In order to study hydrochemical characteristics and ion transfer of annual rainfall of Betula platyphylla secondary forest,water samples of rainfall,throughfall,stemflow,litter infiltration water and slope runoff of B...In order to study hydrochemical characteristics and ion transfer of annual rainfall of Betula platyphylla secondary forest,water samples of rainfall,throughfall,stemflow,litter infiltration water and slope runoff of Betula platyphylla secondary forest in the early growth stage,fastgrowing stage and growth decline stage in Shanjiankou watershed of Xiaowutai Mountain and nine indexes of pH,Ca^2+,Mg^2+,K+,Na+,Zn^2+,Mn^2+,Fe^2+ and Cu^2+ were determined.The results showed that:①The annual rainfall was weakly alkaline,and the ion concentration in different stages was obviously different.According to the ratio of the maximum concentration to the minimum concentration of the same ion,the rank was Mg^2+ > Mn^2+ >Na+ > K+ > Ca^2+ > Cu^2+ > Fe^2+ > Zn^2+.②Compared with the rainfall in the same period,in the early growth stage,Mg^2+,Mn^2+,Na+,K+,Ca^2+,Fe^2+ and Zn^2+ showed leaching loss in each distribution process.In the fastgrowing stage,Ca^2+,Mn^2+ and Fe^2+ showed leaching loss in each distribution process;Mg^2+ showed absorption,Na+ showed leaching loss in slope runoff and showed absorption in other process.K+ showed leaching loss in stemflow and showed absorption in other process.Zn^2+ showed absorption in stemflow and slope runoff and showed a little leaching loss in other process.In the late growth stage,Ca^2+,Mg^2+,Zn^2+,Mn^2+ and Fe^2+ showed leaching loss in each distribution process;Na+ and Cu^2+ showed absorption;K+ showed absorption in stemflow and showed leaching loss in other process.Most of the rainfall and metal ions in Betula platyphylla secondary forest were intercepted by litter layer.展开更多
森林土壤呼吸速率和地下碳分配是森林碳平衡的两个重要分量。本研究选择枫桦次生林和原始阔叶红松林为研究对象,测定其土壤呼吸速率和地下碳分配以及相关的环境因子。研究结果表明,生长季内枫桦次生林的土壤呼吸速率的平均值略高于原始...森林土壤呼吸速率和地下碳分配是森林碳平衡的两个重要分量。本研究选择枫桦次生林和原始阔叶红松林为研究对象,测定其土壤呼吸速率和地下碳分配以及相关的环境因子。研究结果表明,生长季内枫桦次生林的土壤呼吸速率的平均值略高于原始阔叶红松林,分别为5.52和5.43μmol·m-2·s-1。土壤温度是造成土壤呼吸速率季节性变化的主要影响因子,可以分别解释两种林型土壤呼吸速率的77%和81%变异。枫桦次生林和原始阔叶红松林的Q10值分别为2.74和2.23。枫桦次生林的土壤呼吸年通量为9.66 t C·hm-2·a-1,略高于原始阔叶红松林的9.37 t C·hm-2·a-1。枫桦次生林和原始阔叶红松林的地下碳分配量分别为7.73和7.56 t·hm-2·a-1。展开更多
基金Sponsored by Subsidy Project of Operation of Forestry Science and Technology Innovation Platform(2017-LYPTDW-004).
文摘In order to study hydrochemical characteristics and ion transfer of annual rainfall of Betula platyphylla secondary forest,water samples of rainfall,throughfall,stemflow,litter infiltration water and slope runoff of Betula platyphylla secondary forest in the early growth stage,fastgrowing stage and growth decline stage in Shanjiankou watershed of Xiaowutai Mountain and nine indexes of pH,Ca^2+,Mg^2+,K+,Na+,Zn^2+,Mn^2+,Fe^2+ and Cu^2+ were determined.The results showed that:①The annual rainfall was weakly alkaline,and the ion concentration in different stages was obviously different.According to the ratio of the maximum concentration to the minimum concentration of the same ion,the rank was Mg^2+ > Mn^2+ >Na+ > K+ > Ca^2+ > Cu^2+ > Fe^2+ > Zn^2+.②Compared with the rainfall in the same period,in the early growth stage,Mg^2+,Mn^2+,Na+,K+,Ca^2+,Fe^2+ and Zn^2+ showed leaching loss in each distribution process.In the fastgrowing stage,Ca^2+,Mn^2+ and Fe^2+ showed leaching loss in each distribution process;Mg^2+ showed absorption,Na+ showed leaching loss in slope runoff and showed absorption in other process.K+ showed leaching loss in stemflow and showed absorption in other process.Zn^2+ showed absorption in stemflow and slope runoff and showed a little leaching loss in other process.In the late growth stage,Ca^2+,Mg^2+,Zn^2+,Mn^2+ and Fe^2+ showed leaching loss in each distribution process;Na+ and Cu^2+ showed absorption;K+ showed absorption in stemflow and showed leaching loss in other process.Most of the rainfall and metal ions in Betula platyphylla secondary forest were intercepted by litter layer.
文摘森林土壤呼吸速率和地下碳分配是森林碳平衡的两个重要分量。本研究选择枫桦次生林和原始阔叶红松林为研究对象,测定其土壤呼吸速率和地下碳分配以及相关的环境因子。研究结果表明,生长季内枫桦次生林的土壤呼吸速率的平均值略高于原始阔叶红松林,分别为5.52和5.43μmol·m-2·s-1。土壤温度是造成土壤呼吸速率季节性变化的主要影响因子,可以分别解释两种林型土壤呼吸速率的77%和81%变异。枫桦次生林和原始阔叶红松林的Q10值分别为2.74和2.23。枫桦次生林的土壤呼吸年通量为9.66 t C·hm-2·a-1,略高于原始阔叶红松林的9.37 t C·hm-2·a-1。枫桦次生林和原始阔叶红松林的地下碳分配量分别为7.73和7.56 t·hm-2·a-1。
