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

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

JOURNAL OF DESERT RESEARCH ›› 2017, Vol. 37 ›› Issue (2): 305-314.DOI: 10.7522/j.issn.1000-694X.2016.00087

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

Tao Ye^1,2, Wu Ganlin¹, Liu Yaobin³, Zhang Yuanming²

1. College of Life Sciences/The Province Key Laboratory of the Biodiversity Study and Ecology Conservation in Southwest Anhui, Anqing Normal University, Anqing 246133, Anhui, China;
2. Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
3. Bureau of Industry and Information Technology of Guyuan, Guyuan 756000, Ningxia, China

Received:2016-03-03 Revised:2016-06-07 Online:2017-03-20 Published:2017-03-20

Abstract

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

CLC Number:

S153.6

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

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