广东省油茶林地不同母岩红壤养分限制因子研究  

Nutrient limiting factors in red soil from different parent rocks at oil-tea forest land of Guangdong Province

作　　者：丁锐[1] 邓小梅[1] 奚如春[1] 莫宝盈[1] 易立飒[1] 

机构地区：[1]华南农业大学林学院,广东广州510642

出　　处：《经济林研究》2012年第2期61-67,共7页Non-wood Forest Research

基　　金：林业公益性行业专项资金资助项目"优质丰产油茶专用肥研制"(200904058);国家自然科学基金项目"油茶果实氮磷钾养分讯号作用与调控机制"(30872052)

摘　　要：为了评价广东省油茶林地土壤养分状况及其主要限制因子,采用土壤养分系统研究法(ASI),以高粱为指示作物,对该省主要油茶林地土壤养分因子进行了测定与分析。土壤养分测定结果表明:供试油茶林地土壤中有机质的含量均较低,N、P、K元素严重缺乏,Ca、Mg、B、Zn、Mo等元素普遍缺乏,而S、Fe的含量丰富;就供试的4种类型油茶林地土壤养分吸附量而言,第四纪红壤对K、Zn、Mn、Cu和砂岩类土壤对B的吸附固定量大,而千枚岩类土壤对K、B、Cu和花岗岩类土壤对P、Mn、Zn的吸附固定量小。盆栽试验结果表明:花岗岩类土壤养分限制因子及其亏缺程度的排序为N>P>K>B>Mo>Mn,砂岩类土壤养分限制因子及其亏缺程度的排序为K>P>N>Zn,千枚岩类土壤养分限制因子及其亏缺程度的排序为P>N>K>Cu>Zn>Mn>Mo>S,第四纪红壤类土壤养分限制因子及其亏缺程度的排序为N>P>K>Zn>Mo>Cu>B。由此得知,P、N、K是广东省油茶林地土壤的主要养分限制因子,其次为Zn、B、Mo。文中还提出:下一步的田间试验应致力于N、P、K、B、Zn、Mo的平衡施肥,还应重视补充Ca与Mg元素。Main soil nutrient factors at oil-tea forest land of Guangdong Province were assessed by soil nutrient systematic approach, selecting sorghum as indicator plant, in order to evaluate soil nutrient status and its limiting factors. The results showed that organic matter content was lower in all tested soils, N, P and K were severely deficient, deficiency of Ca, Mg, B, Zn and Mo was rather common, but S and Fe were sufficient. In the tested soils, Quaternary red soil to K, Zn, Mn and Cu, and Sandstone soil to B, had larger capacity of adsorption and fixation. While Phyllite soil to K, B and Cu, and Granite soil to P, Mn and Zn, had weaker capacity of adsorption and fixation. The results of pot experiment showed that the order of the limiting factors based on nutrient deficient degree from high to low was N, P, K, B, Mo, Mn in Granite soil; the order was K, P, N, Zn in Sandstone soil; the order was P, N, K, Cu, Zn, Mn, Mo, S in Phyllite soil; the order was N, P, K, Zn, Mo, Cu, B in Quaternary red soil. So P, N and K were main soil nutrient limiting factors at oil- tea forest land in Guangdong Province, and then followed by Zn, B and Mo. Next field experiment should be focused on balanced fertilization of N, P, K, B, Zn and Mo. Moreover, much attention should be paid to supplement of Ca and Mg.

关 键 词：土壤养分状况 油茶林地 养分限制因子 土壤养分系统研究法 红壤 广东省 

分 类 号：S606[农业科学—园艺学] S794.4