【Objective】 The estimation model based on spectrum of copper(Cu), zinc(Zn) in Armeniaca vulgaris ‘Luntaibaixing' leaves can provide technical methods for the monitoring and diagnosis of Armeniaca vulgaris ‘Luntaibaixing' body micronutrients. 【Method】 An UniSpec-SC spectrometer was operated to measure spectral reflectance under different nutritional status in different phenological periods of fruit development. Through the analysis of foliar Cu, Zn element concentration in different phenological periods and correlation between spectral reflectance Rλand its first derivative f'(Rλ), spectral sensitive indicator wavelength can be filtered out and the foliar Cu, Zn element concentrations spectrum estimation model in different phenological periods of fruit development can be established by a linear regression model. 【Result】 The results showed the spectral sensitive wavelengths of foliar Cu element in fruit setting period were358 nm and 463 nm, 605 nm and 871 nm in fruit core-hardening period, 365 nm and 818 nm in maturity period and 472 nm and 860 nm in post-harvest period. However, the spectral sensitive wavelengths of Zn element were 983 nm and 1 071 nm, 480 nm and 764 nm, 340 nm and 454 nm, 437 nm and 438 nm.The Cu element and Zn element concentration of A. vulgaris ‘Luntaibaixing' leaves were the most relevant to the first derivative f'(Rλ) of its spectrum reflectance, whose linear spectrum estimation model fitting degree was the highest and reached to a most significant level(P0.01). 【Conclusion】 It indicated that the different spectral sensitivity wavelength existed at different phenological periods of fruit development. The first derivative f'(Rλ) of spectral reflectance can be applied as independent variables to establish spectrum estimation model for its foliar Cu, Zn element concentration in different phenological periods of fruit development by linear model.

Aimed at providing technology for a rapid nutrition diagnosis system of micronutrients in Armeniaca vulgaris cv. Luntaibaixing, we established an element concentration estimation model for its foliar ferrum (Fe) and manganese (Mn) concentration based on spectrum analysis. The foliar spectrum reflectance at various phenological periods of fruit development under different soil fertility conditions was measured by Unispec-SC spectrometer. By analyzing the correlation of foliar Fe, Mn concentration at various phenological periods of fruit development, the spectrum reflectance Rλ and its first-order differential f' (Rλ), we filtered out its sensitive bands. And we established an element concentration estimation model for its foliar Fe and Mn at various phenological periods of fruit development with the linear regression model. The results showed that the spectral sensitive bands of foliar Fe in fruit setting period were 873 and 874 nm, 375 and 437 nm in fruit core-hardening period, 836 and 837 nm in maturity period and 325 and 1 054 nm in post-harvest period. However, the spectral sensitive bands of Mn were 913 and 1 129 nm, 425 and 970 nm, 390 and 466 nm, 423 and 424 nm, respectively. The Fe and Mn concentration of A. vulgaris cv. Luntaibaixing leaves were the most relevant to the first-order differential f' (RD) of its spectrum reflectance, whose linear spectrum estimation model fitting degree was the highest and reached to a significant or highly significant level. It showed that the spectral sensitive bands of Fe and Mn element varied with different phenological periods of fruit development. The spectrum estimation models for its foliar Fe and Mn concentration could be established with linear model according to its first-order differential f' (Rλ).

