民勤荒漠灌丛草地植物群落动态与降水量的关系研究

为了研究民勤荒漠植被退化过程中荒漠灌丛草地植物群落动态,运用相关分析方法并结合卡平方检验方法,以样方观测资料分析了民勤荒漠灌丛草地植物群落动态与降水量之间的相关关系.结果表明,民勤荒漠草场植被盖度随年际降水量变化明显.优势种植物高度与7月下旬-9月下旬的降水量之间存在较大的正相关;草本植物平均盖度与7月下旬-9月下旬和5月下旬-7月下旬的降水量之间存在较大的正相关.全年降水量主要影响植被盖度.5月下旬-7月下旬的降水量对植被的影响较全年降水量更为明显.

Study on the relationship between development of plant community and rainfall in the desert shrub grassland of Minqin

The dynamic change of plant community in desert shrubby grassland was studied during deterioration of desert vegetation of Minqin, the correlativity between the dynamic change of plant community and precipitation was analyzed according to the plot dada through the method of relative analysis and X2 test. The result shown that the vegetation coverage changed obviously with the fluctuant annual precipitation. The correlativity between height of dominant plants and precipitation during the last ten-days of July to the last ten-days of September was positive. And it was same between the average coverage of herbaceous plants and the precipitation in the last ten-day of May to the last ten-days of July. The annual precipitation affected the total coverage of plant community. The effect of precipi- tation in the last ten-day of May to the last ten-day of September was more obvious compared with annual precipitation.