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修枝对杉木人工林树干表面和土壤CO2释放通量的短期影响

刘兰兰1,2,3,汪思龙1,2**,杨庆朋1,2   

  1. 1中国科学院沈阳应用生态研究所森林与土壤生态国家重点实验室, 沈阳 110016; 2湖南会同森林生态系统国家野外科学观测研究站, 湖南会同 418307; 3中国科学院大学, 北京 100049)
  • 出版日期:2014-06-10 发布日期:2014-06-10

Short-term effects of pruning on stem surface and soil CO2 effluxes in a Chinese fir plantation.

LIU Lan-lan1,2,3, WANG Si-long1,2**, YANG Qing-peng1,2   

  1. (1State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2Huitong National Research Station of Forest Ecosystem, Huitong 418307, Hunan, China; 3University of Chinese Academy of Sciences, Beijing 100049, China)
  • Online:2014-06-10 Published:2014-06-10

摘要: 树干表面和土壤CO2释放通量是森林生态系统碳循环的重要组成部分,但修枝措施对其如何影响还不太清楚。本文以杉木纯林为研究对象,通过修枝处理(对照、轻度修枝和重度修枝)改变光合产物供应,探讨其对树干表面CO2通量和土壤CO2通量产生的影响。在研究区内使用LI-6400-09便携式光合系统连续一个月测量树干表面和土壤CO2通量。结果表明:修枝对树干表面CO2通量并没有显著影响,尽管日最大液流略有下降。修枝轻微降低了土壤CO2通量,轻度修枝和重度修枝的土壤CO2通量相对于对照分别下降了11.8%和17.9%,但统计并不显著。因此,修枝对树干表面和土壤CO2通量的短期影响有限。

关键词: 集对分析, 农户生计, 障碍度, 脆弱性, 海原县

Abstract: Carbon dioxide releases from stem surface and soil are important parts of forest ecosystem carbon cycle, but how pruning treatment impacts stem surface and soil CO2 effluxes is unclear. In this paper, we examined the effect of photosynthate supply on stem surface and soil CO2 effluxes in a Chinese fir plantation forest by pruning branches (CK, light pruning, and heavy pruning). Stem surface and soil CO2 effluxes were measured with the LI-6400-09 portable photosynthesis system for a month. The results showed that pruning had no significant effect on stem surface CO2 efflux, although the maximum sap flow velocity decreased slightly. Pruning treatment decreased soil CO2 efflux slightly, with reductions by 11.8% and 17.9% for light and heavy pruning treatments, respectively compared to the control. However, there was no significant difference among the three treatments. Our results indicated that shortterm effects of pruning on stem surface and soil CO2 effluxes were negligible in the Chinese fir plantation forest.

Key words: obstacle degree, vulnerability, Haiyuan County, set pair analysis, agro-household livelihood