太行山南麓山区栓皮栎-扁担杆生态系统水分利用策略

被引：11

作者：

孙守家 ^{[1
]}

孟平 ^{[1
]}

张劲松 ^{[1
]}

贾长荣 ^{[2
]}

任迎丰 ^{[2
]}

机构：

[1] 中国林业科学研究院林业研究所,国家林业局林木培育重点实验室

[2] 济源市国有大沟河林场

来源：

生态学报 | 2014年 / 34卷 / 21期

关键词：

栓皮栎; 扁担杆; 氢氧稳定同位素; Iso Source模型; 水分利用;

D O I：

暂无

中图分类号：

S718.5 [森林生态学];

学科分类号：

071012 ; 0713 ;

摘要：

分析了太行山南麓低丘山区降水、泉水、地下水、土壤水以及栓皮栎、扁担杆的氢氧稳定同位素特征,结合Iso Source模型确定了栓皮栎和扁担杆水分来源的季节性差异,并对栓皮栎和扁担杆水分利用策略进行分析。结果表明,同一生态系统中的栓皮栎和扁担杆枝条水的δ18O和δD值差别明显。雨季中栓皮栎和扁担杆水分来源较浅,以0—20 cm土壤水分为主,但旱季中栓皮栎和扁担杆水分主要来源均比雨季明显加深,其中栓皮栎主要利用40—60 cm土壤水分,扁担杆则主要利用20—40 cm土壤水分。此外,旱季后期栓皮栎还利用部分泉水,其比例达到了19.6%。二者水分来源的不同,使得栓皮栎与扁担杆在旱季期间能避开用水冲突。旱季中生长在生态系统上层的栓皮栎中午部分气孔关闭,蒸腾速率下降,生长在生态系统下层的扁担杆日均蒸腾速率、气孔导度则分别比栓皮栎下降了46.94%和30.58%。栓皮栎和扁担杆分别采取了深水源及部分气孔关闭和浅水源及低蒸腾耗散的水分利用策略来利用旱季中有限的水分,因而其组成的生态系统表现出较强地适合太行山南麓脆弱环境的生态适应性。

引用

页码：6317 / 6325

页数：9

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