茂兰喀斯特原生林凋落物及矿质元素归还动态  

Litter and Mineral Elements Return Dynamics of Primeval Forest in Maolan Karst Area

作　　者：熊红福 XIONG Hongfu(School of Material and Chemical Engineering,Tongren University,Tongren Guizhou 554300)

机构地区：[1]铜仁学院材料与化学工程学院,贵州铜仁554300

出　　处：《现代农业科技》2024年第3期119-123,131,共6页Modern Agricultural Science and Technology

基　　金：贵州省教育厅自科项目(黔教合KY字[2020]175);铜仁学院博士科研启动基金(trxydh1825)。

摘　　要：植物生长所需的大部分矿质元素均来自凋落物归还给土壤的物质再循环,本研究对茂兰喀斯特原生林凋落物及矿质元素归还动态进行了定位观测。结果表明:年总凋落物量为(5248.6±838.5)kg/hm^(2),叶凋落量占总凋落物量的68.2%,总凋落物量与叶凋落物量的凋落节律均呈双峰型;总的月凋落物量、叶的月凋落物量、枝的月凋落物量与月均温度及月降水量的相关性均不显著,花果等的月凋落物量与月均温度及月降水量均成极显著正关性。原生乔木林叶凋落物中K、Ca、Mg、Fe、Mn、Zn、Na 7种矿质元素的月含量变化不规则,含量大小为Ca>Mg>K>Mn=Fe>Zn>Na。叶凋落物中K、Ca、Mg、Fe、Mn、Zn 6种矿质元素的月归还量与叶的月凋落物量相关性极显著。叶凋落物中Ca、Mg、K、Mn、Fe、Zn、Na的年归还量分别为89.03、13.03、10.01、0.82、0.77、0.14、0.07 kg/hm^(2),7种矿质元素的年归还量与其年均含量极显著正相关。Most of the mineral elements required by plants come from nutrient recycling by returning litter to the soil.Litter and mineral elements dynamics of primeval forest in Maolan karst area were studied.The results showed that the total annual litter biomass was(5248.6±838.5)kg/hm^(2),the leaf litter accounted for 68.2%of the total litter,the litter dynamics of total litter and leaf litter exhibited a bimodal distribution.The correlation between total monthly litter,monthly leaf litter,monthly branch litter and monthly average temperature,monthly precipitation was not significant.The monthly litter of flowers and fruits showed a highly significant positive correlation with monthly average temperature and monthly precipitation.The monthly concentrations of K,Ca,Mg,Fe,Mn,Zn and Na in the leaf litter of primeval forest showed irregular changes,with the concentration in the order of Ca>Mg>K>Mn=Fe>Zn>Na.The monthly returns of six mineral elements such as K,Ca,Mg,Fe,Mn,Zn in leaf litter were highly correlated with the monthly leaf litter.The annual returns of Ca,Mg,K,Mn,Fe,Zn and Na in leaf litter were 89.03,13.03,10.01,0.82,0.77,0.14 and 0.07 kg/hm^(2),respectively.The annual returns of the seven mineral elements were significantly positively correlated with their annual concentrations.

关 键 词：凋落物 矿质元素 归还量 茂兰喀斯特区 

分 类 号：S714[农业科学—林学]