摘要
研究了分布于浙江建德的青冈常绿阔叶林生态系统的 Ca的积累和循环。群落各代表种类的 Ca浓度为 0 .1 2 %～ 1 .2 5% ,变幅较大 ;其中能在石灰岩上分布的青冈比其它树种含 Ca量高 ,酸性土指示植物映山红含 Ca量很低。老的器官和个体中积累了较多的 Ca。青冈体内 Ca浓度的季节和径级变化不明显。枯叶和枯枝中的 Ca浓度比鲜叶和鲜枝高。降水通过林冠时有部分 Ca被淋溶出来。Ca在群落中现存量为 1 0 57.2 2 kg/hm2 ,死地被层中积累量为 93.43kg/hm2 ,土壤 ( A0 —B层 )中储存量为 6544kg/hm2。群落中 Ca的存留量为 1 39.46kg/( hm2 · a) ;归还量为 63.0 9kg/( hm2 · a) ,其中大部分通过凋落物归还 (约占70 % ) ;吸收量为 2 0 2 .55kg/( hm2·a)。降水输入了 1 2 .1 5kg/( hm2· a)的 Ca。青冈林具有较高的 Ca吸收量 /现存量比 ,但吸收的 Ca归还得较少 ;因此其对 Ca的利用效率较高 ,这是对红壤中
Accumulation and cycling of Ca in a subtropical evergreen broad leaved forest dominated by Cyclobalanopsis glauca growing on red soil in Zhejiang Province was elucidated in this paper The concentration of Ca in representative species were 0 12%~1 25% Old organs and individuals accumulated more Ca Seasonal dynamics and diameter change of the concentration of Ca was not evident The concentration of Ca in fallen leaves and branches was higher than that in fresh ones A proportion of Ca had leached from the canopy by incident precipitation The standing crop of Ca in the community was 1057 22 kg/hm 2,that in the litter layer was 93 43 kg/hm 2,and in the soil(A 0 B) was 6544 kg/hm 2 Retention of Ca was 139 46 kg/(hm 2·a) Return of Ca was 63 09 kg/(hm 2·a),in which via litterfall occupied about 70% Uptake of Ca was 202 55 kg/(hm 2 a) Annual input of Ca through incident precipitation was 12 15 kg/hm 2 Comparing with other forest types,use efficiency of Ca in the ecosystem was higher to adapt to the lower availability of Ca in the soil
出处
《武汉植物学研究》
CSCD
2000年第2期131-137,共7页
Journal of Wuhan Botanical Research
基金
国家自然科学基金项目!( No.3 9570 1 8)
浙江省自然科学基金项目!( No.3 960 3 5)的一部分
关键词
青冈
常绿阔叶林
生态系统
钙
积累
循环
Cyclobalanopsis glauca ,Evergreen broad leaved forest,Ecosystem,Potassium,Accumulation and cycling
