Effect of change in semiarid sand dune habitat on aboveground plant biomass, carbon and nitrogen

doi:10.11686/cyxb20140605

Abstract

Abstract: This study examined the characteristics of aboveground plant biomass, carbon (C) content, nitrogen (N) content and total C and N of four different habitats; mobile, semi-stable and stable dunes (three stages of sand dune stabilization) and natural grassland at Horqin, Inner Mongolia, in Northern China. The change in sand dune habitat had significant impacts on leaf dry weight, branch dry weight, total biomass, C and N contents and total C and N. Leaf and branch dry weight, total biomass, % C and N and total C and N in the fixed dune were higher than those in mobile and semi-stable dunes. Total biomass, leaf and branch dry weight, total branch C, total biomass C and total branch N in the grassland were lower than those in the stable dune, but higher than those in the mobile dune. The leaf and branch C %, total C % and total branch C in the semi-stable dune were higher than those in the mobile dune, while leaf and branch N % and total N in the semi-stable dune were lower than the mobile dune. Annual plant species separately accounted for 63.99%, 79.28%, 70.86% of the total biomass in the mobile dune, stable dune and grassland respectively, while shrubs accounted for 73.15% of the total biomass in the semi-stable dune. C₃ plant species contributed 39.99%, 90.87%, 96.01%, 82.67% of the total biomass in the mobile, semi-stable and stable dunes and grassland respectively. The biomass, total C and N of annuals and C₃ plants in the stable dune were higher than in the other habitats. In semi-stable and stable dunes and grassland, the C %, total C and N of C₃ plants were higher than those of C₄ plants. The results indicate that total biomass, C and N increase gradually during sand dune stabilization. Plants on the stable dune had greater potential to sequester C and N, mostly contributed by annuals and C₃ species. The C₃ species also provided an important buffer against the decrease in C₄ plant biomass during the sand dune stabilization process.

CLC Number:

Q945.79

ZHOU Xin,ZUO Xiao-an,ZHAO Xue-yong,WANG Shao-kun,LUO Yong-qing,YUE Xiang-fei,ZHANG La-mei. Effect of change in semiarid sand dune habitat on aboveground plant biomass, carbon and nitrogen[J]. Acta Prataculturae Sinica, 2014, 23(6): 36-44.

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