准格尔盆地梭梭天然更新幼苗空间格局与影响因子

Spatial Pattern and Influence Facotrs of Natural Regeneration of Haloxylon ammodendron Seedlings in Zhungeer Basin

以吉木萨尔县和玛纳斯县的天然梭梭荒漠林的更新幼苗为研究对象,运用多尺度的点格局分析方法研究了准格尔盆地南缘天然梭梭更新幼苗的格局分布及影响因子。结果表明:吉木萨尔县梭梭幼苗格局聚集强度较大,且在0-10m连续尺度上呈聚集分布,聚集程度随距离增加先增强后减弱;玛纳斯县的梭梭幼苗格局在0-7.2m的连续尺度上都是聚集分布,聚集强度随尺度变大而降低;样地中梭梭幼苗数量吉木萨尔县是玛纳斯县的10倍以上。结合气象数据得知梭梭种子萌发和幼苗的生长的关键因素是11月、12月及来年4月、5月的降水量,且降水量在15mm以上有利于梭梭种子的萌发和幼苗生长。

Taking the natural forest of Haloxylon desert seedlings in Jimsar County and Manasi County as the research object,the pattern distribution and influence factors of natural Haloxylon ammodendron seedlings in the southern margin of the Zhungeer Basin were studied by multi-scale-point-pattern analysis method.The results showed that the aggregation intensity pattern of Haloxylon ammodendron seedlings in Jimsar County was larger and continuously distributed on the scale of 0-10m,and the degree of aggregation increased first and then weakened with the increase of distance.The aggregation intensity pattern in Manasi County was aggregation distribution in the continuous scale of 0-7.2m,theaggregation intensitydecreased with the increasing scale.The number of sample plots in Jimsar County was more than 10 times than that of Manasi County.Combined with meteorological data,the key factor of seed germination and seedling growth was the precipitation in November and December and April and May of the coming year,and precipitation with over 15mm was favorable for seed germination and seedling growth.