贝壳堤岛不同生境下柽柳水分来源比较

生态学杂志

贝壳堤岛不同生境下柽柳水分来源比较

朱金方^1,2,3,刘京涛^2*,孙景宽^2,赵艳云²,陆兆华^2,3,李俊生^1#br#

(¹中国环境科学研究院生物多样性研究中心，北京 100012； ²滨州学院山东省黄河三角洲生态环境重点实验室，山东滨州 256600； ³中国矿业大学(北京)恢复生态研究所，北京 100083)

出版日期:2017-08-10 发布日期:2017-08-10

Water sources for Tamarix chinensis Lour. in different habitats on Chenier Island.

(¹Biodiversity Research Center, Chinese Research Academy of Environmental Science, Beijing 100012, China; ^2 Shandong Provincial Key Laboratory of EcoEnvironmental Science for Yellow River Delta, Binzhou University, Binzhou 256600, Shandong, China; ^3 Institute of Restoration Ecology, China University of Mining and Technology, Beijing 100083, China).

Online:2017-08-10 Published:2017-08-10

摘要/Abstract

摘要： 柽柳是黄河三角洲贝壳堤岛内主要的优势物种之一，在贝壳堤岛上分布范围最为广泛。为确定柽柳的水分利用方式，选择了2个不同生境（近海侧和滩脊）进行比较研究。该研究以稳定同位素技术为主要手段，测定了不同生境和降水条件下土壤含水量、含盐量及潜在水源和柽柳木质部水δ¹⁸O值，并利用IsoSource软件计算各潜在水源对柽柳木质部水分的平均贡献率。结果表明：在降雨充沛的2013年7月，近海侧柽柳木质部水中90.9%来源于20～40 cm土壤水，而滩脊柽柳木质部水中51.2%来源于60～100 cm土壤水；在降雨量较低的2014年7月，近海侧柽柳木质部水的58.4%来源于20～60 cm土壤水，而滩脊柽柳67.0%木质部水来源于浅层地下水；由于受土壤水盐含量的影响，近海侧柽柳的水分来源较滩脊柽柳浅。因此，在不同生境和降雨条件下，柽柳的主要水分来源明显不同。研究表明，柽柳能通过改变自身的主要水分来源适应生境和降水条件的变化，柽柳的这种水源变换能力有利于提高其在种间竞争中的竞争优势，同时对于逆境条件下贝壳堤岛生态系统稳定性的维持具有重要意义。

关键词: 有效供给, 供给侧改革, 生态产品, 规模效率

Abstract: Tamarix chinensis is one of dominant species and widely distributed in the Chenier Island of the Yellow River Delta. To detect the water use patterns of T. chinensis, we conducted a comparative study at two habitats, seaside and dune crest. Soil moisture, soil salinity and oxygen isotope compositions in the xylem water of T. chinensis were measured during two plant growth seasons. The IsoSource model was used to calculate the feasible contributions of potential water sources to T. chinensis xylem water. In July 2013 with high precipitation, 90.9% of the xylem water in T. chinensis at the seaside was from the 20-40 cm soil layer, while 51.2% of the xylem water at the dune crest was from the 60-100 cm soil layer. In July 2014 with low precipitation, 58.4% of the xylem water at the seaside was from the 20-60 cm soil layer and 67.0% of the water at the dune crest from shallow groundwater. In addition, T. chinensis at the dune crest took up deeper water source than at the seaside because of the difference of soil and groundwater salinity. Thus, the water sources of T. chinensis varied with habitats and precipitation. These results suggested that T. chinensis could adapt to variable habitats and precipitation by altering the water use patterns, which benefits its competition capability for water resources and the maintenance of ecosystem stability of the Chenier Island under stresses.

Key words: supply-side reform, scale efficiency, effective supply, eco-product

朱金方1,2,3,刘京涛2*,孙景宽2,赵艳云2,陆兆华2,3,李俊生1. 贝壳堤岛不同生境下柽柳水分来源比较[J]. 生态学杂志.

ZHU Jin-fang1,2,3, LIU Jing-tao2*, SUN Jing-kuan2, ZHAO Yan-yun2, LU Zhao-hua2,3, LI Jun-sheng1. Water sources for Tamarix chinensis Lour. in different habitats on Chenier Island.[J]. cje.