摘要
20 0 0年在山西方山 ,采用LI-62 0 0光合测定系统和LI-1 60 0稳态气孔仪 ,对不同集水措施试验地的刺槐、侧柏和苹果的生理指标进行了实地观测 ,并辅以相同树种实地盆栽苗木水分胁迫条件下的林木生理指标观测 ,研究了林木净光合速率、羧化效率、水分利用效率与土壤含水量的定量关系。结果表明 :维持刺槐、侧柏和苹果净光合作用的最佳土壤含水量分别为 1 7 1 3 %、1 5 9%和 1 6 1 1 % ,三树种维持叶片水分利用效率的最佳土壤含水量依次为 1 3 2 3 %、1 0 66%和 1 2 3 8% ;羧化效率最高时的土壤含水量临界值依次为 1 5 7%、1 5 5 %和 1 5 8% ;土壤水合补偿点分别为 4 5 5 %、3 91 %和 4 49%。上述三树种蒸腾速率所适宜的土壤含水量分别为 1 8 82 %、1 9 70 %和 1 6 3 3 %。根据集水造林的基本构思 ,可选取维持最佳叶片水分利用效率的土壤含水量临界值作为集水造林林木密度调控的土壤水分阈值和林木需水量的低限计算条件。这一指标可量化为刺槐 1 0 %～ 1 3 % ,苹果 1 0 %～ 1 2 5 % ,侧柏 9 5 %～ 1 1 %。
In this paper, physiological index of Black Locust ( Robinia pseudoacacia ), Oriental Arborvitae ( Platycladus orientalis ) and Apple ( Malus pumila ) under different soil water condition in the catchment afforestation field and under the condition of water menace was measured by portable photosynthesis system (LI-6200) and portable steady porometer (LI-1600) in Fangshan, Shanxi Province. The quantitative relation among net photosynthesis rate, carboxylation efficiency and water use efficiency with soil water content was studied. The result shows optimum soil water content keeping max net photosynthesis rate of Black Locust, Oriental Arborvitae and apple is 17 13%、15 9% and 16 11% in turn Optimum soil water content keeping better leaf water use efficiency of three kinds of tree is 13 23%、10 17% and 12 38% Soil water content is 15 7%, 15 5% and 15 8% in turn with the highest carboxylation efficiency respectively. Soil water compensation point for hydration of three kinds of tree is 4 55%, 3 91% and 4 49%. The suitable soil water content for transpiration rate of three kinds of tree is 18 82%, 19 70% and 16 33% respectively. According to the thought of catchment afforestation, the soil water content maintaining the best leaf water use efficiency can be chosen as a critical value for tree density control in catchment afforestation and the lowness value for calculating tree water requirement. This general index can be shown as 10%～13% for Black Locust, 10%～12 5% for Apple and 9 5%～11% for Oriental Arborvitae.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2003年第1期10-16,共7页
Scientia Silvae Sinicae
基金
国家自然科学基金资助项目 (3 9970 62 2 )
教育部高等院校青年骨干教师科研专项基金资助项目
