Effect of Salix cupularis plantations on soil stoichiometry and stocks in the alpine-cold desert of northwestern Sichuan

doi:10.11686/cyxb2017414

Abstract

Abstract: Based on their different plantation ages, 6, 18 and 24 yr old Salix cupularis plantations in the alpine-cold desert of Northwest Sichuan were selected to explore the nature of ecological stoichiometry changes in C, N and P under S. cupularis. The results showed that the ratio of C∶N∶P increased with plantation age in the 0-60 cm soil layer. Soil C∶N and C∶P increased with plantation age in the 20-40 cm and 40-60 cm soil layers, but the soil N∶P significantly decreased with plantation age (P<0.05). Soil organic carbon (SOC) stock increased with forest development in the 0-60 cm layers, but total N (TN) and total P (TP) stocks showed the opposite trend. SOC, TN and TP significantly increased in the 0-20 cm soil layer (P<0.05). A two-way ANOVA indicated that soil depth, plantation age and soil depth×plantation age significantly affected soil stoichiometric characteristics and stocks (P<0.01). The exceptions were soil TP contents, which did not significantly differ with plantation age, and soil C∶N and P stock, which did not significantly differ by soil depth×plantation age. The results show that imbalances in soil C∶N∶P occurred with plantation aging due to imbalances of C, N and P input.

Key words: alpine-cold desertland, Salix cupularis, C, N, P ecological stoichiometry

HE Jia, HU Yu-fu, SHU Xiang-yang, WANG Qin, JIA An-du, YAN Xing. Effect of Salix cupularis plantations on soil stoichiometry and stocks in the alpine-cold desert of northwestern Sichuan[J]. Acta Prataculturae Sinica, 2018, 27(4): 27-33.

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