摘要
以新疆准噶尔盆地南缘当年生梭梭实生苗为研究对象,采用定性和定量相结合的研究途径,分析在气候变化的背景下,实生苗从萌发到入夏前的动态。梭梭种子依赖融雪水为萌发水源,其时地表湿润状况将影响当年幼苗的出土;含清明节为中点的一周内,气温高低及其变化缓急是决定梭梭实生苗存活与否的关键时期。实生苗从子叶到3对真叶期表土5 cm内的含水状况是其存活的制约因素;微地形、地被物或枯落物及在适度覆沙下的淤积土似有助于实生苗的存活,可能通过有关因子削弱气象因素对立地的影响,特别是减缓浅土层水分的波动,从而提高实生苗入夏前的存活率。
This paper studied dynamics of Haloxylon ammodendron （and Haloxylon pespicum） seedlings before summer on background of climate change in the southern edge of Zhunger Basin by qualitative and quantitative ways. Taking snow melted water as source to sprout the number of Haloxylon ammodendron seedlings is determined by surface soil moisture in early Spring. Whether the seedlings are survival or not are due to the temperature level and its changing amplitude in the week of Qingming Festival. Besides, the seedlings survival is limited by surface soil water with 0-5 cm depth during period from cotyledon to three couples. To some extent, microterrain, cover on soil could protect Haloxylon ammodendron seedling at this time, which may be the effect of mitigating influence of climate on habitat so that more water could be used by the seedling.
出处
《中国沙漠》
CSCD
北大核心
2009年第1期87-94,共8页
Journal of Desert Research
基金
国家自然科学基金项目(30070640)
“973”项目(G19990435)共同资助
关键词
梭梭实生苗
气候变化
土壤水分
生境
Haloxylon ammodendron seedling
climate change
soil water
habitat
