古尔班通古特沙漠典型灌木群落土壤化学计量特征及其影响因素  

Soil Stoichiometry and Their Influencing Factors in Typical Shrub Communities in the Gurbantunggut Desert,China

作　　者：陶冶[1,2] 吴甘霖 刘耀斌 张元明[2] 

机构地区：[1]安庆师范大学生命科学学院/皖西南生物多样性研究与生态保护安徽省重点实验室,安徽安庆246133 [2]中国科学院新疆生态与地理研究所,干旱区生物地理与生物资源重点实验室,新疆乌鲁木齐830011 [3]固原市工业和信息化局,宁夏固原756000

出　　处：《中国沙漠》2017年第2期305-314,共10页Journal of Desert Research

基　　金：国家重点基础研究发展计划项目(2014CB954202);中国科学院西部博士项目(XBBS-2014-20);新疆杰出青年人才项目(2013711013)

摘　　要：对古尔班通古特沙漠3种典型灌木群落77个样地的0~10cm层土壤及环境因子进行调查取样,分析了土壤有机碳(C)、全氮(N)、全磷(P)及全钾(K)的化学计量特征及其影响因素。结果表明:土壤C、N、P、K含量均值分别为1.057、0.133、0.319、14.11g·kg^(-1),C∶N、C∶P、C∶K、N∶P、N∶K、P∶K值分别为8.124、3.486、0.099、0.434、0.013、0.034。本研究土壤C、N、P养分元素含量及其化学计量比均远低于全球及全国平均水平。C∶N和P含量具有较高的稳定性(CV=19.26%和22.46%),而K、C∶K、N∶K和P∶K变异性较强(CV=52.17%~80.30%)。土壤化学计量特征在不同群落类型间、不同结皮类型间均有一定差异。C-N、C-K、P-K之间以及土壤养分与其化学计量比之间具有显著的非线性耦合关系,可用二次函数、幂函数或指数函数等非线性函数表征。相关性分析和CCA排序分析表明,除C∶N不受所调查环境因子影响外,土壤化学计量特征主要受经度、纬度、年降水量、生物结皮发育等级、电导率及海拔的影响。The soils in 0--10 cm layer and the corresponding environmental factors in 77 sampling plots of three typical shrub communities in the Gurbantunggut Desert were surveyed, and the soil stoichiometric characteristics of soil organic carbon （C）, total nitrogen （N）, total phosphorus （P） and total potassium （K） and their influencing factors were studied. The results showed that the average soil C, N, P and K contents were 1. 057, 0. 133, 0. 319 and 14. 11 g.kg 1, respectively; and the average soil C -＂ N, C ＂ P, C ＂ K, N ： P, N ＂ K and P ＂ K were 8. 124, 3. 486, 0. 099, 0. 434, 0. 013 and 0. 034, respectively. By contrast, the soil nutrient contents and their stoichiometric ratios were far lower than global and Chinese levels. The soil C ＂ N and P represented high stability （CV=19.26% and 22.46%）, while soil K, C ＂ K, N ＂ K and P ＂ K showed moderate variability （CV^--52. 17 %- 80.30 % ）. The soil stoichiometric traits differed to a certain extent in different community types and in different biological soil crust types. Quadratic function, power function and exponential function can be used to characterize the non-linear coupling relationships of C vs. N, C vs. K, P vs. K, and soil nutrients vs. their stoichiometric ratios. The correlation analysis and CCA or- dination indicated that, except for soil C ~ N （which was not affected by any environmental factor in this study）, the soil stoichiometric traits were mainly influenced by longitude, latitude, mean annual precipitati- on, developmental level of biological soil crust, electrical conductivity and elevation.

关 键 词：化学计量学 土壤养分 环境因子 古尔班通古特沙漠 生物结皮 

分 类 号：S153.6[农业科学—土壤学]