中华人民共和国国家林业局位于北京市东城区和平里东街18号 ，是主管林业工作的国务院直属机构。其前身是1949年10月1日成立的中华人民共和国中央人民政府林垦部。 根据《国务院关于机构设置的通知》（国发[2008]11号），设立国家林业局。 2018年3月，根据第十三届全国人民代表大会第一次会议批准的国务院机构改革方案，将国家林业局的森林、湿地等资源调查和确权登记管理职责整合，组建中华人民共和国自然资源部；将国家林业局的森林防火相关职责整合，组建中华人民共和国应急管理部；将中华人民共和国国家林业局的职责整合，组建国家林业和草原局，由中华人民共和国自然资源部管理；不再保留国家林业局。
[Objective]To explore the effects of different formula fertilization on the growth and physiological characteristics of seedlings from three Phellodendron chinense Schneid provenances,aimed at providing suitable provenance and fertilization schemes for the scientific application of P.chinense Schneid.[Method]One-year-old seedlings from three P.chinense Schneid provenances were used as experimental materials.A L27(313)orthogonal experimental design was adopted to conduct ratio fertilization experiments on the three provenances.Growth indicators(seedling height,ground diameter)and physiological characteristics(chlorophyll,soluble sugar,soluble protein,malondialdehyde(MDA),superoxide dismutase(SOD),nitrate reductase(NR),and glutamine synthetase(GS))were measured.Correlation analysis and the subordinate function fuzzy evaluation method were used for comprehensive evaluation.[Result]Compared with the control(CK),formula fertilization significantly promoted the growth of seedling height and ground diameter,and the chlorophyll content of leaves.It enhanced the levels of soluble sugar,soluble protein,and enzyme activities(SOD,NR,GS),and significantly reduced the content of malondialdehyde,indicating a clear effect in inhibiting lipid peroxidation.The comprehensive evaluation of the subordinate function showed that the worst overall performance among the three provenances was CK,with the Chongqing Jiangjin provenance exhibiting the best comprehensive performance under T6(N2P3K1)treatment,the Hubei Enshi provenance performing best under T4(N2P1K2)treatment,and the Hunan Xiangxi provenance excelling under T8(N3P2K1)treatment.[Conclusion]Reasonable nitrogen,phosphorus,and potassium formula fertilization can improve the physiological metabolism level of P.chinense Schneid seedlings and promote their growth and development.The study indicates that among three provenances,the Hubei Enshi provenance exhibits the best overall performance,making it the preferred choice for cultivation,followed by the Hunan Xiangxi and Chongqing Jiangjin provenances.Under the conditions of this experiment,the optimal nitrogen,phosphorus,and potassium application rates for Chongqing Jiangjin provenance in production are 6 g·plant-1 of urea,5 g·plant-1 of superphosphate,and 2 g·plant-1 of potassium chloride.For the Hubei Enshi provenance,the optimal rates are 6 g·plant-1 of urea,1 g·plant-1 of superphosphate,and 3 g·plant-1 of potassium chloride.For the Hunan Xiangxi provenance,the optimal rates are 8 g·plant-1 of urea,3 g·plant-1 of superphosphate,and 2 g·plant-1 of potassium chloride.
[Objective] ABA is a key hormone for drought stress in plants. Differential metabolites and their associated pathways of ABA-mediated dehydration response in the isolated branches of Salix matsudana were investigated by metabolomics analysis, which provided the basis for the response to drought stress in S. matsudana. [Methods] The authors investigated the differential response of the xylem metabolomes of the S. matsudana branches dehydrated to different water potentials after soaked in the sodium tungstate solution, an inhibitor of ABA synthesis, using the isolated branches of S. matsudana as materials. [Results] Compared with the deionized water-soaked non-dehydrated branches, in the dehydrated to the P50 water potential branches the endogenous ABA content was significantly increased by 425.032%, and content of the soluble sugars such as D-fructose was significantly increased along with the content of amino acids such as L-glutamic acid. When ABA synthesis inhibitor-soaked branches was compared to deionized water-soaked branches, the content of endogenous ABA was significantly decreased by 79.253%, and the content of the soluble sugars such as D-1, 5-defructose and amino acids such as phenylalanine were significantly reduced after soaked in the inhibitor of ABA synthesis. Plant hormone signal transduction, carotenoid biosynthesis and starch and sucrose metabolism pathways were the key pathways in the dehydrated response of S. matsudana branches. [Conclusion] In the S. matsudana branches after dehydration, the ABA content is increased significantly, mediating the polysaccharide hydrolysis process and other processes to reduce the osmotic potential in response to drought stress.
