【摘要】 2003年7~10月,选择黄土丘陵区荒漠草原地带两个相似生境、5个不同干扰特征的中幼龄红砂种群更新恢复类型区为研究对象,采用系统取样法或样行法,开展了干扰条件下的红砂种群种子更新与恢复机理的初步研究。结果表明,红砂种子更新恢复能力与干扰水平呈正相关;干扰因子的特征不同,则更新恢复能力不同;尤其水分因子参与对红砂种群的自然更新与人工辅助恢复起着关键性的作用。以更新密度作为参数,其数值依次为:灌溉+整地+自然更新最大,平均为13.04丛/m2,变化在3~28丛/m2之间;无灌溉+整地+人工种植恢复平均为1.66丛/m2,变化在1~20丛/m2之间;无灌溉+整地+自然更新恢复平均为1.11丛/m2,变化在0.5~17丛/m2之间;无灌溉+破土+自然更新平均为0.255丛/m2,变化在0.1~3.0丛/m2之间;无干扰自然更新平均为0.012丛/m2。更多还原

【Abstract】 The mechanism about seed actual reproduction and artificial restoration under disturbance was investigated by using systematic sampling in the typical area of Reaumuria soongorica population at mid-young age in desert grassland region, according to two similar habitate involved five different disturbance characteristics. The results showed that the capability of Reaumuria soongorica in seed actual reproduction and artificial restoration was positively correlated with disturbance levels; the capability of restoration varied with the characteristics of disturbance factors, of which water was the key factor. The actual reproduction and artificial restoration density were the biggest with the treatment of irrigation+soil preparation+natural regeneration, and the average numerical value was 13.04 clumpes/m2 ranging from 3 clumpes/m2 to 28 clumpes/m2.The others were as follows: 1.66 clumpes/m2 occurred in the treatment of unirrigation+soil preparation+artificial regeneration, ranging from 1 clumpe/m2 to 20 clumpes/m2; 1.11 clumpes/m2 occurred in the treatment of unirrigation+soil preparation+natural regeneration, ranging from 0.5 clumpe/m2 to 17 clumpes/m2; 0.255 clumpe/m2 occurred in the treatment of unirrigation+break ground+natural regeneration, ranging from 0.1 clumpe/m2 to 3.0 clumpes/m2, and 0.012 clumpe/m2 occurred in the treatment without disturbance.更多还原