华南丘陵植被恢复先锋树种木荷与马占相思的水分利用

应用生态学报

华南丘陵植被恢复先锋树种木荷与马占相思的水分利用

张振振^1,2,赵平^1**,倪广艳¹,朱丽薇¹,赵秀华^1,2,赵培强^1,2,牛俊峰^1

(¹中国科学院华南植物园, 广州 510650; ²中国科学院大学, 北京 100049)

出版日期:2014-04-18 发布日期:2014-04-18

Water use of re-vegetation pioneer tree species Schima superba and Acacia mangium in hilly land of South China.

ZHANG Zhen-zhen^1,2, ZHAO Ping¹, NI Guang-yan¹, ZHU Li-wei¹, ZHAO Xiu-hua^1,2, ZHAO Pei-qiang^1,2, NIU Jun-feng^1

(¹South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China; ²University of Chinese Academy of Sciences, Beijing 100049, China)

Online:2014-04-18 Published:2014-04-18

摘要/Abstract

摘要：

利用Granier测定系统,对华南丘陵植被恢复先锋树种马占相思和木荷的树干液流分别进行4 a(2004—2007年)和5 a(2008—2012年)监测,比较不同龄级两树种的蒸腾量及其季节变化.结果表明: 马占相思和木荷的年蒸腾量均随树龄增加而增大,木荷蒸腾量的增加速度更快.木荷平均整树年蒸腾量为7014.76 kg,比马占相思(3704.97 kg)高;马占相思蒸腾量的季节变异(511.46～1802.17 kg)比木荷(1346.48～2349.35 kg)大.蒸腾速率(E_h)与光合有效辐射(PAR)、水汽压亏缺(VPD)的标准回归系数随土壤湿度的增加而增大,表明土壤水分的增加提高了植物对环境响应的敏感度.偏相关分析表明,土壤湿度的季节变异是导致两树种蒸腾量季节变化的最主要因素.木荷和马占相思的最适土壤湿度分别为0.22～0.40和0.29～0.30(V/V),表明与外来树种马占相思相比,乡土树种木荷对水分胁迫有更好的适应及调节能力.

Abstract: The xylem sap flows of two pioneer tree species, i.e., Acacia mangium and Schima superba, in degraded hill lands of South China, were continually monitored with Granier’s thermal dissipation probes during 2004-2007 and 2008-2012, respectively, and their seasonal transpiration changes at different tree age levels were compared. The results showed that the annual transpiration of both species increased with tree ages, and S. superba demonstrated a higher value than A. mangium. The average annual wholetree transpiration of S. superba (7014.76 kg) was higher than that of A. mangium (3704.97 kg). A. mangium (511.46-1802.17 kg) had greater seasonal variation than S. superba (1346.48-2349.35 kg). The standard regression coefficients (β) of transpiration (E_h), photosynthetically active radiation (PAR) and vapor pressure deficit (VPD) for both species increased with soil moisture, suggesting the increase of soil moisture generated a greater sensitivity of plants to environmental factors. Partial correlation analysis revealed that soil moisture played an important role in the seasonal variation of transpiration of both species. The optimum soil moistures of S. superba and A. mangium were 0.22-0.40 and 0.29-0.30 (V/V), respectively, indicating the native pioneer species S. superba better adapted to water deficit compared with exotic pioneer species A. mangium.

张振振1,2,赵平1**,倪广艳1,朱丽薇1,赵秀华1,2,赵培强1,2,牛俊峰1. 华南丘陵植被恢复先锋树种木荷与马占相思的水分利用[J]. 应用生态学报.

ZHANG Zhen-zhen1,2, ZHAO Ping1, NI Guang-yan1, ZHU Li-wei1, ZHAO Xiu-hua1,2, ZHAO Pei-qiang1,2, NIU Jun-feng1. Water use of re-vegetation pioneer tree species Schima superba and Acacia mangium in hilly land of South China.[J]. Chinese Journal of Applied Ecology.