【Objective】Spectral sensitive bands and models used for estimating foliar NPK content were explored by analyzing correlation between foliar nitrogen(N) content,phosphorus(P) content,potassium(K) content and leaf spectral reflectance of Armeniaca vulgaris ' Luntaibaixing' at various phenological stages of fruit development under diverse NPK fertilization levels to provide approach for developing effective,timely and nondestructive nutrition diagnosis.【Method】Based on "3414" fertilizer effect field experiments,using correlation analysis and regression analysis.【Result】The spectral sensitive bands of foliar N,P,and K element were different in fruit enlargement stage,fruit hard core stage,fruit coloring stage and fruit maturity stage of A.vulgaris ' Luntaibaixing'.The spectral sensitive bands of foliar N element at four phenological stages of fruit development were 564 -664,499 -574 and 735 - 1067,310 - 1031,310 -419 and 518 -606 nm respectively.The spectral sensitive bands of foliar P element at four phenological stages of fruit development were 424 -656,519 -652,511 -617 and 512 -610 nm respectively.The spectral sensitive bands of foliar K element at four phenological stages of fruit development were 425 -701 and 721 -1113,475 - 733,500 - 721,539 - 673 and 719 -1058 nm respectively.The relation of power function and exponential function existed between the foliar NPK content and the leaf spectral reflectance or its derived variables at four phenological stages of A.vulgaris ' Luntaibaixing' fruit development.【Conclusion】The spectral sensitive bands of N,P and K element were not the same at various phenological stages of A.vulgaris ' Luntaibaixing' fruit development.The models for estimating foliar NPK content of A.vulgaris ' Luntaibaixing' were able to be established with power function or exponential function according to spectral reflectance of the sensitive bands or its derived variables.

【Objective】By measuring spatio-temporal window size of the saturation photosynthetic active radiation(PAR) at different growth stages of winter wheat in intercropping alley of Armeniaca vulgaris 'Luntaibaixing' at planting spacing of 3 m×6 m,this study aims at having in-depth understanding of light environment variation characteristics in intercropping alley in conformity with the requirements of intercropping growth and providing a scientific basis for better cultivating intercropping system of A.vulgaris 'Luntaibaixing' and winter wheat.【Method】Portable photosynthesis instrument Li-6400XT and linear quantum sensors instrument LI-191 were used respectively to measure the photosynthetic physiological parameters and canopy photosynthetic active radiation at different growth stages of winter wheat.【Result】Different growth stages of winter wheat light saturation point(LSP) were as follows: mature stage elongation stage grain filling stage.The spatio-temporal window size of winter wheat saturation photosynthetic active radiation in intercropping alley of A.vulgaris' Luntaibaixing' at planting spacing of 3 m×6 m with winter wheat were as follows: grain filling stage elongation stage mature stage.【Conclusion】At different growth stages of winter wheat,its light saturation point at grain filling stage reached the maximum.While in the intercropping system of A.vulgaris' Luntaibaixing' with winter wheat,the spatio-temporal window size of winter wheat saturation photosynthetic active radiation in intercropping alley came to the minimum.Therefore its light utilization capability could not function adequately,which was one of the main reasons for winter wheat yield decreasing.

【Objective】The purpose of the research was to provide theoretical basis for high quality and high yield cultivation of Armeniaca vulgaris'luntaibaixing' under the condition of high air temperature,high illumination intensity,low air humidity and irrigation in arid oasis through the analysis of photosynthetic characteristics at various phenological stages of fruit development.【Method】Portable photosynthesis instrument,Li-6400XT,was used to measure the photosynthetic physiological parameters at fruit-set period,coloured period,fruit harvest period of A.vulgari'luntaibaixing'.【Result】The light compensation(LCP)points of A.vulgari'luntaibaixing' were between 29 and 124 μmol/(m2·s),and the light saturation points(LSP) were between 873 and 1 355 μmol/(m2·s) at various phenological stages of fruit development.The maximum net photosynthetic rate showed a rising trend with the fruit growth and development,but the diurnal changes of net photosynthetic rat were all two-peak pattern curves while the photosynthetic 'nap' phenomenon was presented in these curves.【Conclusion】As the leaves of A.vulgari 'luntaibaixing' gradually matured,the ability of using light increased synchronously.The ability of using light was the strongest at the harvested period.Under the condition of high air temperature,high illumination intensity,low air humidity,the photosynthetic 'nap' of A.vulgaris'luntaibaixing' was mainly influenced by stomatal factors.