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通过比较不同自然降水年份(极端干旱和极端湿润)19年生疏林草地樟子松的针叶δ13C、比叶面积和干物质含量,结合土壤含水量和地下水埋深,探讨了极端降水对樟子松水分利用的影响.结果表明:干旱年份(2009)樟子松林土壤含水量显著低于湿润年份(2010),但樟子松当年生针叶的δ13C在两年间没有显著差异,且两年相同月份间亦无显著差异;干旱年份当年生针叶的比叶面积显著低于湿润年份,而不同年份间干物质含量的差异不显著.在两种极端降水条件下,樟子松的水分利用效率没有明显变化,主要通过改变当年生针叶的比叶面积来适应降水量的变化.对于地下水埋深高于3.0m的疏林草地樟子松人工林生态系统,极端干旱不会严重影响樟子松的存活和生长.
By comparing δ13C, specific leaf area and dry matter content of Pinus sylvestris var.mongolica with 19 years of uncultivated grassland in different years of natural precipitation (extreme drought and extremely humid), combined with soil moisture content and groundwater depth, the effects of extreme precipitation on Pinus sylvestris The results showed that the soil water content of Pinus sylvestris var.mongolica was significantly lower in wet years (2009) than that in humid years (2010), but the δ13C of Pinus sylvestris var.mongolica had no significant difference in two years and the same in two years There was no significant difference between the two months; the specific leaf area of needles in annual year was significantly lower than that in wet year, while the difference of dry matter content was not significant in different years.Under two extreme precipitation conditions, the water use efficiency No significant changes, mainly by changing the specific leaf area of annual needles to adapt to changes in precipitation.For groundwater depth of more than 3.0m sparse grassland Pinus sylvestris plantation ecosystem, extreme drought will not seriously affect the Pinus sylvestris Pine survival and growth.