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• 研究报告 • 上一篇    下一篇

不同林龄橡胶林蒸腾特征的比较

林友兴1,2,张一平1*,赵玮1,2,张翔1,2,董钰鑫1,2,费学海1,2,李敬1,2
  

  1. (1中国科学院热带森林生态学重点实验室, 西双版纳热带植物园, 云南勐仑 666303; 2中国科学院大学, 北京 100049)
  • 出版日期:2016-04-10 发布日期:2016-04-10

Comparison of transpiration characteristics in different aged rubber plantations.

LIN You-xing1,2, ZHANG Yi-ping1*, ZHAO Wei1,2, ZHANG Xiang1,2, DONG Yu-xin1,2, FEI Xue-hai1,2, LI Jing1,2   

  1. (1Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun 666303, Yunnan, China; 2University of Chinese Academy of Sciences, Beijing 100049, China)
    .
  • Online:2016-04-10 Published:2016-04-10

摘要: 于2013年1月—2014年12月,应用Granier热扩散探针对中国西南西双版纳地区13年生(幼龄期)、25年生(中龄期)、33年生(中老龄期)、50年生(老龄期)4个林龄橡胶树的液流密度进行了连续2年的观测,分析了橡胶树液流密度的变化特征,并推算了林分蒸腾量。结果表明:在日、月、季节和年尺度上,25年生橡胶树的平均液流密度均显著大于13、33和50年生(P<0.01);从年尺度上看,50年生橡胶林的蒸腾量显著大于33和13年生(P<0.01);西双版纳不同林龄橡胶树的液流密度大致呈抛物线变化,峰值出现在生命活动最旺盛的中龄期(25年生);橡胶林的蒸腾量总体上随林龄的增大而增加,最大值出现在老龄期(50年生);西双版纳地区橡胶林的年平均液流密度为16.42±3.24 g·m-2·s-1,年平均蒸腾量为870.58±145.89 mm。

关键词: 土壤水分, 氨基酸, 水溶性有机物, 氮素转化, 凋落物分解

Abstract: Sap flow density of rubber trees (Hevea brasiliensis) of four ages (13 years old, young; 25 years old, middleaged; 33 years old, middle-old-aged; and 50 years old, overmature) in Xishuangbanna of Southwest China was measured by the Granier thermal diffusion probe technique from January 2013 to December 2014, and then scaled up to estimate standlevel transpiration. The results showed that, on day, month, season and year timescales, the middleaged trees had the highest mean sap flow density, being significantly higher than the other aged trees (P<0.01). The overmature stands had the highest annual transpiration rate (1212.49±42.80 mm per year), being significantly higher than those of the young and middle aged stands (P<0.01). With the increase of stand age, the sap flow density of rubber trees generally followed a parabola change, with the peak in the most vigorous middleaged stand. The transpiration of rubber stands increased with increasing stand age in general, and the overmature stand had the highest transpiration. The mean annual sap flow density of rubber stands in Xishuangbanna was estimated as 16.42±3.24 g·m-2·s-1 and the mean annual transpiration as 870.58±145.89 mm.

Key words: water-soluble organic matter, soil moisture, litter decomposition, amino acid, nitrogen transformation