鼎湖山黄果厚壳桂群落的凋落物及其氮素动态  

LITTER MASS AND ITS NITROGEN DYNAMICS OF CRYPTOC-ARYA CONCINNA COMMUNITY IN THE DINGHUSHAN BOOSPHERE RESERVE

作　　者：蚁伟民[1] 丁明懋[1] 张祝平[1] 廖兰玉[1] 黄忠良[1] 

机构地区：[1]中国科学院华南植物研究所

出　　处：《植物生态学报》1994年第3期228-235,共8页Chinese Journal of Plant Ecology

基　　金：国家自然科学基金;中美阔叶林生物圈对比研究项目;美国MAB资助

摘　　要：对鼎湖山季风常绿阔叶林的黄果厚壳桂、鼎湖钓樟群落的凋落物量进行了两周年的观测．结果分别是１２．１６和６．５８ｔ·ｈａ￣（－１）·ｙｒ￣（－１）。不仅年间凋落物量有差别，各月调落物量也不尽相同。气候的变化对凋落物影响较大。用自然分解法Ⅰ和Ⅱ测得凋落物年分解失重率分别为７２．４％和７０．２％，ｔ－检验结果表明两种方法无明显差别。用网袋法测得凋落物的年分解失重率为６４．９％，稍低于自然分解法，与尼龙袋阻隔了某些分解凋落物的生物进入袋内有关。试验开始时测得地被物层重２．８７ｔ·ｈａ￣（－１），含氮量３６．６３ｋｇ·ｈａ￣（－１），一年试验期间通过凋落物进入地被物层的氮量为１７２．１９ｋｇ·ｈａ￣（－１），合计地被物层应有２０８．８２ｋｇ·ｈａ￣（－１）的氮。但经一年分解后，在试验结束时再次测定地被物的重量和含氮量，则分别为４．３２ｔ·ｈａ￣（－１）和５５．２５ｋｇ·ｈａ￣（－１）。经计算（２０８．８２—５５．２５），已有１５３．５７ｋｇ·ｈａ￣（－１）·ｙｒ￣（－１）的氮从地被物层流入土壤。这部分氮相当于该群落年生长需氮量的７１％，营养循环相当旺盛，反映了群落处于生长发展盛期。The litter mass in Cryptocarya concinna, Lindera chunii community belo-nging to monsoon evergreen broad-leaf forest in the Dinghushan BiosphereReserve was 12.16 and 6.58t·ha￣(-1)yr￣(-1),investigated from February 1989 toJanuary 1990 and from June 1990 to May 1991. The litter mass not onlyvaried in different months and years, but also varied in the same month ofdifferent vears due to the influence of climatic fluctuations.The rate of litter decomposition was determined by natural decompositionmethod Ⅰ and Ⅱ. The resuIts were 72.4 and 70.2%,respectively.There wasno significant difference by t-test. The rate of litter decomposition determi-ned by using the nylon bag method was 64.9%, which was lower than thatby natural decomposition methods because nylon networks prevented some

关 键 词：黄果厚壳桂 群落 凋落物 氮素 森林 

分 类 号：S718.549[农业科学—林学]