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选取岩溶区白云岩低倾产状多层空间类型、中倾产状多层空间类型及高倾产状多层空间类型3种根系地下生境类型中生长的优势树种白栎为对象,研究白栎叶片的δ13C值及其与各类型生境中土壤条件的关系,以及白栎水分利用效率.结果表明:3种类型中的白栎叶片δ13C值存在显著差异,表现为低倾产状多层空间类型(-26.35‰)>高倾产状多层空间类型(-26.66‰)>中倾产状多层空间类型(-27.07‰),白栎水分利用效率依次降低;白栎叶片的δ13C值与根系地下生境类型中土壤水分含量显著相关,但与土壤元素含量相关性不显著;δ13C值随土壤水分含量和肥力水平的减少而增加.
The dominant species Q. oak in the underground habitats of low-yielding dolomite multi-layered space type, middle-yielding multi-layered space type and high-yielding multi-layered space type were selected for the study. Δ13C value of leaves and its relationship with soil conditions in various habitats and water use efficiency of P. crispus were studied.The results showed that δ13C values of P. oaks were significantly different among the three types, (-26.35 ‰)> high tillering (-26.66 ‰)> mid-tillering (-27.07 ‰), and the water use efficiency of white oak decreased, There was a significant correlation between soil moisture content in subterranean habitats and soil element content. Δ13C value increased with decreasing soil moisture content and fertility level.