福寿林场杉木林土壤微量元素的储量研究

Storage of Soil Microelements of Cunninghamia lanceolatain Fushou Forest Farm

基于福寿林场杉木林不同土层(15、30、45、60cm)土壤微量元素的实测数据,分析了不同龄组杉木林土壤微量元素储量的变化特征。结果表明:随着杉木林的生长发育,0~60cm土壤的微量元素Cu、Fe、Zn、Mn、B的储量都表现出了幼龄林较高,中龄林降低,成熟林又升高的变化规律,变异系数Cu>Mn>B>Zn>Fe。在0~60cm土层内,3个龄组杉木林微量元素Cu、Fe、Zn、Mn、B储量依次为127.46~246.22、118 315.88~131 166.29、659.79~748.74、2 301.11~3 686.83、38.14~40.16kg·hm^(-2)。随着土层的加深,3个龄组杉木林Zn的储量在各土层都呈现出均匀分布的规律,而Cu和Fe主要分布在土层15~60cm范围内,下层土壤中的储量比上层土壤储量明显要高,表现出明显的沉积现象,土层45~60cm微量元素Cu和Fe的储量分别是土层0~15cm的1.96~2.63倍和1.21~1.35倍。而Mn和B的储量随着土层的加深没有明显的变化规律。

Storages of microelement in the soils with different depths （15,30,46,60 cm） in Cunninghamia lanceolata in Fushou Forest Farm of Hunan Province were analyzed to understand the variation character- istics of soil microelement in three age-group of C. lanceolata. The results showed that with the growth and development of C. lanceo/ata,the microelement contents of Cu,Fe,Zn,Mn and B in soil layers of 0--60 cm were high in the young stand, low in the middle-aged stand, and increased again in the mature stand. The order of variation coefficient was Cu 〉Mn 〉B 〉Zn 〉 Fe. The mieroelement storages of Cu,Fe,Zn,Mn and B were 127.46--246.22,118 315.88--131 166.29,659.79--748.74,2 301.11--3 686.83 and 38.14-- 40.16 kg · hm-2 ,respectively. With the increase of soil depth,the storage of Zn was evenly distributed in each soil layer,however,the Cu and Fe mainly distributed in the soil layer of 15--60 cm,their storages in the subsoil were higher than upper layer, which displayed an apparent deposition. The storages of Cu and Fe in the soil layers of 45--60 cm were 1.96--2.63 and 1.21--1.35 times higher than those in soil layer of 0--15 cm,but the storage of Mn and B had no significant changes with soil depth.