呼伦贝尔沙地杨柴林更新复壮影响因素分析

Analysis of Influencing Factors of Regeneration and Rejuvenation of Hedysarum mongolicum Forest in Hulunbuir Sandy Land

通过对呼伦贝尔沙地杨柴林更新复壮影响因素进行的分析研究,结果表明:(1)平茬更新对杨柴林更新复壮影响较大,适宜的平茬可明显促进杨柴萌发,提高生长量,加快杨柴林自我更新速度。(2)人工封育措施对植物生长和自然更新都有较好的促进作用,减少了人畜的破坏,提高生长量,增加覆盖度,但随着林龄的增加,人工植被出现老化、生长缓慢或生长停滞,甚至濒临死亡等生态功能减弱现象。(3)降水量对杨柴林更新复壮有显著影响,降水量的季节变化对植物的生长有很大影响,由于该地区降水多集中在生长季节,形成明显的雨热同季现象。降水量与杨柴生长量呈正相关关系,即降水量大则生长量大,降水量小则生长量小。

Through the analysis and research on the influencing factors of regeneration and rejuvenation of Hedysarum mongolicum forest in Hulunbuir sandy land,the results showed as the following three aspects.(1)The flat stubble regeneration had a great impact on the regeneration and rejuvenation of the Hedysarum mongolicum forest.The suitable flat stubble could obviously promote the germination of the Hedysarum mongolicum,increase the growth,and accelerate the self-renewal speed of the forest.(2)The artificial enclosure measures had a good promotion effect on plant growth and natural regeneration,reducing the damage of human and livestock,increasing the growth and coverage,but with the increase of forest age,the artificial vegetation appeared aging,slow growth or growth stagnation,and even close to death and other ecological functions weakening.(3)Precipitation had a significant impact on the regeneration and rejuvenation of the Hedysarum mongolicum forest and the seasonal variation of precipitation had a great impact on the growth of plants.Because the precipitation in this region was mostly concentrated in the growing season,the obvious phenomenon of rain and heat in the same season was formed.There was a positive correlation between precipitation and the growth of Hedysarum mongolicum,that was,large precipitation meant large growth,and small precipitation meant small growth.