民勤荒漠绿洲过渡带天然白刺群落多样性及其对降雨的响应

Diversity of Natural Nitraria tangutorum Shrub Community in Minqin Desert Oasis Transition Zone and Its Response to Rainfall

为了解降水对白刺灌丛生物多样性的影响,在民勤青土湖绿洲-荒漠过渡带流动沙丘和半固定沙丘上设立固定样地并进行生物多样性调查,结合年降水量,利用统计学原理和方法开展白刺灌丛群落对降雨的响应研究.结果表明:在流动沙丘和半固定沙丘中,白刺群落组成对降水的响应明显;在白刺群落中,1年生草本对降雨响应强烈,多年生草本和灌木半灌木对降雨响应不显著;群落中植物种数、物种植株数量对降雨响应强烈;白刺冠幅、当年生长量、盖度与降水量均成正相关关系.

In order to understand the impact of precipitation on the biodiversity of Nitraria tangutorum shrub,fixed plots were set up on the wandering dunes and semi-fixed dunes in the desert transition zone of Qingtu Lake Oasis in Minqin.Combined with annual precipitation,the response of Nitraria tangutorum shrub community to rainfall was studied by using statistical principles and methods.The results showed as follows:the response of Nitraria tangutorum community composition to precipitation was obvious in wandering dunes and semi-fixed dunes;in the Nitraria tangutorum community,the one-year herbs had a strong response to rainfall,while perennial herbs,shrubs,and subshrubs had no significant response to rainfall;the number of plant species and species plants in the community responded strongly to rainfall;there was a positive correlation between crown width,annual growth,coverage of Nitraria tangutorum and precipitation.