ－２·ａ－１；归还量为１．９２ｋｇ·ｈｍ－２·ａ－１，其中通过凋落物的为１．４８ｋｇ·ｈｍ－２·ａ－１，通过穿透水的为０．４４ｋｇ·ｈｍ－２·ａ－１；吸收量为６．６１ｋｇ·ｈｍ２·ａ－１。降水输入了０．４２ｋｇ·ｈｍ－２·ａ－１的Ｐ。与其它森林类型相比，Ｐ的利用效率较高，主要由于凋落物凋落之前Ｐ的回收率高。这是４０龄青冈林对土壤中低?
By investigating and taking samples, the accumulation, cycle and utilization efficiency of phosphorus in a subtropical evergreen broad-leaved forest dominated by C. glauca growing on red soil in Zhejiang Province was elucidated with biomass and yield model. The concentrations of P in the representative species are 0 017%～0 073% The order of them in various layers is Liana and herb>Understory>Tree and Subtree, and that in various organs are leaf>branch>root>trunk. The sequences of the concentrations of P in C. glauca are understory>tree>Subtree, young and highly growing>old organs, reproductive>vegetative organs. Seasonal dynamics of the concentrations of P in C. glauca in tree and subtree layers are relatively stable, and that in understory is higher in January. There is no evident changing regularity of the concentrations of P in varying diameter classes. P is translocated before litter senesced and falling, and the resorption rate of P of the fallen leaves are over 70%. The standing crop of P in the community is 39 84kg·hm -2 , in the litter layer is 4 03kg·hm -2 , and in the soil(A 0-B) is 5159kg·hm -2 Retention of P is 4 69kg·hm -2 ·a -1 Return of it was 1 92kg·hm -2 ·a -1 , in which via litter is 1 48kg·hm -2 ·a -1 , via throughfall is 0 44kg·hm -2 ·a -1 Uptake of P is 6 61kg·hm -2 ·a -1 . Annual input of P through incident precipitation is 0.42kg·hm -2 . Comparing with other forest types, use efficiency is higher in this ecosystem. It is mainly caused by the high resorption rate of P before litter falling, and it's an effective adaptation of this community to the lower availability of P in the acid soil(pH=4.5～5 2).
出处
《东北林业大学学报》
CAS
CSCD
北大核心
1998年第4期17-23,共7页
Journal of Northeast Forestry University
基金
国家自然科学基金
浙江省自然科学基金
关键词
青冈
常绿阔叶林
磷
生物循环
利用效率
Cyclobalanopsis glauca
Evergreen broad leaved forest
Phosphorus
Biocycle
Use efficiency
