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应用生态学报 ›› 2018, Vol. 29 ›› Issue (7): 2330-2338.doi: 10.13287/j.1001-9332.201807.034

• 研究报告 • 上一篇    下一篇

南亚热带红锥和马尾松人工林生长对穿透雨减少的响应

陈琳1,2,3, 刘世荣4*, 温远光1, 曾冀2, 李华2, 杨予静4   

  1. 1广西大学, 南宁 530004;
    2中国林业科学研究院热带林业实验中心, 广西凭祥 532600;
    3广西友谊关森林生态系统国家定位观测研究站, 广西凭祥 532600;
    4中国林业科学研究院森林生态环境与保护研究所, 北京 100091
  • 收稿日期:2018-03-26 出版日期:2018-07-18 发布日期:2018-07-18
  • 通讯作者: *E-mail: Liusr@caf.ac.cn
  • 作者简介:陈 琳, 女, 1985年生, 硕士研究生. 主要从事森林生态系统养分循环研究. E-mail: daqiqiu@163.com
  • 基金资助:

    本文由中国林业科学研究院中央级公益性科研院所基金科研业务费专项资金项目(CAFYBB2017QA026)资助.

Growth responses of Castanopsis hystrix and Pinus massoniana plantations to throughfall reduction in subtropical China.

CHEN Lin1,2,3, LIU Shi-rong4*, WEN Yuan-guang1, ZENG Ji2, LI Hua2, YANG Yu-jing4   

  1. 1Guangxi University, Nanning 530004, China;
    2Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang 532600, Guangxi, China;
    3Youyiguan Forest Ecosystem Research Station, Pingxiang 532600, Guangxi, China;
    4Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091, China
  • Received:2018-03-26 Online:2018-07-18 Published:2018-07-18
  • Contact: *E-mail: Liusr@caf.ac.cn
  • Supported by:

    This work was supported by the Central Research Institutes of Basic Research and Public Service Special Operations, Chinese Academy of Forestry (CAFYBB2017QA026).

摘要: 为了预测和评估全球气候变化背景下森林生长和生产力对降水格局变化和季节性干旱的响应,以南亚热带红锥和马尾松人工林为对象,设置穿透雨减少50%和不减雨(对照)处理,开展连续3年(2015—2017年)的模拟试验,研究降雨减少对人工林胸径生长、凋落物量和叶面积指数的影响.结果表明: 与对照相比,穿透雨减少导致红锥2017年胸径增长量显著降低31.8%,而对马尾松无影响;红锥叶面积指数平均降低8.8%,马尾松叶面积指数降低7.2%或者不变;红锥林2015年枝凋落量和2017年凋落物总量分别增加29.6%和35.8%,马尾松林2015年其他树种(除了马尾松以外)叶凋落量显著减少50.7%,而其他凋落物组分无显著变化.短期穿透雨减少对人工林产生了干旱胁迫作用,这种作用存在年际变异和树种差异.

Abstract: To better predict and evaluate responses of tree growth and forest productivity to the changes of precipitation pattern and seasonal drought under global climate change scenarios, throughfall reduction experiments including 50% of throughfall and natural rainfall (control) treatments were conducted in Castanopsis hystrix and Pinus massoniana plantations of warm subtropical region over a three-year period (2015-2017). Diameter at breast height (DBH), litterfall production and leaf area index of both plantations were investigated, respectively. The results showed that throughfall reduction resulted in a 31.8% decrease of annual increment of DBH of C. hystrix in 2017 and had no significant impact on that of P. massoniana. Leaf area index under throughfall reduction decreased by 8.8% in C. hystrix plantation and decreased by 7.2% or remained unchanged in P. massoniana plantation. Branch litterfall in 2015 and total litterfall in 2017 of C. hystrix increased by 29.6% and 35.8% by throughfall reduction, but leaf litterfall of other tree species (except for P. massoniana) in P. massoniana plantation declined by 50.7% in 2015, with no significant difference for other litterfall components. In conclusion, throughfall reduction had consequences of drought stress in both C. hystrix and P. massoniana plantations, with inter-annual variation and inter-specific differences.