云杉矮槲寄生种子雨的时空分布格局

通过对青海省云杉矮槲寄生种子雨的研究，表明青海省黄南州麦秀林场云杉矮槲寄生种子弹射时间主要集中在每年的8月下旬至9月中旬，种子弹射盛期为12 d左右，最大雨强为124粒·m^-2·d^-1。种子弹射离种源树最大距离为15 m，大部分集中在3~7 m，且此距离下的种子雨强度占总种子雨量的70％左右，最大种子雨量集中在距种源树4~5 m的位置。不同方位的种子雨强度存在差异，可能与风向和温度有关。

Spatiotemporal Patterns of the Seed Rain of Arceuthobium sichuanense

Occurrence regularity of the seed rain of Arceuthobium sichuanense in Maixiu forest stand in Huangnanzhou of Qinghai was studied. The results showed that the ejection of seeds mainly took place during the period from the late August to the middle September, and the peak stage lasted 12 days, with the maximum rain density of 124 seeds per square meter a day. The 1 000-grain weight was about 0.4 g. Most of the ejected seeds were distributed in the 3-7 m away from the source trees, and the seed rain density was about 70% of the whole rainfall. The area with the maximum seed density was 4-5 m away from the source trees. The maximum and minimum seed rain density was distributed in west and east direction, respectively.