不同土壤水分含量下落羽杉根、茎、叶营养水平的差异  

Effects of Soil Water Contents on Nutrient Uptake and Allocation of Baldcypress

作　　者：汪贵斌[1] 曹福亮[1] 

机构地区：[1]南京林业大学森林资源与环境学院,江苏南京210037

出　　处：《林业科学研究》2004年第2期213-219,共7页Forest Research

基　　金：1997-2000年林业部重点项目"落羽杉优良种源;家系和无性系的引进"(97 04 01)

摘　　要：应用温室盆栽试验方法,采用完全随机试验设计,研究了土壤水分含量对1年生落羽杉实生苗的营养吸收及分配的影响。试验共有5种处理,即W1(淹水,水深为土壤表面以上5cm)、W2(渍水,水面与土面保持水平)、W3、W4、W5(土壤含水量分别为土壤田间持水量的75%、50%和25%),处理时间为130d。研究结果表明:(1)随着土壤水分含量的减少,落羽杉根、茎和叶中全N质量浓度均逐渐升高,根、茎、叶中全P质量浓度则又先升高后下降的趋势,以W3水分处理最高,根、茎和叶中全Ca、全K、全Na、全Mg、全Fe质量浓度则有不同的变化趋势;(2)所有处理根、茎、叶中全Fe、全N、全P、全Mg、全Na、全Ca、全K质量浓度大小的顺序为叶>根>茎;(3)随着土壤水分含量的减少,落羽杉对各种营养元素的吸收累积量减少,分配到根和茎中的比例增加,分配到叶中的比例逐渐减少。One year old seedlings of baldcypress (Taxodium distichum) were grown in pots under greenhouse conditions with varying soil water contents (W_1,flooding;W_2,waterlogging;W_3,75% of field water capacity;W_4,50% of field water capacity;W_5,25% of field water capacity) to study the effects of soil water contents on nutrient uptake and allocation of baldcypress. The treatment lasted 130 days, and the results are as follows: (1)The total N concentration of root, stem and leaf of baldcypress increased with increasing of soil water contents, and the total P concentration of root, stem and leaf of W_3 among five water treatments was the lowest, flooding or drought stress increased the total P concentration, and the total Ca, K, Na, Mg and Fe concentration in root, stem and leaf had different changing tendency; (2) The order of total N, P, Ca, K, Na, Mg and Fe concentration in root, stem and leaf was in the order of leaf>root>stem; (3) The total accumulation of nutrients in baldcypress decreased with decreasing of soil water contents, and the allocation ratio of root and stem increased with decreasing of soil water contents, while the allocation ratio of leaf decreased significantly with decreasing of soil water contents.

关 键 词：土壤水分含量 落羽杉 根 茎 叶 营养吸收 营养分配 

分 类 号：S791.34[农业科学—林木遗传育种]