The net primary productivity of vegetation reflects the total amount of carbon fixed by plants through photosynthesis each year. The study of vegetation net primary productivity is one of the core contents of global c...The net primary productivity of vegetation reflects the total amount of carbon fixed by plants through photosynthesis each year. The study of vegetation net primary productivity is one of the core contents of global change and terrestrial ecosystems. This article reviews the current research status of net primary productivity of terrestrial vegetation, and comprehensively analyzes the advantages and disadvantages of three types of productivity estimation models, climate relative models, biogeochemical models, and light energy utilization models. The light energy utilization models have become the mainstream method for estimating vegetation net primary productivity because they can directly use remote sensing data. However, there are still many deficiencies in the estimation of vegetation net primary productivity, which need to be further improved and tested.展开更多
以盐酸甜菜碱(Betaine·HCl)、乙二醇(EG)和六水合硫酸镍(NiSO_4·6H_2O)制备的Betaine·HCl-6EG-nNiSO_4·6H_2O低共熔离子液体为电解液,在碳钢(CS)基体上电沉积出平整致密的金属镍镀层.采用旋转黏度计和电导率仪分别...以盐酸甜菜碱(Betaine·HCl)、乙二醇(EG)和六水合硫酸镍(NiSO_4·6H_2O)制备的Betaine·HCl-6EG-nNiSO_4·6H_2O低共熔离子液体为电解液,在碳钢(CS)基体上电沉积出平整致密的金属镍镀层.采用旋转黏度计和电导率仪分别测定了其黏度和电导率.在测试条件下,其黏度为3.918~55.19 m Pa·s,电导率为1.109~0.199 S/m.循环伏安测试结果表明Betaine·HCl-6EG-nNiSO_4·6H_2O(n=0.071)低共熔离子液体中Ni^(2+)在CS电极上的电化学还原过程可以描述为Ni^(2+)→Ni^0,其起始还原电位为-0.56 V.对CS基体上的沉积层进行XRD和EDAS测试,分析结果表明镀层为具有面心立方晶型结构的金属镍.SEM结果表明得到的镍镀层晶粒细小致密且均匀.镀层截面组织金相照片和线性扫描能谱图表明沿CS基体各处均得到厚度分布均匀且与基体结合良好的镍镀层,其厚度约为11μm.展开更多
文摘The net primary productivity of vegetation reflects the total amount of carbon fixed by plants through photosynthesis each year. The study of vegetation net primary productivity is one of the core contents of global change and terrestrial ecosystems. This article reviews the current research status of net primary productivity of terrestrial vegetation, and comprehensively analyzes the advantages and disadvantages of three types of productivity estimation models, climate relative models, biogeochemical models, and light energy utilization models. The light energy utilization models have become the mainstream method for estimating vegetation net primary productivity because they can directly use remote sensing data. However, there are still many deficiencies in the estimation of vegetation net primary productivity, which need to be further improved and tested.
文摘以盐酸甜菜碱(Betaine·HCl)、乙二醇(EG)和六水合硫酸镍(NiSO_4·6H_2O)制备的Betaine·HCl-6EG-nNiSO_4·6H_2O低共熔离子液体为电解液,在碳钢(CS)基体上电沉积出平整致密的金属镍镀层.采用旋转黏度计和电导率仪分别测定了其黏度和电导率.在测试条件下,其黏度为3.918~55.19 m Pa·s,电导率为1.109~0.199 S/m.循环伏安测试结果表明Betaine·HCl-6EG-nNiSO_4·6H_2O(n=0.071)低共熔离子液体中Ni^(2+)在CS电极上的电化学还原过程可以描述为Ni^(2+)→Ni^0,其起始还原电位为-0.56 V.对CS基体上的沉积层进行XRD和EDAS测试,分析结果表明镀层为具有面心立方晶型结构的金属镍.SEM结果表明得到的镍镀层晶粒细小致密且均匀.镀层截面组织金相照片和线性扫描能谱图表明沿CS基体各处均得到厚度分布均匀且与基体结合良好的镍镀层,其厚度约为11μm.
