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

doi:10.7522/j.issn.1000-694X.2016.00087

摘要/Abstract

摘要： 对古尔班通古特沙漠3种典型灌木群落77个样地的0～10 cm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、14.11 g·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。

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

Abstract: 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 ordination 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 precipitation, developmental level of biological soil crust, electrical conductivity and elevation.

Key words: stoichiometry, soil nutrient, environmental factor, Gurbantunggut Desert, biological soil crust

中图分类号:

S153.6

陶冶, 吴甘霖, 刘耀斌, 张元明. 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[J]. 中国沙漠, 2017, 37(2): 305-314.

Tao Ye, Wu Ganlin, Liu Yaobin, Zhang Yuanming. Soil Stoichiometry and Their Influencing Factors in Typical Shrub Communities in the Gurbantunggut Desert, China[J]. JOURNAL OF DESERT RESEARCH, 2017, 37(2): 305-314.

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