鼎湖山马尾松林营养元素的分布和生物循环特征  

Nutrient distribution and cycling of a Masson's pine planted forest in Dinghushan

作　　者：莫江明[1] SandraBrown 孔国辉[1] 张佑昌[1] MelanieLenart 

机构地区：[1]中国科学院鼎湖山森林生态系统定位研究站,广东肇庆鼎湖526070 [2]美国伊莉诺大学林学系

出　　处：《生态学报》1999年第5期635-635,共1页Acta Ecologica Sinica

基　　金：USA MAB;中国科学院资环局和国家自然科学基金重大资助项目!( 39899370)

摘　　要：较系统地研究了鼎湖山马尾松林营养元素的分布和生物循环情况。马尾松林内各组分营养元素浓度总的规律为:针叶>细根>林下层植物>凋落物>树皮>树干;在树皮、树干和凋落物组分中各营养元素的排序为:N>Ca>K>Mg>P;其它组分中则为:N>K>Ca>P>Mg。马尾松林各营养元素的总贮量(kg/hm2)为:2278.51(N),280.01(P),567.90(K),456.84(Ca),144.76(Mg),其中74%～95%集中在土壤组分。在地上部分则78%～97%集中在乔木层。乔木层又以树干占的比例最高,尤其是钙和镁两种元素(46.85%,49.97%)。各营养元素贮量排序基本上为:N>Ca>K>Mg>P(地上);N>K>Ca>P>Mg(地下)。乔木层地上部分营养元素的年积累量(kg/hm2.a)为:3.63(N),0.10(P),1.04(K),2.72(Ca),0.40(Mg)。本研究松林的营养利用系数为:0.16(N),0.10(P),0.09(K),0.08(Ca),0.08(Mg);循环系数:0.83(N),0.83(P),0.71(K),0.68(Ca),0.68(Mg);周转期(a):7.8(N),12.2(P),15.4(K),17.7(Ca),17.9(Mg)Nutrient distribution and cycling of a Masson's pine ( Pinus massoniana ) planted forest in Dinghushan,Guangdong Province were systematically studied.Nutrient concentrations of various components showed the following order:needles>fine roots>understory>litter>bark>wood.The nutrient element patterns were:N>Ca>K>Mg>P in bark,wood and litter components,and N>K>Ca>P>Mg in other components.The total nutrient standing stocks were estimated to be (kg/hm 2):2278.51(N), 280.01 (P),567.90(K),456.84(Ca),and 144.76(Mg).Most of these nutrients were distributed in the soil component(74%～95%).Of the nutrient standing stocks in the aboveground components,78% to 97% were contained in the tree layer.In the tree layer,wood contained the highest nutrient standing stocks,especially for Ca and Mg(46.85% and 49 97%,respectively).The relative amount of the five nutrients in aboveground components were generally:N>Ca>K>Mg>P,and in belowground components were:N>K>Ca>P>Mg.The nutrient annual acummulation in the tree layer were(kg/hm 2·a):3.36(N),0.01(P),1.04(K),2.72(Ca) and 0.40(Mg).The nutrient utilization coefficient of the five elements were estimated to be:0.16(N),0.10(P),0.09(K),0.08(Ca) and 0.08(Mg),and the nutrient recycling period were also estimated.

关 键 词：马公 鼎湖山 营养元素 分布 生物循环 

分 类 号：S791.248[农业科学—林木遗传育种]