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Spatiotemporal variation characteristics and influencing factors of protection forests after their 30 years construction in Northwest Shanxi Province of China.

LI Xiu-fen1, SU Lei2, ZHANG Jin-xin3, ZHANG Ze-xiu1, LIU Li-min1**, LIU Xue-feng1   

  1. (1Shenyang Agricultural University; Shenyang 110866, China; 2Northeast Forestry University; Haerbin 150036, China; 3Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China)
  • Online:2013-09-10 Published:2013-09-10

Abstract: In order to understand the variation characteristics of the protection forests after their 30 years construction in Northwest Shanxi Province of China, the remote sensing images of Northwest Shanxi in 1980, 1990, 2000 and 2007 were used for visual interpretation, and the spatiotemporal variation characteristics of the protection forests and related driving forces were analyzed. There were no significant variations in the spatial pattern of the protection forests during the 30 years. Among the protection forests, shrub forests dominated (about 50% of the total), and coniferous-broadleaved mixed forests took the least percentage (<10%). The total area of the protection forests during the 30 years presented a decreasing trend, with the annual variation rate in 1980-1990, 1990-2000, and 2000-2007 being -2.04%, 0.62%, and -0.029%, respectively. The variations of the protection forests were dominated by the conversions among woodland, farmland, and grassland, followed by the conversions among different woodland types. Policy was the main factor causing the variation of woodland. In addition, surface water conditions and human disturbances also played important roles in the variations of protection forests in the study region.

Key words: combined effect, elevated Cd2+, elevated Zn2+, tobacco, antioxidant system.