Effects of short-term nitrogen and phosphorus addition on soil labile organic carbon in desert grassland

doi:10.11686/cyxb2019234

Abstract

Abstract: In this study, nitrogen (N) and phosphorus (P) were added to desert grasslands in arid and semiarid regions. We determined the concentration and efficiency of dissolved organic carbon (DOC), microbial biomass carbon (MBC), and easily oxidized organic carbon (EOC), and we calculated carbon management indicator (CMI) and sensitivity index (SI) values. The results showed that nutrient addition (N, P, and N+P) significantly increased the soil DOC concentration in the 0-20 cm layer, but did not affect the soil MBC concentration in the 0-20 cm layer. The soil EOC concentration in the 0-10 cm layer was significantly increased by the addition of N+P. In the 0-30 cm layer, all sensitivity indexes of soil DOC were higher than those of soil EOC, indicating that soil DOC was more sensitive than soil EOC to short-term N and P addition. Therefore, soil DOC could be used as an indicator of the changes in SOC after short-term N and P additions to desert grassland. The CMI and soil organic matter content were increased by short-term N and P addition. These results indicate that short-term N and P addition can promote the restoration of soils in desert grassland.

Key words: nitrogen addition, phosphorus addition, desert grassland, labile organic carbon, carbon pool management index

ZHANG Ya-rou, AN Hui, LIU Bing-ru, WEN Zhi-lin, WU Xiu-zhi, LI Qiao-ling, DU Zhong-yu. Effects of short-term nitrogen and phosphorus addition on soil labile organic carbon in desert grassland[J]. Acta Prataculturae Sinica, 2019, 28(10): 12-24.

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