| 摘要: |
| 【目的】研究柴达木盆地白刺群落叶片的养分特征，分析土壤养分对叶片营养的影响规律，为白刺退化居群的保护提供依据。【方法】在青海柴达木盆地选择6个重要的唐古特白刺（Nitraria tangutorum）分布区域，采集区域中白刺叶片和0～15，15～30，30～45 cm土层土壤样品，测定白刺叶片营养元素和土壤养分含量，分析不同白刺居群间的叶片养分特征，并建立叶片养分与土壤养分含量的回归模型。【结果】6个区域白刺居群间叶片营养含量存在显著的空间变异性，其中叶片有机碳(C)、氮(N)、磷(P)和钾(K)含量分别为357.43～415.63，26.12～52.65，1.60～4.23和8.03～17.32 g/kg；C/N、C/P和N/P分别为7.68～13.49，95.33～218.98和12.44～17.84。叶片有机碳(C)含量与叶片N、P、K含量相关性均不显著，而叶片P、K含量与叶片N含量呈极显著正相关。叶片养分含量与纬度、经度和海拔相关性不显著。回归分析结果表明，白刺叶片养分含量与表层（0～15 cm）土壤养分含量相关性达显著水平，其中叶片N含量与表层土壤碱解N含量呈显著正相关， 叶片P含量与表层土壤全P含量呈显著负相关，叶片K含量分别与表层土壤全K、碱解N和土壤有效P含量显著相关。15～30 cm土层土壤全N、全P、碱解N和速效K含量仅对叶片P含量有显著影响。白刺叶片N、P、K含量与30~45 cm土层土壤养分含量无关。【结论】白刺居群中叶片N和P含量相对充足，K相对不足；表层土壤（0～15 cm）养分含量对白刺叶片养分含量有显著影响。 |
| 关键词: 叶片营养 空间变异 回归分析 白刺 柴达木盆地 |
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| 基金项目:林业公益性行业科研专项（200904033）；农业科技成果转化资金项目（2011GB24320010） |
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| Regression analysis on leaf and soil nutrients of different Nitraria tangutorum populations in Tsaidam Basin |
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QIU Quan,LI Ji-yue,WANG Jun-hui,et al
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| Abstract: |
| 【Objective】In this study,we investigated the leaf nutrient characteristics of different Nitraria tangutorum populations in Tsaidam Basin,and analyzed the effect of soil fertility on leaf nutrition,aiming to improve the protection of N.tangutorum.【Method】Ten Nitraria tangutorum populations in six important N.tangutorum distribution areas in Tsaidam Basin were selected to measure the nutrients in leaves of different Nitraria tangutorum populations and soil depths （0-15,15-30,and 30-45 cm） and investigate the differences in leaf nutrients of different N.tangutorum populations.Then the regression model for leaf and soil nutrients was established.【Result】(1) Contents of leaf nutrients of different N.tangutorum populations showed significant spatial variability.The ranges of leaf organic C,N,P and K contents were 357.43-415.63,26.12-52.65,1.60-4.23 and 8.03-17.32 g/kg,respectively,and the ratios of C/N,C/P and N/P were in the ranges of 7.68-13.49,95.33-218.98,and 12.44-17.84,respectively.(2) The relationship between leaf organic C and leaf N,P and K was not significant,whereas leaf N content had significant correlation with leaf P and K.(3) Leaf nutrients showed no significant correlation with latitude,longitude and altitude,but they had significant correlation with contents of soil nutrients.(4) Regression analysis results show that leaf nutrients of N.tangutorum had significant correlation with nutrients in surface soil (0-15 cm),among which leaf N content had significant positive correlation with hydrolysis soil N,leaf P had significant negative correlation with surface soil total P and leaf K showed significant correlation with surface soil total K,hydrolysis N,and available P.In addition,total N,total P,hydrolysis N and available K contents in deep soil (15-30 cm) had significant effects on leaf P only.However,leaf N,P and K contents are not correlated with nutrient contents in deep soil (30-45 cm).【Conclusion】Leaf N and P contents of Nitraria tangutorum populations in Tsaidam Basin were relatively sufficient,whereas leaf K content was insufficient.Nutrient contents in surface soil (0-15 cm) had significant effects on leaf nutrients. |
| Key words: leaf nutrients spatial variability and distribution regression analysis Nitraria tangutorum Tsaidam Basin |
