不同林龄新疆杨养分特征与生物量研究

摘要

Contents of soil organic carbon(SOC),total nitrogen (N),phosphorus(P)and potassium (K)in soils,and N,P,K contents and biomass of root,stem,branch & leaf of different-aged Populus bolleana plantations in the He-tian region of China were analyzed.Result shows that the descending order of SOC and total N concentrations is ma-ture plantation > near-mature plantation > middle-aged plantation > young-aged plantation;the descending order of total P is near-mature plantation > young-aged plantation > mature plantation >middle-aged plantation.The de-scending order of content of total K is young-aged plantation>near-mature plantation>mature plantation>middle-aged plantation.Content of N and P in roots and leaves increase with the increase of the stand age of plantation,but the opposite pattern was found for K concentrations in roots and leaves.Content of N,P and K in stem remained un-changed across different-aged plantations.Among biomass of different tissues in different-aged plantations,the de-scending order of biomass allocation is stems> roots> leaves.%分析了和田地区不同林龄新疆杨土壤有机碳、氮、磷、钾含量,林木根、干、枝、叶中 N、P、K 含量和生物量。结果表明：各林龄新疆杨土壤有机碳和全氮含量依次为成熟林>近熟林>中龄林>幼龄林；全磷含量为近熟林>幼龄林>成熟林>中龄林；全钾含量为幼龄林>近熟林>成熟林>中龄林。新疆杨根和叶中 N、P 含量随着林龄的增加而增加,K 含量则表现出相反趋势；茎中 N、P、K 含量变化不大；不同林龄新疆杨生物量的器官分配比例虽有所不同,但均以干所占的比例最大,枝次之,叶最小。