摘要
为了了解沙漠植物梭梭维持水源的利用情况,探明其对水源的利用策略,利用稳定性同位素技术定位取样,对准噶尔盆地南缘荒漠区梭梭进行了研究。结果表明,冬季,梭梭基本没有直接利用降雪;随着融雪后浅层土壤含水率的上升,梭梭明显利用浅层土壤水;梭梭利用水源中,地下水占有很大比例,这种比例在冬季和夏季最高,最高幅度可达到80%,平均占到30%左右;降雨也是梭梭利用的水源之一,在降雨后的3～5d内,梭梭木质部δ18 O值有明显趋近降雨δ18 O值的趋势。因此,本研究区的梭梭维持水源有多个途径,地下水、融雪形成的浅层土壤水是其主要水源,中、大量降雨也是其利用的水源之一。
In order to learn about the maintaining water sources of Haloxylon ammodendron, one of the most important desert plants in central Asia, and to detect its water source use strategy, we use stable iso- tope technology and serial samples to detect the water sources of H. ammodendron at the southern edge of Junggar Basin, China. Results show that H. a）nmodendron uses little snow in winter, but it can use shal- low soil water from melted snow. The groundwater is a maintaining water sources for H. ammodendron, and the average proportion is 30 % in winter and summer, and the maximum proportion can get 80 % in wa- ter using of H. ammodendron. Moderate and heavy rainfall also influences this kind of plant. In 3--5 days after heavy rainfalls, the 8180 value of H. ammodendron xylem approaches the 8180 value of rainfall. This shows that H. ammodendron has different maintaining water sources. Groundwater and shallow soil water from melt snow are the most important water sources. Moderate and heavy rainfall is also one of important water sources.
出处
《中国沙漠》
CSCD
北大核心
2013年第1期110-117,共8页
Journal of Desert Research
基金
国家自然科学基金项目(30870472
31000195)
中国科学院"西部之光"人才培养计划西部博士专项(XBBS201004)资助
关键词
稳定性同位素技术
维持水源
梭梭
地下水
降水变化
stable isotope technology
maintaining water
Haloxylon ammodendron
groundwater
pre-cipitation variation
