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本文探讨毛竹的叶营养诊断,以指导竹林施肥。研究内容包括叶分析的正确采样方法,用传统的临界值法和近期发展起来的新方法——DRIS诊断毛竹肥料试验的营养状态。结果表明: 1.毛竹的孕笋中期是采样的最佳时期;二年生立竹中部枝叶是取样的理想部位;一个叶平均样品至少采自5个单株才能达到分析精度的要求。 2.不同立竹结构对临界浓度标准有影响,每亩立竹250株以上的竹林,N、P浓度临界值分别为2.6％和0.13％,理想值为2.8％和0.16％。密度稀疏或钩梢竹林,N浓度临界值和理想值为2.9％和3.1％。新竹产量与N、P浓度反应相一致。 3.DRIS诊断参数从三年新竹产量大于3500kg/亩的高产群计算出来。DRIS诊断使用N、P、K、Si四组叶分析资料,诊断结果与临界值法基本一致。DRIS法的好处在于可以对营养平衡状况和需求顺序作出判断。但是养分相对不足或过量也可能误诊。考虑到森林立地条件的不均一性,应该推荐两种方法同时并用。
This paper discusses bamboo leaf nutrition diagnosis, to guide bamboo fertilization. The research includes the correct sampling method for leaf analysis, and uses the traditional critical value method and the recent development of a new method - DRIS to diagnose the nutritional status of Phyllostachys pubescens fertilizer test. The results showed that: 1. The middle period of bamboo shoots was the best time for sampling. The middle part of bamboo was the ideal sampling place for two years. The average sample of one leaf was collected from at least 5 plants in order to achieve the accuracy of analysis. 2. Different bamboo stand structure impact on the critical concentration standards, per acre bamboo more than 250 bamboo forest, N, P concentration of critical values were 2.6% and 0.13%, respectively, the ideal value of 2.8% and 0.16%. Densities of sparse or hooked bamboo, N concentration threshold and the ideal value of 2.9% and 3.1%. Hsinchu yield and N, P concentration consistent response. 3.DRIS diagnostic parameters calculated from three years Hsinchu output greater than 3500kg / mu of high-yield group calculated. DRIS diagnosis using N, P, K, Si four leaf analysis data, the diagnostic results and the critical value method is basically the same. The benefits of the DRIS method lie in the ability to judge the nutritional balance and the order of needs. However, the relative lack of nutrients or excess may also be misdiagnosed. Taking into account the heterogeneity of forest site conditions, two methods should be recommended at the same time.