轻度沙埋对典型荒漠植物的影响北大核心CSCD

中国西北干旱区以荒漠生态系统为主体,是中国典型脆弱生态系统。沙埋对该区域植物生存和生长、植被分布和组成以及荒漠生态系统功能和结构有重要影响。以典型荒漠植物梭梭(Haloxylon ammodendron)、柽柳(Tamarix chinensis)、白刺(Nitraria tangutorum)、沙拐枣(Calligonum mongolicum)为研究对象,对比研究了轻度沙埋和非沙埋植物在生理和生长方面的差异,并从土壤盐分、土壤水分、土壤温度等方面探究了造成这种差异的原因。结果表明:轻度沙埋环境下,梭梭、柽柳、白刺、沙拐枣的光合速率普遍高于非沙埋植株,蒸腾速率显著低于非沙埋植株,水分利用效率也均高于非沙埋植株。轻度沙埋梭梭、柽柳、沙拐枣、白刺株高明显低于非沙埋植株,但地径、冠幅、叶面积指数普遍高于非沙埋植株。主要原因是轻度沙埋植物下方土壤黏粒含量、土壤湿度高于非沙埋植物下方,轻度沙埋植物下方土壤温度、含盐量低于非沙埋环境。

Effects of sand burial on typical desert plants

Desert ecosystem is the major components in the arid area of Northwest China， which is one of the most typical fragile ecosystems. Sand burial has an important impact on the survival and colonization of plant， distribution and composition of vegetation in this area， as well as the function and structure of desert ecosystem. This study compared the physiological and growth differences of the typical desert plants， Haloxylon ammodendron， Tamarix chinensis， Nitraria tangutorum and Calligonum mongolicum under light sand burial and no sand burial， and explored the reasons for the differences from the aspects of soil salinity， soil moisture and soil temperature. The results showed that the photosynthetic rate of H. ammodendron， T. chinensis， N. tangutorum and C. mongolicum under sand burial were generally higher than that of no sand burial， and the transpiration rate was significantly lower than that of no sand burial， and the water use efficiency was also higher than that under no sand burial. The plant height of H. ammodendron， T. chinensis，C. mongolicum and N. tangutorum under sand burial was significantly lower than that of no sand burial， but the ground diameter， crown width and leaf area index were generally higher than those of no sand burial. The main reason was that soil clay content and soil moisture under sand burial were higher than those under no sand burial. Whereas soil temperature and soil salt under sand burial was lower than that under no sand burial. The research can provide a theoretical basis for vegetation reconstruction and restoration in desert.