| 摘要: |
| 【目的】 为黄土高原丘陵沟壑区梨枣根系吸水模型的建立提供关键参数。【方法】 通过分层分段挖掘法，对8年生梨枣人工林根区有效根长密度和根质量密度的空间分布进行研究。【结果】 在水平方向上，梨枣根长密度分布呈典型的负指数型，根质量密度分布呈抛物线型，吸收根根长和根质量密度主要集中在距树干0～60 cm水平距离内，分别占总吸收性根长和根质量密度的73.5% 和75%,其中最大有效根长和根质量密度均在0～30 cm水平距离,其有效根长和根质量密度分别占总吸收性根长和根质量密度的56.77% 和50.26%；在垂直方向上，梨枣根长密度和根质量密度分布均呈幂函数型，吸收根系根长和根质量密度主要分布在0～40 cm土层，其有效根长和根质量密度分别占总吸收性根长和根质量密度的79.1% 和78.88%，其中最大有效根长和根质量密度均分布在0～20 cm土层，其有效根长和根质量密度分别占总吸收性根长和根质量密度的61.62% 和59.47%。【结论】 非线性参数拟合分析表明：采用ＲD＝ｅa＋bX＋cZ的函数模型，能较好地模拟梨枣有效根长密度和有效根质量密度的空间分布状况，为梨枣根系空间分布状况的估计提供了参考。 |
| 关键词: 梨枣；有效根系 根系密度；根系的空间分布 |
| DOI： |
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| 基金项目:国家自然科学基金项目（30671721）；国家重大科技支撑计划项目（2007BAD88B05） |
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| Study on the distribution characteristics of effective root density in Ziziphus jujube cv.Lizao plantation |
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WEI Guo-liang,WANG You-ke,WANG De-xiang,LIN Yu-yang,LIN Yu-yang
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| Abstract: |
| 【Objective】 The study was done to provide key parameters for building root system water-absorbing model of Ziziphus jujube cv.Lizao growing in Hilly-gully Loess Plateau.【Method】 By means of digging methods from left to right and from up to down,the spatial density distributions of effective root in length and weight of the 8-year-old Ziziphus jujube cv.Lizao plantation were studied respectively.【Result】 The distribution of Ziziphus jujube cv.Lizao root length density presented a typical negative exponential type and the distribution of Ziziphus jujube cv.Lizao root weight density presented a typical parabola model.The absorbing root densities of length and weight both concentrated in the 0-60 cm soil layer,and the former accounted for 73.5% of the total absorbing root length density and the latter 75% of the total absorbing root weight density.Among them,the maximum density of effective root length and weight concentrated in the 0-30 cm soil layer,and the effective length density was 56.77% of the total absorbing root length density and the effective weight density was 50.26% of the total absorbing root weight density.In the vertical direction,the distribution of Ziziphus jujube cv.Lizao root length and weight density presented a power Ziziphus jujube cv.Lizao root weight density presented a typical parabola model.The density of absorbing roots length and weight concentrated in the 0-40 cm soil layer,the former accounted for 79.1% of the total absorbing root length density and the latter 78.88% of the total absorbing root weight density.Among them,the maximum effective root density of length and weight concentrated in the 0-20 cm soil layer,and the effective root length density was 61.62% of the total absorbing root length density and the effective root weight density 59.47% of the total absorbing root weight density.【Conclusion】 Regression estimate of non-linear parameter showed that model whose equation is RD＝ea＋bX＋cZ is a good way for simulating the spatial distributions of the effective root length and weight density of Ziziphus jujube |
| Key words: Ziziphus jujube cv.Lizao effective root root density spatial distribution of root |
