There are two kinds of theoretical defects export in the diagnosis and recommendationintegrated system (DRIS): the distribution of nutrient elements ratios with two normaldistribution displays an abnormal distribution...There are two kinds of theoretical defects export in the diagnosis and recommendationintegrated system (DRIS): the distribution of nutrient elements ratios with two normaldistribution displays an abnormal distribution of positive skewness; there is a blinddiagnostic area by DRIS on the occasion of the nutrient elements with equal ratios butwithout equal quantity. In the light of the quadratic form theory of multidimensionalnormal distribution and the view of balance of equal probability, the balance diagnosisand recommendation integrated system (BDRIS) was developed in this paper, which issuperior to DRIS and its diagnosis method is unified to critical value diagnosis. Whenthe correlation matrix of nutrient elements R=I(identity matrix), i.e., the effects ofelements antagonism is disregarded, BDRIS will be simplified into the critical valuediagnosis. In addition, the diagnosis program written in SAS language was also providedin this paper.展开更多
Teak （Tectona grandis L.f.） is widely planted in the world due to its high market demand, economic, ecological and social value. Its plantations have mostly been established and expanded into sites that are acidic t...Teak （Tectona grandis L.f.） is widely planted in the world due to its high market demand, economic, ecological and social value. Its plantations have mostly been established and expanded into sites that are acidic to severely acidic in southern China. But, there are no available and specific evidence-based nutrient management techniques. To better recognize and understand the relationship between teak tree growth and nutrient content in the foliage and soil and establish nutrient norms are critical to optimally manage these young plantations. We studied the foliar nutrient and soil chemistry in 19 representative teak plantations aged 5-8 years. Regression analysis indicated that the mean annual increment of teak volume was linearly and positively correlated with foliar N, Ca, Fe and B concentrations, with soil base saturation percentage, available P and Zn concentrations, and negatively correlated with soil Al concentration. Only if the Ca and Mg contents in soil were enhanced, could the increase in soil base saturation percentage benefit teak growth. A revised classification of low-and high-yielding stands was established by using a sorting method of principal components over 6 foliar macro and 8 micro elements in a Diagnosis and Recommendation Integrated System （DRIS）. Specific DRIS norms for teak plantations in acid soils were derived. The nutrient balance of N, P, K Ca, Mg, Zn, B with Fe or A1, Ca with Mg, and Fe with AI provided a key to promote the growth of teak in acid soils. Meanwhile, soil Zn was also found as a primary trace element that affected teak growth in this study.展开更多
文摘There are two kinds of theoretical defects export in the diagnosis and recommendationintegrated system (DRIS): the distribution of nutrient elements ratios with two normaldistribution displays an abnormal distribution of positive skewness; there is a blinddiagnostic area by DRIS on the occasion of the nutrient elements with equal ratios butwithout equal quantity. In the light of the quadratic form theory of multidimensionalnormal distribution and the view of balance of equal probability, the balance diagnosisand recommendation integrated system (BDRIS) was developed in this paper, which issuperior to DRIS and its diagnosis method is unified to critical value diagnosis. Whenthe correlation matrix of nutrient elements R=I(identity matrix), i.e., the effects ofelements antagonism is disregarded, BDRIS will be simplified into the critical valuediagnosis. In addition, the diagnosis program written in SAS language was also providedin this paper.
基金funded by the research and demonstration project of teak cultivation of the Chinese Ministry of Science and Technology(2012BAD21B01)
文摘Teak （Tectona grandis L.f.） is widely planted in the world due to its high market demand, economic, ecological and social value. Its plantations have mostly been established and expanded into sites that are acidic to severely acidic in southern China. But, there are no available and specific evidence-based nutrient management techniques. To better recognize and understand the relationship between teak tree growth and nutrient content in the foliage and soil and establish nutrient norms are critical to optimally manage these young plantations. We studied the foliar nutrient and soil chemistry in 19 representative teak plantations aged 5-8 years. Regression analysis indicated that the mean annual increment of teak volume was linearly and positively correlated with foliar N, Ca, Fe and B concentrations, with soil base saturation percentage, available P and Zn concentrations, and negatively correlated with soil Al concentration. Only if the Ca and Mg contents in soil were enhanced, could the increase in soil base saturation percentage benefit teak growth. A revised classification of low-and high-yielding stands was established by using a sorting method of principal components over 6 foliar macro and 8 micro elements in a Diagnosis and Recommendation Integrated System （DRIS）. Specific DRIS norms for teak plantations in acid soils were derived. The nutrient balance of N, P, K Ca, Mg, Zn, B with Fe or A1, Ca with Mg, and Fe with AI provided a key to promote the growth of teak in acid soils. Meanwhile, soil Zn was also found as a primary trace element that affected teak growth in this study.
