| 摘要: |
| 【目的】探究气候因子对油松径向生长的影响机制，为在半干旱黄土区构建稳定、可持续的油松人工林生态系统提供依据。【方法】采集陕西吴起县典型油松(Pinus tabulaeformis)人工林样地平均木的胸径和根茎处的圆盘样本，并从吴起县气象站获取当地1970-2009年的降水量和气温资料，利用树轮年代学和年轮气候学的相关方法，研究该地区气候因子对油松径向生长的影响机制。【结果】(1)生长季前降水量和生长季气温是影响研究区油松人工林生长及稳定性的关键限制性因子，且气温主要通过影响油松林土壤水分条件来影响年轮宽窄；(2)油松径向生长与前一年雨季中后期(8-10月)和当年1月降水量，尤其是当月＞10 mm的有效降水量呈显著正相关(P＜0.05)，而对于当年3月，只与＞10 mm的有效降水总量显著相关(P＜0.05)；(3)油松径向生长与前一年9月及当年5，8月平均气温呈显著负相关(P＜0.05)，与当年4月的月平均最低气温呈显著正相关(P＜0.05)。【结论】陕北黄土区吴起县油松人工林对气候因子的敏感期为前一年生长季后期(8-10月)和当年生长季初期(4-5月)。 |
| 关键词: 油松人工林 气候因子 径向生长 年轮 陕北黄土区 |
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| 基金项目:国家林业公益性行业科研项目“黄土丘陵严重侵蚀区植被恢复和重建技术研究”(201104002-2) |
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| Influence of climate factors on radial growth of Pinus tabulaeformis in loess area of Northern Shaanxi |
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LIANG Fei-fan,ZHU Qing-ke,WANG Lu-lu,et al
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| Abstract: |
| 【Objective】This paper researched the influence mechanism of climate factors on radial growth of Pinus tabulaeformis to provide basis for building P.tabulaeformis artificial forest with high stability and sustainability in semi-arid loess area.【Method】Two average trees were chosen from each standard plot in typical P.tabulaeformis artificial forests in Wuqi,Shaanxi to collect tree ring width samples at breast height and roots of these trees.The local precipitation and temperature data during 1970-2009 were collected from Wuqi weather station.Then dendrochronology and dendroclimatology related methods were used to investigate the influence of climate factors on the radial growth of P.tabulaeformis.【Result】(1) Precipitation before the growing season and temperature in the growing season were the key factors for the radial growth and stability of P.tabulaeformis artificial forest in the study area.Temperature affected the tree-ring width indirectly by influencing the soil moisture.(2)The radial growth positively related to the precipitation of the late rainy season (August－October) in the previous year,the precipitation of January and the effective precipitation (>10 mm) of March (P<0.05).(3) The radial growth was significantly and negatively related to the average temperature of September in the previous year and the average temperature of May and August (P<0.05),respectively.It was also positively related to the average low temperature of April (P<0.05).【Conclusion】Sensitive periods of P.tabulaeformis to climate factors in Wuqi,loess area of Northern Shaanxi Loess included the period after growing season (August－October) in the previous year and the beginning of growing season (April－May) in the current year. |
| Key words: Pinus tabulaeformis artificial forest climatic factors radial growth tree-ring loess area of Northern Shaanxi |
