摘要
对湖南株洲22～25年生的樟树、火炬松、槲栎、醉香含笑4个树种树干茎流及林外大气降水中N、P、SiO2、K、Ca、Mg、Cu、Zn、和Mn 9种养分元素含量进行了为期一年的测定。结果表明:不同月份大气降水养分元素含量不同,各元素各月平均含量按大小排序为Ca>NH4-N>SiO2>Zn>K>NO3-N>Mg>Fe>Mn>P>Cu;大气降水经过林冠层后,树干茎流中各养分元素含量变化基本一致,均表现季节动态变化,相对于大气降水,大多数元素含量增加;不同树种间树干茎流养分特征表现不同,按总含量值排序依次为火炬松、槲栎、樟树、醉香含笑;不同养分元素之间的相对含量也表现出较大的差别,NH4-N、Ca、K、SiO2含量最高,Mg、NO3-N、Zn、Mn含量居中,P、Fe、Cu含量最低。与大气降水相比,4个树种茎流共同表现为,Cu的含量变化较小,其它元素含量均有较大的变化,其中樟树茎流中Zn,SiO2,Fe,Cu;火炬松、槲栎茎流中Zn,Fe;醉香含笑茎流中Zn为负淋洗,4个树种对Zn的负淋洗表现的尤为显著。
The concentrations of 9 nutrient elements （N、P、K、Ca、Mg、Cu、Zn、Mn、SiO2） in stem-flow, and rainfall were measured in 22 - 25 years old Cinnamomum camphora, Pinus taeda, Quercus aliena, Michelia macclurei from April of 2003 to July of 2004 at Zhuzhou. The results showed：the concentrations of the nutrients in rainfall varied according to the month; The concentration sequence of the nutrient elements in precipitation were follows： Ca 〉 NH4-N 〉 SiO2〉 Zn 〉 K 〉 NO3-N 〉 Mg 〉 Fe 〉 Mn 〉 P 〉 Cu ; The concentrations of the nutrients in stem-flow also varied in the same way and changed seasonally. Compared with that in precipitation, most of them increased; The nutrient characteristics of stem-flow for different tree species differed significantly and the concentration sequence of the total nutrient elements in stem-flow were follows ： Pinus taeda, Quercus aliena, Cinnamomum camphora, Michelia macclurei; Proportion of nutrient in stem-flow of different nutrient elements also differed significantly among all nutrients analysed. It was found that the highest concentration was for NH4-N, Ca, K, SiO2, middle for Mg, NO3-N, Zn, Mn, and the lowest for P, Fe, Cu; Compared with atmospheric precipitation, the stem-flow of four tree species together performance were, the concentration of Cu nearly did not change, other element content had a bigger change, Cinnamomum camphora stem-flow Zn, SiO2, Fe, Cu ;Pinus taeda, Quercus aliena stem-flow Zn, Fe ; Michelia macclurei stem-flow Zn were lower than those in precipitation, significant variation was especially noted for Zn in the four tree species.
出处
《林业科学研究》
CSCD
北大核心
2007年第3期408-414,共7页
Forest Research
基金
国家自然科学基金(编号30571487)
省自然科学基金(05JJ40127)
省科技厅重点项目(06FJ3083
05NK3026)
省教育厅项目(05C331)
省青年骨干教师培养对象项目
校高层次引进人才项目资助
关键词
降水
树干茎流
养分含量
亚热带
precipitation
stem-flow
nutrient concentration
sub-tropic zone for Zn in the
