收稿日期: 2009-07-18
录用日期: 2010-01-17
网络出版日期: 2010-07-01
Inter-annual change of vegetation productivity and its driving factors in the Liaohe Delta, northeastern China
Received date: 2009-07-18
Accepted date: 2010-01-17
Online published: 2010-07-01
基于辽河三角洲14年的水稻(Oryza sativa)与玉米(Zea mays)产量、42年的芦苇(Phragmites australis)产量及相应的气候、农业人口、灌溉和施肥等资料, 主要利用主成分分析、简单相关分析和偏相关分析, 阐述了辽河三角洲3种主要植被生产功能的年际变化及其驱动因子。结果表明: 玉米和水稻的单产呈弱上升趋势, 但年际间波动较大; 芦苇单产则呈显著上升趋势, 但年际间波动不大。气候因子是玉米和水稻产量年际间变化的主要驱动因子, 而人为因子(农业人口、灌溉和施肥)的作用不明显; 气候因子和人为因子(灌溉)均明显影响芦苇产量的年际变化。但驱动辽河三角洲3种主要植被(玉米、水稻和芦苇)生产功能年际波动的主导气候因子并不相同, 分别是年日照数、年降水量和年蒸发量。
汲玉河, 周广胜 . 辽河三角洲植被生产功能的年际变化及其驱动 因子分析[J]. 植物生态学报, 2010 , 34(7) : 792 -799 . DOI: 10.3773/j.issn.1005-264x.2010.07.004
Aims Our objectives were to illustrate inter-annual change of the productivity of three main vegetation types in the Liaohe Delta and to discover the driving factors resulting in the change of productivity.
Methods Principal component analysis, Pearson correlation analysis and partial correlation analysis were applied, based on data for 14-year yield of maize (Zea mays) and rice (Oryza sativa), 42-year productivity of common reed (Phragmites australis), and data on climatic factors, agricultural population, irrigation area and fertilizer use in the Liaohe Delta.
Important findings A slight increased yield of rice and maize was shown, but with obvious inter-annual fluctuation. However, a large increased yield of common reed was shown, but with slight inter-annual fluctuation. Climatic factors played an important role as the key factors for the inter-annual fluctuation of yield of maize and rice, while human factors (agricultural population, irrigation and fertilization) played a relatively small role. Both climatic factors and human factors (irrigation) played an important role in the inter-annual fluctuation of yield of common reed. Nevertheless, the three dominant vegetation types had different driving factors for their fluctuating yield. Annual hours of sunshine, annual precipitation and annual evaporation were identified as the mainly driving factors for the fluctuating yield of maize, rice and common reed, respectively.
Key words： climatic change; grain yield; Liaohe Delta; productivity; vegetation
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