北方农牧交错带草地植被数量波动特征——以宁夏盐池县为例

Grassland Vegetation Quantitative Fluctuation in the Northern Farming Pastoral Zone-A Case Study of Yanchi County

为了制定北方农牧交错带草地植被恢复措施,以宁夏盐池县人工封育区为研究对象,调查了2010—2014年植被数量特征（盖度、生物量、群落高度、密度）,利用北方农牧交错带草地植被波动测度公式进行计算和分析。结果表明：（1）2010—2014年植被波动率变化范围是-0.109~0.200,整体波动率的变化并不显著,2012年的波动率为-0.109,是调查期内草地植被生长状况最差的年份,2010—2011年和2013—2014年呈现植被波动可逆性;（2）降水是影响研究区草地植被数量波动的重要生态因子,2010—2014年植被波动强度变化趋势与降水趋势大体一致,但是2012年植被波动的异常现象可能是受到了生物结皮的影响。

In order to provide reference for the evaluation of the northern farming pastoral zone of grassland vegetation restoration measures, in the Yanchi County artificial enclosure, we investigated vegetation characteristic values including coverage, biomass, community height and density from 2010 to 2014 to calculate and analyze northern farming pastoral zone using the grassland vegetation fluctuation formula. In 2010-2014, vegetation fluctuation rate ranged in -0.109-0.200, and the over- all fluctuation was not significant. The fluctuation rate in 2012 was -0.109 which was the worst year of grassland vegeta- tion, and in 2010-2011 and 2013-2014 the vegetation fluctuations were reversible. The precipitation was an important fac- tor to grassland vegetation quantitative fluctuation, the grassland vegetation fluctuation in 2010 to 2014 was consistent with early precipitation （April to June）, but the abnormal phenomenon of vegetation fluctuation in 2012 might be affected by the biological crust.