桉树林地枯枝落叶层的水文特性及养分贮量  

Hydrological characteristics and nutrient storage of litterfall in Eucalyptus sp. plantation

作　　者：黄承标[1] 杨钙仁[1] 魏国余 张家昌 黎学文 陆燕梅[1] 

机构地区：[1]广西大学林学院,广西南宁530005 [2]广西国营高峰林场,广西南宁530001

出　　处：《福建林学院学报》2011年第4期289-294,共6页Journal of Fujian College of Forestry

基　　金：国家自然科学基金资助项目(40861025);广西大学科研基金资助项目(X081023)

摘　　要：通过标准样地,研究了立地条件相似、造林密度相同的连续年龄序列(1-6 a)桉树(Eucalyptus sp.)人工林地枯枝落叶层储量及其吸水速率和主要养分含量。结果表明:(1)林地枯枝落叶层贮量与年龄序列存在紧密的相关性,其回归模型为Y=-0.140 4X2+3.085 6X-2.426(R2=0.981 5);6年生时林地枯枝落叶层的最大净持水量达2.0 mm。(2)各林地枯枝落叶层的吸水速率基本相似,其平均吸水速率的回归式为Y=3.706 7X-0.9609(R2=0.999 4)。(3)林地枯枝落叶层主要养分含量的分配序列较相似,平均值显示出N(7.60 g.kg-1)>Ca(6.26 g.kg-1)>K(1.06 g.kg-1)>Mg(0.84 g.kg-1)>P(0.18 g.kg-1)的规律,并随年龄序列的增加而下降,其回归式为Y=0.649 1X2-8.509 1X+44.204(R2=0.963 0)。(4)林地枯枝落叶层主要养分贮量随年龄序列的增加而递增,即1年生(4.96 kg.hm-2)<2年生(32.19 kg.hm-2)<3年生(34.37kg.hm-2)<4年生(57.40 kg.hm-2)<5年生(60.96 kg.hm-2)<6年生(133.58 kg.hm-2),其回归式为Y=6.328 7X1.610 3(R2=0.925 2)。To investigate the dynamics of water and nutrient in Eucalyptus sp.plantation,litterfall samples were collected from 6 comparable forest stands with continuous age series（1,2,3,4,5,and 6 a）.The samples were analyzed for total N,P,K,Ca,Mg,water absorption rate,and maximum water holding capacity（WHC）.The results showed that,（1）Litterfall biomass was positively correlated to forest age and the regression equation between litterfall biomass and ages was： Y=-0.140 4X 2＋3.085 6X-2.426（R2=0.981 5）;The maximum net WHC of litterfall increased with forest ages and the WHC of 6-year eucalyptus forest was 2.0 mm.（2）Water absorption rate of litterfall did not differ significantly among different ages of forest.The regression equation between water absorption rate and absorption time was： Y=3.706 7X-0.960 9（R2 = 0.999 4）.（3）The contents of total N,P,K,Ca,Mg were negatively correlated with forest ages,the regression equation of which was Y=0.649 1X2-8.509 1X＋44.204（R2=0.963 0）.The overall average contents of total N,P,K,Ca,Mg in litter layer under Eucalyptus sp.plantation were 7.60,0.18,1.06,6.26,0.84 g·kg-1,respectively.（4）Retention of nutrients in litterfall layer increased with forest ages.The amount of nutrient remained in 1,2,3,4,5,and 6 years forest stands were 4.96,32.19,34.37,57.40,60.96,and 133.58 kg·hm-2,respectively.The regression equation between nutrient retention and forest ages was： Y=6.328 7X1.610 3（R2 = 0.925 2）.

关 键 词：枯枝落叶层 水文特性 养分贮量 桉树人工林 

分 类 号：S718.5[农业科学—林学]