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林业科学 ›› 2004, Vol. 40 ›› Issue (2): 61-67.doi: 10.11707/j.1001-7488.20040211

• 论文及研究报告 • 上一篇    下一篇

地下滴灌条件下杨树速生丰产林生长与光合特性

贾黎明 邢长山 韦艳葵 李延安 杨丽   

  1. 北京林业大学资源与环境学院,北京100083;北京市共青林场,北京101300
  • 收稿日期:2003-05-15 修回日期:1900-01-01 出版日期:2004-03-25 发布日期:2004-03-25

The Growth and Photosynthesis of Poplar Trees in Fast-growing and High-yield Plantations with Subterranean Drip Irrigation

Jia Liming,Xing Changshan,Wei Yankui,Li Yan'an,Yang Li   

  1. College of Resources and Environment in BFU Beijing100083;Gongqing Forest Centre of Beijing Beijing101300
  • Received:2003-05-15 Revised:1900-01-01 Online:2004-03-25 Published:2004-03-25

摘要:

研究了北京沿河沙地I-214杨树人工林地下滴灌和常规灌溉林地树木生长与光合特性,结果表明:与常规灌溉相比,地下滴灌能大大增加树木的生长量,提高林地生产力。2000年(栽植第4年) ,地下滴灌区树木平均胸径、树高和单株材积分别达到21.18cm、14.23m和0.1815m3,比常规灌溉增加了54.5 %、36.9%和247.6 % ;林地生产力达到22.78~25.81m3·hm-2 a-1 ,比常规灌溉增加了3.9~4.6倍。树木生长改善和林地生产力提高的生理机制是地下滴灌可促进树木光合作用和水分利用效率。地下滴灌区树木叶净光合速率在一天中几乎一直显著高于对照,幅度达10.0 %~21.4 % ;从一个滴灌周期来看,滴灌区树木叶净光合速率显著高于对照9.0%~9.9% ;滴灌区树木水分利用效率也较对照区显著提高。通过相关分析表明,表层土壤(15~25cm)水分含量在5%~8%时树木叶净光合速率能在长时间维持较高水平,而水分含量低于4% ,树木叶净光合速率将降低。建议在干旱半干旱和季节性干旱地区营造速生丰产用材林时应结合当地经济条件推广地下滴灌技术,这不仅有利于水资源的可持续利用,而且将大幅度提高林地生产力,使我国人工林生产力赶超世界先进水平。

关键词: 杨树, 速生丰产人工林, 地下滴灌, 林地生产力, 光合作用

Abstract:

The growth and photosynthesis of I-214 poplar trees (Populus×euramericana cv. 'I-214 ') in the plantations with subterranean drip irrigation(SDI) and normal irrigation(NI) on sandy soil in Beijing were studied in this paper. The results showed that: the growth and yields of the plantations were more increased on SDI than on NI. In 2000 (4 years after planting), the average D1.3 , H and volume per tree were 21.18cm, 14.23m and 0. 1815m3 on SDI,54.5%、36.9% and 247.6% more than on NI; The yields of the plantations with SDI reached 22.78~25.81m3·hm-2 a -1 which were 3.9~4.6 times as much as that with NI. The physiological mechanism of improving the growth of trees and increasing the productivity of forest land was the subterranean drip irrigation,by which the photosynthesis and water use efficiency of trees grown in the plantation would be promoted. The net photosynthetic rate of leaves for poplar trees irrigated with SDI was still significant higher than that with NI in the different time of a day, ranged from 10.0%~21.4%. During an irrigation cycle, the net photosynthetic rate of leaves with SDI was also significant higher than that with NI, ranged from 9.0%~9.9%. Water use efficiency of trees with SDI was also higher than that with NI. The correlativity study showed that the net photosynthetic rate of poplar trees leaves could contain a high level for a long time when the water content of subsurface soil (15~25cm) was 5%~8%; but it would be decreased when the water content was lower than 4%. At last, extending the subterranean drip irrigation in developing the fast-growing and high-yield plantations in arid, semi-arid area, and season arid area was suggested according to the local economic condition. It could not only accelerate the sustainable usage of water resources, but also could increase the plantation productivity and make it reach the high level of the world.

Key words: Poplar, Fast growing and high-yield plantation, Subsurface drip irrigation, Plantation yield, Photosynthesis